Material Lifeing Using Nonlinear Ultrasound

本项目涉及材料疲劳和蠕变损伤超声检测技术的发展。这一发展将允许在发电厂和航空发动机的早期阶段检测损坏，从而能够在更长的时间内安全地运行这些系统。超声与材料非线性的非共线相互作用由于其巨大的实际应用潜力而将得到开发和应用。通过建模和实验，非线性检测技术的发展和比较，将为学术和工业用户提供非线性超声检测技术的相对性能水平和实用性的清晰，明确的描述，帮助未来的用户做出最佳决策。最后，在真实的世界样本上对该方法进行测试，将证实其实用性。其结果将是了解如何非线性超声技术可以用来检测以前无法检测到的样本中的损坏，并预测在组件的剩余寿命。

This project is concerned with the development of ultrasonic techniques for the detection of fatigue and creep damage in materials. This development will allow the detection of damage at earlier stages in power plants and aero engines, resulting in the ability to operate these systems safely for much greater periods. The noncollinear interaction of ultrasound with material nonlinearity will be developed and employed due to its great potential for practical applications. The development and comparison of nonlinear inspection techniques, through modelling and experiment, will provide academic and industrial users with a clear, unambiguous description of the relative performance levels and usefulness of nonlinear ultrasonic inspection techniques, helping future users make the best decisions as to which approach to apply. Finally the testing of this approach on real world samples will confirm its practical applicability. The result will be an understanding of how nonlinear ultrasonic techniques can be used to detect previously undetectable damage in specimens and predict the remaining life in components.