Interfacial Fracture Toughness Measurement of Welded Babbitt alloy
SnSb11Cu6/ 20Steel
Abstract
The interface fracture toughness of SnSb11Cu6/20steel was measured by
calculating the critical energy release rate and stress phase angle of
the interface crack. A three-point bending test was used to introduce
cracks into the bonding interface, and the cohesion model of the bonding
interface was established through experimental data. Through finite
element analysis of load-deflection curves with and without interface
crack propagation, the crack initiation point is found. Then the energy
calculation model of crack propagation is established, and the critical
energy release rate is obtained using the virtual crack growth
criterion. The calculation results of the stress phase angle show that
the crack propagation is greatly affected by the normal stress after the
babbitt alloy layer fractures. If the strength of the substrate material
is weaker, the crack will continue to expand in the tangent
perpendicular to the crack tip.