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小川 武史, 中村 崇諒, 林 登美男
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一般に,はんだの力学特性はバルク材による引張試験により評価されている.しかし,実機はんだ接合部は微細であり,引張試験から得られた結果がそのまま適用できるか疑問視されている.本報告では,まず初めに局所的な力学特性評価法として期待されているインデンテーション法とこの手法を用いて応力-ひずみ曲線を推定する2圧子法の説明を行なう.次に,これらを用いて実機はんだ接合部であるBGA(Ball Grid Array)から試験片を作製し,力学特性を評価した例を示す.その結果,BGA試験片はバルク材よりも低強度であることがわかった.
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梅野 宜崇
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荒居 善雄, 尾笹 一成, Liang Yuan-Hua
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The location identification method of quantum dots (QDs) is described from view points of experiments which is nanoprobe elastic-indentation on photoluminescence (PL) of In_<0.5>Ga_<0.5>As/GaAs QDs and simulations. The large blue shifts in horizontal scan experiments, which were performed in a high vacuum, low temperature(10K) under an equal load, were non-linear for scan distance. The simulations are carried out based on finite element of axis symmetry and six-band strain Hamiltonian. We found the possibility that position of QDs could be decided by making the difference between scan experiment results and simulation results minimum. Consequently, most of QDs were observed the emission when these passed through near the edge of indenter, and it is found out that the luminescence was not observable under central part of indenter by comparison with a distribution of the valence band due to indentation.
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辻 知章, 松永 泰弘, 畑 俊明
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都井 裕, 高垣 昌和, 崔 大坤, 鄭 祐尚
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藤並 明徳, 松中 大介, 山本 昌裕, 尾方 成信, 渋谷 陽二, 有吉 秀穂
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In the present study, we introduce a strategy on computational technology of atomistic thin film designing which has been proceeding in collaboration project between Osaka University and Matsushita Electronic Industrial Co., Ltd. This project consists of three categories. Firstly, we explain a material screening method using ab initio calculations, taking the evaluation for oxide/polymer thin film interface as an example. Secondary, as a multi scale simulation for the thin film growth, we are developing a hybridized atomistic modeling method combined with molecular dynamics (MD) and kinetic Monte Carlo (KMC), which have quite different time scales. Finally, we intend to evaluate the structural reliability of interface using first principle calculations.
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久森 紀之
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酒井 信介, 泉 聡志, 原 祥太郎, ベストマテリア , 住友化学 , 千代田アドバンスト・ソリューションズ, アイテック , 石川島検査 ...
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井上 裕嗣
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岡崎 正和, 阪口 基己, 刑部 真和, 佐佐木 洋輔, 吉田 高広
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吉川 暢宏, 半谷 禎彦, 桑水 流理, 宇都宮 登雄, 北原 総一郎
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ダイカストにおける空洞欠陥の発生は避ける事が困難であり,製品の品質を著しく損なう可能性がある.製品としての信頼性を得るためには,空洞欠陥の発生位置や大きさを把握し,それらを制御することが必要となる.X線CTは非破壊で製品内部の空洞欠陥を観察可能なので,製品の品質検査ばかりでなく,鋳造法案策定の際にも威力を発揮する.そのため,今後そのニーズは益々高まると考えられる.本研究は3大学と1企業が連携し,それぞれのシーズを融合した研究を行い,X線CTを用いてダイカストの空洞欠陥対策や信頼性向上に寄与するものである.
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藤山 一成, 大道 武生, 來海 博央, 村岡 嵩士, 島 朋寛
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An activity on human resource development has been conducted in Meijo University under the METI's educational-industrial complex project for the development of core manufacturing engineers. The postgraduate course is organized by cross functional team from mechanical, electric/electronics and informatics engineering to build up the total manufacturing sense for robotics. From the viewpoint of strength of materials, FEM based learning of structural design of robots is planned and the method for concurrent and optimum material/structure decision making is presented.
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西川 出, 滝本 大樹
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大富 浩一
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藤岡 照高
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Computer Aided Engineering (CAE) systems based on material strength and structural mechanics have already been utilized in the engineering field of structural design, and are expanding their applications to material processing and manufacturing. In the field of heavy and power industries, theoretical backgrounds, analytical investigations and mockup tests together with experiences in actual usage of the components in service have been traditionally referred to for improving the quality and performance of the equipment. In other words, design and feed back of actual usage have been complimenting each other. From the view point of actual experiences, damage mechanisms (e.g. combustion gas corrosion, vibration, over heating, etc) which are difficult to describe in computer algorithm are frequently more important than those incorporated into the widely-used CAE systems. In this paper, some perspectives are described referring to the realistic engineering practices in maintenance and remaining life assessment of high temperature power components together with some expectations for future CAE systems.
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佐々木 直哉, 岩崎 富生, 寺崎 健
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We examine effective cooperation of simulation technique and experimental technique in this report. A molecular-dynamics technique for determining the adhesion strength of the interfaces between different materials has been developed. This technique evaluates the adhesion strength by calculating the adhesive fracture energy defined as the difference between the total potential energy of the material-connected state and that of the material-separated state. the adhesion strength determined by this technique agrees well with that measured by scratch testing And,crack propagation prediction by a macro scale model is introduced.. In this model, the fatigue life of solder is evaluated based on the damage that accumulates during crack propagation, and the crack paths are automatically calculated. Calculation mesh size is adjusted by this method so that a calculation result may agree with an experimental result.
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田中 誠一, 井伊谷 隆, 吉田 直哉
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In order to realize "quick provide better products for our Customers",the Power Train Prototype Engineering department is working on innovation in "prototype engineering" and to create information through prototype production". To put it concretely,that are simulation development on project and improvement the precision of simulation result to adopt RPT(Rapid Prototyping).Numerical simulation is one of the valuable way,but it is very important to use under the comparison between real and simulation result.This document outlines our activities of process simulation in production engineering.
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加藤 千幸
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Due to a rapid progress in computational power, roles of numerical predictions are, in general, becoming even greater in various engineering fields. This trend is expected to continue for the coming decades as well. However, this may not necessarily eliminate the needs for experimental measurements in the future. In this short presentation, we discuss the expected future roles of, and proper relations between experimental measurements and numerical simulations in the field of fluid flow analysis.
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湯原 哲夫
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Developments of novel design criteria with advanced research of strength are the basis of original structures and the foundation of industrial competitiveness. Our country is now one of top runners in the industries of energy and power plants, and our standards should be international one. Looking back the epoch-making codes in industrial fields, future trends of new codes and expectations for advanced research and developments are considered.
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小林 英男
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伊藤 義康
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知的財産とは、一般に特許、意匠、商標、著作などの人間の知的生産物に対する総称として使われることが多い。しかし、人間の知的生産物という観点からは、規格・標準類も同様に知的財産と言える。両者の大きな違いは、特許・著作に代表される知的財産は個人の保有権が保護されるのに対し、規格・標準は公的に認知されて利用できることが基本となる点にある。従来から、企業における研究開発の成果として、自事業防衛の観点から特許等の知的財産権の蓄積が重要であるとの認識は強い。一方、従来から規格・標準に関しては研究開発の成果としての認識は強くなく、従来から公的機関において共通基盤的な技術標準の策定が進められてきた。しかしながら、最近の市場のグローバル化は、戦略的な国際規格・国際標準の構築を必要としている。すなわち、事業の核である製品・技術を他社から防衛するのが特許であり 、事業化を推進するのが規格・標準である。デファクト標準(競争原理に基づく業界標準)は新規事業の立ち上げを推進し、デジュール標準(共通基盤的な技術標準)は事業の継続的発展を支援するものである。したがって、これからの研究開発においては、広義の知的財産として特許と共に、規格・標準化をも念頭に置いて戦略的に進める必要がある。本報では、各種の高温機器を対象に進められてきた耐熱性試験の開発現状と、その規格・標準化についてまとめた。特に、先端技術分野であるガスタービンの耐熱・耐環境コーティング技術に注目し、そのデジュール標準(共通基盤的な技術標準)の動向を明らかにし、今後の耐熱試験方法の規格化について言及する。
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山田 知穂
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岸本 喜久雄
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東郷 敬一郎
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田代 光
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山田 敏博
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石本 裕保
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我国の石油精製・石油化学工業は昭和30年以降に急速に発展した。多くのプラントは建設後40〜50年を経過しており、その間各種の腐食損傷を経験し、対策を実施してきた。ここでは石油精製・石油化学プラントにて発生する可能性がある腐食損傷の種類と2,3の損傷解析例について紹介し、今後の課題について述べる。
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重留 祥一
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柴崎 敏和
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ここ10年、石油、石油化学プラントの、加熱管の金属温度として最大600℃から700℃の一般石油加熱炉、および900℃を超える高温加熱炉において見られた、加熱管の寿命に影響する現象を述べると伴に、その代表的加熱管余寿命予測法について紹介する。加熱管のトラブル現象として、酸化減肉、浸炭・メタルダスティング、クリープ損傷を取り上げる。
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井手口 禎郎
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四辻 美年
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田原 隆康
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中瀬 圭一, 五嶋 孝仁, 清水 理能, 扇 嘉哉, 中井 勇介
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In recent years, the solder junctions that is packaging on the circuit are increasing rapidly. In many cases, the solder junctions occur thermal fatigue fracture due to heat flux cycles of currents. Therefore, many papers is studied in solder junctions. But, there are few studies on investigate about fatigue crack growth behavior. So in this study, we assume that half space 63Sn37Pb solder has initial crack, and the stress intensity factors in a crack tip is analyzed, and the crack path, the propagation mode, and the fatigue life in solder is predicted due to thermal fatigue crack propagation.
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上田 馨, 五島 孝仁, 清水 理能, 石原 外美
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The stress intensity factors of a crack emanating from an inclusion in a half space are analyzed under rolling/sliding contact with frictional heat. The complex variable formulation of Muskhelishivili is used to reduce the problem to the simultaneous integral equations. These integral equations are solved numerically thus enabling the numerical calculation of the stress intensity factors. On the basis of these results, the location and direction of initial crack growth emanating from an inclusion are predicted numerically for the case of high carbon-chromium bearing steel. The initial crack growth direction is assumed to be determined by applying the maximum energy release rate criterion to oriented crack emanating from location of stress concentration at an inclusion. The effects of frictional coefficient, slide/roll ratio and depth of inclusion on the location and direction of initial crack growth are considered.
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古口 日出男, 浮須 和樹
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The 3DFEM of piezoelectric joints is presented. The influence of the angle of corner on the order of stress singularity in the case of Three-dimensional corner shape of having various angles, various piezoelectric joints angle and various piezoelectricity poled directions, is analyzed in this paper. The eigen equation determining the stress singular order and, the stress, displacement and electric displacement fields near the interface are deduced in details.
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熊谷 圭祐, 轟 章, 松崎 亮介
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For Unmanned Aerial Vehicles (UAV), "Morphing wing" is desired to improve the maneuverability and reduce the total weight of structures. Morphing wing enables the aircraft to change its standard performance. In this study, a new Partially-Flexible CFRP (PFC) is proposed for the material of morphing wing. The PFC consists of two kinds of matrices: high-stiffness matrix and low-stiffness matrix in a structure. Reinforced fiber continues in the whole structure, so damages of the PFC can be monitored by electrical resistance changes method. In this paper, a relationship of ratio of fiber broken and electrical resistance changes is shown. To investigate the performance of the PFC, cyclic bending tests is performed, and damages of PFC is evaluated by measuring electrical resistance changes. It is proved that the PFC with more than 10mm-long flexible part can maintain its stiffness and has the strength to apply actual structures.
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長谷部 裕一, 島村 佳伸, 東郷 敬一郎, 岩崎 篤, 轟 章
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高橋 航圭, 轟 章, 島村 佳伸, 岩崎 篤, 松崎 亮介
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The damage detection system of CFRP structures by making use of electrical resistance changes due to elevated temperature is performed. CFRP is heated up by applying electric currents through the electrodes mounted on the surface of the structure. When the delamination occurs, the electrical resistance change due to elevated temperature becomes different from that of the other intact parts. In this study, therefore, the electrical resistance changes are measured at the multiple segments on a CFRP beam simultaneously, and the damage is detected from the change of relative relationship between the measurements. A set of electrical resistance changes is related with each other by means of a response surface, which changes when delamination cracks occur. The similarity of the response surfaces is evaluated by F statistics. These damage detection systems are applied to detect a delamination in cross-plied CFRP beam and the delamination is successfully identified.
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市之川 豪士, 駒崎 慎一, 藤原 幹男, 幸野 豊
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In order to examine a possibility of hydrogen as a tracer for evaluating fatigue damage accumulation, the fatigue damaged carbon steels have been charged with hydrogen by cathodic electrolysis. The hydrogen-charged steels have been subjected to the TDS analysis after exposing them to atmosphere for 5 mm. In this study, the specimen of which the surfaces except the fatigue damaged one were coated with epoxy resin was subjected to the hydrogen-charging and the duration of exposure time was prolonged to be 30 mm for improving the detection sensitivity. Experimental results revealed that the temperature of hydrogen evolution peak, which appeared at around 85-90℃ during the TDS analysis irrespective of the degree of fatigue damage, increased by 15℃ when compared with the temperature measured by the conventional method. In addition, the differences between the amount of desorbed hydrogen, C_H, of the virgin steel and those of the fatigue damaged specimens were slightly pronounced by the above modification.
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鈴木 洋光, 東郷 敬一郎, 島村 佳伸, 中山 元, 平野 隆
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Irwan HERMAN, 佐藤 康元, 飯井 俊行
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In this study, the efficiency of hoop-wrapping approach as the countermeasure for pipe strength decrease due to local wall-thinning is studied. For that purpose, the effects of the flaw length, the flaw depth and the hoop-wrapped material thickness on the burst pressure of the steel-lined hoop-wrapped cylinder are investigated by using finite element analysis(FEA).
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鴻巣 眞二, 福田 晋一
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There are numerous cases in which the external surfaces of cylinders such as towers, piping and storage tanks are partially corroded under their insulation. Therefore, load capacity of an internally pressurized cylinder with a local thin area subjected to external bending moment is needed to know. In this paper, the plastic collapse criterion of a cylinder with local thin area based on the reference stress is proposed. This method is validated by comparison with the experimental and FEA results.
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佐野 浩司, 川村 隆介, 大多尾 義弘, 樋口 理宏, 谷川 義信
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This study is concerned with theoretical analysis of magneto-thermoelastic behavior of a conducting infinite cylinder of a rectangular cross-section which is placed in uniform magnetic field whose intensity varies sinusoidally in time. Eddy current field induced in the conducting rectangular cylinder is analytically derived by making use of the theory of quasi-stationary current. Analytical solution of two-dimensional temperature change in the cylinder due to the eddy current loss is derived by means of the Green function method. Deformations and stresses in plane strain state of the rectangular cylinder subjected to the associated eddy current loss and Lorentz force are derived under the condition of traction-free on the boundary surfaces by making use of Airy stress function. Numerical calculations are carried out and mechanical behaviors of thermal stresses and magnetic stress are made cleared.
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林 直樹, 長谷川 久夫
原稿種別: 本文
セッションID: P012
発行日: 2007/10/24
公開日: 2017/06/19
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This paper deals with the stress singularity problem of an infinite elastic thick plate subjected a torsional displacement by a circular rigid cylinder embedded in the plate. It is assumed that the end face of the cylinder is bonded to the bottom plane of the circular hole of the plate, and the circumferential surfaces are free from surface forces. A body force distribution method is used to investigate the problem. The stress distributions on the interface and the order of stress singularity are shown.
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近藤 健太, 芦田 文博, 坂田 誠一郎
原稿種別: 本文
セッションID: P013
発行日: 2007/10/24
公開日: 2017/06/19
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This paper discuss a stress control problem in a three-layered composite disk consisting of a transversely isotropic structural layer onto which piezoelectric sensor and actuator layers of crystal 6mm are perfectly bounded. It is considered that some electrodes are arranged concentrically on the upper surface of the actuator layer. When an unknown heating temperature distribution acts on the bottom surface of the disk, the electric potential distribution is assumed to be measured on the upper surface of the sensor layer. Then, the maximum thermal stress induced in the structural layer can be controlled by applying an appropriate voltage to each electrode. The voltages applied to electrodes are determined by optimization so that the maximum thermal stress in the structural layer is minimized subject to constrains on the stresses in the piezoelectric layers. Finally, numerical results are shown in tables.
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田村 雄一, 森本 卓也, 河村 隆介, 大多尾 義弘, 谷川 義信
原稿種別: 本文
セッションID: P014
発行日: 2007/10/24
公開日: 2017/06/19
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Secondary buckling behavior of functionally graded thin strips subjected to biaxial compression is studied. Young's modulus and shear modulus of elasticity of the strip are dependent on the coordinate variable in the thickness direction of the strip. First we briefly present the governing equations of functionally graded thin strips. Next we make the postbuckling analysis and derive the exact deflection and stress function in Euler buckling state. These solutions allow us to analyze secondary buckling phenomena. Finally, we study the secondary buckling behavior by use of the Galerkin method. Effects of the inhomogeneity of elastic moduli on the secondary buckling behavior of the strips are discussed.
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上田 整, 西村 直樹, 近藤 宏憲
原稿種別: 本文
セッションID: P015
発行日: 2007/10/24
公開日: 2017/06/19
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Transient response of a penny-shaped crack in a plate of a functionally graded piezoelectric material (FGPM) is studied under thermal shock loading conditions. It is assumed that the thermoelectroelastic properties of the strip vary continuously along the thickness of the strip, and that the crack faces are completely insulated. By using both the Laplace and Hankel transforms, the thermal and electromechanical problems are reduced to a singular integral equation and a system of singular integral equations which are solved numerically. The intensity factors versus time for various crack size, crack position and the material nonhomogeneity are obtained.
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上田 整, 谷 吉郎
原稿種別: 本文
セッションID: P016
発行日: 2007/10/24
公開日: 2017/06/19
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This work concerned with the thermoelectromechanical fracture behavior of two coplanar cracks in a piezoelectric material strip under a uniform heat flow far away from the crack region flie crack faces are supposed to be insulated thermally and electrically. By using the Fourier transform, the thermal and electromechanical problems are reduced to singular integral equations, respectively, which are solved numerically. Numerical calculations are carried out, and detailed results are presented to illustrate the influence of the crack location and length on the thermal stress intensity factors.
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大多尾 義弘, 深田 高史
原稿種別: 本文
セッションID: P018
発行日: 2007/10/24
公開日: 2017/06/19
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This paper is concerned with theoretical treatment of thermoelastic involving a laminated composite hollow cylinder with an interlayer of functionally graded material. The thermal and thermoelastic constants of the interlayer are expressed as power function of the radial coordinate variable. We obtain the exact solution for the one-dimensional temperature change, and thermal stresses of a hollow cylinder under the state of plane strain. Some numerical results for the temperature change, the displacement and the stress distributions are shown.
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山本 真司, 來海 博央, 白木原 香織, 藤田 雄一
原稿種別: 本文
セッションID: P019
発行日: 2007/10/24
公開日: 2017/06/19
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