The breakage of workpieces, or so called failures,takes place under the following three conditions: rupture due to insufficient strength, over deformation caused by weak stiffness and being incapable of maintaining/keeping balance due to lack of stability.
翻译时注意了用词的变化,如"不足"用了" insufficient""weak"和"lack of",使其更加忠实于原句.
“破坏”应为“breakage"断裂“为“rupture","变形过大"为 “over-deformation”
“最主要的受力情况有拉压,扭转和弯曲三种.译文：There are three main load-bearing conditions, namely, tension, torsion and bending.
注：应为拉力吧,如果拉压应为tension and compression
人工翻译,尽量采用了专业词汇,如有帮助,敬请采纳,谢谢!