Transactions of the Japan Society of Mechanical Engineers. A最新文献_第2页

Effect of size and depth of small defect on the rolling contact fatigue strength of a bearing steel SUJ2 小缺陷尺寸和深度对轴承钢SUJ2滚动接触疲劳强度的影响

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-08-19 DOI: 10.1299/KIKAIA.79.961

H. Komata, J. Yamabe, H. Matsunaga, Y. Fukushima, S. Matsuoka

{"title":"Effect of size and depth of small defect on the rolling contact fatigue strength of a bearing steel SUJ2","authors":"H. Komata, J. Yamabe, H. Matsunaga, Y. Fukushima, S. Matsuoka","doi":"10.1299/KIKAIA.79.961","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.961","url":null,"abstract":"Rolling contact fatigue tests of JIS-SUJ2 steel were performed using plate specimens having a small drill hole with various diameters and depths. In all the tests, fatigue crack initiated at the edge near the bottom of the hole just after starting the fatigue test, and then propagated by shear mode. Even in the unbroken specimens tested up to N = 2×10 cycles, a short fatigue crack was found at the edge. Fatigue life, Nf, plotted against the maximum contact pressure, qmax, was greatly varied according to the diameter and depth of the hole. The effect of the depth at crack initiation on the fatigue life Nf was uniquely characterized by using the nominal shear stress amplitude, τa, instead of qmax. Further, based on the consideration of the rolling contact fatigue strength as a small shear-mode crack problem, the fatigue life data were plotted using the novel parameter, τ a/( area ), where the area is a projected area of the hole. Consequently, all the fatigue life data were successfully fitted on a unified line irrespective of the diameter and depth of the hole, i.e. a defect size dependence in the rolling contact fatigue strength was manifested in a small crack regime. Moreover, the fatigue life data for smooth specimens fractured from an internal non-metallic inclusion were also in accordance with the data for the drill holes in the plot of Nf versus τ a/( area ). The result infers that a lower limit of the rolling contact fatigue strength of bearings with various dimensions can be evaluated by means of the following two dominant parameters: (i) maximum inclusion size predicted by the statistics of extremes in a given control volume and (ii) the maximum value of nominal shear stress amplitude produced under the rolling contact.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122158417","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: 12

Improvement of mechanical properties of dental materials by shot peening 喷丸强化对牙科材料力学性能的改善

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-08-19 DOI: 10.1299/KIKAIA.79.1019

Y. Aoyagi, Yusuke Kawaragi, Ai Tokue, C. Ohkubo, O. Takakuwa, H. Soyama

引用次数: 0

Fundamental mechanisms causing reduction in fretting fatigue strength by hydrogen (Effect of hydrogen on small crack initiation at the adhered spot) 氢降低微动疲劳强度的基本机理(氢对附着点小裂纹萌生的影响)

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-07-17 DOI: 10.1299/KIKAIA.79.536

Ryosuke Komoda, M. Kubota, Y. Kondo, J. Furtado

{"title":"Fundamental mechanisms causing reduction in fretting fatigue strength by hydrogen (Effect of hydrogen on small crack initiation at the adhered spot)","authors":"Ryosuke Komoda, M. Kubota, Y. Kondo, J. Furtado","doi":"10.1299/KIKAIA.79.536","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.536","url":null,"abstract":"The authors have reported a significant reduction in fretting fatigue strength of austenitic stainless steels due to hydrogen. One of the causes of the reduced fretting fatigue strength in hydrogen is adhesion between contacting surfaces and following formation of small cracks which emanate from the adhered spots. The objective of this study is to understand the effect of hydrogen on the initiation of the small cracks under fretting fatigue conditions. Since the adhesion between contacting surfaces during fretting in hydrogen is very localized, a small contact length was used in this test in order to facilitate understanding by avoiding such localization. The fretting fatigue test of an austenitic stainless steel SUS304 was performed in air and 0.13MPa hydrogen. In the fretting fatigue test, hydrogen participates in the initiation of the fretting fatigue crack. It can be presumed that high strain at the contact edge activates hydrogen assisted fracture in terms of dislocation mobility. Adhesion mimic test, in which a small contact area was welded, was also performed. As the result, the crack initiation limit evaluated by the maximum range of shear stress was significantly lower in hydrogen than in air. Hydrogen assists small crack initiation under fretting fatigue conditions. This is one of the possible causes of the significant reduction of fretting fatigue strength in hydrogen.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114074120","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

3次元マイクロラティスで構成された梁の曲げ特性評価（第1報数値解析に基づく検討）三维微提拉构成的梁的弯曲特性评价(基于第1报告数值分析的讨论)

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-07-17 DOI: 10.1299/KIKAIA.79.620

K. Ushijima, Takashi Akiyoshi, Dai-heng Chen, Takeshi Nakahara, W. Cantwell

引用次数: 2

FEM stress analysis and sealing performance evaluation of pipe flange connection under cyclic internal pressure and thermal changes 循环内压和热变化下管道法兰连接有限元应力分析及密封性能评价

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-05-06 DOI: 10.1299/KIKAIA.79.142

Yuya Omiya, T. Sawa, Y. Takagi, H. Torii

{"title":"FEM stress analysis and sealing performance evaluation of pipe flange connection under cyclic internal pressure and thermal changes","authors":"Yuya Omiya, T. Sawa, Y. Takagi, H. Torii","doi":"10.1299/KIKAIA.79.142","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.142","url":null,"abstract":"The effects of cyclic internal pressure and thermal changes on the sealing performance and mechanical behaviors in pipe flange connection are examined using the FEM analyses for pipe flange connections with spiral wound gasket (SWG). The contact gasket stress distributions and the axial bolt forces taking into account the cyclic internal pressure and thermal changes are demonstrated. The load (internal pressure, thermal changes) sequences are determined from the conditions for actual pipe flange connections used in petroleum and chemical plants. Furthermore, the effect of material differences between pipe flange and bolts on the contact gasket stress distribution are examined. From the FEM results, it is found that the contact gasket stress reduces to be the smallest when a plant is restarted. The reduced contact gasket stress should be taken into account in the sealing design of the connection. On the other hand, the leakage tests were carried out to verify the FEM results and the effect of number of cycles (for 21days). A fairy good agreement is seen between the estimated amount of leakage due to the contact gasket stress distributions obtained from the FEM and the measured amount of leakage. It is found that the contact gasket stress decreases when the plant is restarted and as the temperature decreases. At that time, the contact gasket stress is the smallest which may lead to a leakage accident.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131925278","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

Specimen size effect of interface strength distribution induced by grain structure of Cu line Cu线晶粒结构诱导界面强度分布的试样尺寸效应

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-05-06 DOI: 10.1299/KIKAIA.79.354

Chuantong Chen, N. Shishido, K. Koiwa, S. Kamiya, H. Sato, M. Nishida, M. Omiya, Takashi Suzuki, Tomoji Nakamura, Toshiaki Suzuki, T. Nokuo

{"title":"Specimen size effect of interface strength distribution induced by grain structure of Cu line","authors":"Chuantong Chen, N. Shishido, K. Koiwa, S. Kamiya, H. Sato, M. Nishida, M. Omiya, Takashi Suzuki, Tomoji Nakamura, Toshiaki Suzuki, T. Nokuo","doi":"10.1299/KIKAIA.79.354","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.354","url":null,"abstract":"©2013 The Japan Society of Mechanical Engineers A new technique for the evaluation of local interface adhesion energy was applied to the interface between Cu and cap layer in a Cu damascene interconnect structure, which consists of both the interfacial fracture test and the finite-element simulation. After specimens in-plane dimensions of 1×1 μm, 5×5 μm and 10×10 μm fractured by focused ion beam (FIB), the interfacial fracture test was implemented by a novel system with nano-indenter in FIB-SEM dual-beam microscope. With the maximum load measured during the fracture test employed in an elastic-plastic simulation, interface adhesion energy was evaluated and almost equal among all types of specimens. On the other hand, the variation of the evaluated interface adhesion energy tends to be larger with the decreasing specimen size. With the result of electron backscattering diffraction analysis for Cu lines whose average grain size were 400nm diameter, it is suggested that local interface strength significantly varies depending on local grain distribution in a Cu interconnect structure.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131563200","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

A modelling for craze behavior covering a wide range of strain rate and its application to simulation for fracture prediction of crystalline polymer 一种涵盖大应变速率的裂纹行为模型及其在结晶聚合物断裂预测模拟中的应用

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-05-06 DOI: 10.1299/KIKAIA.79.380

J. Takahashi, Toshiharu Yamamoto, K. Shizawa

{"title":"A modelling for craze behavior covering a wide range of strain rate and its application to simulation for fracture prediction of crystalline polymer","authors":"J. Takahashi, Toshiharu Yamamoto, K. Shizawa","doi":"10.1299/KIKAIA.79.380","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.380","url":null,"abstract":"Polymers show peculiar mechanical responses that are not observed in metals, such as remarkable strain rate dependency and ductile fracture caused by craze which is an assembly consisting of micro-voids and fibrils. In the design process for polymeric products, we attempt generally to predict the fracture position by commercial FEM solvers. However, we can not precisely reproduce the fracture behavior of polymers, because a material model that can express an accumulation of craze is not installed yet on the current commercial solvers. Therefore, so as to predict fracture on the basis of craze behavior, we proposed a constitutive equation with craze effect, the craze evolution equation that can express propagation and growth cessation of craze, the evolution of mean normal plastic strain and criterion for craze initiation with strain rate dependency in our previous work. In this study, our craze evolution equation is extended to an enhanced type covering wide range of strain rate and is proposed as a material model by combining with non-coaxial elastoviscoplastic constitutive equation and the evolution equations proposed in the previous work. Then, numerical uni-axial tensile tests in which applied strain rate is given at five levels between 0.01s and 100s are conducted on a commercial FEM solver LS-DYNA to which the present material model is added via user subroutine. Furthermore, we predict computationally the fracture positions under the condition of wide range of strain rates by using the criteria of craze concentration and fibril strength.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134315286","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

Effect of ply thickness on transverse crack initiation in CFRP cross-ply laminates under fatigue loading 层厚对疲劳载荷下CFRP交叉层合板横向裂纹萌生的影响

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-05-06 DOI: 10.1299/KIKAIA.79.249

Kenhichiro Kurihara, A. Hosoi, N. Sato, H. Kawada

{"title":"Effect of ply thickness on transverse crack initiation in CFRP cross-ply laminates under fatigue loading","authors":"Kenhichiro Kurihara, A. Hosoi, N. Sato, H. Kawada","doi":"10.1299/KIKAIA.79.249","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.249","url":null,"abstract":"The effect of ply thickness on the formation of first transverse crack caused in cross-ply carbon fiber reinforced plastic (CFRP) laminates was evaluated under fatigue loading. In addition, the initiation process of the transverse crack was observed with an atomic force microscopy (AFM) in detail. The formation of the first transverse crack was evaluated quantitatively with the power law between the transverse crack density growth rate and the normalized energy release rate range associated with transverse crack formation. The analytical results showed good agreement with the experimental results. Moreover, from the analytical results with the cross-ply [0/90 6 ] s and [0 2 /90 12 ] s laminates, it was shown that the fatigue life to the formation of the first transverse crack in [0/90 6 ] s is approximately 100 times longer than that in [0 2 /90 12 ] s . Furthermore, as the results observed the process of the transverse crack initiation with AFM, it was cleared that matrix resins around fibers were uplifted on the laminate edge surface due to cyclic loading. The observation results indicate that the micro cracks are initiated at the interface between fiber and matrix resin by the stress concentration due to the uplift of matrix resins, that the micro cracks grow to the thickness direction in 90° plies with concatenating the interfacial cracks and that the transverse crack is formed finally.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"2010 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131972023","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: 7

Damage behavior in unidirectional CFRP laminates with fiber discontinuity 纤维不连续单向CFRP层合板的损伤行为

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-05-06 DOI: 10.1299/KIKAIA.79.294

H. Nakatani, K. Nakaya, Akira Matsuba, Yousuke Kouno, S. Ogihara

{"title":"Damage behavior in unidirectional CFRP laminates with fiber discontinuity","authors":"H. Nakatani, K. Nakaya, Akira Matsuba, Yousuke Kouno, S. Ogihara","doi":"10.1299/KIKAIA.79.294","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.294","url":null,"abstract":"*1 Tokyo Univ. of Science, Dept. of Mechanical Engineering Yamazaki 2641, Noda, Chiba, 27848510 Japan An investigation into damage onset is presented for unidirectional CFRP laminates which contain fiber discontinuities. Complex carbon fiber composite geometry manufactured using prepregs accompanies fiber discontinuities that result from prepreg cutting. Unidirectional CFRP laminates with 2, 4 and 64ply discontinuity out of 8 plies are loaded in tension, and show lower fracture stress with more discontinuous plies though fracture strains are almost the same. Non4linear strain behavior just above the discontinuity and discontinuous strain behavior at 20mm away from the discontinuity are found to correspond to onset of crack in resin rich part at discontinuous fiber tip and interlaminar delamination between continuous and discontinuous plies, respectively. Onset stress of these cracks and delamination decreases with the number of discontinuous plies. A shear4lag analysis model that represents the fiber discontinuity in the laminates is proposed, and it is confirmed that obtained stress distribution agrees with that calculated by finite element analysis. Furthermore, it is identified that the onset stress of the two damage modes can be predicted by the shear4lag analysis in which energy release rate is incorporated.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128960150","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

Thermal stress of porous semi infinite media subjected to gas infiltration and heat transfer 气体渗透和传热作用下多孔半无限介质的热应力

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-05-06 DOI: 10.1299/KIKAIA.79.463

M. Arai

引用次数: 1