Abstract: It is found that the coefficients oi the COD design curve for BSI PD6493-1980 and JWES2805-1983 are within the 0.51.5) have to becomparatively greater than those in the low strain zone. Needless to say, such a great variation values at different sections of one and the same curve must be looked upon as being most irrational. Hence a CVDA ( Chinese Pressure Vessel Defect Assessment) design curve, to be employed in the Chinese CVDA code, is given in this paper:

摘要： 通过一系列宽板试验、带裂纹容器试验及工程容器典型事例分析,特别是高应变异形板试验、加筋宽板的有限元计算及大型容器接管裂纹测试研究与理论分析,作者发现无论是PD6493—80或JWES2805—83的设计曲线,在e/e_y=1附近,安全裕度均较小;特别是PD6493—80设计曲线的高应变区(e/e_y>1.5)的安全裕度却比低应变区要大得多;在同一设计曲线范围内,各段差异极大,显然是不合理的.本文提出了CVDA设计曲线为中国规范所采用.它的最后表达式为:经过理论分析及大量数据验证,充分说明了CVDA设计曲线的适用性、合理性和先进性.