Thermoplastic Composite Beam Research Articles

An Analytical Elastic-Plastic Stress Analysis for a Steel Fibre Reinforced Thermoplastic Composite Beam Subjected to Thermal Loading

This paper is concerned with a thermal elastic-plastic stress analysis on a steel fibre reinforced thermoplastic matrix composite beam fixed at its to ends. Temperature varying linearly is chosen at the upper and lower surfaces to be zero and T0, respectively. The solution is performed at 0, 60, 75 and 90° orientation angles. Plastic yielding does not occur at 30 and 45° orientation angles. It is found that the intensity of the residual stress component of σx and the equivalent plastic strain are maximum at the lower surface of the beam. The intensity of the residual stress is maximum at 0° orientation angle. The intensity of the equivalent plastic strain is found to be the greatest at 60° orientation angle.

An elastic–plastic stress analysis of thermoplastic composite beams loaded by bending moments

In this study, an elastic–plastic stress analysis is carried out on a high-density thermoplastic-based composite cantilever beam loaded by a bending moment at the free end. The composite beam is reinforced unidirectionally by steel fibers, at 0°, 30°, 45°, 60° and 90° orientation angles. An analytical solution is performed for satisfying both the governing differential equation in the plane stress case and boundary conditions for small plastic deformations. The solution is carried out under the assumption of the Bernoulli–Navier hypotheses. It is found that the intensity of the residual stress component of σ x is maximum at the upper and lower surfaces or at the boundary of the elastic and plastic regions. The composite material is assumed to be strain-hardening. The Tsai–Hill theory is used as a yield criterion. The displacement components are found in the elastic region.

Transient Analysis and Measurement of Anisotropic Heat Conduction in Transversely Isotropic Composite Materials

This study focuses on modeling the transient and steady state temperature distribution within a unidirectional fiber reinforced thermoplastic composite laminate beam after it has been inserted into a hot platen forming appartus. In the forming prodedure of interest, a room temperature sheet laminate is placed within hot platens that melt the matrix and allow the beam to be formed successfully. The heating process is dependent upon the convection conditions along the beam. The arrangement, volume fraction and individual conductivities of the matrix and fiber components of the beam determine its anisotropic thermal conductivity which, in turn, governs the heat flow. A two-dimensional steady state analytic series solution is developed for the beam/platen geometry and presented to model the heat conduction along the beam's length. In addition, two-dimensional numerical steady state and transient heat tranfer models are obtained using a finite element code. Finally, to validate these models, surface temperature measurements taken from a unidirectional laminate beam placed within the hot platens of the forming apparatus are compared to the analytic and numerical solutions.