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- 1970-1-1
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发表于 2006-5-11 23:59:02
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来自 天津
以往 ,橡胶疲劳 研究主要集中于单轴疲劳 性能,对于其多轴性能的研究国外开展的较少,最近由Mars、Sainter对天然橡胶在多轴循环下的疲劳性能展开了系统的研究。在此,奉献一篇Saintier的文章,希望大家对橡胶多轴疲劳性能多加关注:)
N. Saintier a,b,*, G. Cailletaud b, R. Piques
Abstract
This study deals with the fatigue crack initiation under multiaxial non-proportional loadings in a natural rubber. Push–pull, torsion and tensioncompression
with a superimposed static torsion fatigue test results are presented. A short presentation of some important features concerning short
fatigue crack growth is given. Two fatigue crack criteria are proposed, the first one based on the first and second invariant of the Cauchy stress
tensor, the second, based on the micromechanisms of crack initiation, consist of a critical plane approach under large strain conditions using a
micro to macro approach. The second criterion was found to give the best results, by predicting the fatigue lifes, crack orientations and location,
even in cases with internal crack initiation. |
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