Performance of long fiber reinforced thermoplastics subjected to transverse intermediate velocity blunt object impact

Abstract An understanding of long fiber reinforced thermoplastic (LFT) behavior while undergoing high energy, high strain rate impact is essential in promoting its use in automotive and other markets. In this work, damage tolerance of polypropylene (PP)/E-glass LFTs subjected to transverse blunt object impact (BOI) was investigated, treated from an experimental standpoint, in order to characterize energy dissipation and damage modes. LFT subjected to BOI exhibited high impact energy dissipation, which increased linearly with increasing areal density. The average impact energy dissipation at the critical velocity (ballistic limit) was 167 J and 121 J for a 4.61 g cm −2 specimen impacted by flat and conically shaped projectiles, respectively. The fiber orientation also played a large role in energy dissipation; failure appeared to occur along planes of preferential fiber orientation. The critical energy for specimen perforation did not vary with the mass of the impactor, i.e. strain rate, in the range investigated. This overall work advances the state-of-the-art in LFTs with an automotive focus.

[1]  J. Thomason,et al.  Influence of fibre length and concentration on the properties of glass fibre-reinforced polypropylene: 1. Tensile and flexural modulus , 1996 .

[2]  Anoush Poursartip,et al.  Energy-based approach to impact damage in CFRP laminates , 1997 .

[3]  F. Findik,et al.  Ballistic impact performance of composite structures , 2002 .

[4]  Yong-Taek Im,et al.  Experimental and numerical study of the impact behavior of SMC plates , 1999 .

[5]  J. Methven,et al.  Rheological characterisation of discrete long glass fibre (LGF) reinforced thermoplastics , 2000 .

[6]  Krishan K. Chawla,et al.  Composite Materials: Science and Engineering , 1987 .

[7]  Practical use of the statistically modified laminate model for injection moldings. Part 1: Method and verification , 1998 .

[8]  K. Ramani,et al.  Process-induced residual stresses in compression molded UHMWPE , 1999 .

[9]  S. T. Jenq,et al.  A Model for Predicting the Residual Strength of GFRP Laminates Subject to Ballistic Impact , 1992 .

[10]  P. T. Curtis,et al.  The stiffness and strength of a polyamide thermoplastic reinforced with glass and carbon fibres , 1978 .

[11]  Serge Abrate,et al.  Impact on Composite Structures , 1998 .

[12]  D. Hall.  Examination of the effects of underwater blasts on sandwich composite structures , 1989 .

[13]  John Morton,et al.  The influence of varying projectile mass on the impact response of CFRP , 1989 .

[14]  J. Koenig,et al.  The characterization of low cost fiber reinforced thermoplastic composites produced by the DRIFT™ process , 2001 .

[15]  H. Hsiao,et al.  Strain rate behavior of composite materials , 1998 .

[16]  M. J. Iremonger,et al.  Ballistic impact of fibre composite armours by fragment-simulating projectiles , 1996 .

[17]  Anthony Chukwujekwu Okafor,et al.  Detection and characterization of high-velocity impact damage in advanced composite plates using multi-sensing techniques , 2001 .

[18]  J. Thomason,et al.  The influence of fibre length and concentration on the properties of glass fibre reinforced polypropylene: 2. Thermal properties , 1996 .