Analysis of crack opening stresses for center- and edge-crack tension specimens

作者：Tong Di Hua; Wu Xue Ren^*

来源：Chinese Journal of Aeronautics, 2014, 27(2): 291-298.

DOI：10.1016/j.cja.2013.07.007

• Center- and edge-crack
• Crack closure
• Crack opening stresses
• Crack surface displacements
• Weight function method

Accurate determination of crack opening stress is of central importance to fatigue crack growth analysis and life prediction based on the crack-closure model. This paper studies the crack opening behavior for center-and edge-crack tension specimens. It is found that the crack opening stress is affected by the crack tip element. By taking the crack tip element into account, a modified crack opening stress equation is given for the center-crack tension specimen. Crack surface displacement equations for an edge crack in a semi-infinite plate under remote uniform tension and partially distributed pressure are derived by using the weight function method. Based on these displacements, a crack opening stress equation for an edge crack in a semi-infinite plate under uniform tension has been developed. The study shows that the crack opening stress is geometry-dependent, and the weight function method provides an effective and reliable tool to deal with such geometry dependence.

• 出版日期2014-4
• 单位中国航发北京航空材料研究院