Pub Date : 2015-11-27DOI: 10.1299/TRANSJSME.14-00630
Yoshiki Kawano, N. Tamaru, S. Ishii, T. Mayama, Ryouji Kondou, T. Ohashi
Deformation behaviors of polycrystalline metals are quite complex, and we are not easy to directly investigate them; thus, analyses employing simple models such as bicrystals are required. In this study, we conducted crystal plasticity analysis of unidirectional tensile tests, using compatible-symmetric-type bicrystal models with the not-inclined grain boundary and incompatible-type bicrystal model with the inclined grain boundary; we investigated changes in patterns of geometrically necessary dislocation (GND) bans and the density of GNDs in the initial deformation. In the condition where the grain boundary contacted with the constrained faces, GND bans were formed and the distribution was changed with changing the inclination angle α of the grain boundary. In contrast, GNDs were not localized in high density in the condition where the grain boundary contacted with the free surfaces; the changes were caused by two-reasons: one was changes of compatibility of the bicrystal model with changing the inclination angle α, and the other was that deformation shapes of the bicrystal model under tensile loading were changed with changing the inclination angle α and the deformation was constrained by the constrained faces. The compatibility of and average density of GNDs in the bicrystal model could be estimated using differences of components of Schmid tensors between the crystal grains.
{"title":"Grain boundary inclination dependence of GN dislocation patterns and density in bicrystal model","authors":"Yoshiki Kawano, N. Tamaru, S. Ishii, T. Mayama, Ryouji Kondou, T. Ohashi","doi":"10.1299/TRANSJSME.14-00630","DOIUrl":"https://doi.org/10.1299/TRANSJSME.14-00630","url":null,"abstract":"Deformation behaviors of polycrystalline metals are quite complex, and we are not easy to directly investigate them; thus, analyses employing simple models such as bicrystals are required. In this study, we conducted crystal plasticity analysis of unidirectional tensile tests, using compatible-symmetric-type bicrystal models with the not-inclined grain boundary and incompatible-type bicrystal model with the inclined grain boundary; we investigated changes in patterns of geometrically necessary dislocation (GND) bans and the density of GNDs in the initial deformation. In the condition where the grain boundary contacted with the constrained faces, GND bans were formed and the distribution was changed with changing the inclination angle α of the grain boundary. In contrast, GNDs were not localized in high density in the condition where the grain boundary contacted with the free surfaces; the changes were caused by two-reasons: one was changes of compatibility of the bicrystal model with changing the inclination angle α, and the other was that deformation shapes of the bicrystal model under tensile loading were changed with changing the inclination angle α and the deformation was constrained by the constrained faces. The compatibility of and average density of GNDs in the bicrystal model could be estimated using differences of components of Schmid tensors between the crystal grains.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132409466","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}
Pub Date : 2015-08-05DOI: 10.1299/TRANSJSME.15-00187
光佑 池田
{"title":"高温場に挿入されたポリエチレンフィルムの着火・燃焼特性（第1報：着火遅れ時間，燃焼時間に及ぼすフィルム寸法の影響）","authors":"光佑 池田","doi":"10.1299/TRANSJSME.15-00187","DOIUrl":"https://doi.org/10.1299/TRANSJSME.15-00187","url":null,"abstract":"","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122567569","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}
Pub Date : 2015-03-20DOI: 10.1299/JSMEKANTO.2015.21._20102-1_
Yuto Shimizu, M. Arai, T. Suidzu
{"title":"20102 Damage Process of Ceramic Thermal Barrier Coatings Exposed at High Temperature under Tensile Loading","authors":"Yuto Shimizu, M. Arai, T. Suidzu","doi":"10.1299/JSMEKANTO.2015.21._20102-1_","DOIUrl":"https://doi.org/10.1299/JSMEKANTO.2015.21._20102-1_","url":null,"abstract":"","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132259596","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}
Pub Date : 2015-01-20DOI: 10.1299/TRANSJSME.14-00555
一登 背戸, 雄一 岩崎, 充弘 宮崎, 亨 渡辺
{"title":"長周期・大振幅地震動の測定を可能にする小型絶対変位振動計の開発研究（達成された成果について）","authors":"一登 背戸, 雄一 岩崎, 充弘 宮崎, 亨 渡辺","doi":"10.1299/TRANSJSME.14-00555","DOIUrl":"https://doi.org/10.1299/TRANSJSME.14-00555","url":null,"abstract":"","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133495660","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}
In order to develop more sensitive EBSD parameters to detect fatigue damage in austenitic stainless steel used as key material for nuclear reactor components, the new EBSD parameter focused on grain boundaries, which was referred to as the averaged grain boundary local misorientation (BMave), has been proposed by modifying the existing EBSD parameter of the averaged local misorientation (Mave). The applicability of the new parameter BMave to the fatigue damage detection was discussed by comparing with the exiting parameter Mave. As a result, it was found that BMave was more sensitive parameter than Mave. Especially, BMave (Option 1), which was calculated using the crystal orientations at points just adjacent to grain boundaries, was the most effective parameter for the fatigue damage detection.
{"title":"Detection of fatigue damage in stainless steel by EBSD analysis (analysis focused on grain boundaries)","authors":"M. Kuroda, M. Kamaya, Takayuki Mori, T. Izaki","doi":"10.1299/KIKAIA.79.1690","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.1690","url":null,"abstract":"In order to develop more sensitive EBSD parameters to detect fatigue damage in austenitic stainless steel used as key material for nuclear reactor components, the new EBSD parameter focused on grain boundaries, which was referred to as the averaged grain boundary local misorientation (BMave), has been proposed by modifying the existing EBSD parameter of the averaged local misorientation (Mave). The applicability of the new parameter BMave to the fatigue damage detection was discussed by comparing with the exiting parameter Mave. As a result, it was found that BMave was more sensitive parameter than Mave. Especially, BMave (Option 1), which was calculated using the crystal orientations at points just adjacent to grain boundaries, was the most effective parameter for the fatigue damage detection.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127242261","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}
N. Kubota, Kousuke Saito, Y. Hangai, T. Utsunomiya, T. Ishima, H. Kawashima, O. Kuwazuru, N. Yoshikawa
Porous aluminum is a lightweight material with high energy absorption properties. In this study, impact test of A1050-ADC12 functionally graded porous aluminum fabricated by friction stir processing (FSP) route was carried out. It was shown that deformation began from low strength A1050 layer and thereafter high strength ADC12 layer deformed. This result is consistent with the result of static compression test of A1050-ADC12 functionally graded porous aluminum. Consequently, it was shown that A1050-ADC12 functionally graded porous aluminum has the potential for its location of deformation to be controlled.
{"title":"Observation of the fracture behavior in A1050-ADC12 functionally graded porous aluminum under impact compression","authors":"N. Kubota, Kousuke Saito, Y. Hangai, T. Utsunomiya, T. Ishima, H. Kawashima, O. Kuwazuru, N. Yoshikawa","doi":"10.1299/KIKAIA.79.1076","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.1076","url":null,"abstract":"Porous aluminum is a lightweight material with high energy absorption properties. In this study, impact test of A1050-ADC12 functionally graded porous aluminum fabricated by friction stir processing (FSP) route was carried out. It was shown that deformation began from low strength A1050 layer and thereafter high strength ADC12 layer deformed. This result is consistent with the result of static compression test of A1050-ADC12 functionally graded porous aluminum. Consequently, it was shown that A1050-ADC12 functionally graded porous aluminum has the potential for its location of deformation to be controlled.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115016014","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}
In order to develop high-reliable maintenance systems to secure the structural integrity of reactor components, analytical and diagnostic techniques for the detection of fatigue damage should be developed further. In the present study, crystal orientation analysis and microstructural observation were performed for Type 316 austenitic stainless steel subjected to cyclic loading by electron backscatter diffraction (EBSD) and transmission electron microscope (TEM) to clarify the relationship between the changes in the crystal orientation and the microstructure introduced by fatigue cycles. As a result of the comparison between the EBSD analysis and the TEM observation, it was concluded that the change in the local misorientation identified by the EBSD analysis was due to the formation of the dislocation cell structures identified by the TEM observation.
{"title":"Detection of fatigue damage in stainless steel by EBSD analysis (comparison with TEM observation)","authors":"M. Kuroda, K. Yasunaga, M. Kamaya, Teruaki Yamada","doi":"10.1299/KIKAIA.79.1102","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.1102","url":null,"abstract":"In order to develop high-reliable maintenance systems to secure the structural integrity of reactor components, analytical and diagnostic techniques for the detection of fatigue damage should be developed further. In the present study, crystal orientation analysis and microstructural observation were performed for Type 316 austenitic stainless steel subjected to cyclic loading by electron backscatter diffraction (EBSD) and transmission electron microscope (TEM) to clarify the relationship between the changes in the crystal orientation and the microstructure introduced by fatigue cycles. As a result of the comparison between the EBSD analysis and the TEM observation, it was concluded that the change in the local misorientation identified by the EBSD analysis was due to the formation of the dislocation cell structures identified by the TEM observation.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128001958","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}
This study examined the shrinkage stress of a light-cured composite resin on cavity wall experimentally and analytically. The shrinkage force was measured using artificial cylindrical cavities fabricated in two stainless steel plates and a load-cell attached to the steel plate. An analytical model was introduced to evaluate the stress distribution in the cavities and to compare the shrinkage force experimentally determined, and following results were obtained: (1) The shrinkage force was dependent on both the cavity depth and irradiation time of the resin. (2) The analytical model can predict all the important features of the shrinkage force. (3) The stress on the cavity wall was dependent on the irradiation time.
{"title":"Stress analysis of a light-cured composite resin due to polymerization shrinkage","authors":"K. Arakawa, Sane Jae Yoon, M. Nishimura","doi":"10.1299/KIKAIA.79.1406","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.1406","url":null,"abstract":"This study examined the shrinkage stress of a light-cured composite resin on cavity wall experimentally and analytically. The shrinkage force was measured using artificial cylindrical cavities fabricated in two stainless steel plates and a load-cell attached to the steel plate. An analytical model was introduced to evaluate the stress distribution in the cavities and to compare the shrinkage force experimentally determined, and following results were obtained: (1) The shrinkage force was dependent on both the cavity depth and irradiation time of the resin. (2) The analytical model can predict all the important features of the shrinkage force. (3) The stress on the cavity wall was dependent on the irradiation time.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115673425","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}
In this paper, time-dependent dimensional change in quasi-isotropic laminates induced by relaxation of thermal residual stress and physical aging was predicted by the classical lamination theory. CFRP with pitch-based carbon fiber and cyanate ester resin was chosen for the study. Viscoelastic properties were investigated by performing tensile creep test for unidirectional laminates in the transverse direction. In addition, shrinkage strain induced by physical aging was studied by measuring the strain change of unidirectional laminates as well. Shrinkage strain in off–axis layers was calculated by using the coordinate-transform method. Shrinkage strain in 60° and 45° laminates were measured and the results were compared with the calculation. From the comparison, it was found that shrinkage strain of off-axis layers can be calculated by using the coordinate-transform method. Experimental results were applied to the classical theory in order to predict the time-dependent dimensional change of quasi-isotropic laminates. The strain change in quasi-isotropic laminates was obtained experimentally, and the result was compared with the prediction. It was verified that the time-dependent deformation of quasi-isotropic laminates can be predicted with a -order by using proposed prediction method.
{"title":"Time-dependent deformation of CFRP quasi-isotropic laminates caused by relaxation of thermal residual stress and physical aging","authors":"Tomoyuki Niwa, Y. Arao, H. Kawada","doi":"10.1299/KIKAIA.79.950","DOIUrl":"https://doi.org/10.1299/KIKAIA.79.950","url":null,"abstract":"In this paper, time-dependent dimensional change in quasi-isotropic laminates induced by relaxation of thermal residual stress and physical aging was predicted by the classical lamination theory. CFRP with pitch-based carbon fiber and cyanate ester resin was chosen for the study. Viscoelastic properties were investigated by performing tensile creep test for unidirectional laminates in the transverse direction. In addition, shrinkage strain induced by physical aging was studied by measuring the strain change of unidirectional laminates as well. Shrinkage strain in off–axis layers was calculated by using the coordinate-transform method. Shrinkage strain in 60° and 45° laminates were measured and the results were compared with the calculation. From the comparison, it was found that shrinkage strain of off-axis layers can be calculated by using the coordinate-transform method. Experimental results were applied to the classical theory in order to predict the time-dependent dimensional change of quasi-isotropic laminates. The strain change in quasi-isotropic laminates was obtained experimentally, and the result was compared with the prediction. It was verified that the time-dependent deformation of quasi-isotropic laminates can be predicted with a -order by using proposed prediction method.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"14 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":"125357187","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}
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