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Material, constitutive model of dual phase steel and springback simulation in the metal forming application

Samekto, Haryanti and Sani, Winardi and Sebayang, Darwin and Hasan, Sulaiman and Yusof, Mustafa (2011) Material, constitutive model of dual phase steel and springback simulation in the metal forming application. Project Report. Universiti Tun Hussein Onn Malaysia. (Unpublished)

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Abstract

Applications of dual phase (DP) steel are increasing due to its excellent features; those are high tensile test and good formability. DP steel offers high ratio between strength and weight which is crucial in the performance of light weight construction, as well as capability to be deformed into complex geometry. The major disadvantage of the application of DP steel in metal forming is the occurrence of springbaclc resulted by the elasticity recovery after load is released. The geomehcal discrepancy due to springback can cause problem in part assembly and geometric deviation of the design. If springback could be predicted, the tool and die could be accurately designed and built. Many simplified analytical model have been developed to predict springback, however these model managed to cover only simple geometries. For real part geometry, finite element (FE) method should be deployed. However, the accuracy of the springb ack prediction is influenced by material and process parameters included in the FE analysis. This study was focused on the investigating of the elastic-plastic behavior of DP steel following by the micro and macro modeling by using FEM. Uniaxial tensile testing was used to obtain stress and strain relationship and metallographic observation was conducted to identify phases and interaction between martensite particle and ferrite matrix during forming. Micro mechanical FE analysis depicted that under uniaxial stress ferrite grains elongated and martensite particles were inclined to accumulate. Grain boundaries were areas with the highest strain and failures could initiate in these areas. SEM micrograph confirmed the FE analysis results. FE simulation of uniaxial tensile testing indicated that exponential based plastic constitutive material equation represented the stress strain relationship better than linear based equation. FE simulation results for V-shape bending and U-channel shape deep drawing as well as experimental studies demonstrated the occurrence of significant springback by the forming of DP steel. By V-shape, the geometrical discrepancy was higher than by U-channel shape, because by U-channel shape the flow of material was controlled by the blank holder force. Good agreement between FE simulation and experimental results was achieved with the standard error below 1 0 %.

Item Type: Monograph (Project Report)
Subjects: T Technology > TS Manufactures > TS200-770 Metal manufactures. Metalworking
Depositing User: Normajihan Abd. Rahman
Date Deposited: 28 Sep 2011 05:24
Last Modified: 28 Sep 2011 05:24
URI: http://eprints.uthm.edu.my/id/eprint/1780
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