巻号一覧
52 巻, 475 号
選択された号の論文の27件中1～27を表示しています
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幡中 憲治, 藤満 達朗, 渡辺 秀明1986 年 52 巻 475 号 p. 579-586
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリー強度・延性レベルの大きく異なるJIS S 35 CおよびSNCM439熱処理材の予き裂試験片を用いて,それらの低サイクル疲労き裂進展抵抗に非線形破壊力学的立場から検討を加えた.その結果,繰返しJ積分幅ΔJおよびひずみ拡大係数幅ΔKεはともに,片側面き裂,中央貫通き裂を問わず,き裂進展抵抗を支配する有効なパラメータとなり得ることおよびこれらによる疲労き裂進展速度の整理結果は材料の強度,延性レベルの相違に鈍感であることを示した.抄録全体を表示PDF形式でダウンロード (1017K) -
金 敏健, 山田 邦博, 国尾 武1986 年 52 巻 475 号 p. 587-592
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリー耐久限度における停留き裂の限界寸法と初期久陥を模した微小穴の限界寸法を比較検討した結果,限界小穴寸法は同平滑材の耐久限度レベルの高低を支配するいわゆる限界停留き裂寸法とは一致しないことがわかった.しかしながら,限度小穴寸法は,応力除去燃鈍によって残留応力を除去した疲労予き裂のうち,耐久限度レベルを低下させない予き裂の最大寸法とほぼ一致することが認められた.抄録全体を表示PDF形式でダウンロード (856K) -
兼城 英夫, 屋富祖 建樹1986 年 52 巻 475 号 p. 593-600
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリー大気中と真空中で疲労を受けた純銅の下部組織の観察を通して,真空中での長時間のき裂の発生・成長期間中における下部組織の発達を検討した.その結果,真空中では,バンド組織のセル組織化,バンド組織中の転位ループの微細化,ハシゴ状組織および表面直下の転位組織の発達等が促進されること,またハシゴ状組織は結晶学的なすべり方向が最大せん断応力方向と近い結晶粒内に形成されやすいことなどが明らかになった.抄録全体を表示PDF形式でダウンロード (1437K) -
山本 照美, 津村 利光1986 年 52 巻 475 号 p. 601-607
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリー滑らかな円形弾性充てん物のはめ込まれた無限板に引張りまたは圧縮荷重が働き,円孔縁の一部にすきまが発生する混合境界値問題を,接触圧力分布を級線形で表示し,接触領域を与えて,逆に荷重を求める方法により解析した.そして無限板と充てん物の剛性化,はめあいしろおよび荷重が,応分分布の接触領域に与える影響を明らかにした.抄録全体を表示PDF形式でダウンロード (702K) -
戸伏 壽昭, 大橋 義夫, 大沢 孝治1986 年 52 巻 475 号 p. 608-615
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリー薄肉円管に軸応力とねじり応力の組合わせを与え,直角に折れ曲がる応力経路およびそれと鏡像関係にある経路あるいはねじりの反転の繰返しについて,軟化セルロイドのクリープ変形挙動を調べた.材料は一定応力下のクリープ変形で硬化し,応力経路の折れ曲がりと応力反転の初期に軟化し,硬化は反転の繰返しで発達することを見出した.これらのクリープ変形挙動が粘・粘弾性理論によりかなりの精度で表示できることを確かめた.抄録全体を表示PDF形式でダウンロード (1110K) -
小林 謙一, 阿部 真一, 鵜戸口 英善1986 年 52 巻 475 号 p. 616-624
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリー本論文は高温構造物設計法の中でも重要課題の一つとされながら,これまであまり実験的検証がなされていなかった弾性追従現象を新たに開発した単軸モデル・弾性追従試験装置で実験を行い,各種提案式との比較・検討を試みたものである.その結果,単軸弾性追従現象と簡易非弾性解析法としてはNortonの定常クリープ則に基づいた弾・クリープ解析値が,実験値と比べるとやや消極的ながら,定性的,定量的にも最もすぐれていた.抄録全体を表示PDF形式でダウンロード (1063K) -
野田 直剛, 松永 泰弘1986 年 52 巻 475 号 p. 625-630
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリー本論文は,円形き裂を有する無限体の非定常熱応力の理論解析を行ったものである.こんとき,円形き裂表面の温度条件は熱吸収と熱交換がある一般的な場合とした.非定常温度場に対し厳密解を得ることは困難であるので,時間に対し階差法を用いることにより,空間変数に対し解析解を得る方法を用い精度よい解を得た.また,数値計算を実行し,応力,間口変位および応力拡大係数の時間変化を図示した.抄録全体を表示PDF形式でダウンロード (604K) -
和田 均, 高木 豊, 西村 融1986 年 52 巻 475 号 p. 631-637
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリー内部き裂を持つチャンネルの膜応力拡大係数をき裂長さ,ウエッブ幅とフランジ幅の比を種々変化させて系統的に計算した.膜応力拡大係数はHerrmannの混合要素を用いて得られたき裂先端要素の応力から,著者らが平面問題で用いた合力比定数法を適用して計算した.またかく構造問題に対する合力比定数法の有効性についても詳細に検討した.抄録全体を表示PDF形式でダウンロード (801K) -
菊池 正紀, 宮本 博, 平岡 聡1986 年 52 巻 475 号 p. 638-644
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリー三次元き裂進展をFEMで妥当にモデル化sるため節点移動法を適用した.まず,従来の節点反力解法による方法との比較を二次元問題について行いよく一致することを確かめた.次にCT試験片の弾性および弾塑性状態での三次元き裂進展解析を行った.き裂は,J積分のき裂縁に沿っての分布が一様にあんるようになるような形状に進展してゆくとの結論を得た.サイドグループ試験片でも同様の結果となり,得られたき裂形状は実験とよく対応した.抄録全体を表示PDF形式でダウンロード (893K) -
守時 一, 西村 信三1986 年 52 巻 475 号 p. 645-654
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーr値を考慮した異方性降伏曲面について移動硬化の導入法を定式化し,これをもとに第1報において提案した成長限界判定法を用いて,ひずみ履歴(折れ線ひずみ経路)の成形限界への影響を調べた.これらの解析値は実験的の傾向をよく示した.さらに近似解法による成形限度値は定量的にも解析値とよく一致し,この判定法は簡便さゆえに実用的である.しかも移動硬化の導入は実験値を説明する上で大きく効を奏するとはいえなかた.抄録全体を表示PDF形式でダウンロード (1233K) -
戸梶 惠郎, 安藤 善司, 長江 光司1986 年 52 巻 475 号 p. 655-662
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーCharacteristics of fatigue crack propagation have been investigated in a low carbon steel and a high tensile strength steel to evaluate the effect of sheet thickness. Crack propagation data are generated over a wide range of growth rates, from 10-8 to 10-3 mm/cycle, for load ratios of 0.05 and 0.70 at room temperature in laboratory air. Particular emphasis is placed on behaviour at near-threshold growth rates. Near-threshold fatigue crack propagation behaviour is found to show a marked sensitivity to sheet thickness, and near-threshold growth rates decrease and threshold values increase with increasing sheet thickness. Roughness- and oxide-induced crack closure are proposed as a mechanism for the effect of sheet thickness on near-threshold fatigue crack propagation. It is also shown that the requirement for specimen thickness recommended by ASTM, W/20≤B≤W/4, is not valid for near-threshold fatigue crack propagation.抄録全体を表示PDF形式でダウンロード (1243K) -
服部 敏雄, 坂田 荘司, 大西 紘夫1986 年 52 巻 475 号 p. 663-671
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーSlipping behavior and deformation of a disk/blade dovetail assembly are analysed using a finite element method, a program developed for these contact problems. To analyse the problems with high accuracy it is necessary to use an exact frictional coefficient. The frictional coefficient is obtained through a pull-bend combined loading test. The blade damping capacity of the disk/blade dovetail assembly is calculated taking into account the slipping behavior. The calculated results coincide well with those of experimental results. The fretting fatigue strength is also estimated based on the calculated results of stress distribution on the contact surface. Finally, these calculated results are confirmed by the measurement of dovetail slot stresses under actual operating loading conditions.抄録全体を表示PDF形式でダウンロード (1034K) -
岡本 潤一, 清水 真佐男1986 年 52 巻 475 号 p. 672-676
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーFatigue crack growth tests were preformed on austenitic stainless steel subjected to repeated thermal shocks using a specially designed test system for thermal shock fatigue, in which liquid air is sprayed onto the center of a disk-shaped specimen heated to about 200°C. The fatigue crack growth was found to occur while producing the striation on the fracture surface each time a thermal shock is applied. The crack growth characteristics in thermal shock fatigue can be well explained by the results of analysis of thermal stress intensity factor (SIF). The crack propagation rate da/dN achieves its maximum at the same crack length as in the curve giving the relationship between SIF and the crack length. The results of the observation have also been described on the initiation and propagation of small fatigue cracks at the notch root.抄録全体を表示PDF形式でダウンロード (674K) -
大好 直, 三浦 公久1986 年 52 巻 475 号 p. 677-680
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーAn experimental study of mechanical transverse impact on an elastic plate was made. The transient wave-forms are explained in consideration of the mechanical energy propagation velocity. The velocity depends on the wave propagation modes. To detect the higher mode waves, a tiny hard plastic bead launched by air pressure from a thin glass tube and a piezo-electronic effect sensor are used. A comparision between experimental energy arrival times and theoretical ones, shows that the way explaining the transient behaviors of an elastic plate, developed here, may be well viable.抄録全体を表示PDF形式でダウンロード (581K) -
山田 勝稔1986 年 52 巻 475 号 p. 681-689
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーA transient thermal stress problem is solved analytically for a U-shaped edge notch in a semi-infinite plate in which the straight and notch edges have a prescribed temperature. The transient thermal stress concentration factors are computed numerically for the U-shaped notches having a notch-depth/notch-radius of up to 20, and the results are shown in the form of tables and figures. The stress concentration factors of steady state, which correspond to those under compression, are compared with other results available and very good agreements are found between them.抄録全体を表示PDF形式でダウンロード (923K) -
芦田 文博, 野田 直剛1986 年 52 巻 475 号 p. 690-696
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーThe present paper is concerned with the three-dimensional transient thermal stress problem in a transversely isotropic finite circular cylinder subjected to an eccentric partial heat source on an end surface, and the convective heat losses into the surrounding medium from the surfaces. This problem is analyzed by means of the transversely isotropic potential function method to stresses. For numerical examples, the temperature and thermal stresses were calculated for a graphite which belongs under a transverse isotropy and compared with those of isotropy. The effects of the length of the circular cylinder on the temperature and thermal stresses were researched.抄録全体を表示PDF形式でダウンロード (767K) -
綿貫 啓一, 大滝 英征, 石川 義雄1986 年 52 巻 475 号 p. 697-704
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーThe higher accuracy and performance of machine elements are required, the disk liked internal gear are widely used--inverse Geneva gear, spline and so on. But the stress distribution and deformation when a load is applied to its boundary has hardly analyzed. Then, in this report the author has analyzed the stress distribution and deformation of the disk liked internal gear by using complex stress function. This method makes it possible to get any profile by using mapping function to express the machine elements, and to analyze their stress distribution and deformation correctly and easily by above stress function.抄録全体を表示PDF形式でダウンロード (747K) -
西田 安良, 進藤 裕英, 渥美 光1986 年 52 巻 475 号 p. 705-711
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーThis paper deals with the problem of diffraction of horizontally polarized shear waves of arbitrary profile by a running crack located at the interface of two-bonded dissimilar elastic solids. A set of moving coordinate systems attached at the center of the running crack and a new time parameter are employed to obtain the basic equations of motion for two dissimilar elastic half spaces. By the use of Laplace and Fourier transforms we reduce the problem to a pair of dual integral equations. The solution to the dual integral equations is expressed in terms of a pair of Fredholm integral equations of the second kind having the kernel of a finite integration. Dynamic stress intensity factor for an incident wave with a step function profile is obtained as a function of the speed of crack propagation, the angle of incidence, the material properties, and time, and is shown graphically.抄録全体を表示PDF形式でダウンロード (651K) -
野崎 英明, 進藤 裕英, 渥美 光1986 年 52 巻 475 号 p. 712-719
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーThis paper is concerned with the axisymmetric ealstodynamic response of a long cylinder with a pennyshaped crack under normal impact, which is bonded to an infinite medium with different elastic constants. The problem is reduced to that of solving a pair of dual integral equations in the Laplace transform domain. Using an integral transform technique, the dual integral equations are further reduced to a Fredholm integral equation of the second kind. The dynamic stress intensity factor is obtained numerically, and the effects of the geometrical configurations and the material properties of the composite material on the dynamic stress intensity factor are shown graphically. Two limiting cases in which the surface of the cylinder is stress free and is fixed are included.抄録全体を表示PDF形式でダウンロード (716K) -
大路 清嗣, 久保 司郎, 岩崎 昌彦1986 年 52 巻 475 号 p. 720-726
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーThe authors have pointed out previously that the modified J-integral, J', near a creep crack tip is extremely high under the small-scale-creep conditions. Also, the J'-values in the transient creep, in which hardening exceeds recovery, are much higher than those in the steady-state creep, where an equilibrium between hardening and recovery is attained. The interaction of these two effects may multiply the increase in the J'-values during the transient creep. This paper is concerned with finite element simulation of this combined effect. The Robinson's model was employed to account for the effect of hardening and recovery during creep. It was found that the small-scale-creep effect was predominantly responsible for the increase in the J'-values during the initial part of loading time. The behavior of J' was explained in terms of the sizes of the creep-dominated region and the steady-state creep region.抄録全体を表示PDF形式でダウンロード (825K) -
渡辺 勝彦, 畔上 秀幸1986 年 52 巻 475 号 p. 727-735
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーThe objective of this study is to propose a practical method to evaluate the fracture resistance of a stably growing crack by crack energy density and to verify it through applications of the method to actual stable crack growth problems. The contents of this report are as follows: (1) More refined investigation of the relationship obtained before between initial crack length, load-displacement curves and the crack energy density which holds until a crack starts to grow is shown by using two crack models. (2) A relationship between initial crack length, present crack length, load-displacement curves and the additional rate of crack energy density caused by crack extension which holds generally to a growing crack is derived by using the same crack models as in (1). (3) A method to evaluate the fracture resistance of a stably growing crack from load-displacement curves which can be easily obtained by experiments is proposed, based on the relations above.抄録全体を表示PDF形式でダウンロード (1031K) -
渡辺 勝彦, 畔上 秀幸, 平野 八州男1986 年 52 巻 475 号 p. 736-743
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーThe method proposed in the 1st Report for evaluating the fracture resistance of a stably growing crack by crack energy density is applied to the stable crack growth problems of thin plates, and its applicability and validity are confirmed. That is, the experiments of stable growth fractures of thin single-edge cracked specimens with different initial crack lengths under bending moment, and thin center cracked specimens also with different initial crack lengths under tensile force are carried out. The fracture resistances expressed by additional rates of crack energy density and crack energy density are evaluated, based on the results. When fracture modes are almost the same, fracture resistances have almost the same values regardless of initial crack lengths, and their values vary only corresponding to the change of fracture mode caused by crack extension. Also, the difference of specimen types has no remarkable influence on their values.抄録全体を表示PDF形式でダウンロード (1039K) -
坂 真澄, 田中 聡, 阿部 博之1986 年 52 巻 475 号 p. 744-751
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーCrack tip blunting and crack initiation subjected to mixed mode loading of Mode I and Mode II were examined under the plane strain condition with large scale yielding. Fracture toughness tests were performed for tension specimens with double-edge cracks inclined to the loading axis. Elastic-plastic finite element analysis, based on finite deformation theory, was also carried out in order to understand the development of the crack tip blunting and the plastic strain concentration in the vicinity of the crack tip due to the blunting. The generalized COD, δr, was newly introduced for a ductile crack under mixed mode loading. It was shown that δr dominates the deformation in the vicinity of the blunted crack tip, independently of the crack angle, so that δr is useful as a fracture parameter. It was verified that the critical values for the crack initiation of δr and of the plastic work done, W^^p, in the vicinity of the crack tip, were independent of crack angle, in contrast to the J-integral and the usual COD, δ.抄録全体を表示PDF形式でダウンロード (1348K) -
小瀬 弘和, 岩清水 幸夫1986 年 52 巻 475 号 p. 752-757
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーIt is shown that the spectrum analysis of ultrasonic transverse waves is a useful tool for the acousto-elastic measurement of the difference and directions of principal stresses. The stress distribution chosen for the experiment is that in a center-holled plate specimen under tension. Ultrasonic transverse waves are incident normal to the specimen, and spectrums of the echos are analyzed. The transducer commonly used for sending and receiving waves is rotated to find the direction of incident vibration for which the spectral amplitude vanishes at some frequency. Such transducer direction and frequency are measured not only in a stressed state but also in a reference state of the specimen, and used for the acousto-elastic law in a slightly orthotropic material to determine the directions and difference of the principal stresses. In this experiment, the polarization directions of transverse waves changes only a little by the stress, and the precise measurement of this is required in a further study.抄録全体を表示PDF形式でダウンロード (788K) -
徳田 正孝, 大野 信忠 /, Jan KRATOCHVIL1986 年 52 巻 475 号 p. 758-764
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーMany important features observed in the inelastic behaviour of polycrystalline materials are caused for by a non-uniformity of microstructure and changes during the deformation process. Using the slip theory, a simplified model of a polycrystal which incorporates non-uniformity is presented, and a set of compact and reliable inelastic constitutive equations are developed, on the basis of the model, in a rate-form. The equation can reproduce deformation history effects and rate effects at an elevated temperature observed in a set of systematic experiments, with reasonable accuracy.抄録全体を表示PDF形式でダウンロード (892K) -
渡部 修, 大坪 英臣1986 年 52 巻 475 号 p. 765-772
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーThis paper presents analysis of elastic stress and torsion buckling of U-shaped bellows using ring elements. The expansion joint is considered to be composed of the two toroidal sections and inner-connecting annular plates. The general thin shell theory is employed to derive strain-displacement relations of shells and plates, valid for any loadings. Numerical examples under internal pressure or axial loading are described and compared with the results of existing appropriate analysis. The fundamental aspects of torsional buckling, which have not been studied previously, will also be investigated.抄録全体を表示PDF形式でダウンロード (865K) -
浅野 直輝1986 年 52 巻 475 号 p. 773-780
発行日: 1986/03/25
公開日: 2008/02/21
ジャーナル フリーThis paper presents that an impact contact force can be expressed as the product series of penalty functions and subsidiary contact conditions having relative movement components between two bodies on a contact surface. A penalty function type of virtual work principle for various contact and separate states of two bodies is formulated by using the expression of the impact force. This principle is most effective for solving a general impact response of the alternation between contact and separation, and a stress wave propagation response of cracked structures with open and/or closed states on a cracked surface. This is because of both the use of the relative components and the relaxation of all the subsidiary conditions in this principle. A finite element method (FEM) based on this principle is applied to a two- dimensional analysis for longitudinal impact of two uniform rods. The mean value of impact forced by FEM results coincides well with the value from the theory of one-dimensional elastic stress wave propagation.抄録全体を表示PDF形式でダウンロード (939K)
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