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Fatigue and durability analyses are designed to determine how long a flexible body or specific area of a flexible body modeled in RecurDyn can stably endure various dynamic loads. Such analyses can also determine how stable a body is. The focus on time distinguishes these forms of analysis from other analysis methods, such as those used to determine maximum stress and maximum deformation rates.

RecurDyn, in consideration of the flexibility of the model, supports RFlex of FFlex bodies in multi-body dynamic models. Therefore, this tutorial teaches you how to use the RecurDyn/Durability module to analyze the durability of both the FFlex bodies and the RFlex bodies.

The model being used in this tutorial is a simplified 4-cylinder internal combustion engine. The crankshaft in this model has been replaced with an RFlex body, and the combustive explosion process occurring in the four cylinders push the pistons to provide a dynamic load. The durability analysis in this tutorial determines the stability and durability of the crankshaft design.