在应用裂纹柔度法计算残余应力时，插值函数及其阶数的选择对计算结果的精确性有着较大的影响。
In the evaluation of the residual stress by the crack compliance method, different interpolation functions and their fit order had great effect on the calculation results.
本文给出了在预定精确度下用迭代法计算算术平方根的方法，并分析了迭代的误差，给出了预定精确度下初始值的一个选取范围。
This paper gives a method to calculate the arithmetic square root by iteration with given accuracy, analyses the iteration error and provides a selected range of initial value with the given accuracy.
由于这种局限性的存在，而造成UL列式法的收敛值有时与精确解有较大的偏差。
This limitation sometimes causes much deviation between convergence of ul formulation and the exact solution.
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