高温环境下薄壁结构声疲劳失效验证技术研究

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。

Research on Acoustic Fatigue Failure Verification Technology of Thin-walled Structure Under High Temperature Environment

For acoustic fatigue failure problems, the acoustic fatigue failure characteristics of thin-walled structures under the high temperature environment were analyzed and studied. Further, it systematically expounded the acoustic fatigue experimental verification technology of thin-walled structures bearing the high temperature. Meanwhile, researches were 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 environment, the test methods of dynamic response and fatigue failure life prediction methods. Given the specific case to illustrate the effectiveness of the experimental verification method in engineering.