Does the cyclic J-integral ΔJ describe the crack-tip opening displacement in the presence of crack closure?
Does the cyclic J-integral ΔJ describe the crack-tip opening displacement in the presence of crack closure?
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DOI：
10.1016/j.engfracmech.2014.07.017
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发表时间：
2015
影响因子：
5.4
通讯作者：
M. Metzger;T. Seifert;C. Schweizer
中科院分区：
文献类型：
--
作者：
M. Metzger;T. Seifert;C. Schweizer
本文研究了裂纹闭合时循环J积分Δ J与裂纹尖端张开位移Δ CTOD之间的关系，以探讨在这种情况下Δ J是否能描述裂纹尖端张开位移的问题。为此，开发了一种在有限元计算中数值计算Δ J的方法。该方法是有效的弹塑性材料，表现出Masing行为。在包括裂纹闭合的全塑性循环条件下，考虑了不同的应变范围和应变比。它表明，循环J积分是参数，以确定循环裂纹尖端张开位移，即使在裂纹闭合的情况下，存在。
In this paper, the correlation of the cyclic J-integral, Δ J, and the cyclic crack-tip opening displacement, Δ CTOD, is studied in the presence of crack closure to assess the question if Δ J describes the crack-tip opening displacement in this case. To this end, a method is developed to evaluate Δ J numerically within finite-element calculations. The method is validated for an elastic–plastic material that exhibits Masing behavior. Different strain ranges and strain ratios are considered under fully plastic cyclic conditions including crack closure. It is shown that the cyclic J-integral is the parameter to determine the cyclic crack-tip opening displacement even in cases where crack closure is present.