Biaxial test method for determination of FLCs and FFLCs for sheet metals: validation against standard Nakajima method

• Biaxial test method for FLC was validated against the standard Nakajima Thickness strain variation within effective gauge area similar both methods Radius of dome profile in cruciform specimen notably affected fracture location demonstrated capability constructing and FFLC Recently, a biaxial comprising design spatio-temporal to determine limit strains has been proposed determination forming curves (FLCs) (FFLCs) sheet metals. However, this not yet existing methods. In present work, applied aluminium alloy AA5754 formability evaluation at room temperature results from have compared with those method. Theoretical analysis carried out compare equi-biaxial tension cases two methods; thickness radial distance normalised by radius is found between tests, decreasing through-thickness profile, which thinned, leads nearer centre but produces less uniform distribution. Importantly, major necking on FLC, as determined using methods, are almost same plane-strain state, while other states, slightly lower than that An also method, decreases increasing ratio ? ?0.5 0, it changes only when > 0.