Development of a Rolling Process Design Tool for Use in Improving Hot Roll Slab Recovery Quarterly Report: Q1 FY03

Couch, R ; Wang, P

Lawrence Livermore National Laboratory

关键词: Fractures;    Temperature Distribution;    Geometry;    Strain Rate;    42 Engineering;   

DOI  :  10.2172/15005024
RP-ID  :  UCRL-ID-139582-Q1-FY03
RP-ID  :  W-7405-ENG-48
RP-ID  :  15005024

美国|英语

来源: UNT Digital Library

【 摘 要 】

In this quarter, further analysis was done to investigate the difficulty in predicting fracture at the slab ends. The stress concentration created by the notch geometry at the slab ends can accelerate damage and promote fracture at the relatively low strain rates that exist when the notch region is not directly in the roll bite. However, the phenomenological fracture model provided by Alcoa Technical Center (ATC) was calibrated for strain rates characteristic of the rolling process zone and hydrostatic stress states less severe than the leading edge notch. Additional experiments are being performed at ATC to extend the model's range to include the low strain rate, high triaxiality condition. A bug in the parallel code that caused an inconsistent temperature distribution at the slab surface has been identified and Corrected. Currently, more simulations are being performed to validate the model.