Temperature Evolution in Carbon fiber / Bismaleimide Matrix Composites under Continuous-Wave Laser Irradiation

摘要

Comprehensive experimental and computational studies have been conducted toaccurately measure and predict temperature evolution in polymeric composite materialsubjected to laser irradiation. Plain-woven 16-ply composites with T650 carbon fibersand bismaleimide matrix were used as a substrate subjected to laser irradiation using acontinuous wave, ~1.0692 μm wavelength laser with a flat-top profile and a nominalbeam diameter of 3.0 cm. The spatial and temporal evolution of temperature for thefront (laser-exposed side) and back surfaces of the composite specimens weremonitored and recorded with spatially calibrated infrared (IR) cameras. Additionally,internal temperature evolution was measured with thermocouples embedded in themidplane of the composite specimens. A nonlinear transient finite element (FE)analysis, based on conductive, convective, and radiative heat transfer, was conductedusing a commercial FE software package, ANSYS, to predict the temperature historyduring heating (laser exposure) and cooling (after exposure). For all investigated laserpowers (5.0 - 13.8 W), the numerical prediction demonstrated considerable agreementwith experimental IR camera and thermocouple data.