Finite Element Modeling of Pulse Phase Thermography of an Approximate Model of Low Velocity Impact Induced Damage in Carbon Fiber Reinforced Polymer Structures

摘要

In this work, we apply the finite element (FE) method to simulate an approximate low velocity impact inducedmodel. One important characteristic of low velocity impact damage is the presence of multiple defects located atdifferent depths, creating overshadowing among each other, affecting the thermal diffusion and therefore the blindfrequency and temperature distribution on the surface, understanding this phenomenon is paramount in order toquantify the magnitude of under-the-surface damages. In this paper, we create a representative geometry of a defectusing the meshing code CUBIT and solve the finite element model in ARIA thermal code in order to simulate thephase component of reflected thermal waves. The phase and thermal data collected from the FE solution on thesurface above each defect is post processed and linearly correlated, in conjunction with a two-point strategy toprovide information about the defect below the surface of interest. We also present a comparison with a single defectrepresentation of the defect, proving that single model defect is not accurate to represent damage created by lowvelocity impact.