Compute volumetric strain ε_v = ε_x + ε_y + ε_z from three principal strains for elastic-plastic deformation and soil volume change analysis.
输入三个正交方向应变,求体积应变。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Volumetric strain | epsilon_v = epsilon_1 + epsilon_2 + epsilon_3, the sum of the three principal strains | Timoshenko SP, Gere JM, Mechanics of Materials |
| Small-strain condition | This is a first-order approximation valid for small strains | ISO 80000-4:2019, Quantities and units - Part 4: Mechanics |
| Incompressible material | For nu = 0.5 the volumetric strain vanishes | Timoshenko SP, Gere JM, Mechanics of Materials |
| Relation to hydrostatic stress | epsilon_v = ( 1 - 2·nu ) · sigma_m / E, where sigma_m is the mean stress | Roark RJ, Young WC, Formulas for Stress and Strain |
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