Characterization of the creep interaction effect for twin semi-elliptical surface cracks under combined tension and bending loading

• Published in: Engineering fracture mechanics Vol. 192; pp. 148 - 162
• Main Authors: Xu, Lianyong, Zhao, Lei, Jing, Hongyang, Han, Yongdian
• Format: Journal Article
• Language: English
• Published: New York Elsevier Ltd 01.04.2018; Elsevier BV
• Subjects: Bending stresses; Combination rule; Combined tension and bending; Crack growth; Crack propagation; Creep regime; Materials creep; Multiple cracks interaction; Studies; Surface cracks; Combined tension and bending; Multiple cracks interaction; Combination rule; Creep regime; Crack growth
• ISSN: 0013-7944; 1873-7315
• DOI: 10.1016/j.engfracmech.2018.02.018

•Multiple cracks interaction analyses under complex load is examined.•Creep interaction induced by crack geometries and loading condition is discussed.•Creep interaction factor for tension is higher than bending or combined mode.•A higher value of creep interaction factor is permitted for multiple cracks. The interaction of twin semi-elliptical surface cracks subjected to combined tension and bending in the creep regime is studied. Moreover, the crack growth behavior in the presence of multiple cracks is simulated to reveal the effect of creep interaction factor. The tension load produces a larger creep interaction factor than those for pure bending and combined tension and bending. For the combination of cracks, a greater value of the creep interaction factor is permitted compared with the linear-elastic condition. The enhancement of creep crack growth rate in multiple cracks is diminished as the improvement of creep interaction factor is lower than 30%.