Evolution of a laser shock peened residual stress field locally with foreign object damage and subsequent fatigue crack growth
Evolution of a laser shock peened residual stress field locally with foreign object damage and subsequent fatigue crack growth
复制标题
DOI：
10.1016/j.actamat.2014.09.032
复制
发表时间：
2015-01-15
期刊：
影响因子：
9.4
通讯作者：
Withers, P. J.
中科院分区：
文献类型：
--
作者：
Zabeen, S.;Preuss, M.;Withers, P. J.
异物损伤(FOD)会严重缩短构件的疲劳寿命。另一方面，激光冲击喷丸通过在部件中引入深度压缩残余应力来提高疲劳寿命。本文研究了在高周疲劳和高低周混合疲劳条件下，激光冲击翼型前缘FOD引起的不均匀陡峭残余应力分布随疲劳裂纹扩展的变化规律。弹道FOD撞击是通过与前缘正面撞击立方体边缘(与前缘成0度角)来引入的。用同步辐射X射线衍射仪测定了裂纹扩展前、短裂纹(接近1 mm)和长裂纹(长达6 mm)扩展后的残余应力分布。结果表明，局部残余应力场对较长裂纹的扩展具有很高的稳定性。(C)2014 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
Foreign object damage (FOD) can seriously shorten the fatigue lives of components. On the other hand, laser shock peening improves fatigue life by introducing deep compressive residual stress into components. In this paper we examine how the non-uniform steep residual stress profile arising from FOD of laser peened aerofoil leading edges varies as a function of fatigue crack growth under high cycle fatigue and mixed high and low cycle fatigue conditions. The ballistic FOD impacts were introduced by impacting a cube edge head-on (at an angle of 0 degrees) to the leading edge. The residual stress distributions have been mapped by synchrotron X-ray diffraction prior to cracking and subsequent to short (similar to 1 mm) and long (up to 6 mm) crack growth. The results suggest that the local residual stress field is highly stable even to the growth of relatively long cracks. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.