Dynamic Deformation Behavior of Steel Sheet for Automobile

Miura, Kazuya; Takagi, Shusaku; Furukimi, Osamu; Obara, Takashi; Tanimura, Shinji

doi:10.4271/960019

Cited by 14 publications

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“…Plate tensile specimens with a gauge length of 3.8 mm and a thickness of 1.0 mm were prepared. A Hopkinson split pressure bar tester 6,7) was used to conduct the tensile test with a strain rate of 10 3 s Ϫ1 at 77 K (in liquid nitrogen), 210Ϯ1 K (in methanol) and 296 K (in air). Figures 2(a), 2(b) and 2(c) show nominal stress-nominal strain curves for the FP steels obtained from the tests using a strain rate of 10 3 s Ϫ1 , and Fig.…”

Section: Methodsmentioning

confidence: 99%

High-speed Deformation for an Ultrafine-grained Ferrite-Pearlite Steel.

2002

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Section: Methodsmentioning

confidence: 99%

High-speed Deformation for an Ultrafine-grained Ferrite-Pearlite Steel.

2002

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“…Gilat and Wu (1997) studied the response of a hot-rolled 1020 steel at the strain rates 5×10 -4 /sec, 2/sec and 1000/sec with various temperatures ranged from 25 o C to 600 o C. Liang (1999, 2000) studied the dynamic behaviors of three BCC metals of tantalum, tantalum alloy and AerMet 100 steel over a range of strain rates from 10 -6 /sec to 10 4 /sec and temperatures from 77 o F to 600 o F. Netmat-Nasser andGuo (2001, 2003) performed Hopkinson bar tests with AL-6XN stainless steel, DH-36 structural steel for ships and Nitronic-50 stainless steel over a wide range of temperatures from 77K to 1000K and they used to address the dynamic and the thermal softening behavior of these steels at high strain rate deformation. Lee and Liu (2006) conducted a compressive type Hopkinson bar test in order to compare the dynamic behavior of three steels with different levels of carbon content under strain rates ranging from 1.1×10 3 /sec to 5.5×10 3 /sec and temperatures ranging from 25 o C to 600 o C. Some studies on the dynamic behavior of the structural steel sheets for an auto-body at high strain rates above 1000/sec are conducted at room temperature (Shi and Meuleman, 1992;Miura et al, 1996;Mahadevan et al, 1998;. Although each investigation focused on a different aspect of testing methods or material responses, common characteristics observed were effects of strain rates and temperatures.…”

Section: Introductionmentioning

confidence: 99%

Dynamic hardening equation of the auto-body steel sheet with the variation of temperature

Huh

Lee

Song

2011

Int.J Automot. Technol.

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This paper is concerned with the empirical hardening equation of steel sheets for an auto-body at intermediate strain rates with the variation of temperature. In order to identify the temperature dependence of the strain-rate sensitivity of steel sheets such as SPRC35R, SPRC45E and TRIP60, uniaxial tensile tests have been performed with the variation of the strain rate from 0.001/sec to 200/sec and the environmental temperature from -40 o C to 200 o C. The thermo-mechanical response at the quasi-static state is obtained from static tensile tests and that at the intermediate strain rate is obtained from high speed tensile tests. The effects of both the strain rate and the temperature on the flow stress and the fracture elongation are investigated with the experimental data. Experimental results provide the variation of the strain-rate sensitivity with respect to the temperature. They also show that as the strain rate increases, the variation of flow stress becomes sensitive to the temperature. A phenomenological constitutive model is newly proposed by modifying the well-known Khan-Huang-Liang model. Based on the experimental data, both the strain rate and the temperature dependent sensitivity of the flow stress are considered in the proposed model by coupling the strain, the strain rate and the temperature. In order to verify the accuracy of the proposed model quantitatively, the standard error between the experimental data and the fitted one is compared with other empirical constitutive models such as the Johnson-Cook and the Khan-Huang-Liang models. The comparison demonstrates that the model proposed gives relatively accurate description of the experimental data at the various strain rates and temperatures.

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“…In the laboratory, high speed deformation performance of materials, such as dynamic strength and energy absorption, is usually examined by the Hopkinson bar testing machine 1,2) or the drop weight crush testing system. 3,4) In recent years, many studies have been conducted on the crashworthiness of various steels, [5][6][7][8][9][10] such as DP, transformation induced plasticity (TRIP), and high strength low alloy (HSLA) steels. However, most of them have only investigated the component design factors, such as size, shape and thickness.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure on Static and Dynamic Mechanical Property of a Dual Phase Steel Studied by Shear Punch Testing

Dabboussi

Hassani³

et al. 2005

ISIJ Int.

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The high-speed deformation behavior of a dual phase steel was studied by means of dynamic Hopkinson bar shear punch testing, with an emphasis on the influence of microstructure. Dual phase microstructures with different fractions of martensite were obtained by changing heat treatment parameters during intercritical annealing. The effects of low temperature tempering (170°C, 235°C, and 300°C) and bake hardening treatment (5 % pre-strain followed by holding at 170°C for 20 min) were also investigated for two selected microstructures containing 22 % and 61 % martensite, respectively. Quasi-static shear punch property was also measured by a MTS hydraulic machine and compared with dynamic results. Additionally, quasi-static tensile tests for some specimens were also conducted for validating the shear punch data.KEY WORDS: dual phase steel; shear punch test; Hopkinson bar. Table 1. Chemical composition of the tested steel in wt%.

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Dynamic Deformation Behavior of Steel Sheet for Automobile

Cited by 14 publications

References 0 publications

High-speed Deformation for an Ultrafine-grained Ferrite-Pearlite Steel.

High-speed Deformation for an Ultrafine-grained Ferrite-Pearlite Steel.

Dynamic hardening equation of the auto-body steel sheet with the variation of temperature

Effect of Microstructure on Static and Dynamic Mechanical Property of a Dual Phase Steel Studied by Shear Punch Testing

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