实验流体力学
實驗流體力學
실험류체역학
JOURNAL OF EXPERIMENTS IN FLUID MECHANICS
2014年
2期
85-89
,共5页
迎角%钨杆%斜侵彻%数值仿真%剩余质量%剩余速度
迎角%鎢桿%斜侵徹%數值倣真%剩餘質量%剩餘速度
영각%오간%사침철%수치방진%잉여질량%잉여속도
attack angle%tungsten rod%numerical simulation%residual mass%residual velocity
为研究迎角对钨杆斜侵过程的影响，开展了带迎角钨杆斜侵彻铝板数值仿真研究。仿真中采用SP H 方法，Shock状态方程和Steinberg本构模型。钨杆共有两种尺寸，分别为Φ10mm×23mm和Φ10mm×46mm。铝板厚10mm，撞击速度为2km/s，撞击角度为60°。为简化分析，将迎角分解为俯仰角和偏航角，其中俯仰角范围为-90°～90°，偏航角范围为0°～90°。对钨杆侵彻过程的分析结果表明：斜侵彻存在临界迎角，在临界迎角范围内钨杆所受力矩可忽略不计；在临界迎角范围外，钨杆将发生弯曲甚至折断。对钨杆的剩余质量分析结果表明：当偏航角为0°且钨杆未折断时，剩余质量只在较小的范围内变化；当俯仰角为0°时，剩余质量随迎角增加线性减小。对钨杆的剩余速度分析结果表明：偏航角对剩余速度的影响与俯仰角对剩余速度的影响基本一致，剩余速度曲线关于0°迎角基本对称。根据仿真结果，采用曲线拟合的方法给出了钨杆斜侵彻铝板的剩余速度经验公式。
為研究迎角對鎢桿斜侵過程的影響，開展瞭帶迎角鎢桿斜侵徹鋁闆數值倣真研究。倣真中採用SP H 方法，Shock狀態方程和Steinberg本構模型。鎢桿共有兩種呎吋，分彆為Φ10mm×23mm和Φ10mm×46mm。鋁闆厚10mm，撞擊速度為2km/s，撞擊角度為60°。為簡化分析，將迎角分解為俯仰角和偏航角，其中俯仰角範圍為-90°～90°，偏航角範圍為0°～90°。對鎢桿侵徹過程的分析結果錶明：斜侵徹存在臨界迎角，在臨界迎角範圍內鎢桿所受力矩可忽略不計；在臨界迎角範圍外，鎢桿將髮生彎麯甚至摺斷。對鎢桿的剩餘質量分析結果錶明：噹偏航角為0°且鎢桿未摺斷時，剩餘質量隻在較小的範圍內變化；噹俯仰角為0°時，剩餘質量隨迎角增加線性減小。對鎢桿的剩餘速度分析結果錶明：偏航角對剩餘速度的影響與俯仰角對剩餘速度的影響基本一緻，剩餘速度麯線關于0°迎角基本對稱。根據倣真結果，採用麯線擬閤的方法給齣瞭鎢桿斜侵徹鋁闆的剩餘速度經驗公式。
위연구영각대오간사침과정적영향，개전료대영각오간사침철려판수치방진연구。방진중채용SP H 방법，Shock상태방정화Steinberg본구모형。오간공유량충척촌，분별위Φ10mm×23mm화Φ10mm×46mm。려판후10mm，당격속도위2km/s，당격각도위60°。위간화분석，장영각분해위부앙각화편항각，기중부앙각범위위-90°～90°，편항각범위위0°～90°。대오간침철과정적분석결과표명：사침철존재림계영각，재림계영각범위내오간소수력구가홀략불계；재림계영각범위외，오간장발생만곡심지절단。대오간적잉여질량분석결과표명：당편항각위0°차오간미절단시，잉여질량지재교소적범위내변화；당부앙각위0°시，잉여질량수영각증가선성감소。대오간적잉여속도분석결과표명：편항각대잉여속도적영향여부앙각대잉여속도적영향기본일치，잉여속도곡선관우0°영각기본대칭。근거방진결과，채용곡선의합적방법급출료오간사침철려판적잉여속도경험공식。
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.
