Compute lateral strain ε_lat = −ν·ε_long from axial strain and Poisson's ratio, describing lateral contraction or expansion.
纵向受拉时横向收缩,比例系数为泊松比。
| Item | Standard / Source | Key Point |
|---|---|---|
| Poisson lateral strain | Poisson (1820s); elasticity | ε_lat = -ν*ε_long; metals typically 0.25-0.35 |