pre-buckling

例句：

1. 1.The beam is pre-buckling under the load.
   梁在荷载下开始预屈曲。
2. 2.The structure is designed to withstand large loads before buckling.
   该结构设计为在屈曲前承受大载荷。
3. 3.During testing, the material was found to be pre-buckling at a certain strain level.
   测试中发现，材料在某一定应变水平下开始预屈曲。