Synchrotron Strain Mapping of the Residual Strain Distribution around Foreign Object Damage in Laser Shock Peened Ti-6AL-4V Alloy

Abstract:

Article Preview

The current study investigates the effect of foreign object damage (FOD) on the pre-existing compressive residual stress field associated with laser shock peening (LSP) and its evolution upon combined LCF/HCF cycling. FOD was introduced onto an aerofoil-shaped specimen that had been previously LSP treated through ballistic impacts at angles of 0° and 45° to the leading edge. It is shown that the FOD notch created by 45° impact was asymmetric in shape and smaller in depth compared to that created at 0° impact. Significant through thickness compression was introduced parallel to the leading edge as a result of the LSP process. The residual strain distribution was mapped around the FOD notch by synchrotron X-ray radiation. The results show predominantly compressive stresses ahead of the notch, being greater for the 0 compared to 45 impact. No significant stress relaxation was observed after a combined (1000 HCF cycles superimposed on 1 LCF cycle) cycle.

Info:

Periodical:

Edited by:

Y. Akiniwa, K. Akita and H. Suzuki

Pages:

19-24

DOI:

10.4028/www.scientific.net/MSF.652.19

Citation:

S. Zabeen et al., "Synchrotron Strain Mapping of the Residual Strain Distribution around Foreign Object Damage in Laser Shock Peened Ti-6AL-4V Alloy", Materials Science Forum, Vol. 652, pp. 19-24, 2010

Online since:

May 2010

Export:

Price:

$38.00

[1] B. L. Boyce, X. Chen, J. W. Hutchinson, and R. O. Ritchie: Mechanics of Materials, Vol. 33 (8)(2001), pp.441-454.

[2] P.J. Withers: Rep. Prog. Phys., Vol. 70 (2007), pp.2211-2264.

[3] G. Hammersley, L.A. Hackel, and F. Harris: Optics and Lasers in Engineering, Vol. 34 (2000), pp.327-337.

[4] R Hall, J Byrne, J Tong : Fracture Fatigue Engng Mater Struct., Vol. 31(2008), pp.386-397.

[5] P. Frankel, PhD Thesis, The University of Manchester, UK (2008).

[6] P. Frankel, J. Ding, M. Preuss, J. Byrne, and P. J. Withers: Mat. Sci. Forum (ECRS7), Vol. 524-25(2006), pp.291-296.

[7] B. L. Boyce, X. Chen, J. O. Peters, J. W. Hutchinson and R. O. Ritchie: Materials Science and Engineering A Vol. 349, Issues 1-2, (2003), pp.48-58.

In order to see related information, you need to Login.