Application of LCR Waves to Inspect Aircraft Structures
Final rept. 15 Apr 2010-14 Apr 2013
UNIVERSIDADE ESTADUAL DE CAMPINAS (BRAZIL)
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The stresses and strains imposed on mechanical components can result in mechanical failures. Such stresses can be applied, pre-existed, or both. The pre-existed stresses, also known as residual stresses, result from internal residual strain caused by elastic energy within the mechanical element. In metals, they are generated during the thermomechanical processing of the material or loading in service. In composites, the concept is not the same and residual stresses are not expected to perform a role as significant as for the metals in the failure process. Notwithstanding, for both type of materials, the applied stresses in service plays an important role in the expected life. This study aimed to evaluate stress in aircraft structural components based on the acoustoelectric effect. The study concentrated efforts in the structural materials, emphasizing Aluminum and composites. The method used Lcr waves p-waves as the main tool. The final objective was to evaluate the suitability of such method to be used on-board in the future, after further development.