Detection of Pad Crater Initiation in Shock Using Acoustic Emission Detection
Authors: W. Carter Ralph, Gregory N. Morscher, Elizabeth Elias Benedetto, Keith Newman, Aileen Allen, and Julie Silk Company: Southern Research Institute, The University of Akron, Hewlett-Packard, Keysight Technologies Date Published: 9/27/2015
Abstract: Acoustic emission detection was used to identify damage events on electronic assemblies during mechanical shock testing. Two board designs manufactured from several laminate types were instrumented with acoustic transducers and dropped multiple times at acceleration levels between 100 and 250g. Acoustic events that indicated a failure within the footprint of the ball grid array were identified and located using triangulation. Dye stain and cross section failure analysis techniques were used to identify pad crater damage and showed good agreement with the acoustic events. The results indicate that acoustic emission detection can be used to identify and locate pad cratering during shock within approximately 5 mm, and has the potential to significantly improve the speed and precision of mechanical shock testing.