Abstract
Bulk Sn96.5Ag3Cu0.5 samples were mechanically tested to investigate the effect of temperature, frequency and applied stress on the low cycle fatigue and stress relaxation behavior and the corresponding microstructure. Samples were tested under a variety of parameters including applied stresses between 8 and 80 MPa, temperatures of 25, 50, 100 and 150 °C and frequencies of 1, 0.1 and 0.01 Hz, respectively. Samples used for the stress relaxation behavior exhibited plastic behavior with increased softening behavior with increased stress levels, increased temperature and lower frequencies. Bayesian analysis revealed that stress relaxation behavior could be expressed in general by the following expression: ∆σ = AN B In the previous expression, Bayesian analysis showed that the testing frequency has an exponential dependency while the temperature has a power law dependency on the parameters A and b. The results of the low cycle fatigue study showed that life decreased with increased applied stress, decreased frequency and increased temperature. Bayesian analysis revealed that the low cycle fatigue behavior could be described by the following expression: ∆σ = G(logN)m. Additionally, Bayesian analysis showed that the testing frequency and temperature both have a power law dependency on the parameters G and m.
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Acknowledgments
The authors would like to thank Victor Ontiveros and Mohammad Nuhi for their help with experimental work/data analysis, CALCE and NISP Lab for their help with the SEM work. The authors would also like to acknowledge the SEEDS Fellowship Program (funded by the National Science Foundation).
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Paradee, G., Bailey, E. & Christou, A. Stress relaxation behavior and low cycle fatigue behavior of bulk SAC 305. J Mater Sci: Mater Electron 25, 4122–4128 (2014). https://doi.org/10.1007/s10854-014-2138-1
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DOI: https://doi.org/10.1007/s10854-014-2138-1