Abstract
Today's automotive industry is witnessing increasing applications of advanced high strength steels (AHSS) combined with innovative manufacturing techniques to satisfy fuel economy requirements of stringent environmental regulations. The integration of AHSS in novel automotive structure design has introduced huge advantages in mass reduction while maintaining their structural performances, yet several concerns have been raised for this relatively new family of steels. One of those concerns is their potentially high springback after forming, which can lead to geometrical deviation of the final product from its designed geometry and cause difficulties during assembly. From the perspective of accurate prediction, control and compensation of springback, further understanding on the effect of residual stress in AHSS parts is urged. In this work, the residual stress distribution in a 980GEN3 steel part after hydroforming is investigated via experimental and numerical approaches. A non-destructive neutron diffraction technique is adopted to reveal the residual stress profiles across a 94-degree tube bending radius section of the hydroformed part. The finite element analysis (FEA) is also conducted to simulate the hydroforming and the subsequent unloading processes to predict the residual stress distribution within the same region. The correlation between experimental and simulation results is presented and the effectiveness of the FEA model for residual stress prediction is discussed. Findings in this study set the basis for springback analysis with improved accuracy and reliability.
| Original language | English |
|---|---|
| Journal | SAE Technical Papers |
| Volume | 2018-April |
| DOIs | |
| State | Published - 2018 |
| Event | 2018 SAE World Congress Experience, WCX 2018 - Detroit, United States Duration: Apr 10 2018 → Apr 12 2018 |
Funding
The authors are grateful to Mr. Justin Lutz at United States Steel Corporation for his help coordinating the forming processes of the tested component. The authors would like to thank United States Steel Corporation for the permission to publish the data in this paper. The neutron scattering experiment was carried out at the Spallation Neutron Source, (SNS), which is the U.S. Department of Energy (DOE) user facility at the Oak Ridge National Laboratory, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, DOE. D.Y. thanks the support of the ORNL-UTK SWC IAP program. The authors thank Mr. M.J. Frost from SNS for the technical support. The authors are grateful to Mr. Justin Lutz at United States Steel Corporation for his help coordinating the forming processes of the tested component. The authors would like to thank United States Steel Corporation for the permission to publish the data in this paper. The neutron scattering experiment was carried out at the Spallation Neutron Source, (SNS), which is the U.S. Department of Energy (DOE) user facility at the Oak Ridge National Laboratory, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, DOE. D.Y. thanks the support of the ORNL-UTK SWC IAP program. The authors thank Mr. M.J. Frost from SNS for the technical support. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).
| Funders | Funder number |
|---|---|
| Scientific User Facilities Division | |
| U.S. Department of Energy | |
| Basic Energy Sciences | |
| Oak Ridge National Laboratory |
