Analysis of the Stress Invariants Criterions for I-II Mixed Mode Crack Initiation Angles
Crack propagation in practical engineering problems is often of mixed-mode type. The analysis of mixed-mode I–II crack initiation angles under different loading conditions is presented using stress invariants criteria. Where I1 and I2 are the first and the second stress invariants, IP-criterion postulates that crack will propagate along the direction defined by a maximum value of IP along the elastic–plastic boundary defined by von Mises. The mixed-mode I-II crack initiation angle is predicted successfully and is agree well with experimental data.
Zhengyi Jiang and Chunliang Zhang
D. X. Li and Y. Z. Zhu, "Analysis of the Stress Invariants Criterions for I-II Mixed Mode Crack Initiation Angles", Advanced Materials Research, Vols. 97-101, pp. 1194-1197, 2010