Method for predicting fatigue crack propagation rule

• Main Authors: BAI ENJUN, XIE LIYANG, BAI XIN, TONG ANSHI, REN JUNGANG
• Format: Patent
• Language: Chinese; English
• Published: 18.06.2014
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method for predicting a fatigue crack propagation rule and belongs to the technical field of prediction of material fatigue crack propagation speed rates. According to the method, a crack propagation rule is deduced according to tracking observation for a crack propagation situation within a period of time, so that the remaining life of fatigue crack propagation can be predicted; under the conditions that the stress size and the loading frequency are given or not, the method is divided into prediction methods for three situations; by taking (0, a0) under a stress amplitude of an initial crack as a starting point, a curve of relation between the crack length and the loading frequency under different stress amplitudes is drawn out; a corresponding a-N curve is found out according to different conditions and can describe the crack propagation rule. Software is compiled according to the method for predicting the fatigue crack propagation rule. The method is wide in application and high i