Shear testing is an established destructive method for evaluating not only the degree of any crack propagation and damage to the solder joint, but also the general strength of the joint. The method is based on the assumption that the presence of a crack in the solder joint, its size and the extent of its propagation will influence the strength of a joint. Other factors may include 'black pad' problems for NiAu, intermetallic formation and poor wetting.

The equipment (Dage Series 4000) allows for a range of shear rates, and as well as determining the ultimate shear strength (USS) for the joint a force/time plot can be obtained to assess the nature of the failure (brittle or ductile).

Common Applications

• Comparison of alloys, post thermal fatigue
• Testing for good joint formation with new platings, fluxes or finishes

Contact

Customer Service tel: +44 20 8943 8681
E-mail: materials_enquiries@npl.co.uk