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Thermo-mechanical simulation of plastic deformation during temperature cycling of bond wires for power electronic modules

Thermomechanische Simulation der platsischen Deformation von Bonddrähten für leistungselektronische Module während einer thermischen Wechselbelastung
: Wright, Alan; Hutzler, Aaron; Schletz, Andreas; Pichler, Peter

Postprint urn:nbn:de:0011-n-2905775 (1.0 MByte PDF)
MD5 Fingerprint: b15dfdea1d950a7b22b4ee9748541a60
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Erstellt am: 22.5.2014

Institute of Electrical and Electronics Engineers -IEEE-:
15th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2014 : 7-9 April 2014, Ghent , Belgium
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-4791-1 (Print)
ISBN: 978-1-4799-4790-4
International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE) <15, 2014, Ghent>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IISB ()
bond wire; thermal cycling; plastic deformation

Modelling was undertaken to investigate the role of bond wire size on reliability in power electronic converters. Experiments have shown that thin 125 µm Al wires used in place of 375 µm Al wires alleviate bond wire lift-off and further outlast other sources of failure such as solder degradation in a power module. To investigate the role of bond-wire size on wire lift-off, the effective plastic strain was estimated through thermo-mechanical simulation. Three-dimensional models were constructed for the thin and thick bond wires, respectively. For the critical deformation of the aluminium bond wires during thermal cycling, a temperature-dependent bi-linear plasticity model was used. The effect of a difference in yield strength for the thin wires was also investigated. Maximum as well as volumetrically averaged values of the effective plastic strain showed significant differences between the thick and thin wires and wires with different yield strengths. The modelling results show higher effective plastic strain for the thick wires - supporting the experimental findings.