2014, (2): 85-89.
doi: 10.11729/syltlx2014pz29
Abstract:
To study the influence of attack angle on the process of tungsten rod oblique pene-trating aluminum plate,numerical simulation is carried out.In the simulation,SPH method is a-dopted,with Shock Equation of State and Steinberg strength model.The tungsten rod has twodifferent sizes,which areΦ1 0mm×2 3mm andΦ1 0mm×46mm.The thickness of aluminum plateis 1 0mm.The impact velocity is 2km/s,the impact angle is 60°.The attack angle consists ofpitch angle and yaw angle,the influences of each are studied separately.The pitch angle variesfrom-90°to 90°,and the yaw angle varies form 0°to 90°.The rotation and bending of the tung-sten rod are analyzed,the result shows that:the critical attack angle exists in the oblique pene-tration,within the scope of the critical attack angle,the moment of tungsten rod can be neglec-ted,and the tungsten rod doesn’t rotate or bend during the penetration process;outside thescope of the critical attack angle,the moment of the tungsten rod can’t be neglected,which canbend or even break the tungsten rod.The residual mass and residual velocity of the tungsten rodafter penetration are analyzed,the result shows that:when the yaw angle is 0°,the residual masskeeps at a small range unless the rod is broken,and the tungsten rod with L/Dratio of 4.3 iseasier to be broken than the tungsten rod with L/Dratio of 2 .3 ;when the pitch angle is 0°,theresidual mass decreases linearly as the yaw angle varies from 20°to 80°;for the tungsten rod withL/Dration of 2 .3 ,the fitted residual velocity-attack angle curve at 0° yaw angle overlaps thecurve at 0°pitch angle,which means the yaw angle and the pitch angle has the same influence on theresidual velocity of the tungsten rod;when the yaw angle is 0°,the residual velocity-attack angle curve ofdifferentL/Dratios shares the same shape,thus a uniform empirical formula of the residual velocity ofdifferentL/Dratios is constructed,the constant in the empirical formula is obtained by curve fitting.
