Mechanical behavior and texture prediction of Ti-6Al-4V based on elastic viscoplastic self-consistent modelling

J. Galan-Lopez, S. Naghdy, P. Verleysen, L. A.I. Kestens, F. Coghe, L. Rabet, J. Degrieck

Résultats de recherche: Contribution à un journalArticle de conférenceRevue par des pairs

Résumé

The goal of this study is to apply an elastic viscoplastic self-consistent crystal plasticity model to predict the texture evolution in a Ti-6Al-4V alloy which has a (mainly) hexagonal crystal structure. The model under consideration is an extension of the viscoplastic self-consistent model proposed by Lebensohn and Tome [1993] which has been adapted to account for elasticity and has been integrated with a new algorithm, making it more computationally efficient within an implicit FE scheme. The flow behavior of Ti-6Al-4V is strongly dependent on strain rate and temperature. To estimate the model parameters, the flow behavior of quasi-static experiments is used. A temperature sensitivity term has been introduced to correct the effects of temperature increase during the dynamic experiments. In order to have a meaningful rate sensitivity exponent, a value is calculated based on valid experimental data, rather than choosing an arbitrary large numerical value. In this way the behavior of Ti-6Al-4V is captured at different strain rates. Predictions of the model are compared to experimental data.

langue originaleAnglais
Numéro d'article012027
journalIOP Conference Series: Materials Science and Engineering
Volume82
Numéro de publication1
Les DOIs
étatPublié - 24 avr. 2015
Evénement17th International Conference on Textures of Materials, ICOTOM 2014 - Dresden, Allemagne
Durée: 24 août 201429 août 2014

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