该算法根据每步计算中局部截断误差和精度的要求，合理调整步长大小。
This algorithm adjusts the step-size appropriately according to the presupposed precision and the local truncation error of each step.
结果表明，增加最小二乘拟合项次和合理选择数字图像相关计算子区域和步长大小可以提高应力强度因子计算精度。
The results show that increasing the number of least squares fitting terms and reasonable selection of digital image correlation subset size improve the accuracy of calculated stress intensity factor.
由数字图像相关方法所得位移场提取不同载荷作用下裂纹尖端应力强度因子，并分析最小二乘拟合项数、数字图像相关计算子区域和步长大小对计算结果的影响。
The stress intensity factor was extracted from the displacement field, and the effects of the number of terms, subset size and subset spacing on the calculation results were analysed.
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