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Determination of the life-time of solder joints under temperature and vibration loadings

: Meier, Karsten; Röllig, Mike; Lautenschlaeger, Georg; Schießl, Andreas; Wolter, Klaus-Jürgen; Meyendorf, Norbert

Michel, B.:
Micro materials, nano materials for automotives. Proceedings : The Micro Materials Center of Fraunhofer ENAS was presenting for the fifth time but first time on international level the MicroCar 2013 Conference held at Leipzig, Germany, on February 25 - 26, 2013 ; micromaterials and nanomaterials - challenges for reliability and safety of automotive engineering, automotive electronics, electromobility and clean microtechnologies
Dresden: ddp Goldenbogen, 2013 (Micromaterials and Nanomaterials 15)
MicroCar Conference <5, 2013, Leipzig>
Conference Paper
Fraunhofer IKTS ()
Weichlötverbindung; Risswachstum; Hochtemperatur; Elektronikgerät; keramischer Kondensator; Weichlötverbindung; Gebrauchsbedingung; schwingende Belastung; Beladungszustand; Raumtemperatur; Versuchsfahrzeug; Schädigungsmechanismus; simuliertes Ergebnis

Electronic devices for automotive applications represent a big market today. The number of these devices per car significantly increased within the last years. At the same time the mounting positions of the devices are close to engine, gear or suspension structures and therefore face harsh use conditions. Nevertheless the expected lifetime of these devices is 25 years or even more. Careful and comprehensive engineering is needed to fulfil the named requirements. To access the reliability of solder joints facing the described conditions an understanding of the damage mechanism driven by vibration and thermal loads need to be gained. To address this situation vibration experiments on as reflowed as well as on isothermally pre-aged (high temperature storage, HTS) ceramic chip capacitors were accomplished at room temperature. In a further set as reflowed specimen were exposed to vibration at 125°C. A strap like PCB was used enabling a defined load introduction. A next generation of these test vehicles including local heater functionality was used to accomplish the vibration at high temperature. Crack growth and failure cycles were investigated. Life time models for the different loading conditions were determined using experimental and simulation results.