通过对 2 14Cr1Mo钢及其焊接接头在常温和高温下应力 -应变关系曲线的分析 ,用塑性多段幂次法描述材料的本构关系。基于弹塑性有限元法和工程评定方法建立 2 14Cr1Mo钢及其焊接接头的失效评定曲线 (FAC) ,并将计算结果与R6通用曲线进行了比较 ,为 2 14Cr1Mo钢制压力容器缺陷的安全评定提供技术支持 By analyzing the stress-strain curve of 2 14Cr1Mo steel and its welded joint under normal temperature and high temperature, the plastic multi-order power method is used to describe the constitutive relation of the material. The failure assessment curve (FAC) of 2 14Cr1Mo steel and its welded joint was established based on the elasto-plastic finite element method and engineering assessment method. The calculated results were compared with the R6 universal curve to provide safety assessment for 2 14Cr1Mo steel pressure vessel defects Technical Support