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Kenji HATANAKA
1984 Volume 50 Issue 453 Pages
831-838
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Toshio YOSHINO, Hiroshi TOKITA
1984 Volume 50 Issue 453 Pages
839-846
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Hironobu NISHITANI, Nao-aki NODA
1984 Volume 50 Issue 453 Pages
847-854
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Yoshinobu TANIGAWA, Yoitiro TAKEUTI, Naotake NODA
1984 Volume 50 Issue 453 Pages
855-862
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Sei UEDA, Yasuhide SHINNDOU, Akira ATSUMI
1984 Volume 50 Issue 453 Pages
863-868
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Kouji HUKATU, Kouichiro KAWASHIMA, Masanobu ODA
1984 Volume 50 Issue 453 Pages
869-879
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Toshio JINGU, koji HISADA, Ichiro NAKAHARA, Shuro MACHIDA
1984 Volume 50 Issue 453 Pages
880-887
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Hiizu HYAKUTAKE, Hironobu NISHITANI
1984 Volume 50 Issue 453 Pages
888-893
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Katsuhiko WATANABE
1984 Volume 50 Issue 453 Pages
894-903
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Toshiro MIYOSHI, Yuichiro YOSHIDA, Masaki SHIRATORI
1984 Volume 50 Issue 453 Pages
904-911
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Kikuo KISHIMOTO, Masayoshi TACHIHARA, Shigeru AOKI, Masaru SAKATA
1984 Volume 50 Issue 453 Pages
912-919
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Masaru ZAKO, Toshiro MIYOSHI, Ken TSUJIMURA
1984 Volume 50 Issue 453 Pages
920-927
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Masayuki TOYA
1984 Volume 50 Issue 453 Pages
928-935
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Hitoshi DOKI, Noboru YAMAKI, Junji TANI, Kikuo OTOMO
1984 Volume 50 Issue 453 Pages
936-944
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Hidekazu FUKUOKA, Hiroki TODA, Kenji HIRAKAWA, Haruo SAKAMOTO, Hisao Y ...
1984 Volume 50 Issue 453 Pages
945-952
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Takashi MINAKUCHI, Kanae YOSHIMINE, Takashi KOIZUMI, Takanori HAGIWARA
1984 Volume 50 Issue 453 Pages
953-958
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Masahiro ICHIKAWA, Tohru TAKAMATSU
1984 Volume 50 Issue 453 Pages
959-965
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Initiation of stable crack growth under Mode II loading in center cracked sheet specimens of 2024-T3 aluminum alloy is investigated using the apparatus devised previously by the authors. This apparatus makes it possible to conduct Mode II testing on the specimen which has the same geometry as that for Mode I testing. It is shown that the stress intensity factor at initiation of stable crack growth, (K
i)
II, is constant independent of the specimen width W for W≥W
0 and decreases as W decreases for W<W
0, where W
0 is a certain specimen width. This tendency is quite similar to our previous result for Mode I loading. Finite element analysis is carried out in order to examine if J-integral is applicable. It is shown that the specimen width dependence of (K
i)
II is well interpreted by (j
i)
II=const criterion. This result is similar to Kitagawa et al's analysis for Mode I loading.
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Hiroomi HOMMA, Kenshi ITHO
1984 Volume 50 Issue 453 Pages
966-972
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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The experiments of repeated impacts with steel balls of 20mm in a diameter on the same spot of the plate specimen surface were preformed in order to clarify a mechanical parameter taking a dominant part for the erosion damage. The observation of the specimen surface was made every a few cycles to measure the number of impacts when a erosion-lip was removed, that if defined as a erosion life. The measurement of dynamic stress histories near the crater gave the useful information of applied pressure to the crater by the steel ball. The pressure was successfully used to explain the effect of the impact angle on the erosion life observed in the experiments. IT was concluded that the pressure is one of the important parameters which dominate the erosion damage.
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Masahiro JONO, Jiho SONG, Hideshi UCHIDA
1984 Volume 50 Issue 453 Pages
973-979
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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In order to study fatigue damage accumulation due to the understresses included in service loadings, repeated two- and three-step programmed loading tests were carried out on SUS410JI stainless steel and the cyclic plastic strain was monitored throughout the life. In addition to effects of the cycle ratio of overstress to understress and the tensile mean stress present in the understress cycle, their interaction effects on the behaivior of cyclic plastic strain and cumulative damage were investigated in detail. Based on analyses of experimental results, a critical modified S-N curve was proposed which could be obtained from repeated two-step loading tests on a particular condition and would be applicable to actual loadings as conservative life-estimation.
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Masaki MORISHITA, Yasuhide ASADA, Akiyoshi ISHIKAWA
1984 Volume 50 Issue 453 Pages
980-987
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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A series of creep-fatigue tests conducted with SUS304 stainless steel at 650°C in a very high vacuum environment of 0.1μPa were subjected to evaluation based on damage concept relating to an inelastic deformation behaviors of the material. In the model, a damage is separated into two components of time-independent and -dependent. An inelastic strain is separated into a time independent and -dependent inelastic strain parameter. Damage components are related to inelastic strain parameters to give damage rate equations in which material constants are determined from experiments.
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Masaaki KURODA, Kikuo KISHIMOTO, Shigeru AOKI, Masaru SAKATA
1984 Volume 50 Issue 453 Pages
988-995
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Simple formulas for the dynamic fracture mechanics parameters. of a three-point elastic or viscoelastic bend specimen are derived by means of the Timoshenko's beam theory. Numerical analysis is performed for a specimen of steel or PMMA impacted by a falling steel cylinder or sphere. The contact force between the specimen and impactor is estimated by applying the Hertz's theory to the local deformation near the contact point, and the fracture mechanics parameters are evaluated by the simple formulas. For the purpose of comparison, computations are also performed by using the formula which has been obtained previously using the Euler-Bernoulli's beam theory. A fracture test of PMMA beam was conducted and the dynamic strain intensity factor was measured by a strain gauge mounted near the crack-tip. It is found that the fracture mechanics parameters are overestimated if the effects of rotary inertia and transverse-shear deformation of specimen are neglected.
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Yasushi NIITSU, Kozo IKEGAMI
1984 Volume 50 Issue 453 Pages
996-1002
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Combined stress tests were performed on thin-wall tubes of austenite stainless steel SUS304 in 600°C. Plastic behaviors subsequent to pre-plastic strain and pre-creep strain were experimentally investigated under various loading conditions. Consequently the influence of pre-creep strain at low stress level on subsequent plastic behavior was nearly equal to that of pre-plastic strain, but the influence of pre-creep strain at higher stress level and that of large pre-creep strain were weaker than that of pre-plastic strain. Stress-strain relations in these experiments were compared and discussed with the results calculated by the equi-plastic-strain surfaces.
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Hideo KOBAYASHI, Hirokazu TSUJI, Keyung Dong PARK, Hajime NAKAZAWA
1984 Volume 50 Issue 453 Pages
1003-1010
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Fatigue crack growth characteristics and crack closure for an A 508-3 steel were investigated at elevated temperatures (150°C and 288°C). The results obtained are summarized as follows: (1) The occurrence of oxidation of crack surfaces at elevated temperatures can affect the formation of fretting oxide debris in fatigue crack growth and has an important role on the near-threshold characteristics. (2) It can be possible to exclude the contribution due to fretting oxide debris and oxidation at elevated temperature on the near-threshold characteristics by the selection of a moderate test temperature. In this case, the characteristic is controlled only by plasticity induced crack closure and becomes a structure- and enviroment-insensitive material constant.
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Satoshi NISHIJIMA, Saburo MATSUOKA, Etsuo TAKEUCHI, Michiya YUYAMA, Me ...
1984 Volume 50 Issue 453 Pages
1011-1018
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Axial fatigue property at room temperature was investigated for 15 types of current carbon steels, low alloy steels and some stainless steels designated in the Japanese Industrial Standard (JIS) and widely employed for machine structural use. 55 representative heats in total were selected from materials examined in the Fatigue Data Sheet at the National Research Institute for Metals. Cyclic softening or hardening behaviour, cyclic stress-strain relationship, Coffin-Manson relations, the deviation from the relation at higher number of cycles region, and correlations between low cycle properties and the high cycle properties in the Data Sheets were discussed.
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Chitoshi MASUDA, Satoshi NISHIJIMA, Takayuki ABE, Hideshi SUMIYOSHI
1984 Volume 50 Issue 453 Pages
1019-1025
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Morphology of surface damage and small cracks by the corrosion fatigue was studied for quenched and tempered carbon steel S45C and Cr-Mo steel SCM435 in a deionized water and 3%NaCl water environments under rotating bending at frequencies from 0.03 to 30 Hz. In saline water the fatigue strength of the two steels decreased monotonously with increasing number of cycles and testing time, while in the pure water a kind of temporal fatigue limit was observed for frequencies higher than 3 Hz. In the latter case fatigue crack was arrested by the closure effect of corrosion product for certain periods but this was diminished by dissolution after enough long test duration. A map of corrosion fatigue fracture mechanism was proposed based on the results of observation and analysis.
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Akihiko SUZUKI, Akio TSUCHIYA
1984 Volume 50 Issue 453 Pages
1026-1034
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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A modified fraction model is proposed to represent the inelastic behavior of metal. In the proposed model, the inelastic strain of each volume fraction is expressed by only one component which includes plastic and creep strain in a unified way. This is the different point from the conventional fraction model originally proposed by Besseling where the inelastic strain of each volume fraction is divided to the time independent plastic strain and the time dependent creep strain. The proposed model eliminates the ambiguity in the determination of creep parameters which exists in the conventional fraction model and all material parameters of the model can be determined by usual uniaxial tensile test of several strain rates. Several example calculations and comparison with the test data have revealed that the proposed model has the capability of representation of the plastic, creep and plastic creep interaction behavior of metals.
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Kohei TSUJI, Toshiaki HISADA, Hideo KITAGAWA
1984 Volume 50 Issue 453 Pages
1035-1041
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Irregular configuration of the corroded surface is taken as spatial stochastic process and two-dimensional filtered Poisson process is newly developed as a numerical model of corrosion. In the present model any corroded surface is interpreted as being made by the superposition of pits. This enables us to characterize any general corrosion quantitatively, which has been hardly achieved. The availability of the proposed method is demonstrated through the analyses of two corroded specimens and discussions are give in the light of the above interpretation. Also the sensitivity study is exemplified making use of the flexibility of the model, which yields the basis of prediction of the development of corrosion.
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Kazuo ISHIDA, Nobuyuki KOBAYASHI
1984 Volume 50 Issue 453 Pages
1042-1048
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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An effective method for calculating the nonlinear-rocking response of ground-supported unanchored cylindrical tanks to earthquakes was developed. In this method, tank wall and liquid content are replaced with a mass-spring system, and the nonlinearity associated with the partial uplift of bottom plates due to overturning moments is considered as the rotational spring of bi-linear type which is determined by a static uplift analysis of tank bottom. The reliability of the dynamic analysis was illustrated by computing resonance frequencies, response accelerations and rotation angles of tank models and by comparing them with the results of vibration tests. A seismic deign procedure for nonlinear rocking of tanks is proposed, in which the uplift height of bottom plates is calculated by dynamic rocking analysis and the corresponding radial stress of them is obtained by static analysis. And a rocking analysis of a full-sized tank was tried, too.
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Ken-ichi TAKAO, Hironobu NISHITANI
1984 Volume 50 Issue 453 Pages
1049-1053
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Push-pull fatigue tests with zero mean stress were carried out on commercial purity titanium sheet specimens, in order to investigate the crack initiation characteristics and notch sensitivity. Special attention was given to the starting point of fatigue cracking at the root of a notch with various sharpness, and fatigue processes were observed successively. The followings were obtained; (1) The crack initiation process is the one in which the definite regions whose dimensions are closely related to the grain size, turn gradually into free surfaces as a whole by the repetitions of slop. (2) No non-propagating crack is initiated even for a specimen with a notch root radius of 0.1 mm. (3) The material is notch insensitive for blunt notches, however, appreciably sensitive for sharp ones due to absence of non-propagating cracks, compared to 7:3 brass and mild steels.
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Hideharu FUKUNAGA, Koichi GODA
1984 Volume 50 Issue 453 Pages
1054-1061
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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The present paper deals with microstructures and segregations of silicon-carbide fiber reinforced copper-added aluminium and aluminium-added magnesium alloy composites, fabricated by squeeze casting, as well as refers to the effect of the microstructure on the tensile strength of composites. The results obtained as follows; (1) Microscopic examination showed the solute element rich layer of a semicircle surroundings was locally formed on fibers in the composites, whichever matrix alloy was used. The layer was identified to be a eutectic constitution by EPMA analysis. With the decrease of the percentage of alloying element, the layer decreases in thickness and area fraction, and finally, for the case of 1% copper-aluminium matrix, no copper-rich layer was detected. (2) The appearance of the layer decreases the tensile strength of composites because of its brittleness.
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Akira TSURUSAKI, Juhachi ODA
1984 Volume 50 Issue 453 Pages
1062-1068
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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The indirect tension test, so called splitting test, is one of simple and effective methods for the determination of the tensile strength of brittle materials. But the calculated tensile strength is not always valid, because of the deformation at loaded parts of cylindrical specimen, the fracture criterion applied and so on. In this paper, a new indirect tension test, of which the loaded parts of specimen are cut parallel to each other, is proposed. Furthermore, the Mohr criterion is applied as the fracture criterion of the test method. The effects of the load conditions and the material properties of brittle materials for this method are numerically analized by the FEM and experimentally by many experiments with the resin-mortar specimens. As the result of the analysis and experiments both, a method to estimate the accurate tensile strength of brittle materials was established by using the indirect tension test load and the compressive strength of the material.
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Eiji NAKAMACHI, R. Sowerby
1984 Volume 50 Issue 453 Pages
1069-1076
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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A Large Strain and large displacement analysis of axisymmetric elastic-plastic shell bodies by means of finite element method is developed. In this Updated Lagrangian formulation for a ring shell element, the first Kirchhoff-Love hypothesis and the plate thinning treatment are introduced. Two material models, both treated as an isotropic and elastic-plastic solid, are employed. These are J2F and J2D models, obeying plastic-potential flow law and deformation rule, respectively. The analysis was performed for a free bulging of circular plate. It is concluded that thicker plate under clamped condition promote the formation of a local neck near the peripherally edge. In other case, such as thicker plate under simply supported condition or thinner plate under any boundary condition, the localized neck occurred near the center point.
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Hironobu NISHITANI, Dai-heng CHEN
1984 Volume 50 Issue 453 Pages
1077-1082
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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This paper is concerned with an analysis of stress intensity factor for a partial semi-elliptic crack perpendicularly emanating from the surface of a shaft subjected to uniform tension. In the analysis, the influence of Poisson's ratio on stress intensity factor is considered. The analysis is based on the body force method. According to the results, the stress intensity factor is larger than that for a similar shape crack of a semi-infinite body, excepting the case where the both b/a and b/r are small. The effect of Poisson's ratio on the stress intensity factor of a shaft is more than that of a semi-infinite body.
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Hironobu NISHITANI, Dai-heng CHEN
1984 Volume 50 Issue 453 Pages
1083-1089
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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The local strain concentration plays an important roll in low cycle fatigue of plain specimens. It is controlled by the strain hardening and strain softening properties of materials. In this study, low cycle torsional fatigue tests of age-hardened, strain softening Al alloy and annealed, strain hardening Al alloy were carried out on plain specimens having the fine lines drawn on the surface by which local strain s were evaluated. The results obtained are summarized as follows: (1) The crack nucleation due to the strain concentration near the grain boundaries is one of the representative mechanisms of micro-crack initiation in both age-hardened and annealed Al alloys. (2) Since an age-hardened Al alloy is not necessarily as strain softening type in a macroscopic scale but is strain softening type in a microscopic slop, the tendency of strain concentration in any location is strong. (3) The relation between the number of cycles and the amount of slip in the location where it becomes a crack in the future depends on the strain hardening-softening properties of the two materials. However, the relations in slop band crack and grain boundary crack are similar in each material.
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Hironobu NISHITANI, Masahiro GOTO
1984 Volume 50 Issue 453 Pages
1090-1096
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Fatigue tests under axial loading of plain steel specimens with a crack were carried out under various stress ratios R (R=0-1.5). When the crack is comparatively large and the stress amplitude σ
a is small, the crack growth rate is nearly proportional to ΔK
4(ΔK: stress intensity factor range). When the crack is small and σ
a is large, the growth rate is nearly proportional to σ
a81(1: crack length). In both cases, the effect of stress ration appears as the changes in the proportional constants.
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Masachika NAITOH, Masashi DAIMARUYA
1984 Volume 50 Issue 453 Pages
1097-1103
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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The purpose of this paper is to examine not only qualitatively but also quantitatively the influence of a rise time of longitudinal impact on the propagation of elastic waves in a bar. The adequacy of application of the Love theory for the propagation of longitudinal elastic waves to this problem is discussed by means of the simultanuous measuring of both axial and radial strain waves at the same stations along a bar. Theoretical results based on the Love theory predicts that, as the rise time of impact velocity increases, the effect of lateral inertia on longitudinal waves decreases and rise time of impact velocity increases, the effect o f lateral inertia on longitudinal waved decreases and then the oscillatory wakes of it become negligibly small. Experimental results for a steel bar agreed well with the theoretical results. Moreover, as an example of application, the consideration of the experimental measurement of the dynamic yield stress by using the one dimentional stress bar was made.
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Hironobu NISHITANI, Takashi OGATA, Masahiro ENDO
1984 Volume 50 Issue 453 Pages
1104-1109
Published: May 25, 1984
Released on J-STAGE: February 21, 2008
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Rotating bending fatigue tests were carried out on four kinds of heat-treated 0.45% C steels A, B, C and D whose Vickers hardness numbers Hv are 180, 480 650 and 800, respectively. The fatigue processes of these materials were observed successively. The fatigue limit of materials A and B is proportional to Hv, while that of materials C and D is not, especially the fatigue limit of material D is smaller than that of material C. This phenomenon is explained according to the differences of fatigue processes of these materials.
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