Multiaxial fatigue life prediction method based on path-dependent cycle counting under tension/torsion random loading

作者：Chen H; Shang D G^*; Liu E T

来源：Fatigue and Fracture of Engineering Materials and Structures, 2011, 34(10): 782-791.

DOI：10.1111/j.1460-2695.2011.01572.x

• cycle counting
• fatigue damage
• life prediction
• multiaxial fatigue

A path-dependent cycle counting method is proposed by applying the distance formula between two points on the tension-shear equivalent strain plane for the identified half-cycles first. The Shang-Wang multiaxial fatigue damage model for an identified half-cycle and Miner's linear accumulation damage rule are used to calculate cumulative fatigue damage. Therefore, a multiaxial fatigue life prediction procedure is presented to predict conveniently fatigue life under a given tension and torsion random loading time history. The proposed method is evaluated by experimental data from tests on cylindrical thin-walled tubes specimens of En15R steel subjected to combined tension/torsion random loading, and the prediction results of the proposed method are compared with those of the Wang-Brown method. The results showed that both methods provided satisfactory prediction.

• 出版日期2011-10
• 单位北京工业大学