Materials Science Research International最新文献_第3页

Reliability of Strength and Long-Term Life for Ceramics/Metal Jointing Parts under Neutron Irradiation( Reliability Engineering in Materials and Structures) 中子辐照下陶瓷/金属连接件强度和长期寿命可靠性(材料与结构可靠性工程)

Materials Science Research International Pub Date : 2002-09-15 DOI: 10.2472/JSMS.51.9APPENDIX_101

N. Okabe, Xia Zhu, Manabu Takahashi, M. Nakahashi

{"title":"Reliability of Strength and Long-Term Life for Ceramics/Metal Jointing Parts under Neutron Irradiation( Reliability Engineering in Materials and Structures)","authors":"N. Okabe, Xia Zhu, Manabu Takahashi, M. Nakahashi","doi":"10.2472/JSMS.51.9APPENDIX_101","DOIUrl":"https://doi.org/10.2472/JSMS.51.9APPENDIX_101","url":null,"abstract":"The ceramics/metal joints in the airtight seal parts for a neutron detector are studied on the reliability for strength and long-term life. Both functions of airtight and insulation are required for the airtight seal parts, which suffer a very bad influence from a viewpoint of long-term reliability as well as strength, because the residual stress is generated in these joints due to the difference of the thermal expansion coefficient between ceramics and metal. The ceramics subjected to neutron irradiation in-serve occurs in swelling (volume expansion) and decreases in strength. Moreover, the copper interlayer rises in yield stress and hardens with increasing the plastic deformation due to the swelling of ceramics, and so lowers in function for stress relaxation. As a result, not only the internal stress in ceramics increases with passing the time in service, but also the facture strength of ceramics lowers, and finally a delayed fracture occurs at the ceramic/metal joints in the airtight seal parts. Therefore, in our study, the residual stress has been analyzed by a simulation model using FEM, so that both mechanisms of the increment in internal stress as well as mechanical damage can be clarified for the ceramic/metal jointing parts subjected to the neutron irradiation over long-term. On the other hand, the strength verification against the ceramic/metal joints are performed through simulation model analyses as well as the virtual tensile tests for small mock up specimens. From a viewpoint of fracture mechanics, the reliability for fracture life as well as strength of the airtight seal parts is discussed statistically considering the scatter of strength for Si3N4.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115972087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Field Damage Data Analysis and Probabilistic Fatigue Life Assessment of Turbine Components( Reliability Engineering in Materials and Structures) 涡轮部件现场损伤数据分析与概率疲劳寿命评估(材料与结构可靠性工程)

Materials Science Research International Pub Date : 2002-09-15 DOI: 10.2472/JSMS.51.9APPENDIX_134

K. Fujiyama, Keisuke Takaki, Y. Nakatani, Y. Yoshioka, Y. Itoh

引用次数: 4

On Reliability Evaluation of a Diaphragm in a Light Touch Switch( Reliability Engineering in Materials and Structures) 轻触开关膜片可靠性评估(材料与结构可靠性工程)

Materials Science Research International Pub Date : 2002-09-15 DOI: 10.2472/JSMS.51.9APPENDIX_128

M. Zako, T. Kurashiki, S. Hanaki, H. Nakai, A. Ito, M. Fukuda

{"title":"On Reliability Evaluation of a Diaphragm in a Light Touch Switch( Reliability Engineering in Materials and Structures)","authors":"M. Zako, T. Kurashiki, S. Hanaki, H. Nakai, A. Ito, M. Fukuda","doi":"10.2472/JSMS.51.9APPENDIX_128","DOIUrl":"https://doi.org/10.2472/JSMS.51.9APPENDIX_128","url":null,"abstract":"Fatigue characteristics of a metal diaphragm in a light touch switch are evaluated with experimental approach considering cyclic load acting on it. The approach consumes much time and costs for evaluation. In previous paper, we have described that the mechanical properties of stainless steel have anisotropy and the fatigue characteristics must be discussed considering the large scatter of material properties induced by the anisotropy. Therefore, the purpose of this study is to establish a simple method to evaluate the reliability of diaphragms with the consideration of anisotropy. The proposed approach consists of three procedures. Firstly, residual stress after press forming is evaluated by finite element method (FEM), and response curves when the pushing load is applied on the diaphragm are also analyzed. And, the stress amplitude and the mean stress at every point on the diaphragm can be calculated. Secondly, the experimental database about S-N curve and Goodman diagram considering the effect of anisotropy have been prepared. Finally, the fatigue lives considering failure probabilities on the diaphragm can be estimated by comparison of Goodman diagram with numerical results. Obtained results revealed that the proposed approach is very useful for the reliability evaluation of the diaphragm.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115344111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Second-harmonic generation in thermally/electrically poled transparent BaTiO3 thin films prepared by dip-coating method 浸涂法制备热/电极化透明BaTiO3薄膜的二次谐波产生

Materials Science Research International Pub Date : 2002-06-15 DOI: 10.2472/JSMS.51.6APPENDIX_85

Iwao Sakaihara, Katsuhisa Tanaka, T. Wakasugi, R. Ota, Y. Yonesaki, K. Hirao

引用次数: 1

Fatigue Properties of Notched Aluminum Specimens after Hard Rolling 缺口铝试样硬轧后的疲劳性能

Materials Science Research International Pub Date : 2002-06-15 DOI: 10.2472/JSMS.51.6APPENDIX_53

X. Yue, S. Nishida, N. Hattori

引用次数: 2

Influence of Na2Si2O5 on the Hydration of C4AF with Various Surface Areas Na2Si2O5对不同表面积C4AF水化的影响

Materials Science Research International Pub Date : 2002-06-01 DOI: 10.2472/JSMS.51.6APPENDIX_64

Kwang-suk You, H. Fujimori, K. Ioku, S. Goto

引用次数: 1

Influence of Na2Si2O5 on the Hydration of Tetracalcium Aluminoferrite Na2Si2O5对铁铝四钙水化的影响

Materials Science Research International Pub Date : 2002-06-01 DOI: 10.2472/JSMS.51.6APPENDIX_60

Kwang-suk You, H. Fujimori, K. Ioku, S. Goto

引用次数: 1

X-Ray Study on Lattice Strain and Domain Switching Induced in Rhombohedral PZT by Poling and External Loading 极化和外载荷诱导菱形PZT晶格应变和畴切换的x射线研究

Materials Science Research International Pub Date : 2002-03-15 DOI: 10.2472/JSMS.51.3APPENDIX_26

K. Shirakihara, Keisuke Tanaka, Y. Akiniwa, Y. Sakaida, Hirokatsu Mukai

{"title":"X-Ray Study on Lattice Strain and Domain Switching Induced in Rhombohedral PZT by Poling and External Loading","authors":"K. Shirakihara, Keisuke Tanaka, Y. Akiniwa, Y. Sakaida, Hirokatsu Mukai","doi":"10.2472/JSMS.51.3APPENDIX_26","DOIUrl":"https://doi.org/10.2472/JSMS.51.3APPENDIX_26","url":null,"abstract":"The X-ray diffraction method was applied to measure the change of the lattice strain and domain switching in rhombohedral lead zirconate titanate (PZT) due to poling and external straining. The lattice strain was determined from the linear relation between the diffraction angle 2θ and sin2ψ (ψ is the angle between the normals of the specimen surface and of the diffraction plane). The lattice strain measured by X-rays is at most 15% of the macrostrain determined from the dimensional change due to poling. Domain switching caused a major part of the macrostrain. External loading induced domain switching and the lattice strain. The lattice strain induced by external loading was at most 25% of the applied strain. The amount of domain switching was evaluated by the change of the intensity ratio, I222/I222, of the 222 to 222 diffraction. The intensity ratio for the normal diffraction (ψ=0°) was decreased with increasing the applied strain, because the spontaneous polarization direction, the 222 direction, turned to the loading direction. The broadening of X-ray diffraction profiles obtained from the diffraction plane perpendicular to the poling direction was the maximum, indicating the largest microstrain in the poling direction.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122486874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

The accident at Three Mile Island 三里岛的事故

Materials Science Research International Pub Date : 2002-03-15 DOI: 10.2472/JSMS.51.3APPENDIX_1

A. Mcevily, I. May

引用次数: 11

Post-localization Analysis by the Subloading Surface Model with Tangential Stress Rate Effect 考虑切向应力率效应的下加载面模型后定位分析

Materials Science Research International Pub Date : 2001-12-15 DOI: 10.2472/JSMS.50.12APPENDIX_265

K. Hashiguchi, A. Protasov, T. Okayasu

{"title":"Post-localization Analysis by the Subloading Surface Model with Tangential Stress Rate Effect","authors":"K. Hashiguchi, A. Protasov, T. Okayasu","doi":"10.2472/JSMS.50.12APPENDIX_265","DOIUrl":"https://doi.org/10.2472/JSMS.50.12APPENDIX_265","url":null,"abstract":"Various constitutive models have been applied to the analyses of localized deformation of solids. However, most of them fall within the framework of the conventional plasticity premising that the interior of yield surface is an elastic domain and obeys the plastic potential theory in which the plastic stretching is independent of the stress rate component tangential to the yield surface. Therefore, they predict a stiff elastic response until the stress reaches the yield state and further a stiff elastoplastic response after yielding. On the other hand, the subloading surface model falling within the unconventional plasticity would be only the model capable of describing pertinently the plastic deformation induced by the rate of stress within the yield surface in general loading process including the unloading, reloading and inverse loading. Further, the numerical calculation by this model is quite efficient disusing the special algorism, e.g. the mean normal method and the radial return method in order to make the stress lie just on the yield surface in the plastic loading process since it contains the controlling function to make the stress approach automatically the yield surface in the plastic loading process. Further, this model is recently extended so as to describe the tangential stress rate effect, i.e. the inelastic deformation induced by the stress rate component tangential to the subloading surface. In this article the post-localized deformation of metal due to the shear band formation is analyzed by the finite element method incorporating the subloading surface model with the tangential stress rate effect. Thus, the influence of the tangential stress rate effect on the shear band formation is discussed exhibiting several examples of the deformation patterns.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121609279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9