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您的检索式：作者名="Ryosuke MURAI"
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| 1 | Fatigue and fracture behavior of nickel-based superalloy Inconel 718 up to the very high cycle regime显示文摘The fatigue and fracture behavior of nickel-based superalloy Inconel 718 was investigated up to the very high cycle regime under rotary bending tests at room temperature. It was found that this superalloy can still fracture after exceeding 107 cycles. Fractographic analysis revealed that there was a transition from fatigue crack initiation at multi-sites to single initiation with decreasing stress levels. The fracture surface can be divided into four areas according to the appearance, associated with fracture mechanics analysis of the corresponding stress intensity factors. The fracture mechanism dominant in each area was disclosed by scanning electron microscope examination and analyzed in comparison with those obtained from the crack growth tests. Subsequently, life prediction modeling was proposed by estimating the crack initiation and propagation stage respectively. It was found that Chan (2003)'s model for initiation life and the Paris law for growth life can provide comparable predictions against the experimental life. | Xian-feng MA Zheng DUAN Hui-ji SHI Ryosuke MURAI Eiichi YANAGISAWA | 2010 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2010，11，10： | 9 |
| 2 | Gigacycle fatigue behaviors of two SNCM439 steels with different tensile strengthes显示文摘Gigacycle fatigue behaviors of two SNCM439 steels with different tensile strengthes were experimentally studied by rotating bending tests,to investigate the effects of the tensile strength obtained by different heat treatment processes on very high cycle fatigue failure mechanisms.The material with higher tensile strength of 1 710 MPa exhibited typical gigacycle fatigue failure characteristics,whereas one with lower tensile strength of 1 010 MPa showed only traditional fatigue limit during the tests and no gigacycle failure could be found even when the specimen ran up to more than 10 8 cycles.Metallographic and fractographic analysis were carried out by an optical microscope (OM) and scanning electron microscope (SEM).It showed two different crack initiation mechanisms that for the specimen with lower tensile strength the crack prefers surface initiation and for that with higher strength the crack initiates from subsurface inclusions revealed by a fish-eye like microstructure. | Zheng Duan Xian-Feng Ma Hui-Ji Shi Ryosuke Murai Eiichi Yanagisawa | 2011 | Acta Mechanica Sinica2011，27，5： | 1 |
| 3 | Luminescence enhancement of Eu 2+ , Ce 3+ co-doped Ba 3 Si 5 O 13?δ N δ phosphors显示文摘 | Ruili Zhang Tomonori Maeda Ryosuke Maruta Sho Kusaka Bingjun Ding Kei-ichiro Murai Toshihiro Moriga | 2009 | Journal of Solid State Chemistry2009，，3： | 1 |
| 4 | SnPb焊点结构的高周疲劳行为检测与寿命表征方法显示文摘本文对SMT型的SnPb焊点结构(PC基板-SnPb焊料-陶瓷电阻结构)的高周疲劳(2×104~1×106循环次数)失效行为进行了扫描电子显微镜(SEM)原位观测试验和有限元分析.这些结果表明:SMT型SnPb焊点结构的高周疲劳裂纹主要发生在SnPb焊料与陶瓷电阻结合处(趾或踵toeorheel),而高周疲劳裂纹扩展主要在SnPb焊料表面或内部,表面疲劳裂纹扩展方向随基板上施加的应力增大而偏向基板一侧.同时,这些裂纹扩展长度与焊点几何形状相关,一般扩展长度在150μm以内并因为焊料与电阻或焊料与基板的界面开裂出现停顿.此外,用ABAQUS软件分析了基板上外加应力与焊料上响应应力间的比例关系.基于试验和有限元分析计算比较,试验中发现的裂纹萌生源及裂纹扩展方向均与有限元计算得到的最大应力或最大应变集中区域相一致.最后,提出了简便预测这类结构的高周疲劳寿命方法,且预测结果与试验结果吻合较好. | 王习术 阎成琨 Murai Ryosuke 赵海燕 | 2009 | 南京大学学报(自然科学版)2009，45，2： | 1 |
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