|Tipo di tesi||Tesi di laurea magistrale|
|Titolo||Modellazione FEM di supporti in gomma: taratura delle costanti del modello Mooney-Rivlin sulla base di dati sperimentali e messa a punto di elementi CBUSH equivalenti|
|Titolo in inglese||FEM models of rubber bushings: tuning of Mooney-Rivlin material's coefficients based on experimental data and setup of equivalent CBUSH elements|
|Struttura||Dipartimento di Ingegneria "Enzo Ferrari"|
|Corso di studi||Advanced Automotive Engineering (D.M.270/04)|
|Data inizio appello||2021-10-21|
|Disponibilità||Accessibile via web (tutti i file della tesi sono accessibili)|
La modellazione di supporti in gomma in ambito FEM può risultare complessa. Studi dedicati a questi elementi vengono spesso tralasciati, per mancanza di tempo o di informazioni riguardanti le proprietà da assegnare al materiale iperelastico.
Modeling rubber bushings in extensive FEM simulations might be a complex task. Specific studies of the bushings might be overlooked, either because of lacking time or missing information regarding the material properties. In fact, despite being the FEM software equipped with adequate tools to model rubber and analogous materials, scarce literature data is provided about the correct tuning of the related material properties. This project has two goals: on the one hand, material constants to tune the hyperelastic material model of a specific rubber are researched based on experimental data. On the other hand, methods are identified to substitute computationally expensive rubber bushing models in extensive FEM simulations of product subassemblies. The optimizer HyperStudy is utilized for the tuning process to find the material constants by enforcing the correspondence between the experimental data and the numerical simulations. Furthermore, analytical methods are employed to characterize rubbers with Shore hardness different from the experimentally tested ones. Analytical and numerical methods are determined to set up equivalent CBUSH elements to substitute bushings’ models in FEM simulations. As a result, optimized material constants are identified to simulate rubber bushings presenting a generic geometry and a Shore A hardness ranging from 30 to 70. Following the guide, it is possible to characterize their mechanical behavior and reduce them to simple unidimensional CBUSH elements. The obtained procedure is compared to experimental data and literature. A solid correlation with expected results is found, which validates the offered procedures. As a final result of the project, a guide is published (not provided in the the- sis), which allows replicating all the analysis steps and refining the computed material constants in case additional experimental data should be obtained.