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首页> 外文期刊>Engineering Fracture Mechanics >Prediction of crack opening stress for part-through cracks and its verification using a modified strip-yield model
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Prediction of crack opening stress for part-through cracks and its verification using a modified strip-yield model

机译：部分贯通裂纹的开裂应力预测及其修正带屈服模型的验证

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摘要

Newman's crack opening stress equation [Newman JC. Jr. A crack opening stress equation for fatigue crack growth. Int. J. Fract. 1984;24:R131-R135] was extended to predict the crack opening stress of part-through cracks within a finite body. The extended equation was obtained by replacing the normalized maximum applied stress S{sub}(max)/σ{sub}0 as the normalized stress intensity factor (SIF) K{sub}(max)/K{sub}0, where K{sub}(max) is the SIF including the geometry correction factor F, and K{sub}0 is the stress intensity factor for flow stress. In order to verify the crack opening stress obtained from the extended equation, the modified strip-yield model using a slice synthesis technique [Daniewicz SR. A modified strip-yield model for prediction of plasticity-induced closure in surface flaws. Fatigue Fract. Engug. Mater. Struct. 1998;21:885-901.] was utilized and the approximate weight function was modified to consider the effect of the restraint due to the uncracked area. For a corner crack or surface crack within a finite body, the crack opening stresses obtained from this model were correlated well with the results of the extended equation. Additionally, the crack shape evolutions of surface crack subjected to uniaxial constant amplitude loading or four-point bending loading were predicted by the extended crack opening stress equation and compared with experimental data for aluminium alloy specimens with R = 0.1. The predictions were in good agreements with experimental data.
机译：纽曼的开裂应力方程[纽曼JC。 Jr.疲劳裂纹扩展的开裂应力方程。诠释J.分形1984; 24：R131-R135]被扩展以预测有限体内的部分贯通裂纹的开裂应力。通过将归一化的最大外加应力S {sub}（max）/σ{sub} 0替换为归一化应力强度因子（SIF）K {sub}（max）/ K {sub} 0来获得扩展方程。 {sub}（max）是包括几何校正因子F的SIF，而K {sub} 0是流动应力的应力强度因子。为了验证从扩展方程获得的裂纹张开应力，使用切片合成技术[Daniewicz SR。一种改进的带材屈服模型，用于预测表面缺陷中塑性诱导的闭合。疲劳分形。 gu。母校结构。 1998; 21：885-901。]，并对近似权重函数进行了修改，以考虑由于未破裂区域而产生的约束效果。对于有限体内的角裂纹或表面裂纹，从该模型获得的裂纹张开应力与扩展方程的结果很好地相关。此外，通过扩展的开裂应力方程预测了单轴恒定振幅载荷或四点弯曲载荷下表面裂纹的裂纹形状演变，并与R = 0.1的铝合金试样的实验数据进行了比较。这些预测与实验数据吻合良好。

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