That discontinuousfunction is not only convenient for integral and derivative, but also can be better reflect the displacement character after crack than heaviside function.
指数型间断函数具有在数学上的便于积分和求导的优点，且比阶梯间断函数更能反映实际破裂后的变形情况。
2
As it gradually increases, the discontinuous border of the system function appears, and the jump of the system energy at it also becomes bigger.
随着保护区逐渐增大，系统函数的不连续边界出现，而且系统在此边界处的能量跳跃也逐渐增大。
3
Element free Galerkin method (EFG) is hard to handle nature boundary condition and the discontinuous medium boundary condition because of its special approximate function.