Experimental characterisation on the behaviour of PLLA for stretch blowing moulding of bioresorbable vascular scaffolds

Huidong Wei, Gary Menary, Fraser Buchanan, Shiyong Yan, James Nixon

Research output: Contribution to journalArticle

39 Downloads (Pure)

Abstract

Processing tubes from poly (l-lactic acid) (PLLA) by stretch blow moulding (SBM) is used in the manufacture of bioresorbable vascular scaffolds (BVS) to improve their mechanical performance. To better understand this processing technique, a novel experimental setup by free stretch blow inside a water bath was developed to visualise the tube forming process and analyse the deformation behaviour. PLLA tubes were heated, stretched and blown with no mould presented inside a temperature-controlled water bath whilst recording the processing parameters (axial force, inflation pressure). The onset of pressure activation was controlled deliberately to propose a simultaneous (SIM) and sequential (SEQ) operation after the axial stretch. Real-time images of the tube during forming were captured using high speed cameras and the surface strain of the patterned tube was extracted using digital image correlation (DIC). The deformation characteristics of PLLA tubes in SBM was demonstrated by the results of shape evolution, strain history and stress-strain relationship.
Original languageEnglish
JournalInternational Journal of Material Forming
Early online date17 Jan 2020
DOIs
Publication statusEarly online date - 17 Jan 2020

Fingerprint Dive into the research topics of 'Experimental characterisation on the behaviour of PLLA for stretch blowing moulding of bioresorbable vascular scaffolds'. Together they form a unique fingerprint.

  • Cite this