The purpose of this paper is to make an assessment on the performance of a fiber reinforced plastic(FRP)helmet-head system subjected to ballistic impact.Firstly,a finite element(FE)model for the human head is develope...The purpose of this paper is to make an assessment on the performance of a fiber reinforced plastic(FRP)helmet-head system subjected to ballistic impact.Firstly,a finite element(FE)model for the human head is developed.Constitutive models for each component of the head are determined and,in particular,strain rate effects of the compact bone of the skull and the hyperelastic property of the scalp are taken into account for the first time.Secondly,an FE model for Kevlar fiber reinforced plastic(KFRP)helmet is constructed based on the personal armor system for ground troops(PASGT)helmet.Recently developed dynamic constitutive models for metals and FRP laminates are employed for full metal jacketed(FMJ)bullet and the KFRP helmet.Finally,both the head and the helmet models are validated against available test data.Furthermore,the effects of various factors such as padding system,impact position,and projectile type on the ballistic performance of the helmet-head system have been systematically investigated with special attention being paid to the severity of head injury.It is found that the performance of the helmet with OA foam is advantageous over that of the helmet with strap-netting in head injury prevention.It is also found that a lower velocity(358 m/s)FMJ bullet poses more threats to head injury than a higher velocity(610 m/s)fragment-simulating projectile for the PASGT helmet-head system.展开更多
文摘The purpose of this paper is to make an assessment on the performance of a fiber reinforced plastic(FRP)helmet-head system subjected to ballistic impact.Firstly,a finite element(FE)model for the human head is developed.Constitutive models for each component of the head are determined and,in particular,strain rate effects of the compact bone of the skull and the hyperelastic property of the scalp are taken into account for the first time.Secondly,an FE model for Kevlar fiber reinforced plastic(KFRP)helmet is constructed based on the personal armor system for ground troops(PASGT)helmet.Recently developed dynamic constitutive models for metals and FRP laminates are employed for full metal jacketed(FMJ)bullet and the KFRP helmet.Finally,both the head and the helmet models are validated against available test data.Furthermore,the effects of various factors such as padding system,impact position,and projectile type on the ballistic performance of the helmet-head system have been systematically investigated with special attention being paid to the severity of head injury.It is found that the performance of the helmet with OA foam is advantageous over that of the helmet with strap-netting in head injury prevention.It is also found that a lower velocity(358 m/s)FMJ bullet poses more threats to head injury than a higher velocity(610 m/s)fragment-simulating projectile for the PASGT helmet-head system.
