Estimation of Sound Velocity, Tensile Strength and Damping Capacity of Cast Iron with Effective Area Fraction Model

Abstract

  Effects of chemical composition, shape of graphite and matrix structure upon the sound velocity, tensile strength and damping capacity of cast iron were investigated by the use of an effective area fraction model. Flaky and CV graphites are represented by a disk of d in diameter and t in thickness, and spheroidal graphite is represented by a sphere of d in diameter in this model. The effective area fraction of matrix, A_ef, is expressed as functions of graphite weight (g) in 1cm³ of cast iron and d/t ratio respectively for flaky and CV graphite cast irons. The degree of spheroidization is expressed as a function of d/t. Tensile strength of cast iron is expressed as a function of A_ef. The damping capacity, Q⁻¹, of cast iron is expressed as a first approximation of Young's modulus. The damping capacity increases with increasing of the graphite amount and d/t ratio.