journal of the Japan Society for Testing Materials最新文献_第4页

Multi-scale Modeling of Degradation Behavior for Crystalline Polymer 结晶聚合物降解行为的多尺度建模

journal of the Japan Society for Testing Materials Pub Date : 2015-01-01 DOI: 10.2472/JSMS.64.311

M. Kudo, J. Takahashi, Toshiharu Yamamoto, M. Uchida, Y. Tomita

引用次数: 0

Influence of Shot Peening on Fatigue Properties of Extruded Magnesium Alloy AZ80 and Its Anisotropy 喷丸强化对挤压镁合金AZ80疲劳性能及其各向异性的影响

journal of the Japan Society for Testing Materials Pub Date : 2015-01-01 DOI: 10.2472/JSMS.64.865

Tomohisa Ohtagaki, M. Nakatani, Y. Harada

{"title":"Influence of Shot Peening on Fatigue Properties of Extruded Magnesium Alloy AZ80 and Its Anisotropy","authors":"Tomohisa Ohtagaki, M. Nakatani, Y. Harada","doi":"10.2472/JSMS.64.865","DOIUrl":"https://doi.org/10.2472/JSMS.64.865","url":null,"abstract":"The influence of shot peening on the fatigue strength in an extruded magnesium alloy AZ80 treated with T6 was investigated and its anisotropic behavior was discussed. The specimen was machined from different orientations in as-extruded rod. One was loaded in the transverse direction (T specimen). The other was loaded in the longitudinal direction (L specimen). The arc height value of shot peening was set to 0.15 and 0.40 mmN. The specimen surface became rough and hardness became high with an increase in the arc height value. Irrespective of specimen orientation, shot peening at low arc height value improved the fatigue strength. However, the shot peening at high arc height value did not improve the fatigue strength. The same tendency appeared in the case of T4-treated sample, suggesting that precipitation did not affect the fatigue strength degradation by hard shot peening. To investigate the influence of surface roughness formed by shot peening, fatigue tests were conducted using some specimens polished after shot peening. In the L specimen, the polishing after shot peening improves the fatigue life significantly. Therefore, the surface roughness formed by shot peening is one of the important factors in fatigue strength of shot-peened specimen. On the other hand, the fatigue life of T specimen decreased by polishing after shot peening. It was suggested that microstructural damage induced by shot peening decreases the fatigue strength in T specimen.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79702496","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: 6

Application of an Elasto-viscoplatic Model to the Gas Hydrate-bearing Soil 弹粘塑性模型在含天然气水合物土中的应用

journal of the Japan Society for Testing Materials Pub Date : 2015-01-01 DOI: 10.2472/JSMS.64.317

S. Kimoto, Hiromasa Iwai, Kazuki Saimyo, T. Shindo, F. Oka

引用次数: 3

Introduction of biomaterials for beginners V: Forefront of biomaterial research in regenerative medical engineering 生物材料入门:再生医学工程中生物材料研究的前沿

journal of the Japan Society for Testing Materials Pub Date : 2014-09-01 DOI: 10.2472/JSMS.63.684

S. Miyata, Mototsugu Tanaka

引用次数: 1

Effect of Pre-Deformation on Fracture Behavior Transition due to Strain-Rate Change in Fe-5%Si Alloy 预变形对Fe-5%Si合金应变速率变化导致断裂行为转变的影响

journal of the Japan Society for Testing Materials Pub Date : 2014-06-15 DOI: 10.2472/JSMS.63.467

T. Mizuguchi, Ryota Oouchi, Yasuhiro Tanaka

引用次数: 0

A New Method of X-Ray Measurement of Residual Stress in Short-Fiber Reinforced Plastics x射线测量短纤维增强塑料残余应力的新方法

journal of the Japan Society for Testing Materials Pub Date : 2014-01-01 DOI: 10.2472/JSMS.63.514

Keisuke Tanaka, Shohei Tokoro, Y. Koike, N. Egami, Y. Akiniwa

{"title":"A New Method of X-Ray Measurement of Residual Stress in Short-Fiber Reinforced Plastics","authors":"Keisuke Tanaka, Shohei Tokoro, Y. Koike, N. Egami, Y. Akiniwa","doi":"10.2472/JSMS.63.514","DOIUrl":"https://doi.org/10.2472/JSMS.63.514","url":null,"abstract":"The X-ray diffraction method is used to measure the residual stress in injection-molded plates of short-fiber reinforced plastics (SFRP) made of crystalline thermoplastics, polyphenylene sulphide (PPS), reinforced by carbon fibers with 30 mass%. Based on the orientation of carbon fibers, injection molded plates can be modeled as three-layered lamella where the core layer is sandwiched by two skin layers. The stress in the matrix in the skin layer was measured by Cr-Kα radiation by the sinψ method. Since the X-ray penetration depth is shallow, the state of stresses measured by X-rays in FRP can be assumed to be plane stress. The X-ray measurement of stress in carbon fibers was not possible because of high texture. A new method was proposed to evaluate the macrostress in SFRP from the measurement of the matrix stress. According to micromechanics analysis of SFRP, the matrix stresses in the fiber direction, 1 m σ and perpendicular to the fiber direction, 2 m σ , and shear stress 12 m τ can be expressed as the functions of the applied (macro) stresses, 1 A σ , 2 A σ , 12 A τ as follows: 1 11 1 12 2 m A A , σ α σ α σ = + 2 21 1 22 2 m A A σ α σ α σ = + , 12 66 12 m A τ α τ = , where 11 12 21 22 66 , , , , α α α α α are stress-partitioning coefficients. Using skin-layer strips cut parallel, perpendicular and 45° to the molding direction, the stress in the matrix was measured under the uniaxial applied stress and the stress-partitioning coefficients of the above equations were determined. Once these relations are established, the macrostress in SFRP can be determined from the measurements of the matrix stresses by X-rays. Microscopic phase stresses due to the mismatch of the thermal expansion coefficient between matrix and fiber was negligible in X-ray stress measurement of the skin layer.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85744517","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: 5

Influence of Self-assembly Conditions on Film Formation, Optical and Electrical Properties of Gold Nanoparticle Network Film 自组装条件对金纳米粒子网络薄膜形成及光电性能的影响

journal of the Japan Society for Testing Materials Pub Date : 2014-01-01 DOI: 10.2472/JSMS.63.763

D. Yonekura, Hiroki Ushita, Y. Sakaguchi, R. Murakami

引用次数: 0

Significance of Pore Pressure Monitoring in Monitoring of Crustal Stress and Strain 孔隙压力监测在地应力应变监测中的意义

journal of the Japan Society for Testing Materials Pub Date : 2014-01-01 DOI: 10.2472/JSMS.63.265

Y. Kano, C. Kinoshita, Hisao Itô

{"title":"Significance of Pore Pressure Monitoring in Monitoring of Crustal Stress and Strain","authors":"Y. Kano, C. Kinoshita, Hisao Itô","doi":"10.2472/JSMS.63.265","DOIUrl":"https://doi.org/10.2472/JSMS.63.265","url":null,"abstract":"Pore pressure of the rock mass is successfully monitored at higher frequencies (0.1 Hz ~ 2 Hz) using borehole. The frequency response of monitoring of pore pressure is significantly improved by closing the well, which reduces a high-cut response caused by wellbore storage effect in open wells. The response of pore pressure for stress or strain change is represented by linear poroelastic theory that describe mechanical coupling between rock mass and pore fluid. We revealed that even in crystalline rock the pore pressure change induced by deformation such as barometric pressure change, earth tides, and seismic waves is in agreement with theoretical model derived from the linear poroelastic theory. Pore pressure can be a proxy of stress and/or strain as studies on such as crustal deformation that have been made. It should be noted, however, that the applicable range of frequency is usually limited and absolute value of stress is difficult to be determined from pore pressure monitoring. Since amplitude and phase of pore pressure change induced by deformation depends on frequency, the sensitivity of pore pressure as a proxy of stress differs with frequency. The sensitivity may vary with time during a cycle of earthquake. The response to seismic waves follows prediction from poroelastic theory for both large and intermediate earthquakes. The sensitivity is robust at least for the amplitude of deformation induced by seismic waves. The response of pore pressure to tidal strain varies before and after large earthquake is observed, which may be attributed to apparent change of the sensitivity caused by change in diffusivity.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75092857","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: 0

Change in Elastic Property of Granite by Repeated Stress Change 反复应力变化对花岗岩弹性性能的影响

journal of the Japan Society for Testing Materials Pub Date : 2014-01-01 DOI: 10.2472/JSMS.63.239

Youqing Chen, A. Yamazaki

{"title":"Change in Elastic Property of Granite by Repeated Stress Change","authors":"Youqing Chen, A. Yamazaki","doi":"10.2472/JSMS.63.239","DOIUrl":"https://doi.org/10.2472/JSMS.63.239","url":null,"abstract":"The demand for the long-term safety utilization of rock structures has increased further in recent years. It has been reported that the repeated stress change induced the deterioration of rocks. However, there still remain many unknowns about the deterioration of rocks by repeated stress change. To obtain further insights into the deterioration of granite by repeated stress change, change in elastic property of specimen during the test was analyzed in detail. Cylindrical Westerly granite specimen with 20mm in height and 10mm in diameter was subjected to the cyclic loading with maximum 160 MPa (approximately 80% of the estimated uniaxial compressive strength) and minimum 0.5 MPa at room temperature. Axial and lateral strains, and the applied load were simultaneously measured at 100 points for one cycle, and Young's modulus and Poisson's ratio until failure were estimated applying these measured data. As a result, the characteristic changes in two elastic properties following the progress of the deterioration stage were revealed. At the initial degradation stage, the changes were very small. During the second steady stage, two properties were changed gradually and linearly. At the final accelerated stage, the changes were drastically. It was also found that these characteristic alterations were well accorded with the reported microcrack growth patterns.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74338964","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: 0

Effects of Fiber Reinforcing Configuration on Oxidation and Melting Phenomenon of CF/PPS Laminated Composites by Electrically-Conducting 纤维增强结构对导电CF/PPS层压复合材料氧化和熔融现象的影响

journal of the Japan Society for Testing Materials Pub Date : 2014-01-01 DOI: 10.2472/JSMS.63.368

D. Tanabe, K. Nishiyabu, T. Kurashiki

引用次数: 3