Final Master’s Project Joseph Hughes Finite Element Analysis of Fatigue on an Overtoggle Mechanism The purpose of this study is to analyze the stress in components that comprise an overtoggle mechanism throughout its motion. Overtoggle mechanisms are often used within four bar linkages to maintain the position of the mechanism. In order to achieve the overtoggle position, a large amount of force is placed into the mechanism as the components are either compressed or stretched to achieve overtoggle. This analysis will evaluate the stresses within the mechanism as it passes into and out of the overtoggle position. The amount of stress can be different if the mechanism is passing into of out of the overtoggle position. This evaluation will be completed using Abaqus to analysis the stress distribution within the mechanism. This analysis will also perform a sensitivity analysis to the amount of stretch or compression required (i.e a small change in the required compression from a different compliant material could cause a much higher stress in the system). This analysis can be compared to a friction circle hand calculation to verify the analysis.