Stress Evaluation with Non-Linear Guided Waves

本项目计划研究一种基于非线性导波内部共振现象的结构应力原位测量新方法。监测结构关键构件的应力水平对保证结构安全具有重要意义。该项目计划推导出这种内部共振的要求及其对应力的依赖，并在简单波导和更现实的结构中进行实验验证。预期的结果是证明了一种新的廉价方法的可行性，用于连续监测应用或热诱导应力，这在一些工程环境中非常重要，例如现代铁路轨道轨道，管道或混凝土结构中的预应力链。

This project plans to investigate a novel approach for in situ measurement of stress in structures based on an internal resonance phenomenon for nonlinear guided waves. Monitoring the stress level of critical structural components is important to ensure structural safety. The project plans to derive the requirements for this internal resonance and its dependence on stress analytically and verify them experimentally for both simple waveguides and more realistic structures. The expected outcome is the demonstration of the feasibility of a new inexpensive method for continuous monitoring of applied or thermally-induced stresses, which is of great importance in several engineering contexts, such as modern railway track rails, pipelines or pre-stressed strands in concrete structures.