高速冲切诱发应变能瞬态释放动力效应
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摘要
建立了弹-靶冲切模型,通过数值模拟获得了应力瞬态卸荷条件下靶板能量的变化过程;提出了考虑时间效应的能量释放速率指标,建立了以能量释放速率为核心的能量破坏准则,揭示了应力瞬态卸荷条件下靶板的破坏机理;同时,分析了靶板损伤程度与卸荷速率的关系.研究表明:在高速冲切诱发的应力瞬态卸载条件下,靶板中的能量呈现出动态波动的特征,应变能先减小后增大最后趋于稳定,动态变化过程中产生动力峰值.能量快速释放是导致靶板破坏的重要机理之一,在40MPa的应力水平下,能量瞬态释放可使靶板损伤区范围增大4.8%～11.9%.
Projectile-target punching model was set up to get the changes of energy through numerical simulation under transient unloading conditions.By considering the time effect of energy release,the index of energy release velocity was proposed, the energy failure criterion was established based on energy release velocity,and the failure mechanism of target plate under transient stress unloading was revealed.Meanwhile, the relationship between target damage scope and unloading rate was analyzed.Research shows that under the condition of stress transient unloading induced by high-speed punching,the energy in the target plate fluctuates dynamically,and the strain energy can be reduced first,then increases and finally tends to be stable,and the dynamic peak is generated during the changing process.High-speed release of energy in the punching process is one of the important mechanisms that cause the failure of the target.Under the stress level of 40 MPa,the energy transient release can increase the damage range of the plate by 4.8%～11.9%.
Projectile-target punching model was set up to get the changes of energy through numerical simulation under transient unloading conditions.By considering the time effect of energy release,the index of energy release velocity was proposed, the energy failure criterion was established based on energy release velocity,and the failure mechanism of target plate under transient stress unloading was revealed.Meanwhile, the relationship between target damage scope and unloading rate was analyzed.Research shows that under the condition of stress transient unloading induced by high-speed punching,the energy in the target plate fluctuates dynamically,and the strain energy can be reduced first,then increases and finally tends to be stable,and the dynamic peak is generated during the changing process.High-speed release of energy in the punching process is one of the important mechanisms that cause the failure of the target.Under the stress level of 40 MPa,the energy transient release can increase the damage range of the plate by 4.8%～11.9%.
引文
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[20]向鹏,纪洪广,蔡美峰,等.抛掷型岩爆震源体能量动态释放机制与几何尺度特征[J].岩土力学,2018,39(2):457-466.
[2]YARIN A L,RUBIN M B,ROISMAN I V.Penetration of a rigid projectile into an elastic-plastic target of finite thickness[J].International Journal of Impact Engineering,1995,16(5/6):801-831.
[3]GRAN J K,FREW D J.In-target radial stress measurements from penetration experiments into concrete by ogive-nose steel projectiles[J].International Journal of Impact Engineering,1997,19(8):715-726.
[4]徐伟芳,张方举,陈裕泽,等.混凝土薄板的侵彻破坏响应实验[J].爆炸与冲击,2013,33(2):169-174.
[5]GUPTA N K,ANSARI R,GUPTA S K.Normal impact of ogive nosed projectiles on thin plates[J].International Journal of Impact Engineering,2001,25(7):641-660.
[6]纪伟,范亚夫.镁合金靶板在球形弹丸侵彻过程中的破坏分析[J].兵器材料科学与工程,2009,32(2):89-92.
[7]郭秋萍,焦志刚,刘宗超,等.尖卵形弹丸侵彻薄靶板数值模拟[J].沈阳理工大学学报,2011,30(6):57-61.
[8]董军,邓国强,杨科之,等.弹丸对混凝土薄板的冲击破坏效应[J].岩石力学与工程学报,2005,24(4):713-720.
[9]WEN H M,JONES N.Semi-empirical equations for the perforation of plates struck by a mass[C]//Structures Under Shock and ImpactⅡ:Proceedings of the Second International Conference.Portsmouth:Thomas Telford Publishing,1992:369-380.
[10]GARCíACASTILLO S K,SáNCHEZSáEZ S,BARBERO E,et al.Response of pre-loaded laminate composite plates subject to high velocity impact[J].Journal de Physique IV,2006,134(1):1257-1263.
[11]HOLMQUIST T J,JOHNSON G R.Modeling prestressed ceramic and its effect on ballistic performance[J].International Journal of Impact Engineering,2005,31(2):113-127.
[12]GARCíA-CASTILLO S K,SáNCHEZ-SáEZ S,BARBERO E.Behaviour of uniaxially preloaded aluminium plates subjected to high-velocity impact[J].Mechanics Research Communications,2011,38(5):404-407.
[13]郭然.有岩爆倾向深埋硬岩矿床采矿理论及其应用研究[D].长沙:中南工业大学图书馆,2000.
[14]肖福坤,刘刚,申志亮.桃山90#煤层有效弹性能量释放速度研究[J].岩石力学与工程学报,2015,34(S2):4216-4225.
[15]华安增.地下工程周围岩体能量分析[J].岩石力学与工程学报,2003,22(7):1054-1059.
[16]刘宁,张春生,褚卫江,等.深埋隧洞岩爆风险尺寸效应问题探讨[J].岩石力学与工程学报,2017,36(10):2514-2521.
[17]苏国韶,冯夏庭,江权,等.高地应力下地下工程稳定性分析与优化的局部能量释放率新指标研究[J].岩石力学与工程学报,2006,25(12):2453-2460.
[18]JIANG Q,FENG X T,XIANG T B,et al.Rockburst characteristics and numerical simulation based on a new energy index:a case study of a tunnel at 2500m depth[J].Bulletin of Engineering Geology&the Environment,2010,69(3):381-388.
[19]王耀辉,陈莉雯,沈峰.岩爆破坏过程能量释放的数值模拟[J].岩土力学,2008,29(3):790-794.
[20]向鹏,纪洪广,蔡美峰,等.抛掷型岩爆震源体能量动态释放机制与几何尺度特征[J].岩土力学,2018,39(2):457-466.