Studies and Applications of Three Kinds of Calculation Methods by Describing Damage Evolving Behaviors for Elastic-Plastic Materials

摘要: Abstract By means of bidirectional combined coordinate system, three kinds calculation methods are proposed with respect to the damage evolving rate and life elasticplastic material, which include singleparameter method, ratio method multiplication-method. In this work a lot new equations given; concept on all around material constant is provided, has functional relations each typical parameters: fatigue strength coefficient o f , exponent b ' 1 ductility ɛ' c average stress, strain, critical loading time so on. addition, an example carpart given, some comparisons results made. The will have practical significance in avoiding unnecessary tests, saving time, manpower capital, as well providing convenience for engineering applications certain degree.