An Elastic-Plastic Damage Model for Long-Fiber Thermoplastics
This article proposes an elastic-plastic damage model that combines micromechanical modeling with continuum damage mechanics to predict the stress-strain response of injection-molded long-fiber thermoplastics. The model accounts for distributions of orientation and length of elastic fibers embedded in a thermoplastic matrix whose behavior is elastic-plastic and damageable. The elastic-plastic damage behavior of the matrix is described by the modified Ramberg-Osgood relation and the three-dimensional damage model in deformation assuming isotropic hardening. Fiber/matrix debonding is accounted for using a parameter that governs the fiber/matrix interface compliance. A linear relationship between this parameter and the matrix damage variable is assumed. First, the elastic-plastic damage behavior of the reference aligned-fiber composite containing the same fiber volume fraction and length distribution as the actual composite is computed using an incremental Eshelby-Mori-Tanaka mean field approach. The incremental response of the latter is then obtained from the solution for the aligned-fiber composite by averaging over all fiber orientations. The model is validated against the experimental stress-strain results obtained for long-glass-fiber/polypropylene specimens.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 978526
- Report Number(s):
- PNNL-SA-62796; VT0505000; TRN: US201010%%6
- Journal Information:
- International Journal of Damage Mechanics, 19(6):691-725, Journal Name: International Journal of Damage Mechanics, 19(6):691-725
- Country of Publication:
- United States
- Language:
- English
Similar Records
Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics
An Elastic-Plastic and Strength Prediction Model for Injection-Molded Long-Fiber Thermoplastics
Related Subjects
THERMOPLASTICS
MATHEMATICAL MODELS
ELASTICITY
PLASTICITY
FIBERS
REINFORCED MATERIALS
DAMAGE
MATRIX MATERIALS
HARDENING
POLYPROPYLENE
Long-fiber thermoplastics
injection molding
fiber length distribution
fiber orientation
elastic-plastic
continuum damage
matrix cracking
fiber/matrix debonding
failure
strength.