Micromechanics-based analysis of fiber-reinforced laminated composites

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7236240

Rahman, S

A procedure for three-dimensional nonlinear material modelling of fiber-reinforced laminated composites is presented. The material modelling procedure has a two-level hierarchical structure. At the bottom level, constitutive information about the fiber an d the matrix phases are synthesized using a micromechanical model to yield the effective stress-strain response of a unidirectional lamina. At the top level, a three-dimensional lamination scheme is employed which assembles the laminae within a sublaminate, and delivers the effective stress-strain response of the sublaminate. Local stresses and strains in a lamina or in fiber and matrix phases can be recovered from the effective values at any stage. The material modelling procedure enables the use of standard displacement-based finite elements. The matrix material is characterized using nonlinear-elastic Ramberg-Osgood relations. Micromechanical failure criteria are used for determining various modes of failure, including compression kinkbanding. The accuracy of the micromechanical model is demonstrated by comparing its predictions with results form other micromechanical models and experimental data. Examples are also presented for laminated structures; the results are in good agreement with analytical and experimental results available in the literature.

• Research Organization: Illinois Univ., Urbana, IL (United States)
• OSTI ID: 7236240
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
COMPOSITE MATERIALS
MATERIALS
MICROSTRUCTURE
REINFORCED MATERIALS
STRESS ANALYSIS