摘要
为了得到更准确的飞机鸟撞分析模型,基于显式有限元分析程序PAM-CRASH建立了LY12-CZ铝合金平板的鸟撞数值模型.采用Johnson-Cook方程表述LY12-CZ材料的本构.LY12-CZ铝合金在4种不同应变率下的应力-应变曲线通过电子万能试验机和分离式霍普金森拉杆(SHTB)拉伸试验获得,对曲线进行拟合得到Johnson-Cook方程中的4个常数.基于光滑粒子流体动力学(SPH)方法建立了鸟体模型,引入Monaghan EOS方程来描述鸟体材料.针对所建立的鸟撞数值计算模型,开展相对应的鸟撞试验,获得测试点的应变,并将数值计算结果和试验结果进行对比.结果表明:计算应变与试验测得的应变吻合较好,验证了鸟体、铝合金本构模型以及鸟体高速冲击计算分析模型的合理性、可靠性.
To obtain the accurate analysis model of bird impact for aircraft structures,the numerical model of bird impact on LY12-CZ aluminum alloy flat plates was established based on the explicit finite element code of PAM-CRASH. Johnson-Cook equation was adopted to describe the constitutive model of LY12-CZ aluminum alloy. The stress-strain curves at 4 different strain rates of LY12-CZ were measured by dynamic tensile tests using electronic universal testing machine and split Hopkinson tensile bar( SHTB),and four constants in Johnson-Cook equation were fitted. Bird was modeled by smooth particle hydrodynamics( SPH) method, and Monaghan EOS equation was introduced to simulate the bird material. Two corresponding bird impact experiments were implemented,and the strains of testing points were obtained. The calculation results were compared with the bird impact experimental results. The results show that the good agreement between numerical calculation and experimental results is obtained,which illuminates the bird constitutive model,the aluminum alloy constitutive model and the calculation method for high speed are reasonable and reliable.
出处
《江苏大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第4期418-422,共5页
Journal of Jiangsu University：Natural Science Edition
基金
上海高校青年教师培养计划项目
上海师范大学校级科研基金资助项目(SK201509)
关键词
鸟撞
本构模型
SHTB
光滑粒子流体动力学
试验
数值计算
bird impact
constitutive model
SHTB
smooth particle hydrodynamics
experiment
numerical calculation
