On certain aspects of strain rate sensitivity of sheet metals

Shi, Ming; Meuleman, D. J.

doi:10.1007/bf02649070

Cited by 13 publications

(5 citation statements)

References 17 publications

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“…Since the strain rate sensitivity m only results from the thermal activated stress component σ*, it is therefore not sensitive to any pre‐straining and/or bake hardening condition. Such results are in accordance with previous literature data suggesting the athermal nature of pre‐straining and bake hardening 2–6.…”

Section: Discussionsupporting

confidence: 93%

“…Such differences are more pronounced for lower strength HC180B in comparison to dualphase HCT500X and HCT600X steels. Such a decrease of the m‐value with increasing plastic strain during dynamic tensile testing has also been observed in 1, 2, 25 for sheet steels. The differences between the m‐value at yield and tensile strength also diminish with increasing Mises pre‐straining level.…”

Section: Discussionsupporting

confidence: 62%

“…Little influence of plane strain and biaxial 2 to 5% pre‐straining could be observed in 2 on the strain rate sensitivity of yield or tensile strength in the low strain rate range up to 2s −1 for various mild, high strength steels and high strength low alloy sheet steel grades. The strain rate sensitivity of the yield strength has been investigated in 3 for an interstitial free steel in the strain rate range 0.01‐2500 s −1 by means of dynamic compression tests, with a preliminary quasistatic compression pre‐straining in the same direction up to 20%.…”

Section: Introductionmentioning

confidence: 98%

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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: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

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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“… Schematic illustration of n values of various ferrous and non-ferrous metals; adapted from [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. …”

Section: Figurementioning

confidence: 99%

“…That is, studies regarding the influence of n of a material on the temperature increase during wire drawing are few [ 13 ], although several studies have been performed to investigate the effect of n on the strain distribution during wire drawing [ 14 , 15 ]. Figure 1 summarizes the n values of typical metals from the literature [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. The n values of metals, including wire rod products, vary significantly, from 0.1 to 0.6.…”

Section: Introductionmentioning

confidence: 99%

Influence of Strain Hardening Rate of Material on Temperature and Strain Distributions during Wire Drawing

Hwang

2023

Materials

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Temperature rise of a specimen is a significant issue in drawing industries for wire, rod, and bar products, because an excessive increase in temperature during the drawing process can deteriorate the product quality and die life. The influence of the strain hardening exponent (n) of a wire on the temperature and strain distributions during wire drawing is investigated to understand its effect and to improve the quality of drawn wire. Finite element analysis and experiments are conducted to analyze the temperature and strain distributions of wires with n values of 0.0, 0.1, 0.5, and 1.0. The temperature increase of the wire augments as the n of the wire increases, despite the same amount of ideal plastic deformation, which is associated closely with the redundant work. The shear strain increases with the n of the specimen, which generates redundant work, leading to a high temperature rise. Similarly, drawing force increases with the n of the specimen, owing to the increase in redundant work with the n of the wire. In addition, the drawing force presents a linear relationship with the temperature rise of the wire. The drawing speed should be reduced and/or the cooling of wire and die should be strengthened during wire drawing, with increasing n value of the wire, because product quality and die wear are highly associated with the temperature rise of the wire in the deformation zone.

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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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On certain aspects of strain rate sensitivity of sheet metals

Cited by 13 publications

References 17 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

Influence of Strain Hardening Rate of Material on Temperature and Strain Distributions during Wire Drawing

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

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