Materials Science Research International最新文献_第9页

EFFECT OF FRICTION WELDING ON CHARACTERISTICS OF PURE TITANIUM/A5083 ALUMINUM ALLOY JOINT : Report 2:Metallurgical Properties of Joint Interface Region 摩擦焊接对纯钛/A5083铝合金接头特性的影响。报告2:接头界面区冶金性能

Materials Science Research International Pub Date : 1995-09-15 DOI: 10.2472/jsms.44.504appendix_188

A. Fuji, K. Ameyama, T. North, M. Kimura

引用次数: 5

Suitable sample area and number of divisions in the estimation of the maximum crack length by extreme value analysis: Evaluation of estimation accuracy independent of distribution forms 极值分析法估计最大裂纹长度时的合适样本面积和分区数:与分布形式无关的估计精度的评价

Materials Science Research International Pub Date : 1900-01-01 DOI: 10.2472/JSMS.44.540

T. Matsumura, M. Ichikawa

引用次数: 0

Creep-rupture lifetime distribution of boron fibers 硼纤维蠕变-断裂寿命分布

Materials Science Research International Pub Date : 1900-01-01 DOI: 10.2472/JSMS.45.6APPENDIX_123

K. Goda, J. Hamada

引用次数: 5

SIMULATION OF FRACTURING PROCESS OF WOOD BY FINITE ELEMENT METHOD 木材断裂过程的有限元模拟

Materials Science Research International Pub Date : 1900-01-01 DOI: 10.2472/JSMS.45.9APPENDIX_173

H. Yoshihara, M. Ohta

引用次数: 2

Assessment of Damage Tolerance and Reliability for Ceramics. 陶瓷的损伤容限和可靠性评估。

Materials Science Research International Pub Date : 1900-01-01 DOI: 10.2472/JSMS.52.6APPENDIX_160

A. Suzuki, H. Baba

{"title":"Assessment of Damage Tolerance and Reliability for Ceramics.","authors":"A. Suzuki, H. Baba","doi":"10.2472/JSMS.52.6APPENDIX_160","DOIUrl":"https://doi.org/10.2472/JSMS.52.6APPENDIX_160","url":null,"abstract":"The risk of fracture does exist even in the carefully designed ceramic components under excess stress unexpected in design procedure such as high stresses caused by restraining the deformation at the contact region of the component. To assess the safety and the reliability of ceramics components under such circumstances, it is indispensable to take the damage tolerance of the material into consideration. Ceramics is thought to be perfectly brittle and have no damage tolerance. But, though very little, it has the damage tolerance. The important problems open to us now are to estimate the extent of the damage tolerance of ceramics quantitatively and to clear the relation between the damage tolerance of the material and the reliability of the component. In this paper, we demonstrate the existence of the damage tolerance in the ceramics by tests using specimens of a porous cordierite. The nonlinear stress-strain curve of the brittle material is thought to be a reflection of the damage tolerance of the material and it is shown that the nonlinear stress-strain curve obtained can be simulated by the distributed micro cracks model developed here. The relation between the damage tolerance and the reliability is also discussed through several simulation works. These simulations show that when the damage tolerance of the material is getting larger, the reliability of the component becomes higher. This conclusion is supported by the fracture test results using notched specimens of a porous cordierite where the notch sensitivity is shown to be very small in this material. This means that this material has the high reliability under the stress concentration.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114248633","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

Stereoscopic fracture surface analysis by SEM using advanced stereo matching 采用先进立体匹配技术的扫描电镜三维断口分析

Materials Science Research International Pub Date : 1900-01-01 DOI: 10.2472/JSMS.51.3APPENDIX_32

Jun Jiang, S. Sakai

{"title":"Stereoscopic fracture surface analysis by SEM using advanced stereo matching","authors":"Jun Jiang, S. Sakai","doi":"10.2472/JSMS.51.3APPENDIX_32","DOIUrl":"https://doi.org/10.2472/JSMS.51.3APPENDIX_32","url":null,"abstract":"Three-dimensional analysis of fracture surface by SEM (Scanning Electron Microscope) is inevitable to clarify the cause of fracture. It is effective to analyze with stereo matching. However, conventional template matching method to measure 3-dimensional profile of fracture surface usually employs fixed template size and has deficiencies such as mismatching and consuming much processing time. Therefore, in this paper, a new stereo matching algorithm is developed, which cannot only save processing time but assure accuracy. In this new template matching method, template size is varied to assure accuracy and lessen mismatching points. In order to shorten processing time greatly, when calculating the correlation coefficient of image template pixels to search the matching templates, all the pixels in templates are not employed, but it is proposed that one pixel is chosen every 2 or several pixels in the same positions of the two templates. In order to investigate the precision and the usefulness of the proposed method, two examples of reconstructing fracture surfaces are successfully shown. It is practically realized to measure three-dimensional profile of fracture surface in personal computer.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127527988","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

Fatigue Crack Growth Behavior in Silicon Nitride under Constant and Variable Amplitude Load Sequences 恒幅和变幅载荷作用下氮化硅疲劳裂纹扩展行为

Materials Science Research International Pub Date : 1900-01-01 DOI: 10.2472/jsms.49.6Appendix_116

Atsuhiro Koyama, A. Sugeta, Y. Uematsu, M. Jono

{"title":"Fatigue Crack Growth Behavior in Silicon Nitride under Constant and Variable Amplitude Load Sequences","authors":"Atsuhiro Koyama, A. Sugeta, Y. Uematsu, M. Jono","doi":"10.2472/jsms.49.6Appendix_116","DOIUrl":"https://doi.org/10.2472/jsms.49.6Appendix_116","url":null,"abstract":"In order to investigate cyclic fatigue crack growth behavior of a gas-pressure-sintered silicon nitride under constant and variable amplitude load sequences, fatigue crack growth tests were carried out using compact type (CT) specimens, The crack length and macroscopic crack closure were measured using an unloading elastic compliance method. Grain interlocking was observed around crack wake in all fatigue test conditions, which implied fatigue crack growth of this material was associated with progressive degradation of the grain interlocking by cyclic loading. The fatigue crack growth rate, da/dn, under constant amplitude loading was controlled not only by the maximum stress intensity factor, K max , but also the stress amplitude, while K max was the most important factor in cyclic fatigue crack growth. The overload and high-level load excursion produced the acceleration of fatigue crack growth and the downward shift of crack closure point under low-level loading. This decrease was thought to result from much severer crash or frictional wear of grain interlocking and the crack closure could explain the acceleration behavior qualitatively.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129165668","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 cold working and heat treatment on transformation temperature of Ti-41.7Ni-8.5Cu (at%) shape memory alloy and its probabilistic prediction 冷加工和热处理对Ti-41.7Ni-8.5Cu (at%)形状记忆合金相变温度的影响及其概率预测

Materials Science Research International Pub Date : 1900-01-01 DOI: 10.2472/jsms.52.6Appendix_167

M. Hosogi, N. Okabe, T. Sakuma, S. Miyazaki

{"title":"Effects of cold working and heat treatment on transformation temperature of Ti-41.7Ni-8.5Cu (at%) shape memory alloy and its probabilistic prediction","authors":"M. Hosogi, N. Okabe, T. Sakuma, S. Miyazaki","doi":"10.2472/jsms.52.6Appendix_167","DOIUrl":"https://doi.org/10.2472/jsms.52.6Appendix_167","url":null,"abstract":"The transformation temperatures of shape memory alloy vary with the composition and processing and manufacturing conditions of the alloy. The purpose of the present study is to clarify the effects of cold working and heat treatment on various transformation temperatures, and to estimate probabilistically the transformation temperatures by means of a model. The shape memory alloy used was Ti-41.7Ni-8.5Cu (at%), and the transformation temperatures were measured by the differential scanning calorimeter method (DSC method). The effects of processing and heat treatment on the transformation temperatures were investigated by changing the cold working ratio (10-40 %) and the heat treatment temperature (623-773 K), respectively. As a result, the transformation temperatures were found to decrease with increasing cold working ratio. The transformation temperatures were also found to increase with increasing heat treatment temperature. Therefore, the transformation temperatures were modeled by considering quantitatively the effects of the cold working ratio and the heat treatment temperature. A probabilistic prediction formula was proposed so that the reliability of the prediction may be estimated quantitatively.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129642538","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

Quality Evaluation of Molded Epoxy Resin and Particulate Filled Composites by Ultrasonic Technique 用超声技术评价环氧树脂模压及颗粒填充复合材料的质量

Materials Science Research International Pub Date : 1900-01-01 DOI: 10.2472/jsms.50.3Appendix_61

K. Arai, Wen Li, S. Ono, A. Kanetaka, H. Hojo

引用次数: 0

FATIGUE LIFE DISTRIBUTION AND ITS SIMULATION IN SPHEROIDAL GRAPHITE CAST IRONS 球墨铸铁疲劳寿命分布及其模拟

Materials Science Research International Pub Date : 1900-01-01 DOI: 10.2472/JSMS.44.187

K. Tokaji, T. Ogawa

{"title":"FATIGUE LIFE DISTRIBUTION AND ITS SIMULATION IN SPHEROIDAL GRAPHITE CAST IRONS","authors":"K. Tokaji, T. Ogawa","doi":"10.2472/JSMS.44.187","DOIUrl":"https://doi.org/10.2472/JSMS.44.187","url":null,"abstract":"Statistical fatigue tests have been carried out using smooth specimens of a spheroidal graphite cast iron (SGI) with ferritic microstructure and the fatigue life distribution was examined. It was found that fatigue cracks initiated from casting defects and thus fatigue life could be regarded as crack growth life. The scatter of fatigue life was primarily attributed to the scatter of the size of casting defects. The prediction of fatigue life was performed using the measured growth characteristics of small fatigue cracks. The results obtained agreed well with the experimental data. From the practical viewpoint, similar prediction was conducted using the growth characteristic of large cracks. When the crack opening stress was assumed to be zero, the results obtained gave longer lives than the experimetal data at high stress, but were coincident with the experimental data at low stress. Furthermore, a Monte Carlo simulation was performed using the measured distribution function of casting defect size and the similar results were obtained. In order to discuss the universality of the proposed prediction and simulation, additional fatigue tests were conducted on two SCI's with pearlitic and bull's eye microstructures, and it was found that the fatigue strength was independent of microstructure. The distribution of casting defect size in pearlitic microstructure was examined, which agreed closely with that in ferritic microstructure. This indicated that if the distribution of the size of casting defects from which cracks initiated was the same in different SCI's, then fatigue strength would be independent of microstructure, and the validity of the prediction and simulation of fatigue life distribution was confirmed.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":" 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120829316","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: 8