Modeling of fatigue crack initiation in wire-bonds using a novel approach of strain gradient theory

Autor(en)

Martin Lederer, Golta Khatibi, Dominik Thuiner, Herbert Danninger

Abstrakt

The fatigue life of wire-bonds was measured with use of a 20 kHz ultrasonic testing system. Thereafter, the experiments were interpreted by Finite Element Analysis. First, simulations were performed according to classical continuum mechanics. They predicted stress concentrations at the location where crack initiation was found experimentally. However, the stress concentrations showed the characteristics of stress singularities even for loading cases corresponding to the regime of very high cycle fatigue, i.e. fairly moderate loads. In subsequent simulations, the singularities of stress concentrations could be removed on the basis of a newly developed version of strain gradient elasticity, resulting in predictions that agreed well with experimental results.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Technische Universität Wien

Journal

Key Engineering Materials

Band

592-593

Seiten

246-249

Anzahl der Seiten

4

ISSN

1013-9826

DOI

https://doi.org/10.4028/www.scientific.net/KEM.592-593.246

Publikationsdatum

2014

Peer-reviewed

Ja

ÖFOS 2012

102009 Computersimulation, 103018 Materialphysik, 201108 Bruchmechanik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/868fe7ad-4872-4412-bd13-53d7b3737931