中国物理B ›› 2014, Vol. 23 ›› Issue (6): 64601-064601.doi: 10.1088/1674-1056/23/6/064601
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
钟志鹏a, 何郁波b, 万水a
Zhong Zhi-Peng (钟志鹏)a, He Yu-Bo (何郁波)b, Wan Shui (万水)a
摘要: A new node-pairs contact algorithm is proposed to deal with a composite material or bi-material interface crack face contact and friction problem (e.g., resistant coating and thermal barrier coatings) subjected to complicated load conditions. To decrease the calculation scale and calculation errors, the local Lagrange multipliers are solved only on a pair of contact nodes using the Jacobi iteration method, and the constraint modification of the tangential multipliers are required. After the calculation of the present node-pairs Lagrange multiplier, it is turned to next contact node-pairs until all node-pairs have finished. Compared with an ordinary contact algorithm, the new local node-pairs contact algorithm is allowed a more precise element on the contact face without the stiffness matrix singularity. The stress intensity factors (SIFs) and the contact region of an infinite plate central crack are calculated and show good agreement with those in the literature. The contact zone near the crack tip as well as its influence on singularity of stress fields are studied. Furthermore, the frictional contacts are also considered and found to have a significant influence on the SIFs. The normalized mode-Ⅱ stress intensity factors ??? for the friction coefficient decrease by 16% when f changes from 1 to 0.
中图分类号: (Fracture mechanics, fatigue and cracks)