| 摘 要： | - Using the frozen stress experiment of three dimensional photoelasticity, the stress fields around the front of initial surface crack at the hot spots of tubular T-joints are duly investigated. The distribution of stress intensity factors (SIF) along the front of the surface crack, and the effect of the depth and shape of a crack on the distribution and the magnitude of SIF are discussed. The test results show that (1) the Paris' relationship between the crack propagation rate and SIF in estimating both the crack propagation rates and their distribution along the front of the crack is still valid, (2) the magnitude and the distribution of SIF along the front of the half elliptic surface crack depend not only upon the depth of the crack a/T but also largely upon the shape parameter a/c of the crack.
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