高温环境下薄壁结构声疲劳失效验证技术研究

摘要

目的：针对高温环境下薄壁结构声疲劳失效问题，研究分析薄壁结构在高温环境下的声疲劳失效特征，验证薄壁结构热声响应计算方法与疲劳寿命预估模型的有效性。方法较系统地阐述高温环境下薄壁结构声疲劳失效试验验证技术，重点总结热声疲劳试验环境建立与加载、高温环境下噪声测试、高温环境下动态响应测试和疲劳破坏寿命测试方法，并通过具体案例说明工程中试验验证方法的有效性。结果试验件在仿真计算与试验中的破坏位置一致，响应频率吻合较好，应力水平一致，疲劳寿命量级相当。结论薄壁结构热声响应计算方法与疲劳寿命预估模型的有效性高。%ObjectiveFor acoustic fatigue failure problems of thin-walled structures bearing the high temperature, the work aims to analyze and study the acoustic fatigue failure characteristics of thin-walled structures under the high temperature envi-ronment and validate the effectiveness of thermal-acoustic response calculation method and fatigue life prediction model for thin-walled structures.Methods It systematically expounded the acoustic fatigue experimental verification technology of thin-walled structures bearing the high temperature. Meanwhile, researches mainly focused on summaries for the establishment of thermal-acoustic test environment and the infliction of thermal-acoustic loads, the noise test methods in high temperature en-vironment, the test methods of dynamic response and fatigue failure life prediction methods. Specific cases were given to illu-strate the effectiveness of the experimental verification method in engineering.ResultsThere were the same break positions and good response frequencies; the stress level respectively kept a preferable consistency; and fatigue life had a good alignment in simulation and test.ConclusionThethermal-acoustic response calculation method and fatigue life prediction model has the pretty effectiveness.