The thermoelastic stress analysis of low alloy corrosion-resistant steel sheets and weathering resistance steel plates is a method based on the theory of thermoelasticity, which studies the stress generated by thermal expansion and contraction under constraints during temperature changes and related characteristics. Combining the material properties of these two types of steel plates (such as alloy composition, rust layer formation, and mechanical properties), their thermoelastic stress analysis mainly includes the following aspects:

1. Temperature Dependence Analysis of Thermophysical and Mechanical Parameters of Materials

The essence of thermoelastic stress is "constrained deformation caused by temperature changes". Therefore, it is first necessary to clarify the key parameters of the material at different temperatures, which is the basis of the analysis:

 

Thermophysical parameters: Including coefficient of thermal expansion (α), thermal conductivity (λ), specific heat capacity (c), etc. Due to the inclusion of alloying elements such as Cr, Cu, and Ni, low alloy corrosion-resistant steel and weathering steel generally have a lower coefficient of thermal expansion than ordinary carbon steel (approximately 10-12×10⁻⁶/°C), which increases slightly with temperature. Their thermal conductivity is slightly lower than that of carbon steel (approximately 40-50 W/(m·K)), and specific values at different temperatures need to be determined through experiments or manuals.

Mechanical parameters: Changes in elastic modulus (E), Poisson's ratio (μ), yield strength (σₛ), etc., with temperature. At room temperature, the elastic modulus of both types of steel is approximately 200-210 GPa, and the Poisson's ratio is 0.28-0.3. However, the elastic modulus decreases at high temperatures (e.g., above 300°C), which must be considered in the analysis to ensure the accuracy of stress calculations.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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