Elastic-Plastic Fracture Mechanics Study of Tribology Problems.

摩擦学问题的弹塑性断裂力学研究。

• 批准号: 02452101
• 负责人: MURAKAMI Yukitaka
• 金额: $ 4.42万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452101/
• 关键词: Tribology; Fracture Mechanics; Finite Element Method; body Force Method; Elastic-Plastic Analysis; Elastic-Perfectly Plastic Material; Isotropic Hardening Rule; Kinematic Hardening Rule; 接触荷重; 残留応力

The elastic-plastic behavior of the subsurface layer under cyclic rolling-sliding contact loading is analyzed by the combination method (BFM+FEM) of the body force method(BFM) and the finite element method(FEM). Comparison between the amount of forward flow obtained numerically and the experimental measurements on a medium carbon steel shows that the material under the cyclic contact loading obeys the intermediate role of the isotropic hardening rule(IHR) and the kinematic hardening rule(KHR). The residual stresses and incremental cyclic plastic strains are also analyzed to investigate the easiness of crack initiation for driver and follower surface.In order to study the growth mechanism of surface crack ; pits and spall, on lubricated rolling-sliding contact surface, comouting programs for the analysis of cracks with curved and crossed planes were developed. In the numerical analysis, the Non-Hertzian loadings caused by surface roughness were considered. The effects of the contact of crack surfaces and friction between crack surfaces under compressive loading were also investigated.Considering the results of the crack initiation and growth analysis, it is concluded that the crack propagation condition is more crucial than the crack initiation condition as the cause of a pit formation under lubricated rolling-sliding contact loading.The importance of the mode II type crack growth in the early stage of crack propagation was pointed out and a new experimental method to measure the threshold stress intensity factor range for shear mode fatigue crack growth DELTAKtau_<th> was proposed.

采用体力法（BFM）与有限元法（FEM）相结合的方法（BFM+FEM）对循环滚滑接触荷载作用下地下层的弹塑性行为进行了分析。将数值计算得到的前进流量与中碳钢的实验测量结果进行比较表明，循环接触载荷下的材料服从各向同性硬化法则（IHR）和运动硬化法则（KHR）的中间作用。还分析了残余应力和增量循环塑性应变，以研究驱动器和从动件表面裂纹萌生的难易程度。为了研究表面裂纹的扩展机制；开发了润滑滚动滑动接触面上的凹坑和剥落、曲面和交叉面裂纹分析的计算程序。在数值分析中，考虑了由表面粗糙度引起的非赫兹载荷。还研究了压缩载荷下裂纹表面接触和裂纹表面之间摩擦的影响。考虑到裂纹萌生和扩展分析的结果，得出的结论是，裂纹扩展条件比裂纹萌生条件更重要。润滑滚动滑动接触载荷下凹坑形成的研究。指出了裂纹扩展早期II型裂纹扩展的重要性，并提出了测量剪切模式疲劳裂纹扩展阈值应力强度因子范围的新实验方法已提议 DELTAKtau_<th>。

项目成果

K.コウカソクAdvanced in Engineering Tribology,The Society of Tribologists and Lubrication Engineering.Edited by YipーWah Ching and Herbert S.Cheng.

K. Koukasoku 高级工程摩擦学，摩擦学家和润滑工程学会。由 Yip-Wah Ching 和 Herbert S.Cheng 编辑。

Y. Murakami, C. Sakae, K. Ichimaru and T. Morita: "Elasto-Plastic Analysis of Subsurface Layer Under Cyclic Rolling-Sliding Contact Loading." JSME, Trans.56-527. 1926-1934 (1990)

Y. Murakami、C. Sakae、K. Ichimaru 和 T. Morita：“循环滚动滑动接触载荷下地下层的弹塑性分析”。

村上 敬宜,栄 中,市丸 和徳,森田 健敬: "転がり接触荷重を受ける表面層の弾塑性挙動解析" 日本機械学会論文集(C編). 56. 1926-1934 (1990)

Takayoshi Murakami、Sakae Naka、Kazunori Ichimaru、Kenji Morita：“滚动接触载荷下表面层的弹塑性行为分析”日本机械工程师学会汇刊（ed.C）56。1926-1934（1990）。

C.Sakae and Y.Murakami.: "Elastic-Plastic Analysis of Subsurface Layer under Reversed Rolling-Sliding Contact Loading." Proceedings of the Japan Congress on Materials Research.

C.Sakae 和 Y.Murakami.：“反向滚动滑动接触载荷下地下层的弹塑性分析”。

Y.Murakami,C.Sakae,M.Kaneta and K.Ichimaru.: "Elastic-Plastic Analysis of Subsurface Layer under Rolling-Sliding Contact Loading and Pit Formation Mechanism." Advanced in Engineering Tribology,The Society of Tribologists and Lubrication Engineering,. 71-8

Y.Murakami、C.Sakae、M.Kaneta 和 K.Ichimaru.：“滚动滑动接触载荷下地下层的弹塑性分析和凹坑形成机制”。