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1. Theoretic Life Solutions of Cylindrical Sample Under Shear Strain | |||
XIAO Jianhua,WANG Jingjing | |||
Mechanics 13 December 2013 | |||
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Abstract:For given boundary condition and motion equations, the theoretic solutions of displacement and stresses for simple one directional macro rheology deformation of cylindrical sample under long time loading condition are the topic for this work. The material features are defined by elastic constants and viscosity constants as a general elastic-flow material. The time-evolution solutions are obtained to answer the intrinsic features of rheology deformation under the condition that in macro scale, the deformation is one directional. These new results are used to explain the fatigue and cracking development phenomenon in typical engineering environments. The research shows that: 1) The fatigue and cracking are originated from the self-evolution of deformation as a rheology deformation; 2) The fatigue and cracking have different mechanism. The compressive cracking is similar with fatigue, while the extension cracking is not; 3) The fatigue or cracking feature of material is described by viscosity parameter. A natural life scale of material can be defined as the ratio of viscosity over elasticity. 4) The viscosity parameter measurements can be used to estimate life of material or to estimate the potential instability. | |||
TO cite this article:XIAO Jianhua,WANG Jingjing. Theoretic Life Solutions of Cylindrical Sample Under Shear Strain[OL].[13 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4574815 |
2. The study of the fatigue crack propagation threshold based on the maximum stress intensity factor | |||
Meng Zhaoxin,Zhang Jiazhen | |||
Mechanics 29 September 2005 | |||
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Abstract:In situ SEM observations have revealed that fatigue crack propagation is caused by the shear band decohesion around the crack tip and the formation and cracking of the shear band is mainly caused by the plasticity generated in the loading part of a load cycle. Based on the crack tip plasticity a theoretical analysis has been performed and a model has been set up to consider the effect of the applied stress ratio on fatigue crack propagation threshold. The obtained results have been compared with published test data and good agreement has been achieved. This method is very easy to use and no fatigue crack closure measurement is needed, therefore this model is significant in engineering application. | |||
TO cite this article:Meng Zhaoxin,Zhang Jiazhen. The study of the fatigue crack propagation threshold based on the maximum stress intensity factor[OL].[29 September 2005] http://en.paper.edu.cn/en_releasepaper/content/3073 |
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