A notch multiaxial-fatigue approach based on damage mechanics

被引:56
作者
Brighenti, Roberto [1 ]
Carpinteri, Andrea [1 ]
机构
[1] Univ Parma, Dept Civil Environm Engn & Architecture, I-43100 Parma, Italy
关键词
Multiaxial notch fatigue; Damage mechanics; Genetic algorithm; Cyclic multiaxial loading; Random multiaxial loading; PRINCIPAL STRESS DIRECTIONS; GENETIC ALGORITHM; STRENGTH; OPTIMIZATION; CRITERION; LIFE;
D O I
10.1016/j.ijfatigue.2011.02.003
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The fatigue assessment of structural components under complex multiaxial stresses (cyclic or random stress histories) can be conveniently tackled by means of damage mechanics concepts. In the present paper. a model for notch fatigue damage evaluation in the case of an arbitrary multiaxial loading history is proposed by using an endurance function which quantifies the damage accumulation in the material up to the final failure. The material collapse can be assumed to occur when the damage is complete, that is, when the parameter D reaches the unity. In the case of notched structural components, such a damage parameter D must be evaluated by taking into account the stress value as well as the gradient effect at the notch root. The proposed model, which also employs the stress invariants and the deviatoric stress invariants to quantify the damage phenomenon, is calibrated through a Genetic Algorithm once experimental data on the fatigue behaviour of the material being examined are known for some uniaxial or complex stress histories. The model presents the advantages to be mechanically based and to not require any evaluation of a critical plane and any loading cycle counting algorithm to determine the fatigue life. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:122 / 133
页数:12
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