Fracture Analysis of Ultrahigh-Strength Steel Based on Split Hopkinson Pressure Bar Test

Xiao, Shihong; Luan, Xiaosheng; Liang, Zhiqiang; Wang, Xibin; Zhou, Tianfeng; Ding, Yue

doi:10.3390/met12040628

Open AccessArticle

Fracture Analysis of Ultrahigh-Strength Steel Based on Split Hopkinson Pressure Bar Test

by

Shihong Xiao

^1,2,

Xiaosheng Luan

¹,

Zhiqiang Liang

^1,*

,

Xibin Wang

¹,

Tianfeng Zhou

¹ and

Yue Ding

²

¹

School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

²

AVIC Manufacturing Technology Institute, Beijing 100024, China

^*

Author to whom correspondence should be addressed.

Metals 2022, 12(4), 628; https://doi.org/10.3390/met12040628

Submission received: 22 February 2022 / Revised: 30 March 2022 / Accepted: 30 March 2022 / Published: 6 April 2022

(This article belongs to the Special Issue Advances in High-Strength Low-Alloy Steels)

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Abstract

Impact loading is an important cause of fracture failure of ultrahigh-strength steel parts during service. Revealing the fracture mechanism of ultrahigh-strength steel under impact loading has important reference significance for the material preparation, part design, and manufacturing of such steel. Based on the split Hopkinson pressure bar (SHPB) test, the mechanical response characteristics of 45CrNiMoVA steel under impact loading were analyzed, and the true stress–true strain curves under a high strain rate (10³ s⁻¹) were obtained. It was found that under the simultaneous action of forward and tangential loading forces, a severe plastic deformation layer with a thickness of 20–30 μm was generated in the near impact-loading end face, which is the main cause for crack initiation and propagation. Under the condition of a high strain rate, the plastic flow stress of 45CrNiMoVA steel was characterized by the equilibrium of strain hardening and strain softening, and its impact fracture toughness decreased by 43.6%, resulting in increased quasi-cleavage fracture. Hence, severe surface plastic deformation during 45CrNiMoVA steel machining should be avoided, as it may lead to early failure.

Keywords: ultrahigh-strength steel; fracture; impact loading; SHPB

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MDPI and ACS Style

Xiao, S.; Luan, X.; Liang, Z.; Wang, X.; Zhou, T.; Ding, Y. Fracture Analysis of Ultrahigh-Strength Steel Based on Split Hopkinson Pressure Bar Test. Metals 2022, 12, 628. https://doi.org/10.3390/met12040628

AMA Style

Xiao S, Luan X, Liang Z, Wang X, Zhou T, Ding Y. Fracture Analysis of Ultrahigh-Strength Steel Based on Split Hopkinson Pressure Bar Test. Metals. 2022; 12(4):628. https://doi.org/10.3390/met12040628

Chicago/Turabian Style

Xiao, Shihong, Xiaosheng Luan, Zhiqiang Liang, Xibin Wang, Tianfeng Zhou, and Yue Ding. 2022. "Fracture Analysis of Ultrahigh-Strength Steel Based on Split Hopkinson Pressure Bar Test" Metals 12, no. 4: 628. https://doi.org/10.3390/met12040628

APA Style

Xiao, S., Luan, X., Liang, Z., Wang, X., Zhou, T., & Ding, Y. (2022). Fracture Analysis of Ultrahigh-Strength Steel Based on Split Hopkinson Pressure Bar Test. Metals, 12(4), 628. https://doi.org/10.3390/met12040628

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Fracture Analysis of Ultrahigh-Strength Steel Based on Split Hopkinson Pressure Bar Test

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