Detail Creep Relaxation of Residual Stresses Around Cold Expanded Holes   Oleh:  Garcia-Granada, A. A. ; Lacarac, V. D. ; Holdway, P. ; Smith, D. J. ; Pavier, M. J. Jenis: Article from Bulletin/Magazine Dalam koleksi: Journal of Engineering Materials and Technology vol. 123 no. 1 (2001), page 125-131. Topik: BLACK HOLE; relaxation; residual stresses; cold expanded holes Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ87.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel The cold expansion of fastener holes in aircraft components is a standard technique to improve fatigue life. There is concern that the beneficial residual stresses arising from cold expansion may relax due to creep. This paper describes experimental measurement and finite element prediction of cold expansion residual stresses and their redistribution after creep, with and without additional mechanical load. Experimental measurements of near - surface stresses used an X -r ay diffraction technique while average through - the - thickness stresses were measured using a new method based on Sachs' boring. This new method allowed non - axisymmetric residual stresses to be measured, as was the case when creep relaxation occurred with mechanical load. Axisymmetric and three dimensional finite element analyses were used to predict the stress distribution through the thickness of the component showing good agreement with measurement. Creep relaxation of residual stress does indeed occur, but some benefit of the cold expansion remains, particularly when creep relaxation is combined with the application of mechanical load. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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