TY - JOUR
T1 - Process-induced residual stress analysis of AS4/3501-6 composite material
AU - White, Scott R.
AU - Kim, Yeong
N1 - Funding Information:
The authors wish to thank the Office of Naval Research for their support of this research, nnd the National Science Foundation for a supercomputing grant at the National Center for Supercomputing Applications (NCSA) at the University of Illinois. Special thanks are extended to Profs. Philippe Geubelle and Nancy Sottos at the University of Illinois for technical advice and assistance.
PY - 1998
Y1 - 1998
N2 - The development of process-induced residual stresses in a typical graphite/epoxy composite material during cure is analyzed in this article. An extensive material characterization study of the resin system was reported in a previous article by the authors [1], and the results of that study are used to develop a cure-dependent viscoelastic material model for the composite system. A finite-element model is developed to solve the stress analysis problem. To overcome large memory storage requirements and lengthy calculation times, a recursive formulation is used in the finite-element analysis. Cure kinetic and heat transfer modeling are evaluated independently using the finite-difference method. Process-induced residual stresses in cross-ply laminates are calculated and the results are compared with elastic solutions. The results of the analysis indicate that in certain cases significant residual stresses are present during the cure cycle, even before final cool-down commences. Whether a material experiences significant curing stress before cool-down depends on many factors, including stress relaxation time, equilibrium modulus, the level of chemical shrinkage, and curing conditions.
AB - The development of process-induced residual stresses in a typical graphite/epoxy composite material during cure is analyzed in this article. An extensive material characterization study of the resin system was reported in a previous article by the authors [1], and the results of that study are used to develop a cure-dependent viscoelastic material model for the composite system. A finite-element model is developed to solve the stress analysis problem. To overcome large memory storage requirements and lengthy calculation times, a recursive formulation is used in the finite-element analysis. Cure kinetic and heat transfer modeling are evaluated independently using the finite-difference method. Process-induced residual stresses in cross-ply laminates are calculated and the results are compared with elastic solutions. The results of the analysis indicate that in certain cases significant residual stresses are present during the cure cycle, even before final cool-down commences. Whether a material experiences significant curing stress before cool-down depends on many factors, including stress relaxation time, equilibrium modulus, the level of chemical shrinkage, and curing conditions.
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U2 - 10.1080/10759419808945897
DO - 10.1080/10759419808945897
M3 - Article
AN - SCOPUS:0032394771
VL - 5
SP - 153
EP - 186
JO - Mechanics of Advanced Materials and Structures
JF - Mechanics of Advanced Materials and Structures
SN - 1521-0596
IS - 2
ER -