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根据实验获得了用常规工艺生产的铝、钛合金的平缓的K_R和J_R阻力曲线,其K_(lc)与J_(lc)是相一致的。基于这个事实,提出了裂纹准稳态扩展的概念,并通过数据分析对它的规律作了探讨。基于这种规律,讨论了K_(lc)与J_(lc)相一致的依据,进而指出能用不同样品几何的同等有效的K_(lc)、K_s~*、K_(max)和J_(lc)来评价材料的断裂韧度。因此,在一定的样品几何下,K_(max)可以用作评价铝、钛合金的平面应变断裂韧度的判据。
According to the experiment, the K_R and J_R resistance curves of aluminum and titanium alloy produced by the conventional process are obtained. The K_ (lc) and J_ (lc) are consistent. Based on this fact, the concept of crack quasi-steady-state expansion is proposed and its regularity is discussed through data analysis. Based on this law, the basis for consistent K_ (lc) and J_ (lc) is discussed, and then it is pointed out that K_ (lc), K_s ~ *, K_max and J_ (lc) To evaluate the fracture toughness of the material. Therefore, under certain sample geometries, K max can be used as a criterion to evaluate the plane strain fracture toughness of aluminum and titanium alloys.