钛合金高周疲劳特性的影响因素分析

Effect Factors Analysis of High Cycle Fatigue Performance of Titanium Alloy

高周疲劳(HCF)亦称高循环疲劳,它是航空燃气涡轮发动机的主要失效方式之一。高周疲劳失效几乎涉及航空发动机每一个钛合金零件,如压气机叶片、压气机内环和机匣等,会导致发动机重要部件的过早失效,甚至整个发动机和飞机的损失。但仅研究高周疲劳并不能解决实质问题,必须研究各种损伤对钛合金材料高周疲劳特性的影响。损伤通常包含低周疲劳、外物损伤、在缺口或应力集中处形成裂纹和接触疲劳等,这些损伤都可能降低高周疲劳性能。本文主要介绍和总结了国内外有关低周疲劳和外物损伤对钛合金高周疲劳特性影响的研究现状。

High cycle fatigue is one of the main failure modes of the aero gas turbine engines. High-cycle fatigue failure almost involves in every, titanium alloy component of aem-engine, such as compressor blades, compressor inner ring and casing, and so on. It can lead to the premature failure of major engine components and even lead to the loss of engines and aircraft. However, only studying high-cycle fatigue does not solve the substantive issues. We have to study variety of damages which affect the high cycle fatigue performance of titanium alloy material. Damages involve low cycle fatigue, foreign object damage, at the notch and the stress concentration form crack and fretting fatigue, etc. All these are likely to degenerate high cycle performance. This paper main introduces and summarizes the present situation of the relevant domestic and foreign research about low cycle fatigue and foreign object damage effect high cycle fatigue performance of titanium alloy.