Experimental study on the mechanical properties of NPR steel bars at high temperatures

Abstract

Negative Poisson ratio (NPR) steel is a new material with high strength and toughness. This study conducted tensile tests at elevated temperatures to investigate the mechanical properties of NPR steel at high temperatures. The stress – strain curve, ultimate strength, yield strength, modulus of elasticity, elongation after fracture, and percentage reduction of area of NPR steel bars were measured at 9 different temperatures ranging from 20 to 800 °C. The experimental results indicate that high-temperature environments significantly affect the mechanical properties of NPR steel. However, compared to other types of steel, NPR steel exhibits better resistance to deformation. When the test temperature is below 700 °C, NPR steel exhibits a ductile fracture characteristic, while at 800 °C, it exhibits a brittle fracture characteristic. Finally, based on the experimental findings, a constitutive model suitable for NPR steel at high temperatures is proposed.

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Central South University