基于均匀化激光双面辐照的热力耦合测试方法研究

In order to study the feasibility of testing the high temperature mechanical properties of materials with laser as heat source, a theoretical model and a numerical model were established to analyze the surface and internal temperature rise of materials heated by double-sided uniform laser spot. The results show that the uniform temperature field can be formed in the heating area of the specimen by using the double sided uniform laser irradiation under the ideal condition. In order to verify the above conclusions, a thermo-mechanical test platform of laser irradiation with spot uniformity of 92% is established, and the high temperature tensile strength of CFRP laminates which are difficult to be heated quickly using traditional method is obtained based on the relevant test methods. The results show that the temperature uniformity of the specimen in the test area of laser heating center (10 mm×10 mm) is good. The specimen can be rapidly heated to 923 ℃ under uniform double-sided laser irradiation, and the maximum temperature fluctuation in the test area is 6.8%. The thermo-mechanical test method based on uniform laser double-sided irradiation has many advantages such as good generality, high temperature rise rate, high test temperature and high test efficiency. It provides a key technical support for further development of a universal test system of material/structure with high temperature rise rate and high temperature mechanical properties.