Fully-Modeled Unit Cell Analysis for Macro/Micro Elastic-Viscoplastic Behavior of Quasi-Isotropic CFRP Laminates

Abstract:

A fully-modeled unit cell analysis is performed to investigate the macroscopic and microscopic elastic-viscoplastic behaviors of a quasi-isotropic carbon fiber-reinforced plastic (CFRP) laminate. To this end, a quasi-isotropic CFRP laminate and its microstructure composed of carbon fibers and a matrix material are considered three-dimensionally. Then, a hexagonal prism-shaped unit cell fully modeled with fibers and a matrix including interlaminar areas is defined. For this quasi-isotropic laminate, a homogenization theory for nonlinear time-dependent composites with point-symmetric internal structures is applied, enabling us to analyze both the macroscopic and microscopic elastic-viscoplastic behaviors of the laminate. The substructure method is introduced into the theory to reduce computational costs. The present method is then applied to the elastic-viscoplastic analysis of a quasi-isotropic carbon fiber/epoxy laminate subjected to an in-plane uniaxial tensile load, to investigate the macroscopic elastic-viscoplastic behavior of the laminate and the microscopic stress and strain distributions in them.

• Periodical: Key Engineering Materials (Volume 626)
• Pages: 512-517
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.626.512
• Online since: August 2014
• Authors: Keita Goto, Tetsuya Matsuda*, Naoto Kubota
• Keywords: CFRP, Homogenization, Interlaminar Stress, Quasi-Isotropic Laminate, Viscoplasticity

References

[1] T. Matsuda, D. Okumura, N. Ohno, M. Kawai, Three-dimensional microscopic interlaminar analysis of cross-ply laminates based on a homogenization theory, Int. J. Solids Struct. 44 (2007) 8274-8284.

DOI: 10.1016/j.ijsolstr.2007.06.010

[2] E. Sanchez-Palencia, Non-Homogeneous Media and Vibration Theory, Lecture Notes in Physics, No. 127, Springer-Verlag, Berlin, 1980.

[3] N. Ohno, X. Wu, T. Matsuda, Homogenized properties of elastic-viscoplastic composites with periodic internal structures, Int. J. Mech. Sci. 42 (2000) 1519-1536.

DOI: 10.1016/s0020-7403(99)00088-0

[4] N. Ohno, T. Matsuda, X. Wu, A homogenization theory for elastic-viscoplastic composites with point symmetry of internal distributions, Int. J. Solids Struct. 38 (2001) 2867-2878.

DOI: 10.1016/s0020-7683(00)00188-8

[5] O.C. Zienkiewicz, R.L. Taylor, The Finite Element Method, fifth ed., Butterworth-Heinemann, Oxford, 2000.

[6] T. Matsuda, N. Ohno, H. Tanaka, T. Shimizu, Homogenized in-plane elastic-viscoplastic behavior of long fiber-reinforced laminates, JSME Int. J. Ser. A 45 (2002) 538-544.

DOI: 10.1299/jsmea.45.538

[7] T. Matsuda, N. Ohno, H. Tanaka, T. Shimizu, Effects of fiber distribution on elastic-viscoplastic behavior of long fiber-reinforced laminates, Int. J. Mech. Sci. 45 (2003) 1583-1598.

DOI: 10.1016/j.ijmecsci.2003.09.021