Pre-fatigue damage on the mechanical properties of Q690D steel
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.
Open Research
DATA AVAILABILITY STATEMENT
The data that support the findings of this study are available from the corresponding author upon reasonable request.