An evaluation of solid bridge force using penetration to measure rheological properties

An experimental system was designed and constructed to measure the solid bridge force of high viscosity material. The material used for the experiments was paraffin. The experiment investigated the degree of neck tensile strength that resulted from the solid bridge force for each variation of bonding temperature, bonding time and contact pressure. A solid bridge force equation for high-viscosity materials was proposed based on a penetration parameter. The equation measured rheological properties. The results showed that the neck tensile strength was smaller than the material tensile strength at the same temperature because lattice defects existed in the neck region. The solid bridge force was determined by material tensile strength and rheological properties. The material tensile strength determined the magnitude of the solid bridge force. The rheological properties determined the developing trends of the solid bridge force. A comparison of the results from the adjusted penetration-based equation and the actual experiment showed that the average error was 26%. Also, the calculated results coincided better with the experimental results when the neck tensile strength was relatively large. The penetration-based equation showed promise for calculating the solid bridge force of other high-viscosity materials and evaluating their rheological properties.