Objective to study the relation between the field size and depth of Fw (wedge factor) and its effect on the clinical usage.
目的研究楔形因子与照射野大小和测量深度的相关性，为临床准确使用该因子提供依据。
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.
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。
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