A method of double-sided laser irradiation is presented for temperature control in high temperature mechanical properties test of composite materials. Based on the finite element method (FEM), a numerical model of temperature distribution of materials was established. The effects of specification, laser heating area and laser intensity,laser heating time on temperature uniformity during heating were analyzed. The results show that the laser heating area, thickness of the specimen, laser intensity and laser heating time have a decisive effect on the temperature uniformity. The limit temperature control precision reaches 2% for carbon fiber reinforced polymer(CFRP), and the heating time can be controlled in minutes. The method is especially suitable for composite materials that cannot be heated by electric induction in the traditional heating experiment of high heating rate. Furthermore, an experimental scheme of double-sided irradiation heating using a single laser beam was designed. Experiment results illustrated that the temperature control precision was high before the material appears obvious flame. This method has the advantages of rapid heating rate, high testing efficiency and high testing temperature. It can make a reference for mechanical properties test of composite materials at elevated temperature with rapid heating rate
For mechanical properties temperature dependence test in high temperature rising rate, a method of heating specimen using two-sided laser irradiation is proposed. Simulation about different materials in laser heating about different laser power density and different laser duration were conducted. The result shows that two-sided laser irradiation can obviously improve the temperature field of the specimen in normal laser irradiating. The simulation shows that this method is better for metal than composite materials because of the heating pyrolisys may have a bad influence on the thermal balance. Based on this method, the tensile strength temperature dependence of the T700 carbon fiber laminate was obtained. The result is close to the parameter obtained in electrical mechanical machine by furnace heating. The research can make a reference for the mechanical properties test of composite materials or metal in high temperature with high heating rate.
Based on the overhanging beam three-point bending method, the experimental system was set up to measure the variety of shear stiffness of Nomex honeycomb sandwich panel in laser irradiation. The shear stiffness of the specimens under different laser power density was measured. The result shows that the thermal effect during the laser irradiation leads to the degradation of mechanical properties of Nomex honeycomb sandwich panel. High temperature rise rate in the specimen is another main reason for the shear stiffness degeneration. This research provides a reference for the degradation of mechanical properties of composite materials in laser irradiation and proposes a new method for the study of laser interaction with matter.
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