@inproceedings{c40ade2fb7a44aacac2f8ea64d067af2,
title = "Constant life diagrams to prevent fatigue crack initiation in metallic beams using CFRP plates",
abstract = "The majority of fatigue strengthening studies using CFRP materials focus on reducing propagation rates of existing cracks or flaws, ignoring the crack initiation stage. However, many existing metallic bridge members do not contain existing cracks, but rather are nearing their design fatigue life wherein crack initiation is approaching. Limited research exists on the prevention of crack initiation using CFRP materials. In this paper, the use of CFRP plates with tuned degrees of pre-stress are investigated, to extend steel bridge member fatigue life (prevent crack initiation). The modified Goodman constant life diagram (CLD) is used to determine the safe regime of constant amplitude loading required to extend an existing member into the infinite fatigue-life zone. Following, the minimum level of CFRP pre-stress is determined to achieve this safe loading regime, and experimental testing of four metallic beams containing pre-stress CFRP retrofits validate the proposed method. Experimental results show that strengthening using pre-stressed CFRP plates can shift the working stresses from a finite fatigue-life zone to an infinite fatigue-life zone indefinitely preventing crack initiation.",
author = "Elyas Ghafoori and Masoud Motavalli and Alain Nussbaumer and Andrin Herwig and Prinz, {Gary S.} and Mario Fontana and Zhao, {Xiao Ling}",
year = "2014",
language = "English",
series = "Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014",
publisher = "International Institute for FRP in Construction (IIFC)",
editor = "Raafat El-Hacha",
booktitle = "Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014",
note = "7th International Conference on FRP Composites in Civil Engineering, CICE 2014 ; Conference date: 20-08-2014 Through 22-08-2014",
}