Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Micro & nanoDAC - A powerful technique for nondestructive microcrack evaluation

: Michel, B.; Vogel, D.


Meyendorf, N.; Baaklini, G.Y.; Michel, B. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nondestructive evaluation and reliability of micro- and nanomaterial systems : 18 - 19 March 2002, San Diego, USA
Bellingham/Wash.: SPIE, 2002 (SPIE Proceedings Series 4703)
ISBN: 0-8194-4451-0
Conference "Nondestructive Evaluation and Reliability of Micro- and Nanomaterial Systems" <2002, Newport Beach/Calif.>
Conference Paper
Fraunhofer IZM ()

Recent advances in microelectronics and electronic packaging technology have led to a strong need in strain and stress analysis on micro and nano scale as well. Smallest cracks, delaminations and defects are a concern and can initiate defect propagation and can also cause failure of whole components. Crack detection and evaluation for crack lengths of very small microcracks are required. The authors present an approach to deformation measurement based on local correlation analysis on captured micrographs. Incremental displacement and strain fields are extracted from SEM and AFM images picked up for different object loading states. The application of the method is demonstrated by investigations of electronic packages. Fracture mechanics has been applied to combine the experimental results with advanced fracture and reliability concepts. Displacement fields in the immediate vicinity of micro and nano crack tips and crack opening displacements as small as some nanometers h ave been measured. They are used to determine fracture parameters. The results have also been used as input parameters in parametrized finite element simulation.