Shahrood University of Technology Journal of Solid and Fluid Mechanics 2251-9475 2 4 2013 09 03 Annealling Process for Polycarbonate Sheet to Remove the Residual Stresses Annealling Process for Polycarbonate Sheet to Remove the Residual Stresses 15 24 156 10.22044/jsfm.2013.156 FA Mahnaz Zakeri Journal Article 2012 06 24 In this paper, annealling processes for stress relaxation and removing residual stresses from polycarbonate sheet are studied and evaluated using experimental tests.Then, by making some alterations and modifications in the prevous heating cycles, thermal operations in the furnace on different samples are performed. By appraising the obtained results, a modified thermal process is presented which can remove the residual stress from the polycarbonate sample, while reducing the time and cost of the annealing process. According to this process, the temperature is raised to 100˚C at the heating rate of 20˚C/h. The samples are kept at this temperature for 3 hours and then, the heating is continued up to 140˚C at a slower rate of 5˚C/h. Then, the specimens are heated at the rate of 1˚C/h until maximum temperature of Tmax = 156˚C. After reaching this point, the samples are cooled immediately, and the cooling rates are same as the heating rates. In this paper, annealling processes for stress relaxation and removing residual stresses from polycarbonate sheet are studied and evaluated using experimental tests.Then, by making some alterations and modifications in the prevous heating cycles, thermal operations in the furnace on different samples are performed. By appraising the obtained results, a modified thermal process is presented which can remove the residual stress from the polycarbonate sample, while reducing the time and cost of the annealing process. According to this process, the temperature is raised to 100˚C at the heating rate of 20˚C/h. The samples are kept at this temperature for 3 hours and then, the heating is continued up to 140˚C at a slower rate of 5˚C/h. Then, the specimens are heated at the rate of 1˚C/h until maximum temperature of Tmax = 156˚C. After reaching this point, the samples are cooled immediately, and the cooling rates are same as the heating rates. https://jsfm.shahroodut.ac.ir/article_156_f764b750afa39d9a1256bb0ec583d751.pdf