Abstract: Residual strength model is phenomenological methodologies which can describe the fatigue crack behavior of machinery components visually. For some special elements, such as engine crankshafts, it is hard to build their residual strength model by normal experimental methods. In order to study their residual strength, an experimental residual strength model based on dynamical information tracing technology is brought forward. This model is built on modality analysis of the resonant crankshaft test machine and fracture mechanics analysis of crack expanding behavior. The basic principle and discussion of feasibility of the method are presented. Some relevant tests are conducted for a kind of diesel engine crankshaft, and basic characters of their residual strength degeneration are evaluated accordingly.

Key words: Crankshaft Fatigue test, Reliability, Residual strength