REVIEW OF ANALYTICAL MODELS OF ANISOTROPY-INDUCE SPRING FORWARD EFFECT VIA FEA SIMULATION AND AN EXPERIMENTAL STUDY

摘要

The increase of residual stresses during the phase change of thermoset fiber-reinforced composites causes unintended situations. A specific situation of interest is the angular distortion in curved fiber-reinforced thermoset parts, also referred to as the spring-forward effect or anisotropy induced curvature change. It has been identified that conventional analytical models deviate from experimental results when changing the part thickness. Therefore, it is of interest to study the effect of thickness variation on the final angle change. Some of these models neglect the effect of phase change in the distortion. This research relates the current scope of analytical and experimental models to predict spring-forward effect. It is necessary to extend the current models to involve the cure time-temperature-diagram (TTT) of thermoset resins.