周凌志,王昱,郄彦辉,李乃文
ZHOU Ling-zhi,WANG Yu,QIE Yan-hui,LI Nai-wen

• 1:河北工业大学机械工程学院
• 2:河北省特种设备监督检验研究院

摘要(Abstract)：

为研究壁厚减薄缺陷对弯头爆破压力的影响，在试验验证可靠性的基础上，建立了弯头内拱处含局部壁厚减薄缺陷爆破压力预测的显式非线性有限元模型，采用等效塑性应变失效作为弯头的失效准则，研究了缺陷尺寸对弯头爆破压力的影响。研究结果表明：缺陷深度小于壁厚70%时，缺陷宽度对爆破压力的影响较小，但缺陷深度大于70%时，其影响较大不能忽略；缺陷长度的增加会导致爆破压力的减小，但二者不是线性关系；当缺陷长度小于15°时，爆破压力随缺陷长度增加降低较快，而缺陷长度大于15°时，爆破压力随缺陷长度增加降低趋缓；缺陷相对深度是影响爆破压力的主要因素，爆破压力会随着缺陷相对深度的增加而快速降低。
In order to study the influence of the size of wall thinning defect on the burst pressure of elbows, an explicit nonlinear finite element model for predicting the burst pressure of elbows with local wall thinning defects at inner arch was established on the basis of test verification. The influence of defect size on the burst pressure of elbows was studied by using the plastic strain failure as the failure criterion of elbows. The results show that when the defect depth is less than 70% of the wall thickness, the effect of defect width on burst pressure is small, but when the defect depth is more than 70%, the effect is large enough and cannotbe ignored. The burst pressure decreases with the increase of the defect length, but not in a linear relationship. When the defect length is less than 15°, the burst pressure decreases rapidly with the increase of the defect length, but when the defect length is more than 15°, the burst pressure decreases slowly with the increase of the defect length. The relative depth of defect is the main factor affecting the burst pressure, and the burst pressure will decrease rapidly with the increase of the relative depth of defect.

关键词(KeyWords)： 壁厚减薄;弯头;爆破压力;显示非线性
wall-thinning;elbow;burst pressure;explicit nonlinear

Abstract:

Keywords:

基金项目(Foundation): 河北省高等学校自然科学计划重点资助项目(ZD2017022,ZD2018016);; 河北省质量技术监督局科技计划资助项目(2018ZD13,2020ZC26);; 河北省特种设备监督检验研究院科技计划资助项目(HBTJ2021CY003)

作者(Author): 周凌志,王昱,郄彦辉,李乃文
ZHOU Ling-zhi,WANG Yu,QIE Yan-hui,LI Nai-wen

DOI: 10.19931/j.EB.20210004

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