Influence of Notch on Mechanical Properties of Cf/Mg Composite Fabricated by LSEVI

Abstract

C f /Mg composite was fabricated by liquid-solid extrusion following vacuum infiltration technique and uniaxial tensile tests were conducted on the notched and unnotched specimens to investigate the mechanical properties of C f /Mg composite. The effects of circular notch on the notched strength, net tensile strength, tensile modulus, and fracture strain of C f /Mg composite were investigated. The notch sensitivity of C f /Mg composite was elucidated through the notch strength ratio (NSR), fracture surface, and fracture mechanism. By comparing the experimental and theoretical NSR, the influences of notch size and stress concentration factor on notch sensitivity of C f /Mg composite were investigated. The results showed that the fracture strain of the notched specimens increased with increasing the notch size. Meanwhile, net tensile strength, notched strength, and tensile moduli had opposite trends. The NSR had a functional relationship with the notch size and stress concentration factor caused by the notch had no influence on the NSR.