Transactions of the Japan Society of Mechanical Engineers. A最新文献_第3页

Evaluation of strength of diesel engine cylinder block by finite element analysis based on microstructure of gray cast iron 基于灰铸铁组织的柴油机缸体强度有限元分析

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-05-06 DOI: 10.1299/KIKAIA.79.281

K. Iguchi, N. Tada, I. Shimizu

{"title":"Evaluation of strength of diesel engine cylinder block by finite element analysis based on microstructure of gray cast iron","authors":"K. Iguchi, N. Tada, I. Shimizu","doi":"10.1299/KIKAIA.79.281","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.281","url":null,"abstract":"Stress distribution of gray cast iron was analyzed by the finite element analysis based on the actual distribution of graphite flakes embedded in pearlite. Three types of two-dimensional FE-models were used: (1) “true model” where graphite flakes were distributed in pearlite as observed, (2) “voids model” where graphite flakes were replaced by voids of the same geometries, and (3) “single void model” where one of selected voids which showed higher stress in the vicinity of void tip in the pearlite. As the voids model showed higher stress in the vicinity of each void tip, it was concluded that the voids model was appropriate for the safe-side evaluation of gray cast iron strength. Furthermore, a simplified method of strength evaluation was proposed by comparing the results of the voids model with those of the single void model. Since the maximum ratio of the stress near the void tip was 6.27 between the voids model and the single void model, tensile and fatigue strengths of gray cast iron was evaluated by the stress intensity factor multiplied by 6.27 using the maximum length of graphite flakes, the threshold stress intensity factor range and fracture toughness of pearlite about the tested diesel engine cylinder block. The method validated the safety of cylinder block of the tested diesel engine.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"62 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":"129062638","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: 3

ALE finite element analysis of plastic indentation process of lubricated plate by the ball collision 滚珠碰撞对润滑板塑性压痕过程的ALE有限元分析

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-05-06 DOI: 10.1299/KIKAIA.79.477

Masanori Tsukui, S. Ozaki, K. Manabe, C. Tadokoro, K. Nakano

{"title":"ALE finite element analysis of plastic indentation process of lubricated plate by the ball collision","authors":"Masanori Tsukui, S. Ozaki, K. Manabe, C. Tadokoro, K. Nakano","doi":"10.1299/KIKAIA.79.477","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.477","url":null,"abstract":"©2013 The Japan Society of Mechanical Engineers In the present study, we apply an Arbitrary Lagrangian-Eulerian (ALE) finite element method, which can rationally solve the interaction behavior between the fluid flow and the nonlinear solid deformation, to the simulation of indentation process of lubricated elastoplastic plates by the ball collision. As have been reported by numerous experimental works, it is also shown by the present numerical approach that the characteristic of lubricant affects indentation profiles. For instance, the indentation profile represents the conical shape due to viscous property of lubricant, while the profile represents the bowl-type shape under the dry condition. Based on the systematic numerical investigation, it is confirmed in the case of lubricated condition that the indentation is formed through the pressure of a fluid. Then, a squeeze effect of viscous flow and a shut-up of lubricant, which is caused by velocity of lateral flow, are observed. Furthermore, it is understood that the conical shape of indentation profile is formed at an initial contact stage, and then its size similarly grow up during loading. Thus, it is confirmed that the ALE finite element method is one of effective methods for the examination of impact problems on lubricated surfaces.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"13 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":"114375297","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 Failure by Flow-Induced Vibration. 流动诱发振动引起的疲劳失效。

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2013-02-09 DOI: 10.1299/KIKAIA.66.1322

Y. Murakami, M. Inoue, A. Sueoka, Satoru Odahara, M. Kobayashi, N. Fujiwara

引用次数: 1

Shrinkage force analysis of light-cured composite resin 光固化复合树脂的收缩力分析

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-11-09 DOI: 10.1299/KIKAIA.78.1490

K. Arakawa

引用次数: 0

Load path U* analysis in passenger car body structures and load transfer balance in structural components 乘用车车身结构载荷路径U*分析及结构构件载荷传递平衡

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-11-09 DOI: 10.1299/KIKAIA.78.1462

Y. Kumazawa, S. Kuwahara, M. Omiya, Kunihiro Takahashi

{"title":"Load path U* analysis in passenger car body structures and load transfer balance in structural components","authors":"Y. Kumazawa, S. Kuwahara, M. Omiya, Kunihiro Takahashi","doi":"10.1299/KIKAIA.78.1462","DOIUrl":"https://doi.org/10.1299/KIKAIA.78.1462","url":null,"abstract":"The authors investigate the overall structural balance of stiffness from the viewpoint of load transfer and load paths. The concept of load transfer balance is examined and graphically expressed using U*. Index U* is a new concept introduced by the authors to express load transfer in structures. The load transfer balance is calculated for an automotive body structure under conditions of vertical loading on the front suspension. The load transfer balance of a body affects the drivability of an automobile. Through the use of figures showing the U* distribution along load transfer paths, the balance of load transfer is clearly expressed. From these figures, it is shown that frontal load is mainly transferred to the lower structure rather than to the upper structure in the vehicle body used in this study. Diagrams and histograms for U*sum, which is the summation of two kinds of U*s, are presented in this study to show the load transfer balance more precisely. These figures show that the transition of load transfer balance to the lower structure is caused by the stiffened support effect near the rear supporting points.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124825753","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

Proposal of rolling contact fatigue crack growth test using a specimen with a small artificial hole 提出了带小人工孔的滚动接触疲劳裂纹扩展试验方法

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-10-17 DOI: 10.1299/KIKAIA.78.1250

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

{"title":"Proposal of rolling contact fatigue crack growth test using a specimen with a small artificial hole","authors":"H. Komata, J. Yamabe, Y. Fukushima, S. Matsuoka","doi":"10.1299/KIKAIA.78.1250","DOIUrl":"https://doi.org/10.1299/KIKAIA.78.1250","url":null,"abstract":"In order to improve the reliability of rolling bearings, it is necessary to clarify effects of hydrogen on rolling contact fatigue properties of bearing steels. This study shows a new method for the rolling contact fatigue crack growth testing. A small artificial hole makes quantitative evaluation of crack growth possible under rolling contact fatigue, although the rolling contact fatigue generally induces invisible inner crack initiation and growth from defects such as nonmetallic inclusions in the bearing steels. Firstly, shape of a small hole for rolling contact fatigue crack growth test was optimized on the basis of shear stress distribution around a small hole analyzed by FEM. New rolling contact fatigue tests were performed using uncharged specimens (hydrogen content CH = 0.4 mass ppm) and hydrogen-charged specimens (CH = 0.8 ~ 1.2 mass ppm) with a small artificial hole (diameter d = 50 or 100 μm, depth h = 100 μm) for bearing steel SUJ2. The Mode II fatigue growth rate of the hydrogen-charged specimens was about twice higher than that of the uncharged specimens. These results demonstrated that the new rolling contact fatigue testing was useful to investigate Mode II fatigue crack growth.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"18 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120899648","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

Prediction of Compressive Strength for Unidirectional Fiber Reinforced Plastics in Considering Effect of Strain-Rate Dependency on Mechanical Properties of Constituent Materials 考虑应变率对组成材料力学性能影响的单向纤维增强塑料抗压强度预测

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-10-17 DOI: 10.1299/KIKAIA.78.1284

N. Inoue, N. Taniguchi, T. Nishiwaki, N. Hirayama, K. Nakamura, Y. Arao, H. Kawada

{"title":"Prediction of Compressive Strength for Unidirectional Fiber Reinforced Plastics in Considering Effect of Strain-Rate Dependency on Mechanical Properties of Constituent Materials","authors":"N. Inoue, N. Taniguchi, T. Nishiwaki, N. Hirayama, K. Nakamura, Y. Arao, H. Kawada","doi":"10.1299/KIKAIA.78.1284","DOIUrl":"https://doi.org/10.1299/KIKAIA.78.1284","url":null,"abstract":"This study presents an analytical model to predict compressive strength of unidirectional FRP. Proposed model considers the effect of strain-rate dependency on mechanical properties of constituent materials. The model is based on the elastic foundation model and the microbuckling model of fiber which has initial misalignment in matrix. Compressive deformation of unidirectional FRP is considered by dividing into fiber microbuckling region and plastic kinking region. Additionally, to take into consideration the change in compressive deformation mode accompanying fiber volume fraction or fiber microbuckling, A mode function is introduced. The predictions from the proposed model are compared with experimental results of unidirectional E-glass/Epoxy and T700SC/Epoxy evaluated by using the conventional split Hopkinson pressure bar method. Incorporating strain-rate dependency on compressive modulus of reinforcement calculated from composite mixture law, the predictions are found to be in good agreement with experimental results of strain-rate dependency on compressive strength. Accuracy of the prediction is improved by changing the mode function.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121018291","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

Shrinkage characteristics of light-cured composite resin 光固化复合树脂的收缩特性

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-10-17 DOI: 10.1299/KIKAIA.78.1377

K. Arakawa

引用次数: 0

Dislocation-based crystal plasticity modeling and simulation for HCP metals considering evolution of twin-microstructure 考虑孪晶组织演化的HCP金属位错晶体塑性建模与仿真

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-09-13 DOI: 10.1299/KIKAIA.78.1157

R. Kondo, Y. Tadano, K. Shizawa

{"title":"Dislocation-based crystal plasticity modeling and simulation for HCP metals considering evolution of twin-microstructure","authors":"R. Kondo, Y. Tadano, K. Shizawa","doi":"10.1299/KIKAIA.78.1157","DOIUrl":"https://doi.org/10.1299/KIKAIA.78.1157","url":null,"abstract":"In this study, a dislocation-based crystal plasticity model for HCP crystals considering evolution of twin-microstructure is newly developed. In order to represent an anisotropic glide of dislocation in HCP crystals, a conventional dislocation-crystal plasticity model for FCC crystals is extended to that for HCP one. Additionally, a new deformation twining model based on the phase-field theory is coupled with the above model through an order parameter and resolved shear stress. In this model, elastic strain energy on twin plane and anisotropic interfacial energy between matrix and twinned region are adopted in the Ginzburg-Landau free energy as the bulk energy and the gradient energy, respectively. Using the above models, uniaxial compression tests under plane strain condition for Mg single crystal with different crystal orientations are demonstrated by means of FEM for dislocation-based crystal plasticity analyses coupling with FDM for phase-field one. From the results of the present simulations, it is shown that the present model can reproduce an anisotropic plastic behavior of Mg single crystal. Moreover, lenticular shaped twins as reported in many experimental studies are reproduced by a-axis compression tests.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133653250","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

静的引張試験による疲労荷重下における[0m/90n]sクロスプライCFRP積層板に生じるトランスバースクラックの発生予測静态拉伸试验在疲劳负荷下，预测在[0m/90n]s交叉CFRP积层板上发生转板断裂

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-08-06 DOI: 10.1299/KIKAIA.78.1000

A. Hosoi, Keigo Takamura, N. Sato, H. Kawada

引用次数: 5