Residual Thermal Stresses Simulation of Television Panel in the Forming Process. Part 2: Simulations and Validation

Abstract

To obtain the temperature history data of the part taken for residual stresses analysis, a numerical simulation has been developed for the part cooling during the TV panel forming process. In the simulation, a local one-dimensional transient analysis in the thickness direction is adopted, which employs the finite-difference method. The renormalization-group turbulence model is applied for jet impinging cooling. By applying the numerical analysis system described in Part I, the residual stresses in the formed TV panel part are predicted. Experimental comparison is employed to verify the proposed models and methods. The temperatures were measured by a thermographic camera and the residual stresses were measured using the birefringence. On the whole, the predictions are encouraging. The agreement between measured temperatures and simulation results is very good, with the maximum deviation within 5 per cent. The residual stresses trends of the experimental results indicated a similar behaviour over most of specimen thickness. Also, the results showed about the same magnitude of predicted stresses in specimen.