TY - JOUR
T1 - Stiffness degradation model for biaxial braided composites under fatigue loading
AU - Tate, Jitendra S.
AU - Kelkar, Ajit D
PY - 2008/4/1
Y1 - 2008/4/1
N2 - Biaxial braided composites are gaining popularity, in particular for the small business jets, where FAA requires take off weights of 5670 kgf (12,500 lb). In the present research carbon/epoxy biaxial braided composites were manufactured using low cost vacuum assisted resin transfer molding (VARTM). Extensive tension-tension fatigue tests were performed on biaxial braided carbon/epoxy composites for various braid angles. Experimental data clearly indicated that S-N diagram could be represented by Sigmoidal function. This paper specifically addresses stiffness degradation of braided composites with braid angle of 25°. In addition to Sigmoidal function, it was observed that the three stages of stiffness degradation curve can be represented by Bradley function. Sigmoidal function in conjunction with Bradley function is explored to predict the fatigue life and the residual fatigue modulus. © 2007 Elsevier Ltd. All rights reserved.
AB - Biaxial braided composites are gaining popularity, in particular for the small business jets, where FAA requires take off weights of 5670 kgf (12,500 lb). In the present research carbon/epoxy biaxial braided composites were manufactured using low cost vacuum assisted resin transfer molding (VARTM). Extensive tension-tension fatigue tests were performed on biaxial braided carbon/epoxy composites for various braid angles. Experimental data clearly indicated that S-N diagram could be represented by Sigmoidal function. This paper specifically addresses stiffness degradation of braided composites with braid angle of 25°. In addition to Sigmoidal function, it was observed that the three stages of stiffness degradation curve can be represented by Bradley function. Sigmoidal function in conjunction with Bradley function is explored to predict the fatigue life and the residual fatigue modulus. © 2007 Elsevier Ltd. All rights reserved.
KW - A. Polymer-matrix composites (PMCs)
KW - B. Fatigue
KW - C. Analytical modelling
KW - Vacuum assisted resin transfer molding (VARTM)
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U2 - 10.1016/j.compositesb.2007.03.001
DO - 10.1016/j.compositesb.2007.03.001
M3 - Article
SN - 1359-8368
VL - 39
SP - 548
EP - 555
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
IS - 3
ER -