An inelastic constitutive equation of fiber reinforced plastic laminates

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Journal of Engineering Materials and Technology

DOI:https://doi.org/10.1115/1.2806831· OSTI ID:634573

Kanagawa, Y; Murakami, S; Mizobe, T ^[1]

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1. Univ. of Nagoya (Japan). Dept. of Mechanical Engineering

A constitutive model for describing the time-dependent inelastic deformation of unidirectional and symmetric angle-ply CFRP (carbon Fiber Reinforced Plastics) laminates is developed. The kinematic hardening creep law of Malinin and Khadjinsky and the evolution equation of Armstrong and Frederick are extended to describe the creep deformation of initially anisotropic materials. In particular, the evolution equations of the back stresses of the anisotropic material were formulated by introducing a transformed strain tensor, by which the expression of the equivalent strain rate of the anisotropic material has the identical form as that of the isotropic materials. The resulting model is applied to analyze the time-dependent inelastic deformation of symmetric angle-ply laminates. Comparison between the predictions and the experimental observations shows that the present model can describe well the time-dependent inelastic behavior under different loadings.

• Sponsoring Organization: USDOE
• OSTI ID: 634573
• Journal Information: Journal of Engineering Materials and Technology, Journal Name: Journal of Engineering Materials and Technology Journal Issue: 1 Vol. 120; ISSN 0094-4289; ISSN JEMTA8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
CARBON FIBERS
CORRELATIONS
CREEP
EPOXIDES
MATHEMATICAL MODELS
PREDICTION EQUATIONS
STRAINS
STRESSES