Strain-Rate Effect and Constitutive Models for Q550 High-Strength Structural Steel

Hua, Yang; Yang, Xiaoqiang; Varma, Amit H.; Zhu, Yong

doi:10.1007/s11665-019-04431-2

Cited by 35 publications

(12 citation statements)

References 30 publications

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“…There are two material parameters in CS equation, D and p, which artificially increase the yield strength under high strain-rate loading and, therefore, increase the required cutting energy. Considering that there is no material parameter available for silk film yet, the parameter p is preliminarily set to be 5, 7 and 10, based on the values for conventional materials [44][45][46]. The parameter D ranges from 0.1 to 6500.…”

Section: Determination Of Cowper-symonds Materials Parametersmentioning

confidence: 99%

Investigation of chip formation mechanism in ultra-precision diamond turning of silk fibroin film

Wang

Luo

Sun

et al. 2022

Journal of Manufacturing Processes

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Section: Determination Of Cowper-symonds Materials Parametersmentioning

confidence: 99%

Investigation of chip formation mechanism in ultra-precision diamond turning of silk fibroin film

Wang

Luo

Sun

et al. 2022

Journal of Manufacturing Processes

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“…Malvar [ 12 ] et al conducted experimental dynamic studies on the rebars with a yield strength of 290–710 MPa and proposed dynamic increase factor formulas for the rebar yield strength and ultimate tensile strength (UTS) based on the test results. Yang [ 13 ] et al conducted a quasi-static tensile test and a dynamic tensile test on Q550 rebars under different strain rates. They found that the yield strength of Q550 rebars increased with the strain rate, but the strain-rate sensitivity of Q550 rebars was lower than that of ordinary low-carbon steel rebars.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Tensile Behaviors of HRB500E Connected with Extrusion Sleeves at Different Strain Rates

Zhu

Su³

et al. 2023

Materials

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In this paper, the connection performance of extrusion sleeves and the strain rate effect on 500 MPa-grade hot-rolled ribbed bar(HRB500E) connected with extrusion sleeves under a range of testing strain rates from 1.079/sto1.395/s, similar to what would be caused by an impact, were explored. The test results showed that, under strain rates likely caused by aircraft impact, the specimens mostly failed due to breaking outside the joint length. Furthermore, there was no relative slip between the rebar and the extrusion sleeve, indicating that the connection was stable and reliable in the used experimental parameter field. The percentage total elongation at maximum force (Agt) of HRB500E spliced by the extrusion sleeve showed an exponential decline with the increase in the strain rate, indicating a clear strain-rate sensitivity. The average deviation between the dynamic increase factors (DIF) calculated using the modified Cowper–Symonds formulas and the experimental values was within 5.4%, which can better reflect the strain rate effect on the strength of the spliced connection. The DIFy of sleeve-spliced rebars was higher than that of unspliced rebars, and the ratio of the DIFy of sleeve-spliced rebars to the DIFy of unspliced rebars increased with the strain rate. The experimental results can provide a basis for an optimized design of the aircraft impact-resistant extrusion sleeve rebar connections.

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“…The strain rate-dependent behaviours of structural steel of different grades with the yield strength ranging from 321 to 906 MPa have been investigated [15][16][17][18][19][20][21][22][23]. The existing references show that structural steel is sensitive to strain rate and its yield stress is more sensitive to strain rate than the ultimate tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Tensile Behaviour of TMCP Q690d High-Strength Structural Steel at Strain Rates From 0.00025 to 760 S-1

2022

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The application of Q690D high-strength structural steel (HSSS) has been increasing in engineering structures. The lack of knowledge of the strain rate behaviour limits the application to the extreme loading conditions such as blast and impact loadings. This paper presents a series of tensile tests on the dynamic tensile behaviour of Q690D HSSS produced through the thermo-mechanical control process (TMCP). The stress-strain relationships of TMCP Q690D in the strain rate range of 0.00025 to 760 s-1 were measured by using the universal and servo-hydraulic high speed testing machines. The experimental results verified the sensitivity to strain rate of TMCP Q690D and the dynamic increase factor (DIF) for yield stress is identical to that of QT (Quenched and Tempered) S690 HSSS. However, TMCP Q690D behaves in a much different way in the strain hardening stage. The commonly-used Cowper-Symonds model was calibrated for the DIFs of yield stress and ultimate tensile strength. The Johnson-Cook (J-C) model was modified and a new rate-dependent constitutive model was proposed. The proposed model was validated successfully to predict the true stress-strain relationship, providing better prediction results than the modified J-C model.

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Strain-Rate Effect and Constitutive Models for Q550 High-Strength Structural Steel

Cited by 35 publications

References 30 publications

Investigation of chip formation mechanism in ultra-precision diamond turning of silk fibroin film

Investigation of chip formation mechanism in ultra-precision diamond turning of silk fibroin film

Dynamic Tensile Behaviors of HRB500E Connected with Extrusion Sleeves at Different Strain Rates

Tensile Behaviour of TMCP Q690d High-Strength Structural Steel at Strain Rates From 0.00025 to 760 S-1

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