Formability of the Steel Sheet at the Intermediate Strain Rate

Huh, Hoon; Lim, Ji Ho; Kim, Seok Bong; Han, S.; Park, Sung Ho

doi:10.4028/www.scientific.net/kem.274-276.403

Cited by 16 publications

(12 citation statements)

References 4 publications

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“…The longest elongation rate in this research is consistent with the increased tensile strength, at 4.5 mm/s. An inconstant strain caused this result during the process and the influence of vibration [17,24]. In conclusion, crosshead speed has some effects on tensile strength.…”

Section: The Description Of Tensile Test Resultsmentioning

confidence: 85%

“…The figure 1 shows that there is a decrease in the tensile strength after speed variations treatment. It also indicates that cross speed variation affects tensile strength and shock deformation that in turn affecting the material structure [17]. The tensile strength also declined with changes of control in the displacement.…”

Section: The Description Of Tensile Test Resultsmentioning

confidence: 94%

“…The result showed that speed rate variations generated a decrease in tensile strength. A high-speed rate tensile strength on an autobody steel sheet with the intermediate tensile test [17]. The result indicated that steel strain sensitivity rate in low speed was higher than that at high speed.…”

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confidence: 95%

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Crosshead Speed Effects on Ferro Casting Ductile (Fcd) Tensile Strength and Fault Morphology

Andoko¹

2019

MM SJ

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Nodular cast iron or Ferro casting ductile (FCD) is the developmental result of grey cast iron. Nodular cast iron has mechanical properties similar to carbon steel, which are better than the mechanical properties of grey cast iron. The 1.5 mm/s crosshead speed created a tensile strength of 549.8 N/mm 2 . It gradually declined to 401.4 N/mm 2 at 4.5 mm/s and 302.6N/mm 2 at 9 mm/s. Differentiation in strain rates at the speed variations caused the decline in tensile strength, creating energy lost due to the plastic deformation that resulted in the quick break in the specimen. The increase in strain rates influenced the yield strength results. These occurrences meant that the slower pullout generated a more static material. Thus, there was no declination in the tensile strength. Observed from the fault morphology results, a variant with 1.5 mm/s speed had ductile fractures, 4.5 mm/s speed variant had a combination of ductile-brittle fractures and 9 mm/s speed variant had brittle fractures.

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Section: The Description Of Tensile Test Resultsmentioning

confidence: 85%

Section: The Description Of Tensile Test Resultsmentioning

confidence: 94%

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Crosshead Speed Effects on Ferro Casting Ductile (Fcd) Tensile Strength and Fault Morphology

Andoko¹

2019

MM SJ

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“…Thermo-elastic-plastic properties are used and a temperature-dependent stress–strain relation is acquired from the Johnson–Cook model at various temperatures. 10–12 The temperature and stress distributions are compared with the measured results and good correlations are achieved. With these simulation methods, together with measurements, residual stress tensors in the product can be verified, and hence coupling effects of multi-step manufacturing are studied.…”

Section: Introductionmentioning

confidence: 98%

Analysis of coupled residual stresses in stamping and welding processes by finite element methods

Kang

Cheon

2012

Proceedings of the Institution of Mechanical Engineers, Part B:

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Residual stress distribution in an automotive component produced by forming and welding processes has been predicted by finite element methods. Multi-step process simulations have been synthesized to predict the coupled residual stresses. For the qualitative verification of the distribution, a neutron diffraction detection technique is adopted for residual stress measurement. Stamping simulation is carried out first and the results are mapped onto the mesh for welding simulation. Springback simulation is also performed to estimate the stamping residual stress distribution. Although the welding phenomenon is complex in the construction of a model, a simple simulation model is proposed with several assumptions and verified with experimental results. Temperature-dependent material properties are used for the welding simulation. Stress–strain relations on various temperatures are obtained from the Johnson–Cook model of SAPH380. Each process simulation result is compared with a measured one and a good correlation is achieved. The high residual stresses in the wall area of the sample can be successfully predicted with the sequential stamping and welding simulation. From simulation results, large weld residual stresses are obtained when the stamping effects are included, but not as large as the linear summation of weld and stamping residual stresses. The stamping or welding simulation alone cannot predict the large wall stress generation on the final product, but the sequential non-linear simulation successfully predicts the high stresses at the wall region.

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“…3. Dynamic uni-axial tension tests (Huh et al, 2004) were performed with four constant cross-head speeds: 0.032, 0.32, 3.2 and 6.4 m/s. These cross-head speeds give the true strain-rates 0.9, 9.0, 90.0 and 180.0 s À1 , respectively.…”

Section: Dp590 Base Sheetmentioning

confidence: 99%

Characterization of mechanical properties by indentation tests and FE analysis – validation by application to a weld zone of DP590 steel

Chung

Lee

Kim

et al. 2009

International Journal of Solids and Structures

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a b s t r a c tIn this work, the mechanical properties of the metal active gas (MAG) weld zone and heat affected zone (HAZ) were characterized utilizing the continuous indentation method together with its finite element (FEM) analysis. To verify the measured properties, uni-axial tension and three point bending tests were performed for DP590 welded specimens. For numerical simulations, the isotropic hardening law was assumed along with the non-quadratic anisotropic yield function, Yld2000-2d. As for the failure criterion of the base material and weld zones particularly for the failure evaluation in the uni-axial tension test, Hill's bifurcation theory and the M-K theory were applied to calculate the forming limit diagrams considering all measured properties including strain-rate sensitivity.

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Formability of the Steel Sheet at the Intermediate Strain Rate

Cited by 16 publications

References 4 publications

Crosshead Speed Effects on Ferro Casting Ductile (Fcd) Tensile Strength and Fault Morphology

Crosshead Speed Effects on Ferro Casting Ductile (Fcd) Tensile Strength and Fault Morphology

Analysis of coupled residual stresses in stamping and welding processes by finite element methods

Characterization of mechanical properties by indentation tests and FE analysis – validation by application to a weld zone of DP590 steel

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