抄録
FEM analysis utilizing Barlat–Lian'89 anisotropy model and square shell deep drawing test at room temperature were carried out in order to improve the formability of Ti–3Al–2.5V sheet. As for the flange wrinkle, FEM analysis coincide with the experimental result more in case of 1.5% R-value than that of 5% R-value. The bigger the ΔCL , the greater the flange wrinkle. On the contrary the bigger the Rave, the smaller the flange wrinkle. Moreover, flange wrinkle decreases abruptly when Rave becomes equal or exceeds 2.0 in case that forming height becomes maximum value of 30 mm. And the flange breakage, occurs at the straight region of C-direction, proved to be caused by the shear stress.
