Abstract: Under loading force,certain strain image pattern appears in one of the typical models. The features of the strain image pattern will change during deformation. Study of the features andtheir changes is helpful to distinguish unstable precursors and predict trend of deformation. Astrain field can be divided into several areas.They have different behaviors and interact each other during deformation and instability.Aclosely integrated dynamic system is formed of them.Therefore,the temporal and spatial evolution processes should be monitored overall in order to obtain precursors and seek mechanism of instability.

Key words: Simulation test, Strain observation, Dynamic field model

摘要： 在外力作用下,一定的构造形式周围会产生特定的应变图象。其形态特征在失稳过程中会发生变化。研究应变图象的特征及其变化有助于鉴别失稳前兆,预测变形发展趋势。受构造形式控制,应变场在空间分布上可以划分为若干区域。在变形与失稳过程中,各个区域既有不同的变形行为,也相互影响、相互制约,构成一个紧密联系的动态体系。因此,应当全面观测应变场图象的时间与空间动态演化过程,从中获取失稳前兆,分析失稳机制。

关键词: 模拟实验, 应变观测, 动态场模式