基于磁记忆方法的断裂叶片应力分析

Metal magnetic memory (MMM) technology, based on the magneto-elasticity and magneto-mechanical effect theory, has been used to evaluate the stress of the rupture turbine blade. The fracture face of failure blade is detected with MMM method at workshop. The stress variation of fracture blade during the whole rupture process is analyzed and evaluated. It has been found the MMM signal variation amplitude of the crack transition zone in the fracture surface is minimal, that of the crack initiation zone is in the middle, and that of the tear fracture zone is maximal. The results of WESTHOMES software calculating and small hole stress measuring method have proved the validity of the MMM result.