摘要
明胶鸟弹在不同撞击速度下表现出不同的响应特性。为解决传统明胶鸟弹本构表征方法在不同速度范围内不能通用的问题,开展了330 g明胶鸟弹以70~190 m/s速度、60°或90°入射刚性铝合金平板试验,记录了冲击力数据及撞击形貌。结果表明,随着撞击速度的提高,鸟弹碎裂得更充分,碎块体积减小。利用LS-DYNA建立了自适应FEM-SPH(finite element method-smoothed particle hydrodynamics)鸟体模型。依据试验结果反演得到一组鸟体本构参数:切线模量为1.33MPa,剪切模量为115.95MPa,Murnaghan状态方程参数γ为10.49,k_(0)为69.77 MPa,体积模量为246.4 MPa,失效塑性应变为1.15,初始屈服应力为0.21 MPa。仿真结果与试验结果具有很好的一致性,冲击力峰值的相对误差在2%以内,冲量的相对误差在10%以内。自适应FEM-SPH鸟体模型具有比SPH模型和拉格朗日模型更高的精度。由自适应模型得到的Hugoniot压强与理论结果具有相同的变化趋势,滞止压强与理论值较接近。
Previous studies revealed that gelatin birds show different mechanical behaviors at different impact velocities.In order to solve the problem that the traditional constitutive methods of gelatin bird cannot be universal in different velocity ranges,the tests of 330 g gelatin birds impacting rigid aluminum alloy plate at 60°and 90°incident angles,covering a velocity range of 70−190 m/s were carried out to record the impact force data and impact morphology.With the increase of velocity,the birds were broken more fully and smaller fragments were observed.The adaptive FEM-SPH(finite element method-smoothed particle hydrodynamics)model of bird was established in LS-DYNA,and a set of constitutive parameters were inverted according to the test results:tangent modulus equals to 1.33 MPa,shear modulus equals to 115.95 MPa,the parameters of Murnaghan equation of stateγequals to 10.49,k_(0) equals to 69.77 MPa,bulk modulus equals to 246.4 MPa,failure plastic strain is 1.15,yield stress is 0.21 MPa.The simulation results were in good agreement with the test results,and had higher accuracy compared to the SPH models and the Lagrangian models.The Hugoniot pressure of the adaptive model had the same change trend as the theoretical value,and the stagnation pressure was close to the theoretical value.
作者
彭鸿博
侯润峰
李旭阳
王计真
白春玉
石霄鹏
PENG Hongbo;HOU Runfeng;LI Xuyang;WANG Jizhen;BAI Chunyu;SHI Xiaopeng(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;Sino-European Institute of Aviation Engineering,Civil Aviation University of China,Tianjin 300300,China;Aircraft Strength Research Institute of China,Xi’an 710000,Shaanxi,China;Science and Technology Innovation Research Institute,Civil Aviation University of China,Tianjin,300300,China)
出处
《高压物理学报》
CAS
CSCD
北大核心
2024年第5期172-186,共15页
Chinese Journal of High Pressure Physics
基金
中央高校基本科研业务费专项资金(31220200069)。
关键词
鸟撞
明胶鸟弹
自适应
有限元法
光滑粒子流体动力学
本构参数识别
bird impact
gelatin bird
adaptive
finite element method
smoothed particle hydrodynamics
constitutive parameters identification
