Modelling Stretch Blow Moulding of Poly (l-lactic acid) for the Manufacture of Bioresorbable Vascular Scaffold

Stretch blow moulding (SBM) has been employed to manufacture bioresorbable vascular scaffold (BVS) from poly (l-lactic acid) (PLLA), whilst an experience-based method is used develop the suitable processing conditions by trial-and-error. FEA modelling can be predict forming process scientific understanding on mechanical behaviour of PLLA materials above glass transition temperature (Tg). The applicability a constitutive model, ‘glass-rubber’ (GR) model with material parameters biaxial stretch was examined sheets replicating strain history tubes during moulding. different stress–strain relationship and under equivalent deformation suggested need re-calibration GR for tubes. A developed operation conditions, incorporating virtual cap rod capture suppression axial stretch. reliability tube blowing validated comparing shape evolution, results free test.