线状脉冲激光激发双层圆柱的波传播

该文建立了一个物理模型来预测均匀、各向同性双层固体圆柱在激光烧蚀或热弹激发下的弹性波传播规律.在建模中忽略了激光源的光学穿透和材料的热扩散.采用空间和时间上的双重傅氏变换对理论模型进行求解,得到其位移场的变换解.通过对铝壳铜芯和铜壳铝芯的数值计算,得到不同内外径比下瞬态位移响应的时域和频域数值波形.用传播路径分析发现结果中存在界面反射波,这可以表明所建立的理沦模型和计算方法是有效的,同时其余波的传播也被分析和解释.

PROPAGATION OF WAVES EXCITED BY LASER LINE PULSE IN A TWO-LAYERED CYLINDER

In this paper, a physical model is proposed to predict the propagation of elastic waves, which are excited by a laser line source in a homogeneous, isotropic two-layered cylinder under either the ablation or thermoelastic regime. The thermal diffusion of the material and the optical penetration of the laser source are neglected in modeling. Double Fourier transform over space and time is introduced to obtain the analytical solution of the theoretical modeling. Numerical transient displacement responses in time and frequency domain are obtained for aluminum shell and copper core or copper shell and aluminum core with various ratios of internal to external diameters. Interface reflected waves are identified by the ray trajectory analysis, which may demonstrate the validness of the theoretical model and solution, and other waves are also analyzed and commented.