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A new damage variable for low-cycle fatigue of metallic materials

โœ Scribed by Cheng Guang-Xu; Lou Zhi-Wen; Kuang Zhen-Bang

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
540 KB
Volume
48
Category
Article
ISSN
0013-7944

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โœฆ Synopsis

Experimental results show that the inherent ductility in a material is deflected after cycle loading. Based on the concept of ductility deflection, a new fatigue damage variable D* for low-cycle fatigue is recommended in this paper. This new damage variable D* has definite physical meaning and can be measured with a simple experimental procedure. It can be connected directly with the usual mechanical properties of materials. D* increases slowly at the initial stage of cycle loading, but it increases rapidly after a definite cycle where the macroscale crack is formed. We define the turning point on the De-N curve as the critical damage value D$ and its corresponding cycle number N is the fatigue life N,.

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