본 연구에서는 Taylor 충격 실험에 대한 점탄성 재료의 거동을 DYNA3D 코드를 이용하여 수치 연구 하였고, 점탄성 폴리머에 밀도차가 큰 금속을 씌운 슬리브드(sleeved) 관통자에 대하여 DYNA3D 코드와 상용 해석 프로그램인 AUTODYN을 이용하여 슬리브드 관통자에 대하여 비교해 보았다. 또한 장갑의 관통을 해석하기 위해 AUTODYN의 SPH 방법을 이용하여 타겟(장갑)의 내부에 점탄성 폴리머인 PLEXIGLASS와 ...
본 연구에서는 Taylor 충격 실험에 대한 점탄성 재료의 거동을 DYNA3D 코드를 이용하여 수치 연구 하였고, 점탄성 폴리머에 밀도차가 큰 금속을 씌운 슬리브드(sleeved) 관통자에 대하여 DYNA3D 코드와 상용 해석 프로그램인 AUTODYN을 이용하여 슬리브드 관통자에 대하여 비교해 보았다. 또한 장갑의 관통을 해석하기 위해 AUTODYN의 SPH 방법을 이용하여 타겟(장갑)의 내부에 점탄성 폴리머인 PLEXIGLASS와 폴리우레탄을 충진 한 cassette를 수치 연구 하였다.
본 연구에서는 Taylor 충격 실험에 대한 점탄성 재료의 거동을 DYNA3D 코드를 이용하여 수치 연구 하였고, 점탄성 폴리머에 밀도차가 큰 금속을 씌운 슬리브드(sleeved) 관통자에 대하여 DYNA3D 코드와 상용 해석 프로그램인 AUTODYN을 이용하여 슬리브드 관통자에 대하여 비교해 보았다. 또한 장갑의 관통을 해석하기 위해 AUTODYN의 SPH 방법을 이용하여 타겟(장갑)의 내부에 점탄성 폴리머인 PLEXIGLASS와 폴리우레탄을 충진 한 cassette를 수치 연구 하였다.
Today, many researches are accomplished from defense industry in order to improve protection ability of the armored vehicle. In this military area, it is important to consider not only protection ability but also maintaining ability. In order to solve this problem, we had studied the non-explosive m...
Today, many researches are accomplished from defense industry in order to improve protection ability of the armored vehicle. In this military area, it is important to consider not only protection ability but also maintaining ability. In order to solve this problem, we had studied the non-explosive material which is used viscoelastic materials inside two parrel plates of the armed vehicle as a role for absorbing the kinetic energy of the projectile.
In this regard, we needed to understand the dynamic impact behavior of viscoelastic materials. In this thesis, we analyzed the deformation of viscoelastic materials after impact using the explicit finite element method by employing DYNA3D code. When two shear modulus values, that is, short and long time shear modulus, are not the same, impact projectiles have a tendency as a viscoelastic solid and viscoelastic fluid depending on the decay constant which is inversely proportional to the relaxation time. On the other hand, when two shear modulus values are the same, the decay constant did not give any influence on the deformation behavior of viscoelastic impact projectiles.
And we also analyzed the sleeved projectile in which the core material of viscoelsatic polymeric materials is located with sleeved metallic materials. We performed numerical analysis for deformation of the sleeved projectile during impact test by using the commercial software of AUTODYN and DYNA3D code. In results of numerical analysis by using two softwares, there were found mushroom shape after impact for both cases. And when long-time shear modulus was chosen as 0.2 GPa and 0.25 GPa, the sleeved projectile was seen as concave shapes after impact which would be the typical representative bebavior for the viscoelastic materials.
We also studied about penetration problem for relatively high speed impact by using the AUTODYN software with SPH methods. Combination of different materials used both in the projectile and the target is getting more important in design for maximization of energy absorption during impact. We have defined and discussed the bulging velocity tendency depending on some important geometrical and material parameters such as the interlayer plate thickness, yield strength, and tensile limit for several different interlayer thickness and different elapsed time after impact by using commercial software of AUTODYN.
Today, many researches are accomplished from defense industry in order to improve protection ability of the armored vehicle. In this military area, it is important to consider not only protection ability but also maintaining ability. In order to solve this problem, we had studied the non-explosive material which is used viscoelastic materials inside two parrel plates of the armed vehicle as a role for absorbing the kinetic energy of the projectile.
In this regard, we needed to understand the dynamic impact behavior of viscoelastic materials. In this thesis, we analyzed the deformation of viscoelastic materials after impact using the explicit finite element method by employing DYNA3D code. When two shear modulus values, that is, short and long time shear modulus, are not the same, impact projectiles have a tendency as a viscoelastic solid and viscoelastic fluid depending on the decay constant which is inversely proportional to the relaxation time. On the other hand, when two shear modulus values are the same, the decay constant did not give any influence on the deformation behavior of viscoelastic impact projectiles.
And we also analyzed the sleeved projectile in which the core material of viscoelsatic polymeric materials is located with sleeved metallic materials. We performed numerical analysis for deformation of the sleeved projectile during impact test by using the commercial software of AUTODYN and DYNA3D code. In results of numerical analysis by using two softwares, there were found mushroom shape after impact for both cases. And when long-time shear modulus was chosen as 0.2 GPa and 0.25 GPa, the sleeved projectile was seen as concave shapes after impact which would be the typical representative bebavior for the viscoelastic materials.
We also studied about penetration problem for relatively high speed impact by using the AUTODYN software with SPH methods. Combination of different materials used both in the projectile and the target is getting more important in design for maximization of energy absorption during impact. We have defined and discussed the bulging velocity tendency depending on some important geometrical and material parameters such as the interlayer plate thickness, yield strength, and tensile limit for several different interlayer thickness and different elapsed time after impact by using commercial software of AUTODYN.
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