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前言高应变区裂纹容限分析是防止压力容器和其他工程焊接结构脆性断裂的一个实际问题。为了在这种裂纹容限分析中应用 COD断裂判据δ=δ_c,需要建立张开位移δ与裂纹几何尺寸及标称应变(?)之间的函数关系。由宽板实验归纳出的 Burdekin 关系,是进行这种分析经常被引用的资料。但是,不同裂纹几何的宽板在加载过程中可能产生完全不同的屈服方式,使得裂纹张开位移δ和标称应
Preface The analysis of crack tolerance in high strain zone is a practical issue to prevent brittle fracture of welded structures of pressure vessel and other engineering. In order to apply the COD fracture criterion δ = δ_c in this crack margin analysis, it is necessary to establish the functional relationship between the open displacement δ and the crack geometry and the nominal strain (?). The Burdekin’s relationship, summarized by a wide panel experiment, is often cited for this analysis. However, wide plates with different crack geometries may produce completely different yield modes during loading, such that the crack opening displacement δ and the nominal