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WEI Yapeng. Study on Uniaxial Tensile Test and Constitutive Model of Steel Structure Coating[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230591
Citation: WEI Yapeng. Study on Uniaxial Tensile Test and Constitutive Model of Steel Structure Coating[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230591

Study on Uniaxial Tensile Test and Constitutive Model of Steel Structure Coating

doi: 10.3969/j.issn.0258-2724.20230591
  • Received Date: 07 Nov 2023
  • Rev Recd Date: 22 Mar 2024
  • Available Online: 18 Feb 2025
  • To study the mechanical constitutive model of steel bridge coating, uniaxial tensile tests were carried out on the long-lasting coating system, obtaining the stress–strain curves for the topcoat, intermediate coat, primer, and composite coating. The unified expression for the constitutive equation of the ascending segment of the long-lasting coating system was obtained through dimensionless processing, with corresponding constitutive equations provided for each coating film. The results are as follows. 1) The stress–strain curve for H06-X epoxy zinc-rich primer (80% zinc content) and long-lasting composite coating consists of an elastic and plastic stage, a strain-hardening stage, and a failure stage; the stress–strain curve for H06-C2 epoxy thick mica ferric oxide intermediate coat consists of a strain-hardening stage and a failure stage; the stress–strain curve for E01-JY fluorocarbon topcoat consists of an approximate linear elastic stage and a failure stage. 2) Based on the stress–strain curves, the mechanical property parameters of the primer, intermediate coat, topcoat, and composite coating, such as the elastic modulus, Poisson’s ratio, shear modulus, uniaxial tensile strength, and tensile fracture strain, are obtained. The primer shows the highest uniaxial tensile strength, followed by the intermediate paint, with the topcoat being the weakest. In contrast, the topcoat exhibits the best deformability, followed by the intermediate coat, with the primer showing the worst.

     

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