Jsme International Journal Series A-solid Mechanics and Material Engineering最新文献_第8页

Subsurface Crack Initiation and Propagation Mechanism under the Super-Long Fatigue Regime for High Speed Tool Steel (JIS SKH51) by Fracture Surface Topographic Analysis 高速工具钢(JIS SKH51)超长疲劳状态下亚表面裂纹萌生与扩展机理的断口形貌分析

Jsme International Journal Series A-solid Mechanics and Material Engineering Pub Date : 2006-01-15 DOI: 10.1299/JSMEA.49.1

K. Shiozawa, Y. Morii, S. Nishino

{"title":"Subsurface Crack Initiation and Propagation Mechanism under the Super-Long Fatigue Regime for High Speed Tool Steel (JIS SKH51) by Fracture Surface Topographic Analysis","authors":"K. Shiozawa, Y. Morii, S. Nishino","doi":"10.1299/JSMEA.49.1","DOIUrl":"https://doi.org/10.1299/JSMEA.49.1","url":null,"abstract":"In order to study the subsurface crack initiation and propagation mechanism of high strength steel under a very high cycle fatigue regime, computational simulation with fracture surface topographic analysis (FRASTA) was carried out for subsurface fatigue crack initiated specimens of high speed tool steel (JIS SKH51) obtained from the rotating bending fatigue test in air. A remarkable area formed around the nonmetallic inclusion inside the fish-eye region on the fracture surface, which is a feature on the fracture surface in super long fatigue. This so-called GBF (granular-bright-facet) was observed in detail by a scanning probe microscope and a three-dimensional SEM. The GBF area, in which a rich carbide distribution was detected by EPMA, revealed a very rough and granular morphology in comparison with the area inside the fish-eye. It was clearly simulated by FRASTA that multiple microcracks were initiated and dispersed by the decohesion of a spherical carbide from the matrix around a nonmetallic inclusion, and converged into the GBF area during the fatigue process. After the formation of the GBF area, interior cracks grew radially and a fish-eye pattern formed on the fracture surface.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133569112","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: 35

Ab-Initio Lattice Instability Analysis on Ni and Ni3Al Single Crystals Ni和Ni3Al单晶的Ab-Initio晶格不稳定性分析

Jsme International Journal Series A-solid Mechanics and Material Engineering Pub Date : 2006-01-15 DOI: 10.1299/JSMEA.49.100

K. Yashiro, K. Yamagami, K. Kubo, Y. Tomita

{"title":"Ab-Initio Lattice Instability Analysis on Ni and Ni3Al Single Crystals","authors":"K. Yashiro, K. Yamagami, K. Kubo, Y. Tomita","doi":"10.1299/JSMEA.49.100","DOIUrl":"https://doi.org/10.1299/JSMEA.49.100","url":null,"abstract":"The purpose of the present study is to elucidate the “ideal strength” of the Ni and Ni3Al single crystals, the main compositions of Ni-based superalloy, from the viewpoint of the lattice stability. The unit lattices of Ni and Ni3Al, fcc and L12 ordered alloy, are subjected to the [001] uniaxial tension/compression and hydrostatic tension/compression by using the Vienna Ab-initio Simulation Package (VASP) with the generalized gradient approximation (GGA) and ultrasoft pseudopotential. The elastic stiffness matrix is numerically evaluated at each point in the applied deformation pass, then the lattice stability is discussed based on the positiveness of the matrix. Both Ni and Ni3Al reach the Born’s stability criteria against the bifurcation to the anisotropic Poisson’s contraction in the [001] uniaxial tension, while they do the spinodal criteria against the structural transformation in the [001] uniaxial compression and hydrostatic tension. The hydrostatic compression increases the stability and shows no limit, however, it is also suggested that the spinodal instability appears when the ideal isotropy was broken. The “ideal strength” is evaluated with these stability limits and indicated as “yield curve” on the normal strain-lateral strain or normal stress-lateral stress planes.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133723115","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

Microstructure and Mechanical Properties of Purity Aluminum Refined with Salt Containing Ti and B Elements 含钛、B元素盐精制纯铝的组织与力学性能

Jsme International Journal Series A-solid Mechanics and Material Engineering Pub Date : 2006-01-15 DOI: 10.1299/JSMEA.49.95

Heng Zhang, T. Xuan, G. Shao, Luo-ping Xu

{"title":"Microstructure and Mechanical Properties of Purity Aluminum Refined with Salt Containing Ti and B Elements","authors":"Heng Zhang, T. Xuan, G. Shao, Luo-ping Xu","doi":"10.1299/JSMEA.49.95","DOIUrl":"https://doi.org/10.1299/JSMEA.49.95","url":null,"abstract":"The microstructure and mechanical properties of purity aluminum refined with salt containing Ti and B elements have been studied in detail with Optical Microscope and MTS (Mechanical Testing and Simulation). The salt containing weight ratio of 22.2 Ti : 1 B has the most refining effect on the purity aluminum with the finest structure and the best mechanical properties, meanwhile it also possesses the advantages of short reacting time (within 5 minutes) and long fading time (more than 20 hours). The refining effect of the salt increases with the content of Ti and B in the melting and the refining mechanism is mainly contributed to the heterogeneous nuclei of more fine TiAl3 particles dispersed in the melting, which come from the reaction between the salt and aluminum. Purity B contained salt has little or no directly refining effect, However, B contained salt has indirect refining effect on the purity aluminum when it is added simultaneously with Ti contained salt, this may be due to that the dispersive and fine boride (TiB2) could be taken as the heterogeneous nuclei for TiAl3 particle, and then prevents the coarsening of the TiAl3 particle.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126491567","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

Quantitative Evaluation of Left Ventricular Wall Motion in Patient with Coronary Artery Bypass Grafting Using Magnetic Resonance Tagging Technique 磁共振标记技术定量评价冠状动脉搭桥术患者左室壁运动

Jsme International Journal Series A-solid Mechanics and Material Engineering Pub Date : 2005-11-25 DOI: 10.1299/JSMEA.49.597

T. Inaba, T. Nakano, M. Tsutsumi, S. Kawasaki, Y. Kinosada, M. Tokuda

{"title":"Quantitative Evaluation of Left Ventricular Wall Motion in Patient with Coronary Artery Bypass Grafting Using Magnetic Resonance Tagging Technique","authors":"T. Inaba, T. Nakano, M. Tsutsumi, S. Kawasaki, Y. Kinosada, M. Tokuda","doi":"10.1299/JSMEA.49.597","DOIUrl":"https://doi.org/10.1299/JSMEA.49.597","url":null,"abstract":"Left ventricular wall motions during systole were investigated from a mechanical perspective by using a magnetic resonance tagging technique. Subjects were 7 patients with coronary artery bypass grafting (CABG). First, by analyzing strain in the left ventricular wall, cardiac contractility was evaluated in the patients with CABG. Next, by calculating displacement in the myocardial wall, paradoxical movements following CABG were quantitatively evaluated. Strain analysis showed local decreases in circumferential strain in 4 of 7 subjects. The results of displacement analysis clarified that following CABG, the degree of radial displacement was small in the septal wall and large in the lateral wall, and circumferential displacement towards the septal wall occurred in the anterior and posterior walls. Since this behavior was seen in both reduced and normal cardiac contractility groups, paradoxical movements in the present patients were not caused by reduced cardiac contractility, but rather by rigid-body motion of the entire heart.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114769790","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

Prediction of Mechanical Behaviour of Low Carbon Steel at High Strain Rate Using Thermal Activation Theory and Static Data 利用热活化理论和静态数据预测低碳钢在高应变率下的力学行为

Jsme International Journal Series A-solid Mechanics and Material Engineering Pub Date : 2005-10-15 DOI: 10.1299/JSMEA.48.228

K. Ogawa, Hidetoshi Kobayashi, F. Sugiyama, K. Horikawa

引用次数: 12

Effect of Production Conditions of Wood Powder on Bending Properties of Wood Powder Molding Material without Adhesive 木粉生产条件对无粘结木粉成型材料弯曲性能的影响

Jsme International Journal Series A-solid Mechanics and Material Engineering Pub Date : 2005-10-15 DOI: 10.1299/JSMEA.48.432

H. Imanishi, Naho Soma, O. Yamashita, T. Miki, Kozo Kanayama

{"title":"Effect of Production Conditions of Wood Powder on Bending Properties of Wood Powder Molding Material without Adhesive","authors":"H. Imanishi, Naho Soma, O. Yamashita, T. Miki, Kozo Kanayama","doi":"10.1299/JSMEA.48.432","DOIUrl":"https://doi.org/10.1299/JSMEA.48.432","url":null,"abstract":"The effect of production conditions of wood powder on the bending properties of wood powder molding material was investigated. Wood powder was produced by milling wood into powder under conditions of different temperatures (25◦C, 100◦C) and moisture contents (0%MC, about 30%MC). Molding materials were produced from wood powder in stream atmosphere of high temperature and high pressure (175◦C, 900 kPa) using self-bonding ability of the wood powder. Adhesives, such as a synthetic resin, were not used. To evaluate the bending properties of the molding materials, the modulus of elasticity and the bending strength were examined by static three-point bending test. As for the characteristic of wood particle, in case of wood particle produced by milling wood under a condition of high temperature and high moisture content (100◦C and about 30%MC), tendencies for intercellular layer to be exposed on surface of a particle and for the aspect ratio of particles to be large were confirmed. And in that case, the molding material showed the highest value in modulus of elasticity and bending strength. It is highly probable that the inprovement of the self-bonding ability of wood powder and the increase of the aspect ratio of wood particle take part in the improvement of strength properties of molding material.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124822841","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: 13

Effect of Fillet Geometry to Joint Strength of Four-Pipe-Brazed Specimen for Rocket Nozzle Skirt 圆角几何形状对火箭喷嘴裙边四管钎焊试样接头强度的影响

Jsme International Journal Series A-solid Mechanics and Material Engineering Pub Date : 2005-10-15 DOI: 10.1299/JSMEA.48.406

T. Ikeshoji, A. Suzumura, T. Yamazaki

引用次数: 0

Selective Laser Sintering Method Using Titanium Powder Sheet Toward Fabrication of Porous Bone Substitutes 钛粉片选择性激光烧结制备多孔骨替代物

Jsme International Journal Series A-solid Mechanics and Material Engineering Pub Date : 2005-10-15 DOI: 10.1299/JSMEA.48.369

T. Hayashi, K. Maekawa, M. Tamura, K. Hanyu

引用次数: 26

Effect of Force Correction Algorithm Arising from Change of Tool Normal on Sheet Metal Forming Simulation 刀具法向变化引起的力校正算法对板料成形模拟的影响

Jsme International Journal Series A-solid Mechanics and Material Engineering Pub Date : 2005-10-15 DOI: 10.1299/JSMEA.48.329

T. Hama, M. Asakawa, M. Takamura, A. Makinouchi, C. Teodosiu

引用次数: 6

Improvement of Surface Layer Characteristics by Shot Lining 喷丸衬法改善表面层特性

Jsme International Journal Series A-solid Mechanics and Material Engineering Pub Date : 2005-10-15 DOI: 10.1299/JSMEA.48.269

Y. Harada

引用次数: 3