Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth.
Interacting Effects Induced by Two Neighboring Pits Considering Relative Position Parameters and Pit Depth.
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考虑相对位置参数和凹坑深度的两个相邻凹坑引起的相互作用效应
DOI：
10.3390/ma10040398
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发表时间：
2017-04-09
期刊：
影响因子：
--
通讯作者：
Chen L
中科院分区：
文献类型：
--
作者：
Huang Y;Gang T;Chen L
针对预腐蚀铝合金7075-T6，考虑不同的相对位置参数（倾角θ和无量纲间距参数λ）和凹坑深度（d），采用有限元方法综合分析了两相邻凹坑的相互作用对应力集中的影响。根据应力集中的严重程度，分别确定了相交凹坑和相邻凹坑的疲劳损伤敏感区。提出了一种简单的方法来保守估计两个相邻凹坑引起的联合应力集中系数，并给出了一个具体的应用实例。结果表明，对于相交凹坑，归一化应力集中系数Ktnor随θ和λ的增大而增大，且在θ= 90°处达到最大值;而对于相邻凹坑，归一化应力集中系数Ktnor随λ的增大而减小，且最大值出现在稍不对称的位置。模拟结果表明，在相交和相邻情况下，Ktnor分别与无量纲深度参数Rd呈线性和指数关系.
For pre-corroded aluminum alloy 7075-T6, the interacting effects of two neighboring pits on the stress concentration are comprehensively analyzed by considering various relative position parameters (inclination angleθand dimensionless spacing parameterλ) and pit depth (d) with the finite element method. According to the severity of the stress concentration, the critical corrosion regions, bearing high susceptibility to fatigue damage, are determined for intersecting and adjacent pits, respectively. A straightforward approach is accordingly proposed to conservatively estimate the combined stress concentration factor induced by two neighboring pits, and a concrete application example is presented. It is found that for intersecting pits, the normalized stress concentration factorKtnorincreases with the increase ofθandλand always reaches its maximum atθ= 90°, yet for adjacent pits,Ktnordecreases with the increase ofλand the maximum value appears at a slight asymmetric location. The simulations reveal thatKtnorfollows a linear and an exponential relationship with the dimensionless depth parameterRdfor intersecting and adjacent cases, respectively.
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