Predictive forming of advanced thermoplastic composite structures. [Use of elastic/viscoplastic constitutive model]

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:7018078

Wang, Cong

The objective was to provide an analytical methodology to model the solid-phase forming of the advanced thermoplastic composite structures. This is achieved through the modeling of the material behavior of the APC-2 thermoplastic composite under forming conditions and the development of a numerical scheme to simulate the forming process. Material responses were observed during the entire forming process. An elastic/viscoplastic constitutive model is used to describe the inelastic and rate-dependent behavior of the advanced thermoplastic composites in the forming and relaxation stages. The strong anisotropy exhibited in the plastic flow is accounted for by a one-parameter plastic potential. Because of a rapid crystallization process in the thermoplastic resin, the thermal stresses developed during the cooling are not sensitive to the cooling rate and can be predicted by a thermo/elastic relationship. The increased mismatch in fiber and matrix properties at elevated temperatures may induce a significant dependence of the composite laminate properties on the change in fiber orientation during forming. A finite element code was developed to numerically simulate the solid-phase forming process.

• Research Organization: Purdue Univ., Lafayette, IN (United States)
• OSTI ID: 7018078
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360602* -- Other Materials-- Structure & Phase Studies
COMPOSITE MATERIALS
FABRICATION
FIBERS
FINITE ELEMENT METHOD
FUNCTIONAL MODELS
MATERIALS
MATERIALS WORKING
MOLDING
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORIENTATION
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
SIMULATION
STRESSES
SYNTHETIC MATERIALS
THERMAL STRESSES
THERMOPLASTICS