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Based on the nonlinear continuum damage model(CDM) developed by Chaboche,a modified model for high cycle fatigue of TC4 alloy was proposed.Unsymmetrical cycle fatigue tests were conducted on rod specimens at room temperature.Then the material parameters needed in the CDM were obtained by the fatigue tests,and the stress distribution of the specimen was calculated by FE method.Compared with the linear damage model(LDM),the damage results and the life prediction of the CDM show a better agreement with the test and they are more precise than the LDM.By applying the CDM developed in this study to the life prediction of aeroengine blades,it is concluded that the root is the most dangerous region of the whole blade and the shortest life is 58 211 cycles.Finally,the Cox proportional hazard model of survival analysis was applied to the analysis of the fatigue reliability.The Cox model takes the covariates into consideration,which include diameter,weight,mean stress and tensile strength.The result shows that the mean stress is the only factor that accelerates the fracture process. 相似文献
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一、课前准备播放视频《中国军事实力》吸引学生的无意注意,创设教学情境,使学生理解军强离不开国强,国强得益于改革开放政策,从而激发学生强烈的求知欲、探究新知识的热情。二、新课学习1.关于经济体制改革解决＂是什么＂的问题。 相似文献
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为实现培养创新型、应用型人才目标,提出了创新实践教学平台的层次化结构。该层次化结构包括两个含义,一是基础实践—专业实践—科技创新三个层次实践教学平台,二是在同一个实践教学平台内又分为难度不同的实验项目或创新项目。通过该平台逐步提升学生的创新实践能力,体现"做中学,学中做"的思想。 相似文献
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