锁相红外热成像技术应用于复合材料连接接头全场应力测量研究

为了克服传统电测法测量结构应力的种种不足，文章对应用锁相红外热成像技术进行复合材料结构应力测量的可行性进行了研究。在研究中，首先结合正交各向异性复合材料的热弹性理论（TSA），提出了一种有效而又简洁的试验标定方法，并通过标定试验获取了文中所用玻璃钢材料所需的合理的加载频率f以及标定参数K，然后对两种典型的船用玻璃钢复合材料连接接头内的应力分布进行了测量，通过与数值计算结果的对比，验证了锁相红外热成像技术是一种快速、高效和可靠的结构全场应力测量手段。

Measuring Stress Distributions of Composite Joints by Lock-In Infrared Thermography Technique

Bonded connections between two structural members represent a potential weakness in the context of FRP materials. Due to their complex geometry configurations, stress distribution is normally difficult to measure by the traditional electromotive measuring way. In this paper, a new method of Lock-In infrared thermography technique was introduced to measure the stress distributions of those joints of composite materials. Testing samples in the research included two different types of joints, laminated composite tee-joints and composites-to-steel hybrid joints. Feasibility and credibility of using the Lock-In infrared thermography technique to measure stress distributions of complex struc-tures were investigated by comparing the experimental results with the numerical analyses. The re-sults show that this new technique can rapidly and effectively determine global stress distributions of complex structures such as composite joints.