RESIDUAL STRESS MODELING OF A CURVE-SHAPED COMPOSITE PART MANUFACTURED WITH VACUUM ASSISTED RESIN TRANSFER MOLDING AND MULTI-STAGECURING TECHNIQUE

摘要

The dimensional infidelity, commonly referred to as the spring-in phenomenon, of a curveshapedpolymer matrix composite part is caused by the residual stress development during thecuring process of Vacuum Assisted Resin Transfer Molding (VARTM). The multi-stage curing(MSC) technique has been experimentally and theoretically validated as an effective method toreduce the spring-in angle recently [1]. Despite the results in [1] showing that the application ofMSC technique can significantly reduce the spring-in angle of a curve-shaped composite part,the further consequence regarding the final residual stress in the composite part manufacturedwith VARTM and MSC still remains unknown. In this study, a method to model the finalresidual stress distribution of a curve-shaped VARTM/MSC composite part is developed toachieve further in-depth understanding of the MSC technique for spring-in phenomenon andresidual stress mitigation.