| About this Abstract |
| Meeting |
13th International Conference on the Technology of Plasticity (ICTP 2020)
|
| Symposium
|
13th International Conference on the Technology of Plasticity (ICTP 2020)
|
| Presentation Title |
A Novel Continuum Damage Constitutive Model for Predicting the Forming Limit of AA7075 Alloy at Elevated Temperatures |
| Author(s) |
Hai Rong, Liang Ying, Ping Hu, Wenbin Hou |
| On-Site Speaker (Planned) |
Hai Rong |
| Abstract Scope |
Hot forming has been proposed to improve the formability of high strength aluminum alloys. The main object of this paper is to formulate a continuum damage model to describe the damage evolution features of AA7075 alloy at elevated temperatures. Hot uniaxial tensile tests and hot Nakajima tests for AA7075 were conducted. Subsequently, a novel continuum damage model was proposed and incorporated into a set of unified visco-plastic constitutive equations to describe the thermal flow behaviors and predict the thermal forming limit diagram (TFLD) of AA7075. Material constants were determined based on experimental data with genetic algorithm. Moreover, the TFLD of AA7075 was numerically simulated by implementing the multi-axial constitutive equations via the user material subroutine VUMAT in commercial software ABAQUS. Good agreement between simulation and experimental results indicates the proposed damage model can be used to accurately predict the forming limit of AA7075 at elevated temperatures. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |