Table 3 Values of calibrated parameters of GTN failure criterion for al 6061 aluminum tube.
From: Parametric study of piercing force and surface quality in elastomer-assisted tube piercing
Parameter | \(\:{q}_{1}\) | \(\:{q}_{2}\) | \(\:{q}_{3}\) | \(\:{f}_{0}\) | \(\:{f}_{c}\) | \(\:{f}_{f}\) | \(\:{f}_{N}\) | \(\:{\epsilon\:}_{N}\) | \(\:{S}_{N}\) |
|---|---|---|---|---|---|---|---|---|---|
Value | 1.5 | 1 | 2.25 | 0.000125 | 0.01 | 0.027 | 0.0076 | 0.3 | 0.1 |
