Abstract
The influence of sheet thickness on the fracture resistance of a stably growing crack evaluated by crack energy density based on the method proposed in the 1st Report is investigated. That is, the experiments of stable growth fracture similar to those in 2nd Report are carried out varying the sheet thickness, and the fracture resistances expressed by additional rate of crack energy density and crack energy density are evaluated. The results are as follows : (1) The fracture resistances are almost independent of initial crack lengths and specimen types for any sheet thickness. (2) With the decrease of sheet thickness, the fracture resistance expressed by crack energy density at the initiation of crack growth decreases and, on the other hand, the fracture resistance expressed by crack energy density and additional rate of crack energy density of stably growing cracks increase under the uniform slant fracture mode. These effects of sheet thickness can be explained by considering the admissible types of plastic deformation around a crack tip.
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