Research On The Thermoelastic Response Of Material With Intense Laser Radiation

Laser has widely used in national defence and the material processing and repair. We should study the mechanism of interaction between the laser and target material. In the future, laser weapon's development and application will be the inevitable trends, therefore, some basic researches to the laser failure mechanism is necessary. Along with the widespread application of complex material in the aerospace field, the laser irradiation mechanism is not only the complex material laser processing foundation, is also one of the basic theories of anti-laser weapon development.This paper based on the generic Fourier law, studies the target material response of temperature field and the thermal load field under the high energy laser irradiation. Considered the non-Fourier effect, the analytic expressions of the structure temperature field and the thermal load field under the multi-pulse heat flow and the rectangular constant temperature wave were deduced. What's more, the actual distributed situation of temperature field and thermal load field was computed when the non-Fourier effect was considered. In analyzes to the corresponding experiment, the destruction process and mechanism of carbon fiber resin complex material was numerical simulated, which received the laser's hot and impulsive load. In addition, the theory discussion of the laser ablation pressure and the reverse-plugging effect were carried on, and the ablation pressure formula was also obtained by numerical experiment.(1) In the pulsed heat flow boundary condition, the oscillation amplitude of temperature wave front is zero, which is calculated by both the classical Fourier theory and the generic Fourier law. And the undulatory heat flow causes the undulatory temperature field along with the time grow. However, the generic Fourier solution has a temperature invariable region, which classical Fourier solution does not exist.(2) In the rectangular constant temperature wave boundary condition, generic Fourier temperature profile exist the discontinuity point in the depth direction, which the classical Fourier solution doesn't.(3) By the comparison, we find that the Fourier solutions don't have obvious thermal shock phenomenon. But the generic Fourier solutions obtain a very steep wave front of the thermal agitation stress wave, and they have the obvious thermal shock.(4) The temperature and thermal load field simulated by the finite element method is tallied well with the computed result when the relaxed time takes for the zero. (5) When the laser eradiates carbon fiber resin complex material, because of the ablation pressure and the reverse-plugging effect, there are three stages: short inflation -rapid shrinkage -slow reversion.