### 拉伸/压缩

• 测定原材料的拉伸/压缩特性，并与规范中记录的材料规格对比；
• 用于有限元件建模或其他产品设计的实验材料特性数据，从而确定所需的力学特征和服务占空比；
• 通过再现预期服务环境预估组件的机械性能。

Biological samples often require testing in their found condition although it is not uncommon to machine smaller samples from  specific areas (e.g. bone) of interest.  Small-scale testing often doesn’t conform to established standards and the test engineer is left to devise  the specimen geometry, gripping method and proper test equipment sizing  (i.e. low force)  to get optimized, repeatable results.