单边缺口拉伸试件J积分塑性因子有限元分析研究1)

FINITE ELEMENT ANALYSIS OF J-INTEGRAL PLASTIC FACTOR OF SINGLE EDGE NOTCH TENSION SPECIMEN1)

  • 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。

     

    Abstract: 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.

     

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