摘要
计算了20Cr结构钢疲劳长裂纹和疲劳小裂纹扩展的应力强度因子范围ΔK、有效应力强度因子范围ΔKeff,并建立了da/dN-ΔK和da/dN-ΔKeff的关系。结果表明裂纹闭合是导致长裂纹在不同应力比R时的裂纹扩展规律差异的主要原因,但它可能不是引起小裂纹、长裂纹的扩展差异的主要因素。
This paper calculated the stress intensity range △K and the effective stress intensity range △K,ff of the long fatigue crack and short fatigue crack in the structure steel 20Cr, and build ed the curve of da/dN- △K and da/dN-△Keff. The result shows that the crack closure is the main reason of the difference of the da/dN -△K curve in different stress ratios of the long crack, but it is probable not the main reason of the difference of the da/dN-△K curve of the short crack and the long crack.
出处
《贵州工业大学学报（自然科学版）》
CAS
2006年第6期18-21,共4页
Journal of Guizhou University of Technology(Natural Science Edition)
