This study explored key factors affecting the uniaxial tensile mechanical behavior of heavy-duty anti-corrosion coating layers in steel structures.It aimed to build a comprehensive constitutive model,considering multiple factors.Selecting a three-layer coating system for steel structures,comprising primer,intermediate paint,and topcoat,as the subject of study.Uniaxial tensile tests were performed using the controlled variable method,recording mechanical performance indicators including tensile strength and fracture elongation rate.The experiments were conducted over a temperature range of-20 ℃ to 50 ℃,with strain rates varying from 6.67× 10-⁴ s-¹ to 1.67×10-² s-¹,and with intermediate paint thicknesses ranging from 140 μm to 700 μm.The study quantitatively analyzed the impact of each factor on the mechanical properties of the coating layer.Based on the Sherwood-Frost model theory,combined with the material characteristics of the heavy anti-corrosion coating and experimental results,a constitutive model incorporating temperature,strain rate,and thickness was established.The reliability of this model was verified through uniaxial tensile tests under constant strain rate,considering the coupled conditions of temperature and intermediate paint thickness.The research results are shown as follows.Within the range of-20 ℃ to 50 ℃,an increase in temperature significantly increases the fracture elongation rate and decreases the elastic modulus of the coating.Within the given strain rate range,an increase in strain rate significantly enhances both the tensile strength and elastic modulus of the coating.The most pronounced mechanical response concerning the thickness of the intermediate paint is observed at 560 μm.The constitutive model developed in this study,with a correlation coefficient of 0.97 or higher,effectively describes and predicts the tensile mechanical performance of the coating layer under various single or combined factor influences.This research can provide theoretical support for the design and application of heavy anti-corrosion coating layers for steel structures,and offer reference for similar structural corrosion protection design and studies.
关键词
钢结构/重防腐涂装/力学性能/影响因素/本构模型
Key words
steel structures/heavy-duty anti-corrosion coating/mechanical properties/influencing factors/constitutive model
维普
万方数据