As the length of mandrel extension increases, the trend of thinning-rate change can be failed into three stages, namely linear decrease stage, transitional stage and nonlinear increase stage.
随着芯棒伸出量的增加，管材弯曲过程中的壁厚变薄率变化趋势可分为三个阶段即线性下降阶段、过渡阶段和非线性增加阶段。
The commonly used methods for calculating the shoreline change rate based on the coastal evolution history include end point method, average the method, linear regression method and jackknife method.
计算历史时期海岸线变化率常用的数学方法有端点法、平均速率法、线性回归法和折剪法。
The results show that the axis linear ablation rate of the material has a great change and the linear ablation increases along the gas flux direction.
结果表明：导流管轴向线烧蚀率变化较大，沿气流方向呈上升趋势。
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