Repeated impact on fatigue fracture of carbon spring En-42J steel |
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| Institution: | 1. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. Guangdong Meizhi Compressor Co. Ltd, Guangdong 528333, China;1. Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1;2. F&P Manufacturing Inc., 1 Nolan Road, Tottenham, ON, Canada L0G 1W0 |
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| Abstract: | The influence of repeated impact loading on fatigue fracture of carbon spring En-42J steel is studied. A highly localized plastic deformation is observed at the time of impact. The circular disc specimen is failed by impact fatigue resulting in small chips and ordinary fatigue failure by slow crack growth. The crack growth behavior depends on specimen geometry, load spectra and material type. The resultant of applied and residual stress was highest at the edge of the circular disc where the crack initiated. The fractured surface showed typical cleavage facets and dimples indicating acicular martensite. A model is developed to explain fatigue crack initiation and propagation behavior under impact loading. Stress calculations are made to determine catastrophic failure. Crack initiation occupied the major part of impact fatigue life while crack growth was fast and led quickly to sudden fracture. |
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