The conventional photoelastic modes and procedures suffice to indicate whether or not the yield point of the material of the prototype will be exceeded. 常用的光弹性模型和方法能够指明原型材料的屈服点是否将被超过。
A statically indeterminate structure will usually sustain loads in excess of that at first yield before instability occurs. 超静定结构通常在失稳之前，既使超过第一个屈服点还能承受载荷。
