海底管道工程临界评估(ECA)参数敏感性分析
The sensitivity analysis of parameters involved in engineering critical assessment for the submarine pipeline
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摘要: 文中以某海管安装期间的缺陷验收为背景,依据BS7910标准《金属结构缺陷可接受性评价方法指南》,利用Crackwise4.0软件对埋藏裂纹进行了2A级断裂评估,并应用敏感度函数和敏感度因子的方法,分析了断裂韧性、主应力和材料力学性能对极限裂纹尺寸的影响,得到了它们各自的敏感度值.结果表明,在以文中选用的基准参数集为前提下,对于固定裂纹长度,室温下的屈服强度对极限裂纹高度影响最大;随着极限裂纹长度的增加,主应力对极限裂纹高度的敏感性有所增加,而断裂韧性和室温下屈服强度对极限裂纹高度的敏感性相对减小;而室温下抗拉强度对极限裂纹高度不敏感.Abstract: Based on the British standard BS7910, the fracture assessment of level 2A was performed using the Crackwise4.0 software for the embedded flaw, which were formed when the submarine pipeline was installed, in the context of defects acceptance. The influence of fracture toughness, primary stress and mechanical properties on the critical crack size was analyzed using sensitive functions and factors, and the values of sensitivity were obtained respectively. Depended on the benchmark set in this paper, for a certain crack length the crack height was most affected by the yield strength at room temperature. As the critical crack length increased, the effect of primary stress on the critical crack height increased and the influence of fracture toughness as well as theyield strength at room temperature decreased relatively. However, the critical crack height was not sensitive to the tensile strength at all.
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