Material, constitutive model of dual phase steel and springback simulation in the metal forming application
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 com...
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| தலைமை எழà¯à®¤à¯à®¤à®¾à®³à®°à¯à®•à®³à¯: | , , , , |
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| வடிவமà¯: | Monograph |
| வெளியீடபà¯à®ªà®Ÿà¯à®Ÿà®¤à¯: |
Universiti Tun Hussein Onn Malaysia
2011
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| பகà¯à®¤à®¿à®•à®³à¯: | |
| நிகழà¯à®¨à®¿à®²à¯ˆ அணà¯à®•à®²à¯: | http://eprints.uthm.edu.my/1780/ http://eprints.uthm.edu.my/1780/1/0369x.pdf |
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| தொகà¯à®ªà¯à®ªà¯: | 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
%. |
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