發(fā)布時間：2018-05-15 02:42

  本文選題：紅外成像技術(shù) + 第三代鋁鋰合金�。� 參考：《科學技術(shù)與工程》2017年19期

【摘要】：紅外成像技術(shù)提供了一種快速、非接觸、全區(qū)域的表面溫度監(jiān)測手段。在超聲疲勞試驗中,大多數(shù)金屬材料均具有明顯的溫度效應。將采用這種技術(shù)手段系統(tǒng)地對鋁鋰合金2198-T8材料在疲勞試驗過程中的升溫情況開展研究。結(jié)果表明,材料從試驗開始到疲勞斷裂現(xiàn)象的發(fā)生,試件表面溫度通常要經(jīng)歷三個階段:快速升溫階段、緩慢升溫階段和急劇升溫階段�？焖偕郎仉A段通常與施加應力的大小有關(guān);施加應力和疲勞微裂紋萌生是緩慢升溫階段的主要影響因素;宏觀裂紋的擴展以及裂紋面之間的碰撞和摩擦則可導致材料表面的急劇升溫。驗證了紅外成像技術(shù)在探索疲勞失效規(guī)律問題上作為一種可靠技術(shù)手段的正確性。
[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.
【作者單位】： 中國民航飛行學院計算機學院;四川大學空天科學與工程學院;
【基金】：國家自然科學基金(11327801,U1433127) 教育部國家公派留學基金(2016) 四川省教育廳項目(16ZB0034) 中國民航飛行學院科研基金(F2014KF01,J2015-38) 大學生創(chuàng)新訓練項目(201610624007)資助
【分類號】：TG146.21;TN219
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本文編號：1890643