Abstract
Abstract The present study addresses the mechanical behavior of polypropylene self-reinforced composites (SRC’s) considering polymeric structural changes after cutting. Self-reinforced polypropylene composite is fabricated using the HOT compaction method by maintaining the processing temperature at 164∘C. Conventional and unconventional cutting methods were used to cut the samples of standard dimensions. FTIR images revealed the formation of C=C, C-F, Halogen bonds after AWJ cutting initiated a decrease in the surface roughness value to 4.5μm (R a ). SEM analysis is performed to analyse structural integrity and damage of SRC’s. Structural changes formation after AWJ cutting leads to improve the ultimate tensile strength of the laminate by 20% compared to conventional cut samples. A similar trend is noticed for flexural properties and Shore –D hardness values for the SRC composite laminate correlated to polymeric changes with Conventional cutting due to the formation of C-N bond is observed after Laser cutting.
Highlights
Fiber-reinforced polymer (FRP) composites play a major role in distinct fields of engineering considering their excellence in stiffness and durability
The present study addresses the mechanical behavior of polypropylene self-reinforced composites (SRC’s) considering polymeric structural changes after cutting
A similar trend is noticed for flexural properties and Shore –D hardness values for the SRC composite laminate correlated to polymeric changes with Conventional cutting due to the formation of C-N bond is observed after Laser cutting
Summary
Fiber-reinforced polymer (FRP) composites play a major role in distinct fields of engineering considering their excellence in stiffness and durability. SRC composites have been designed and applied where toughness, ductility and adhesion between fibre and matrix are required [1]. Polypropylene self-reinforced composites (SRC) of highly oriented crystalline fibre and matrix have been developed, it gained much attention because of its lightweight and effective mechanical characteristics [2]. Polypropylene SRC composites reinforced fibre and matrix belong to the same family of thermoplastic polymer, which can be recycled. Crystalline fibres have a significant effect on mechanical properties which are extremely affected by the fabrication and cutting process. Conventional machining processes like turning, drilling, milling and shaping have been used on polymer composites. Owing to inherent heterogeneity and anisotropy, conventional machining results in anisotropic damage of composites due to matrix cracking, fibre pull-out, delamination, etc. It is suspected that some of the matrix materials and/or the reinforcements undergo structural changes due to thermal effects either due to direct heating or due to friction
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