Comparative Assessment of Elastio-Viscoplastic Models for Thermal Stress Analysis of Automotive Powertrain Component

2015-01-0533

04/14/2015

Event
SAE 2015 World Congress & Exhibition
Authors Abstract
Content
In this paper, thermal stress analysis for powertrain component is carried out using two in-house developed elasto-viscoplastic models (i.e. Chaboche model and Sehitoglu model) that are implemented into ABAQUS via its user subroutine UMAT. The model parameters are obtained from isothermal cyclic tests performed on standard samples under various combinations of strain rates and temperatures. Models' validity is verified by comparing to independent non-isothermal tests conducted on similar samples. Both models are applied to the numerical analysis of exhaust manifold subject to temperature cycling as a result of vehicle operation. Due to complexity, only four thermal cycles of heating-up and cooling-down are simulated. Results using the two material models are compared in terms of accuracy and computational efficiency. It is found that the implemented Chaboche model is generally more computationally efficient than Sehitoglu model, though they are almost identical in regard to accuracy. This study provides an insight into the necessary information required for fatigue and durability modeling of automotive engine components operating at elevated temperature.
Meta TagsDetails
DOI
https://doi.org/10.4271/2015-01-0533
Pages
10
Citation
Mao, J., Engler-Pinto, C., and Su, X., "Comparative Assessment of Elastio-Viscoplastic Models for Thermal Stress Analysis of Automotive Powertrain Component," SAE Technical Paper 2015-01-0533, 2015, https://doi.org/10.4271/2015-01-0533.
Additional Details
Publisher
Published
Apr 14, 2015
Product Code
2015-01-0533
Content Type
Technical Paper
Language
English