Prediction of springback in the forming of advanced high strength steel: simulation and experimental study

Dual Phase (DP) steel is categorized as advanced high-strength steels (AHSS) which has tensile strengths ranging from 500 to 800 MPa. DP steel is gaining popularity in automotive applications. It has higher formability than HSLA grades with similar initial yield strengths, but has much higher fin...

Full description

Saved in:
Bibliographic Details
Main Author: Mohamad Noor, Noraishah
Format: Thesis
Language:English
English
Published: 2011
Subjects:
Online Access:http://eprints.uthm.edu.my/2764/1/24p%20NORAISHAH%20MOHAMAD%20NOOR.pdf
http://eprints.uthm.edu.my/2764/2/NORAISHAH%20MOHAMAD%20NOOR%20WATERMARK.pdf
Tags: Add Tag
No Tags, Be the first to tag this record!
id my-uthm-ep.2764
record_format uketd_dc
spelling my-uthm-ep.27642021-11-01T07:02:19Z Prediction of springback in the forming of advanced high strength steel: simulation and experimental study 2011-05 Mohamad Noor, Noraishah TA Engineering (General). Civil engineering (General) TA401-492 Materials of engineering and construction. Mechanics of materials Dual Phase (DP) steel is categorized as advanced high-strength steels (AHSS) which has tensile strengths ranging from 500 to 800 MPa. DP steel is gaining popularity in automotive applications. It has higher formability than HSLA grades with similar initial yield strengths, but has much higher final part strength. With proper design strategy, Dual Phase (DP) steels offers a great advantage in terms of body weight reduction and crash performance. One of the major constraints in forming AHSS is the occurrence of high springback caused by elastic relaxation after loading, which causes ill-fitting in part assembly and geometric deviation of the intended design. This research focused on finite element (FE) simulation of the sheet forming of dual phase steel and the springback prediction. If springback could be accurately predicted, the forming die could be correctly designed to compensate springback. The material used in this study was DOCOL 800 DP manufactured by SSAB- Sweden with ultimate tensile strength of 870 MPa and thickness of 0.72mm. The plastic behavior of DP800 was presented by exponential based constitutive equation known as isotropic hardening. From tensile test, strain hardening value (n) was 0.308 and strength coefficient (K) was 1319.165 MP. The FE simulations were conducted for tensile test, U-channel forming and springback simulation. These simulations were carried out by using general purpose transient dynamic FE code Lsdyna. The tensile test simulation result indicated the isotropic hardening material model was suitable for DP800 behavior with standard deviation value 62.45 MPa between simulation and experiment. Meanwhile, the springback simulation using U-channel represented the deviation for BHF 10kN, 20kN, 30kN and 97kN were 0.019, 0.071, 0.341 and 0.231. Overall, the result of 20KN BHF applied indicated the minimum springback in the forming of DP800. 2011-05 Thesis http://eprints.uthm.edu.my/2764/ http://eprints.uthm.edu.my/2764/1/24p%20NORAISHAH%20MOHAMAD%20NOOR.pdf text en public http://eprints.uthm.edu.my/2764/2/NORAISHAH%20MOHAMAD%20NOOR%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan
institution Universiti Tun Hussein Onn Malaysia
collection UTHM Institutional Repository
language English
English
topic TA Engineering (General)
Civil engineering (General)
TA Engineering (General)
Civil engineering (General)
spellingShingle TA Engineering (General)
Civil engineering (General)
TA Engineering (General)
Civil engineering (General)
Mohamad Noor, Noraishah
Prediction of springback in the forming of advanced high strength steel: simulation and experimental study
description Dual Phase (DP) steel is categorized as advanced high-strength steels (AHSS) which has tensile strengths ranging from 500 to 800 MPa. DP steel is gaining popularity in automotive applications. It has higher formability than HSLA grades with similar initial yield strengths, but has much higher final part strength. With proper design strategy, Dual Phase (DP) steels offers a great advantage in terms of body weight reduction and crash performance. One of the major constraints in forming AHSS is the occurrence of high springback caused by elastic relaxation after loading, which causes ill-fitting in part assembly and geometric deviation of the intended design. This research focused on finite element (FE) simulation of the sheet forming of dual phase steel and the springback prediction. If springback could be accurately predicted, the forming die could be correctly designed to compensate springback. The material used in this study was DOCOL 800 DP manufactured by SSAB- Sweden with ultimate tensile strength of 870 MPa and thickness of 0.72mm. The plastic behavior of DP800 was presented by exponential based constitutive equation known as isotropic hardening. From tensile test, strain hardening value (n) was 0.308 and strength coefficient (K) was 1319.165 MP. The FE simulations were conducted for tensile test, U-channel forming and springback simulation. These simulations were carried out by using general purpose transient dynamic FE code Lsdyna. The tensile test simulation result indicated the isotropic hardening material model was suitable for DP800 behavior with standard deviation value 62.45 MPa between simulation and experiment. Meanwhile, the springback simulation using U-channel represented the deviation for BHF 10kN, 20kN, 30kN and 97kN were 0.019, 0.071, 0.341 and 0.231. Overall, the result of 20KN BHF applied indicated the minimum springback in the forming of DP800.
format Thesis
qualification_name Master of Philosophy (M.Phil.)
qualification_level Master's degree
author Mohamad Noor, Noraishah
author_facet Mohamad Noor, Noraishah
author_sort Mohamad Noor, Noraishah
title Prediction of springback in the forming of advanced high strength steel: simulation and experimental study
title_short Prediction of springback in the forming of advanced high strength steel: simulation and experimental study
title_full Prediction of springback in the forming of advanced high strength steel: simulation and experimental study
title_fullStr Prediction of springback in the forming of advanced high strength steel: simulation and experimental study
title_full_unstemmed Prediction of springback in the forming of advanced high strength steel: simulation and experimental study
title_sort prediction of springback in the forming of advanced high strength steel: simulation and experimental study
granting_institution Universiti Tun Hussein Malaysia
granting_department Fakulti Kejuruteraan Mekanikal dan Pembuatan
publishDate 2011
url http://eprints.uthm.edu.my/2764/1/24p%20NORAISHAH%20MOHAMAD%20NOOR.pdf
http://eprints.uthm.edu.my/2764/2/NORAISHAH%20MOHAMAD%20NOOR%20WATERMARK.pdf
_version_ 1747830984408039424