where $D$ = outer diameter. For coiling, the minimum bend radius without plastic collapse is:
$$R_b,min \approx \fracE \cdot t\sigma_y$$
$$\sigma_h = \fracP \cdot Rt, \quad \sigma_a = \fracP \cdot R2t$$
where $D$ = outer diameter. For coiling, the minimum bend radius without plastic collapse is:
$$R_b,min \approx \fracE \cdot t\sigma_y$$
$$\sigma_h = \fracP \cdot Rt, \quad \sigma_a = \fracP \cdot R2t$$