Computer models predicts residual stresses in composites

摘要

Producing dimensionally accurate composite components can be difficult because of residual stresses set up during processing. Thermal expansion, chemical shrinkage and non-uniform curing are among factors that build in stresses, which may later warp a product or degrade its performance. Solving this has traditionally involved trial and error with multiple samples, but the University of Illinois has now developed a computer model which helps predict residual stresses.The model offers promise that fabricators will be able to carry out their 'trial and error' on computer rather than through expensive and time consuming sample trials. The many variables involved in producing components to net shape can be manipulated individually or in combination. By simulating the mechanical effects of process variables, engineers can predict final dimensions of process variables, engineers can predict final dimensions of components and the residual stresses within them. They will be able to tame the tendency of parts to change shape and 'spring forward' when removed from molds.