基于红外成像技术的铝锂合金2198疲劳裂纹监测机制研究
发布时间:2018-05-15 02:42
本文选题:红外成像技术 + 第三代铝锂合金 ; 参考:《科学技术与工程》2017年19期
【摘要】:红外成像技术提供了一种快速、非接触、全区域的表面温度监测手段。在超声疲劳试验中,大多数金属材料均具有明显的温度效应。将采用这种技术手段系统地对铝锂合金2198-T8材料在疲劳试验过程中的升温情况开展研究。结果表明,材料从试验开始到疲劳断裂现象的发生,试件表面温度通常要经历三个阶段:快速升温阶段、缓慢升温阶段和急剧升温阶段。快速升温阶段通常与施加应力的大小有关;施加应力和疲劳微裂纹萌生是缓慢升温阶段的主要影响因素;宏观裂纹的扩展以及裂纹面之间的碰撞和摩擦则可导致材料表面的急剧升温。验证了红外成像技术在探索疲劳失效规律问题上作为一种可靠技术手段的正确性。
[Abstract]:Infrared imaging provides a rapid, non-contact, whole-area surface temperature monitoring tool. In ultrasonic fatigue test, most metal materials have obvious temperature effect. The temperature rise of Al-Li alloy 2198-T8 material during fatigue test will be studied systematically by this technique. The results show that from the beginning of the test to the occurrence of fatigue fracture, the surface temperature of the specimen usually goes through three stages: fast heating stage, slow heating stage and sharp heating stage. The rapid heating stage is usually related to the magnitude of the applied stress, and the stress and fatigue microcrack initiation are the main influencing factors in the slow heating stage. The macroscopic crack propagation and the collision and friction between the crack surfaces can lead to the sharp heating of the material surface. The correctness of infrared imaging as a reliable technique in exploring fatigue failure law is verified.
【作者单位】: 中国民航飞行学院计算机学院;四川大学空天科学与工程学院;
【基金】:国家自然科学基金(11327801,U1433127) 教育部国家公派留学基金(2016) 四川省教育厅项目(16ZB0034) 中国民航飞行学院科研基金(F2014KF01,J2015-38) 大学生创新训练项目(201610624007)资助
【分类号】:TG146.21;TN219
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本文编号:1890643
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