The single point incremental forming (SPIF) process is gaining special attention in the aerospace, biomedical and manufacturing industries for making intricate asymmetric components. In the present study, SPIF process has been performed for forming varied wall angle conical and pyramidal frustums using DP590 steel. Initially, the conventional stretch forming process has been performed for finding the fracture forming limit diagram (FFLD). Further, it has been validated with the limiting strains found using SPIF process. The conical and pyramidal frustums deformed near to the plane strain and biaxial region, respectively. The theoretical FFLD has been predicted using seven different ductile damage models. The effect of sheet anisotropy while predicting the fracture strains has been included using Hill 1948 and Barlat 1989 yielding functions. Among the used damage models, the Bao-Wierzbicki (BW) model along with Barlat 1989 yield criterion displayed the least error of 2.92% while predicting the fracture locus. The stress triaxiality in the different forming region has been thoroughly investigated and it has been found that the higher triaxiality value reveals high rate of accumulated damage which lead to early failure of the material in the respective region. The stress triaxiality and effective fracture strains have also been found to be significantly affected by the anisotropy. The micro-textural studies have also been performed and it has been found that the increase in local misorientations and shift in the textural components from γ-fiber to ε-fiber in the corner region of the frustums worked towards limiting the formability of material and ultimately leading towards the fracture of frustums.

单点渐进成形 (SPIF) 工艺在航空航天、生物医学和制造行业中因制造复杂的不对称部件而受到特别关注。在本研究中，已执行 SPIF 工艺以使用 DP590 钢形成不同壁角的圆锥和棱锥截头体。最初，为了找到断裂成形极限图（FFLD），已经执行了传统的拉伸成形工艺。此外，它已经通过使用 SPIF 过程发现的限制性菌株进行了验证。圆锥和棱锥截头体分别在平面应变和双轴区域附近变形。已使用七种不同的延性损伤模型预测了理论 FFLD。使用 Hill 1948 和 Barlat 1989 屈服函数，在预测断裂应变时片材各向异性的影响已包括在内。在使用的损伤模型中，Bao-Wierzbicki (BW) 模型和 Barlat 1989 屈服准则在预测断裂轨迹时显示的误差最小，为 2.92%。对不同成形区域的应力三轴度进行了彻底的研究，发现较高的三轴度值显示出较高的累积损伤率，从而导致相应区域中材料的早期失效。还发现应力三轴性和有效断裂应变受各向异性的显着影响。