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本文在中低碳合金结构钢,室温大气条件下取得的疲劳裂纹扩展宏观特性和微观断裂机制观测的有限数据基础上,对疲劳断裂机制图的制作和意义作了初步的探讨。机制图I以σ_s/K_(IC)和K_(max),机制图Ⅱ以K_(max)/K_(IC)和γ_B~C/d(即ΔK~2/12πσ_8~2d)分别为双对数直角座标轴。在这两种平面空间里,通过对实验数据的归纳,绘出了若干个不同断裂机制的区域及da/dN的数值范围。对应于一种材料状态,疲劳裂纹扩展过程在机制图中表现为穿过特定若干区域的一直线。疲劳断裂机制图对抗疲劳材料的选择、研制和改善及失效分析,将有一定的指导意义。
Based on the macroscopic characteristics of fatigue crack growth and the finite data of microscopic fracture mechanism obtained from medium and low carbon alloy structural steel and room temperature atmosphere, the fabrication and significance of fatigue fracture mechanism diagram are discussed. In the mechanism diagram I, σ_s / K_ (IC) and K_max are used, and in the mechanism diagram II, the logarithm values of K_max / K_IC and γ_B_C / d, Cartesian axis. In these two kinds of plane space, the area of several different fracture mechanisms and the range of da / dN are plotted by summarizing the experimental data. Corresponding to a material condition, the fatigue crack propagation process appears as a straight line across a specific number of zones in the mechanism diagram. Fatigue fracture mechanism against fatigue material selection, development and improvement and failure analysis, will have some guiding significance.