Abstract
For an elasto-plastic crack, the crack energy density, of which the concept was proposed by author as the most important parameter to explain the behavior of crack, and the energy release rate are discussed. The results are as follows : (1) The relation between crack energy density and load-displacement curve is discussed and a method to evaluate crack energy density from load-displacement curve is established. Also, the physical meaning of so-called JIC-test is clarified. (2) A general expression of energy release rate for an elasto-plastic crack is obtained, which is available for completely elastic fracture, fracture accompanied with small scale yielding and also fracture accompanied with large scale yielding. (3) The behavior of an elasto-plastic crack is explained from the stand-point of energy, and an error in Orowan-Irwin theory based on energy balance is pointed out.
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