Dynamic tensile mechanical properties and constitutive equation of Kevlar29 yarn

ZHOU Xuan; XU Lizhi; REN Wenke; GAO Guangfa

doi:10.11883/bzycj-2023-0119

Volume 44 Issue 1

Jan. 2024

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ZHOU Xuan, XU Lizhi, REN Wenke, GAO Guangfa. Dynamic tensile mechanical properties and constitutive equation of Kevlar29 yarn[J]. Explosion And Shock Waves, 2024, 44(1): 013101. doi: 10.11883/bzycj-2023-0119

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Dynamic tensile mechanical properties and constitutive equation of Kevlar29 yarn

doi: 10.11883/bzycj-2023-0119

ZHOU Xuan^1
,,
XU Lizhi^{1, 2, 3},
REN Wenke¹,
GAO Guangfa^{1
,
,}

1.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China
3.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China

Received Date: 2023-04-04
Rev Recd Date: 2023-09-26

Available Online: 2023-10-08

Publish Date: 2024-01-11

Abstract

Abstract

In order to clearly characterize the mechanical behavior of Kevlar29 yarn at different strain rates, this paper reports quasi-static and dynamic tensile tests on Kevlar29 yarn. Combined with the split Hopkinson tensile bar (SHTB) theory and motion target tracking method, the stress-strain curves of Kevlar29 yarn at different strain rates are accurately obtained, and then the deformation and fracture process of yarn dynamic tension are analyzed, revealing the strain rate effect of Kevlar29 yarn mechanical properties. Based on the strain rate effect of yarn, a viscoelastic constitutive equation is obtained through the least squares fitting method, and the differences and applicability between the three-element and five-element constitutive models are analyzed. The results show that when the strain is calculated by identifying the coordinates of the marker points on the yarn by the motion target tracking method, it is more accurate than the strain calculated directly from the waveform measured by SHTB. The quasi-static mechanical properties and dynamic mechanical properties of Kevlar29 yarn differ significantly, e.g., the dynamic tensile modulus and tensile strength are higher than those of quasi-static, and the dynamic fracture strain is smaller than that of quasi-static. In the strain rate range of 0.001–700 s⁻¹, with the increase of strain rate, the breaking strain of Kevlar29 yarn decreases, and the tensile strength, tensile modulus and toughness all increase first, but at higher strain rates, the tensile strength (higher than 497.5 s⁻¹) and toughness (higher than 330.7 s⁻¹) decrease, while the tensile modulus (higher than 330.7 s⁻¹) tends to be stable. The viscoelastic constitutive equation can better characterize the strain rate effect of the mechanical properties of Kevlar29 yarn, but the viscoelastic constitutive model cannot reflect the nonlinear stress-strain relationship of the yarn before fracture. Relatively speaking, the fitting effect of the five-element viscoelastic model is better than that of the three-element viscoelastic model.
- Kevlar fiber,
- tensile mechanical properties,
- viscoelastic constitutive model,
- strain rate effect

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References(19)

References

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