Thin-walled tubular specimens, made from woven-roving glass fiber-reinforced polyester (GFRP) with two fiber orientations, and were tested under torsional fatigue tests at negative stress ratios 0. The mean-amplitude diagram of the specimens was found to be divided into two regions; region (1) in which the mean stress is ineffective and region (2) in which the mean stress has a detrimental effect on the amplitude component. All examined failure criteria were found to be valid for the specimens, without any modifications; using the amplitude component and the corresponding fatigue strength in region (1), and the equivalent static stress with the corresponding static strength in region (2). For the specimens, having the mean stress being effective in the whole mean-amplitude diagram, the equivalent static stress was used with the corresponding static strength in different failure criteria. None of the available criteria succeeded in predicting failure for the studied case; consequently, was introduced, which a new modifying term was introduced, which made Norris-Distortional, Tsai-Hahn, and Tsai-Hill criteria suitable for this case.
A New Failure Criterion for Woven-Roving Fibrous Composites Subjected to Tension-Compression Local Plane Stresses With Different Stress Ratios
Manuscript received July 25, 2003; revision received July 20, 2004. Review conducted by: G. Newaz.
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Nasr, M., Abouelwafa , M. N., Gomaa , A., Hamdy , A., and Morsi, E. (February 22, 2005). "A New Failure Criterion for Woven-Roving Fibrous Composites Subjected to Tension-Compression Local Plane Stresses With Different Stress Ratios ." ASME. J. Eng. Mater. Technol. January 2005; 127(1): 130–135. https://doi.org/10.1115/1.1839191
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