High Strain Rate Deformation of High Strength Sheet Steels for Automotive Parts

Miura, Kazuya; Takagi, Shusaku; Hira, T.; Furukimi, Osamu; Tanimura, Shinji

doi:10.4271/980952

Cited by 33 publications

(28 citation statements)

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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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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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“…14(a) represents the specific energy absorption E spec of the TWIP steel in comparison with selected conventional deep drawing steels, such as IF-steels (FeP04), bake hardening steels (Z St E 180 BH) and thermomechanically processed steels (Q St E 500 TM), respectively ( Table 2). 19,20) It is shown in the diagram that the specific energy absorption value of the TWIP steel is about 0.5 J/mm 3 and the conventional deep drawing steel qualities possess energy absorption values between 0.16ՅE spec Յ 0.25 J/mm 3 , which are half of that of the very crash resistant supra-ductile TWIP steel or even less. The high-energy absorption is achieved due to extensive twin formation under high strain rate condition, as illustrated in the TEM bright field micrograph of Fig.…”

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confidence: 99%

Supra-Ductile and High-Strength Manganese-TRIP/TWIP Steels for High Energy Absorption Purposes.

2003

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“…However, high- speed material testing techniques for small-sized specimens are not yet established owing to the delicacy inherent in the testing methods and the difficulty in specimen handling. In contrast, high-speed material testing techniques for various materials of common sizes, such as conventional auto-body steel sheets, different types of copper, aluminum alloys, and polymeric materials are well developed [4][5][6][21][22][23]. The present paper suggests a novel high-speed material microtesting technique at micro-scale and investigates the high strain-rate material properties of an OFHC copper film.…”

Section: Introductionmentioning

confidence: 96%

“…General mechanical or hydraulic machines, such as the Instron UTM, are used to obtain the stress-strain relationship at a low strain rate of less than 0.1/s. The material properties at intermediate strain rates ranging from 1/s to 1,000/s were obtained using high-speed material testing machines with a servo-hydraulic type actuator [4][5][6]. A split-Hopkinson pressure bar apparatus, also known as a Kolsky bar, is a popular type of experimental equipment used for the identification of dynamic material characteristics at high strain rates ranging from 10 3 /s to 10 4 /s [7].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Material Properties of an OFHC Copper Film at High Strain Rates Using a Micro-Testing Machine

Kim

Huh

2010

Exp Mech

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The material properties of an oxygen-free high thermal conductivity (OFHC) film with a thickness of 0.1 mm were evaluated at strain rates ranging from 10 −3 /s to 10 3 /s using a high-speed material micro-testing machine (HSMMTM). The high strain-rate material properties of thin films are important especially for an evaluation of the structural reliability of micro-formed parts and MEMS products. The high strain-rate material testing methods of thin films, however, have yet to be established to the point that the testing methods of larger specimens for electronics, auto-body, train, ship, and ocean structures are. For evaluation, a new type of HSMMTM was developed to conduct high-speed tensile tests of thin films. This machine is capable of testing at a sufficiently high tensile speed with an electromagnetic actuator, a novel gripping mechanism, and an accurate load measurement system. The OFHC copper film shows high strain-rate sensitivity in terms of the flow stress, fracture elongation, and strain hardening. These measures increase as the tensile strain rate increases. The rate-dependent material properties of an OFHC copper film are also compared with those of a bulk OFHC copper sheet with a thickness of 1 mm. The flow stress of an OFHC copper film is relatively low compared to that of a bulk OFHC copper sheet in the entire range of strain rates, while the fracture elongation of an OFHC copper film is much larger than that of a bulk OFHC copper sheet. A quantitative comparison would provide material data at high strain rates for the design and analysis of microappliances and different types of micro-equipment.

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High Strain Rate Deformation of High Strength Sheet Steels for Automotive Parts

Cited by 33 publications

References 0 publications

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

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

Supra-Ductile and High-Strength Manganese-TRIP/TWIP Steels for High Energy Absorption Purposes.

Evaluation of the Material Properties of an OFHC Copper Film at High Strain Rates Using a Micro-Testing Machine

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