反应堆压力容器接管边缘应力区局部减薄处应力强度特征

Research on Stress Intensity in Edge Stress Field of RPV Nozzle

用ANSYS有限元分析软件对反应堆压力容器接管边缘应力区应力强度进行了模拟分析。给出了接管边缘应力区筒体的薄膜应力强度、薄膜+弯曲应力强度以及减薄区应力集中系数随减薄区尺寸大小及其位置等因素的变化规律。分析得出:最大薄膜应力强度随着减薄区长半轴的增大呈外凸形增大,随着减薄区深度的增大呈直线形增大,随着减薄区离不连续区距离的增大呈内凹形减小;最大薄膜+弯曲应力强度随着减薄区长半轴的增大基本保持不变,随着减薄区深度的增大呈直线形增大,随着减薄区离不连续区距离的增大呈内凹形减小;应力集中系数随着减薄区长半轴的增大呈内凹形减小,随着减薄区深度的增大呈直线形增大,随着减薄区离不连续区距离的增大呈内凹形减小。

The stress intensity, of Reactor Pressure Vessel local wall-thinning area is calculated in the edge stress field of nozzle by ANSYS-a FE software. And the stress concentration factor, the membrane stress intensity and the membrane stress plus the bending stress intensity vs the dimension and location of part-through slot have been discussed. In this article we generalized that the membrane stress intensity is intensifying by long half axis in an external convexity curve, intensifying by depth in a straight line, weakeningby distance in an inner concave curve, and the membrane stress plus the bending stress intensity is no changing by long half axis nearly, intensifying by depth in a straight line, weakening by distance in an inner concave curve, and the stress concentration factor is minishing by long half axis in an inner concave curve, augmenting by depth in a straight line minishing by distance in an inner concave curve.