关键词: 断裂韧性, 估算方法, 疲劳裂纹扩展速率

Abstract:

A method is put forward to estimate fracture toughness K c by fatigue crack growth rate of material, and twelve sets of test data for two materials , titanium alloy IMI318 and aluminium alloy 7075 T7351, are used to analyse the error introduced by the method and the way to control it. The results indicate that the error can be controlled within the limits of the test scatter band. Thus, a new reliable and convenient approach is provided to acquire fracture toughness data of materials since a large number of fatigue crack growth rate data are available.

Key words: fracture toughness, estimating method, fatigue crack growth rate