Influence of the selection of different construction materials on the stress–strain state of the track

Abstract

Abstract The properties of epoxy asphalt materials and carbon fiber composites are closely related to temperature, so it is important to study the mechanical properties of these two materials when they are used in track at different temperatures. The parallel analysis method is adopted in this study. The carbon fiber composite is regarded as a continuous elastomer, and its stress and strain components are fully expressed in a matrix form in a three-dimensional coordinate system. Finally, 21 elastic constants are selected. At the same time, the mechanical properties of epoxy asphalt materials in viscoelastic and tensile aspects were studied considering the temperature zone expansion factor. The results show that the maximum degradation of carbon fiber composites in tensile strength occurs at low temperature and dry state, and the degradation rate is 30.8%. In terms of compressive strength, the maximum degradation rate of the material is 21.9% under high temperature and wet conditions. The elongation at break of epoxy asphalt materials showed a trend of first increasing and then decreasing. In the whole working temperature zone, it increased from 311.78 to 354.55% and then decreased to 228.89%. The bond elongation first increases and then decreases. Taking 0℃ as the dividing point, the bond elongation increases from 85.7% at − 20℃ to 256.7% at 0℃ in the temperature zone below 0℃, while it decreases from 256.7% at 0℃ to 80.6% in the temperature zone above 0℃. Therefore, the mechanical properties of the two materials have the characteristics of high temperature sensitivity.