In the experiments, a small-amplitude sine wave of displacement is modulated to shear loading to study the effects of shear stress perturbation on stick-slip instability.
实验中通过在剪切方向上叠加正弦波状的位移扰动，研究了剪应力扰动对断层粘滑失稳的影响。
Stress intensity factors at the craek tips are computed by complex variable functions and perturbation method and formulas are given in power series forms.
采用复变函数及摄动方法，最后以幂级数形式给出应力强度因子的计算公式。
In this paper a perturbation boundary element method is proposed to analyse stress and strain for the problems with nonlinear materials.
本文提出用摄动边界元法对材料非线性问题进行应力、应变分析。
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