About the influence of temperature and matrix ductility on the behavior of carbon woven-ply PPS or epoxy laminates: Notched and unnotched laminates

Abstract

Could thermoplastic-based composites be used to replace thermosetting-based composites in high-temperature secondary aircraft structures ? The purpose of this work is to establish the ability of a material system to be used in aircraft engine nacelles when subjected to static loadings, with a key upper temperature of 120°C. In order to provide answers to this question, the thermo-mechanical behaviors of carbon fiber fabric reinforced PPS or epoxy laminates have been compared specifically within the temperature change with 120°C at the upper bound. The temperature-dependent ductile behavior of laminates is more or less exacerbated, depending on polymers' glass transition temperature, and laminates' stacking sequence. For both materials, the degree of retention of tensile mechanical properties is quite high in notched and unnotched quasi-isotropic laminates. A Digital Image Correlation technique has been used in order to understand the influence of temperature and matrix ductility on the mechanisms of overstresses accommodation near the hole. In fabric reinforced laminates, the hightemperature results suggest a competition between the mechanisms of damage, and the mechanism of plasticization, enhanced in angle-ply lay-ups. Thus, the highly ductile behavior of TP-based laminates, at temperatures higher than their T g , is very effective to accommodate the overstresses near the hole.

Prediction of the notched strength of woven-ply PolyPhenylene Sulfide thermoplastic composites at a constant high temperature by a physically-based model

“…PolyEtherEtherKetone -PEEK) than in carbon/epoxy laminates. This ability is associated with less degree of stress relieving damage formation around the notch in unidirectional (UD) composites [18]. The effects of matrix ductility and toughness on notched /unnotched laminates have also been studied in carbon fibers woven-ply composites [17][18][19][20].…”

Temperature Effects on Mechanical Properties of Woven Thermoplastic Composites for Secondary Aircraft Structure Applications

“…matecconf/201 8 the fiber reinforced polymers, the majority of tensile load are carried by 0 o fibers, which results in a temperatureindependent behavior [12].…”

“…They observed that the inital damage generated from the edge of the hole, leading to a redistribution of stress. Even at elevated temperatures, two simultaneous mechanisms of damage and plastic deformation will result in a more complex failure behavior [12].…”

Finite Element Analysis of 2.5D Woven Composites, Part II: Damage Behavior Simulation and Strength Prediction

“…Some experimental researches and numerical simulations have been conducted to study on the mechanical property of material [4][5][6]. The test results show that the stress-strain curve has an obvious nonlinear and the fracture surfaces exist amount of fiber breaking and delaminated damage modes in the warps.…”