Interacting Effects of Internal Defects and Corrosion Pits on the Stress Concentration of Hourglass-Shaped Specimens
Interacting Effects of Internal Defects and Corrosion Pits on the Stress Concentration of Hourglass-Shaped Specimens
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内部缺陷和腐蚀坑的相互作用对沙漏形试件应力集中的影响
DOI：
10.1007/s11668-019-00682-2
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发表时间：
2019-07
影响因子：
1.2
通讯作者：
Guo Weimin
中科院分区：
文献类型：
--
作者：
Liu Long;Hou Nan;Ding Ning;Guo Weimin
通过有限元方法研究了内部缺陷和腐蚀坑对沙漏形试件应力集中系数的影响。进行了高周疲劳试验，以确定内部缺陷的形状和腐蚀坑的深度。在实验观察的基础上，建立了一系列包含内部孔洞和腐蚀坑的三维模型。得到了单轴拉伸载荷下内部孔洞和腐蚀坑周围的应力分布。基于有限元分析，发现缺陷周围的应力集中系数完全依赖于内部孔洞和腐蚀坑的结构参数。对于具有单一腐蚀坑的模型，应力集中系数随着深度与长度比Rd的增加而增加。对于具有单一内部孔洞的模型，当内部孔洞靠近表面时，应力集中系数显著增加。对于既有内部孔洞又有腐蚀坑的模型，距离半径比(D2−h)/a和深度长度比Rd的参数对应力分布有重要影响。当参数(D2−h)/a<； 2时会出现严重的应力集中。对于深腐蚀坑(即Rd≥ 1)，应力集中系数由两部分决定，这两部分分别由(D2−h)/a和Rd参数决定。对于浅腐蚀坑(即Rd<； 1)，应力集中系数主要由(D2−h)/a和Rd的相互作用决定。两个非常接近的腐蚀坑和孔洞最有可能是起始点，并对试件的高周疲劳性能产生破坏性影响。提出了应力集中系数与缺陷结构参数之间关系的经验公式。所获得的定量信息将有助于了解工程构件的裂纹萌生和疲劳寿命预测。
The interacting effects of internal defects and corrosion pits on the stress concentration factors in hourglass-shaped specimens were investigated through a finite element method investigation. Very high cycle fatigue tests were performed to confirm the shape of the internal defects and the depth of the corrosion pit. According to the experimental observations, a series of three-dimensional models containing internal voids and corrosion pits were established. Stress distribution around the internal void and the corrosion pit under uniaxial tensile loading were obtained. Based on the finite element analysis, the stress concentration factors around the defects were found fully dependent on the structure parameters of the internal void and the corrosion pit. Stress concentration factors increased with the depth-to-length ratiosRdfor models with a single corrosion pit. For models with a single internal void, the stress concentration factors increased dramatically when the internal void is present near the surface. Parameters of distance-to-radius ratio (D2−h)/aand depth-to-length ratioRdplay important roles in the stress distribution for a model with both an internal void and a corrosion pit. Severe stress concentration would be introduced when the parameter (D2−h)/a< 2. For a deep corrosion pit (i.e.,Rd≥ 1), the stress concentration factors were determined by two parts which were dominated by parameters of (D2−h)/aandRd, separately. For a shallow corrosion pit (i.e.,Rd< 1), the stress concentration factors were dominated by the interaction of (D2−h)/aandRd. Two very close corrosion pit and void were most likely to be an initiation position and gave rise to devastating effects on the very high cycle fatigue performance of the specimens. Empirical equations were proposed to evaluate the relationship between the stress concentration factors and the structural parameters of defects. The obtained quantitative information would be useful for understanding of crack initiation and fatigue life prediction of engineering components.
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DOI：
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发表时间：
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