Abstract
Forming limit diagram (FLD) is an important tool in designing sheet metal forming processes. FLD is used to determine if a sheet metal forming process may induce necking in the material. However, these are only reliable for operations with linear strain paths. Stoughton [1] developed the stress based forming limit diagrams (FLSD) which are independent of strain path present in the material. This paper focuses on converting experimental FLD of Ti-6Al-4V at 400°Cpublished by Kotkunde et al. [2] to FLSDs. Various anisotropic yield criterion (Hill 48, Hosford 79, Barlat 89) and hardening rules (Hollomon Power Law, Swift Law and Modified Voce Law) are used.In addition, experimental FLDs and theoretical FLD curves obtained from Marciniak-Kuczynski (MK) analysis are converted to FLSDs and compared.
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