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一、绪言众所周知,磁性探伤法是探伤钢铁材料焊缝金属近表面缺陷的一种有效方法。在磁性探伤中,为了定量地把握缺陷情况,有必要对缺陷的大小与从缺陷处产生的泄漏磁通密度之间的关系进行讨论。最近,电机电器行业中已普遍使用了数值计算方法。在给出边界条件的情况下,就可用麦克斯韦尔电磁方程组来进行数值计算。计算方法中常用的一种是差分法,在规定差分法的边界条件时,为了保证足够的精度,要用很细的网格进行分割。这样使计算
First, the introduction As we all know, magnetic flaw detection method is to detect the weld metal surface defects near the surface of an effective method. In magnetic flaw detection, in order to quantitatively grasp the flaw, it is necessary to discuss the relationship between the flaw size and the leaked flux density generated from the flaw. Recently, numerical methods have generally been used in the electrical appliance industry. Given the boundary conditions, Maxwell’s electromagnetic equations can be used for numerical calculations. One commonly used method of calculation is the difference method. In specifying the boundary conditions of the difference method, in order to ensure sufficient accuracy, it is necessary to divide it with a very fine grid. This makes calculation