TRP 9904 - Constitutive Behavior of High Strength Multiphase Sheel Steel Under High Strain Rate Deformation

Matlock, David K.; Speer, John G.

doi:10.2172/841358

Cited by 5 publications

(22 citation statements)

References 9 publications

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“…The deformation mechanism has been shown to be dislocation driven and thermally activated. Similar results have been obtained in 4 with dynamic tests on an interstitial free steel in the strain rate range 0.001‐500s −1 in the base material and 2% up to 18% uniaxial tensile pre‐strained conditions. Little influence of uniaxial pre‐straining up to 10% on the strain rate sensitivity could be found also in 5 for dualphase DP600 and TRIP600 steels.…”

Section: Introductionsupporting

confidence: 86%

“…Little influence of uniaxial pre‐straining up to 10% on the strain rate sensitivity could be found also in 5 for dualphase DP600 and TRIP600 steels. Such results suggest that dislocations and dislocation substructures as a result of cold work are long‐range obstacles to dislocation motion, which cannot be thermally activated and therefore do not affect the strain rate sensitivity behaviour 4, 6.…”

Section: Introductionmentioning

confidence: 97%

“…The influence of a paint baking heat treatment (177 °C, 30 min) with 2% uniaxial pre‐straining on the strain rate sensitivity of yield strength has been investigated in 4 and 6 for a bake hardening and an interstitial free steel. The bake hardening steel shows a lower strain rate sensitivity for the yield strength especially in the low strain rate range below 10s −1 in the pre‐strained and bake hardened condition than in the base material condition.…”

Section: Introductionmentioning

confidence: 99%

“…The strain rate sensitivity decrease for the bake hardening steel can therefore only be attributed to the bake hardening effect. According to 4 and 6 the bake hardening stress component is more of athermal nature, involving long range dislocation interactions and new dislocation sources. The athermal regime of the bake hardening effect lowers the strain rate sensitivity of the bake hardened condition in the low strain rate in comparison to the base material condition.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Pre‐Straining and Bake Hardening on the Strain Rate Sensitivity of Automotive Sheet Steels

Larour

Dahmen

Bleck

2011

steel research int.

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The present investigation deals with the influence of pre-straining with or without bake hardening on the strain rate sensitivity of automotive sheet steels in typical crash conditions. The strain rate sensitivity m has been determined by means of dynamic tensile tests in the strain rate range 0.005-1000 s À1 and in the temperature range 233-373K. A bake hardening heat treatment at 170 8C for 20 min without pre-straining does not influence the m-value in comparison to the base material condition. A small pre-straining near plane strain condition, as commonly found in outer door panels, or a 10% uniaxial, plane strain and biaxial pre-straining, as typically used in formed automotive crash components, without bake hardening does not affect the m-value of sheet steels in comparison to the base material condition. Uniaxial 2% to 10% pre-straining, longitudinal or transverse to rolling direction with subsequent bake hardening, does not clearly change the m-value in comparison to the base material condition either. Small differences in the strain rate sensitivity behaviour are rather attributed to experimental scattering without real physical background.

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Section: Introductionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Pre‐Straining and Bake Hardening on the Strain Rate Sensitivity of Automotive Sheet Steels

Larour

Dahmen

Bleck

2011

steel research int.

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“…The geometry used by Jensen et al (1998) and the material chosen from the report by Matlock and Speer (2005), are used for modeling the process.…”

Section: Finite Element Modeling To Study Wearmentioning

confidence: 99%

Analysis of wear in deep-drawing process of a cylindrical cup

Shahani¹,

Salehinia²

2008

Journal of Materials Processing Technology

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Influence of Strain Rate, Temperature, Plastic Strain, and Microstructure on the Strain Rate Sensitivity of Automotive Sheet Steels

Larour

Bäumer

Dahmen

et al. 2012

steel research int.

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This work identifies the influence of strain rate, temperature, plastic strain, and microstructure on the strain rate sensitivity of automotive sheet steel grades in crash conditions. The strain rate sensitivity m has been determined by means of dynamic tensile tests in the strain rate range 10 À3 -200 s À1 and in the temperature range 233-373 K. The dynamic flow curves have been tested by means of servohydraulic tensile testing. The strain rate sensitivity decreases with increasing plastic strain due to a gradual exhausting of work hardening potential combined with adiabatic softening effects. The strain rate sensitivity is improved with decreasing temperature and increasing strain rate, according to the thermally activated deformation mechanism. The m-value is reduced with increasing strength level, this decrease being most pronounced for steels with a yield strength below 400 MPa. Solid solution alloying with manganese, silicon, and especially phosphorous elements lowers the strain rate sensitivity significantly. Second phase hardening with bainite and martensite as the second constituent in a ferritic matrix reduces the strain rate sensitivity of automotive sheet steels. A statistical modeling is proposed to correlate the m-value with the corresponding quasistatic tensile flow stress.

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TRP 9904 - Constitutive Behavior of High Strength Multiphase Sheel Steel Under High Strain Rate Deformation

Cited by 5 publications

References 9 publications

Influence of Pre‐Straining and Bake Hardening on the Strain Rate Sensitivity of Automotive Sheet Steels

Influence of Pre‐Straining and Bake Hardening on the Strain Rate Sensitivity of Automotive Sheet Steels

Analysis of wear in deep-drawing process of a cylindrical cup

Influence of Strain Rate, Temperature, Plastic Strain, and Microstructure on the Strain Rate Sensitivity of Automotive Sheet Steels

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