Volume 46, Issue 9 pp. 3306-3320
ORIGINAL ARTICLE

Pre-fatigue damage on the mechanical properties of Q690D steel

Liang Zong

Corresponding Author

Liang Zong

School of Civil Engineering, Key Laboratory of Coast Civil Structure Safety, Ministry of Education, Tianjin University, Tianjin, China

Correspondence

Liang Zong, School of Civil Engineering, Key Laboratory of Coast Civil Structure Safety, Ministry of Education, Tianjin University, Tianjin 300072, China.

Email: [email protected]

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Heng Liu

Heng Liu

School of Civil Engineering, Key Laboratory of Coast Civil Structure Safety, Ministry of Education, Tianjin University, Tianjin, China

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Qi Si

Qi Si

School of Civil Engineering, Key Laboratory of Coast Civil Structure Safety, Ministry of Education, Tianjin University, Tianjin, China

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Kwai-Fai Chung

Kwai-Fai Chung

Chinese National Engineering Research Centre for Steel Construction (Hong Kong Branch), The Hong Kong Polytechnic University, Hong Kong, Hong Kong

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First published: 15 June 2023
Citations: 1

Abstract

This article aims to analyze the influence of high-cycle fatigue damage on the mechanical properties and low-cycle fatigue performance of Q690D. Monotonic tensile and cyclic loading tests were performed on Q690D specimens with different degrees of high-cycle fatigue damage. Degradation models were established to describe the declining trend of mechanical properties with the increase of pre-fatigue damage. Manson–Coffin models for Q690D steels of different pre-damage levels were established. Besides, a comparison was presented between Q690D and Q355B. The research work in this article provides a fundamental reference for the appropriate assessment of the mechanical performance of Q690D high-strength steel structures after long-term alternating loading.

Highlights

  • Degradation models of Q690D mechanical behavior with different pre-damages were proposed.
  • Manson–Coffin models for Q690D steels of different pre-damage levels were established.
  • A cyclic constitutive model of Q690D was established and validated.
  • A comparison of the influence of high-cycle fatigue (HCF) was presented between Q690D and Q355B.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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