A study on polymer modulus test using laser-based finite element method

The theoretical research and experiment by using laser-based FEM method to determine the complex dynamic elastic modulus of homogeneous polymer have been conducted.Errors analysis has been done according to the problem that the measurement precisions are different because of different choice of measurement points.The formula of sensitivity matrix has been deduced.The method for error bounds calculation has been obtained.The main factors which influence the measurement precisions have been find out via sensitivity analysis.A laser-based FEM inverse measurement system has been established.Measurement errors of Poisson's ratio have been significantly reduced after the optimization of measurement points.Measurement of time-temperature superposition(TTS) has been achieved by the inverse approach.The difference is within 10%in comparison with the measured date from the DMA,and this validates the accuracy of our system developed in this thesis.