摘要
管道环焊缝的断裂韧性测试是管道完整性评估的基础,而J积分塑性因子的准确计算是断裂韧性测试的前提。本文针对试件厚宽比B/W=2的单边缺口拉伸(single edge notch tension, SENT)试件,建立管道母材不含侧槽与侧槽深度为10%的试件三维有限元模型,研究裂纹长度、试件厚度、硬化指数、试件侧槽对J积分塑性因子的影响,通过数值分析结果,考虑裂纹长度、材料硬化性能等因素的影响,通过拟合方法提出适用于不含侧槽与侧槽深度为10%的管道母材SENT试件J积分塑性因子方程,此方程可用于SENT试件断裂韧性测试。
The fracture toughness test of pipeline girth weld is the basis of pipeline integrity assessment, and the accurate calculation of J-integral plastic factor is the premise of fracture toughness test. In this paper, aiming at the SENT(single edge notch tension) specimen with thickness-to-width ratio B/W=2, a three-dimensional finite element model of the SENT specimen of the pipe base metal with/without side grooves depth of 10%is established. The influence of crack length, specimen thickness, hardening index and specimen side groove on J-integral plasticity factor are studied. Through fitting the numerical analysis results after considering the factors such as crack length and material hardening performance, the J-integral plastic factor equations of SENT specimens are developed, which is suitable for pipe base metal with or without side groove of depth of 10%.The equations could be used to test the fracture toughness of SENT specimens.
作者
武旭
帅健
谢彬
韩旭亮
马晨波
邓小康
WU Xu;SHUAI Jian;XIE Bin;HAN Xuliang;MA Chenbo;DENG Xiaokang(CNOOC Research Institute,Beijing 100028,China;College of Safety and Ocean Engineering,China University of Petroleum,Beijing 102249,China)
出处
《力学与实践》
北大核心
2022年第2期344-350,共7页
Mechanics in Engineering
基金
国家自然科学基金(51874324)
中海油研究总院科技项目(2020-GCZLKT-001)资助。
