Thermo-mechanical behavior of stretch-broken carbon fiber and thermoplastic resin composites during manufacturing

Abstract

Stretch-broken fiber reinforcements and thermoplastic resin commingled prepregs are interesting for manufacturing composite parts in aeronautic and automobile industries. With these materials it is possible to produce composite parts with complex geometries, and high curvatures. On the other hand the length of the fibers leads to mechanical properties of the final composite that are close to those of the composite with continuous fibers. This paper analyzes the thermo-mechanical properties of Stretch Broken Carbon Fiber (SBCF) / PPS and PEEK commingled prepregs during manufacturing. Tensile and in-plane shear tests at different temperatures are analyzed. The experiments are realized in an isothermal oven. The range of temperature is those of the part during a thermoforming process. The experimental data allow to analyze the differences on the tensile and in-plane shear behaviors at different temperatures between thermoplastic prepregs with continuous fibers and thermoplastic prepregs with stretch-broken fibers. Forming simulations show that wrinkling can be avoided with SBCF prepregs while these wrinkles develop during continuous fibers prepreg forming. POLYM. COMPOS., 36:694-703, 2015.

Thermomechanical analysis, modelling and simulation of the forming of pre-impregnated thermoplastics composites

“…The main reasons for this assumption are the following: the tensile behaviour is mainly related to fibre tensions that are not viscous [40]; concerning bending stiffness, they are few data and it is often neglected or estimated in thermoplastic forming simulation [41]; bending rigidity is probably viscous yet there are few results on viscous bending properties of thermoplastic prepregs [42]. But some recent works [43] have shown that the bending stiffness influences the shape of the wrinkles in a forming simulation but that it is few sensitive.…”

Thermo-Mechanical Characterisations of Flax Fibre and Thermoplastic Resin Composites during Manufacturing

“…This indicated that the temperature and related change in shear behaviour have strong consequences on the final composite parts. Similarly, Stretch Broken Carbon Fibre/PPS and PEEK commingled prepregs are also explored at temperatures to obtain different thermo-mechanical behaviour [13]. Compared to flax fibre, the Polyamide (PA12) twining around the fibre yarn to present the mixed properties of Flax and PA12 is usually capable of serving as reinforcements [14].…”

“…Notably, the shear angle and its relationship to other conditions, such as force and deformation, is responsible for producing a simulated, reproducible curved form. This will allow us to accurately determine how the textile material performs under a range of temperature conditions, as the temperature is not generally constant during the thermoforming stage [3,12,13].…”

Composite helical spring with skin‐core structure: Structural design and compression property evaluation

“…[7][8][9] By utilizing the alignment of fibers in polymer matrix, the reinforcement in specific direction can be achieved. [10][11][12] Manjunatha et al revealed the possibility of replacing the traditional steel helical spring with fiber reinforcement helical spring. [13] Kara et al studied the mechanical properties of carbon fiber/carbon nanotube composite helical spring, and showed that the carbon fiber/carbon nanotube composite spring has better deformation and shear properties than steel spring.…”