Perpustakaan Digital ITB

The use of metallic material is widespread in the modern world. In it various forms, metals may exhibit various material behavior such as anisotropy and viscoplasticity. In design of engineering components, the ability to predict these behaviors is important to assess material performance. Afdhal et. al. (2022) has previously developed a constitutive model for assessing elasto-viscoplastic behavior of sheet metals with anisotropy in small strain framework. In this thesis, the constitutive model is slightly improved and implemented into finite element framework. This work aims to include temperature softening behavior and formulates the elasto-viscoplastic problem in finite strain. The implementation of elasto-viscoplastic using explicit return-mapping has been successful. To prove the usefulness of the developed model, it is used to simulate tensile test in various conditions and the results were compared with experiment. It shows good capability in predicting anisotropy, captures varying rates of viscoplasticity, and temperature softening at elevated temperatures.