Numerical Simulation of Fatigue Crack Growth on the Pressure Vessel’s Surface
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摘要: 本文通过Franc 3D软件,计算了压力容器表面裂纹失稳扩展的临界尺寸及不同尺寸的初始裂纹的扩展,发现当容器表面的初始椭圆形裂纹尺寸小于3 mm×20 mm及5 mm×10 mm时,在裂纹穿透壁厚之前,裂纹尖端的应力强度因子都小于压力容器用钢的断裂韧性KIC,故该裂纹不会发生失稳扩展,且上述两个初始裂纹穿透容器壁厚时的循环载荷次数分别为40 688、45 560次。Abstract: The critical dimension of crack instability and propagation of initial elliptical crack of different sizes on the surface of pressure vessel was calculated by FRANC3D. It is found that stress intensity factor of the crack tip before penetrating the wall is less than the fracture toughness KIC of pressure vessel steel, when the size of initial crack on the pressure vessel surface is less than 3 mm × 20 mm and 5 mm × 10 mm, so the unstable propagation of the cracks does not occur. The cyclic loading numbers of the two initial racks, that are 3mm × 20 mm and 5 mm × 10 mm to penetrate the container wall, are 40688, 45560 and respectively.
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Keywords:
- numerical simulation /
- fatigue crack growth /
- FRANC3D
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