TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Moers, Cassandra
A1  - Dresbach, Christian
T1  - Influence of R-Ratio on Fatigue of Aluminum Bonding Wires
JF  - Metals
N2  - Bonding wires made of aluminum are the most used materials for the transmission of electrical signals in power electronic devices. During operation, different cyclic mechanical and thermal stresses can lead to fatigue loads and a failure of the bonding wires. A prediction or prevention of the wire failure is not yet possible by design for all cases. The following work presents meaningful fatigue tests in small wire dimensions and investigates the influence of the R-ratio on the lifetime of two different aluminum wires with a diameter of 300 μm each. The experiments show very reproducible fatigue results with ductile failure behavior. The endurable stress amplitude decreases linearly with an increasing stress ratio, which can be displayed by a Smith diagram, even though the applied maximum stresses exceed the initial yield stresses determined by tensile tests. A scaling of the fatigue results by the tensile strength indicates that the fatigue level is significantly influenced by the strength of the material. Due to the very consistent findings, the development of a generalized fatigue model for predicting the lifetime of bonding wires with an arbitrary loading situation seems to be possible and will be further investigated.
KW  - aluminum bonding wire
KW  - small-scale fatigue testing
KW  - R-ratio
KW  - power electronics
UN  - https://nbn-resolving.org/urn:nbn:de:hbz:1044-opus-65588
SN  - 2075-4701
SS  - 2075-4701
U6  - https://doi.org/10.3390/met13010009
DO  - https://doi.org/10.3390/met13010009
VL  - 13
IS  - 1
SP  - 10
S1  - 10
PB  - MDPI
CY  - Basel
ER  -