Abstract
Electronics in mission- or safety-critical systems are expected to survive a wide range of harsh environments including thermal cycling, thermal ageing, vibration, shock, and combinations of the aforementioned stresses. The materials used in these electronic systems are diverse and frequently change as the electronics industry rapidly innovates. These materials are dual use, fulfilling both electrical and mechanical functions. Of particular interest are electronic materials classes such as polymers (e.g., encapsulants/potting and packaging), composites (e.g., hard potting and printed circuit boards), and interconnect materials (e.g., solder). Thus, predicting the operational response of electronics systems in harsh environments requires understanding of the materials constitutive response to the environmental characteristics for all the relevant materials. The paper estimates the rate-, temperature-, and pressure-dependent constitutive response of representative electronic materials. Experimental response of circuit boards, potting materials, and solder interconnects are measured in low and intermediate strain rate dynamic tests. Traditional mechanical sensors (e.g. strain gages and accelerometers) are complemented by non-contact techniques (e.g., laser velocimetery, high speed digital image correlation) to obtain high fidelity experimental data on material response. Estimates of the corresponding constitutive parameters are calculated, and observed features of the dynamic response are discussed.
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Abbreviations
- \( \rho \) :
-
Density
- \( \sigma \) :
-
Stress
- \( \varepsilon,\dot{\varepsilon} \) :
-
Strain strain rate
- \( \gamma,\dot{\gamma} \) :
-
Shear strain shear strain rate
- \( \tau,\dot{\tau} \) :
-
Shear stress shear stress rate
- g :
-
Acceleration (due to gravity)
- \( {k_B} \) :
-
Boltzmann’s constant
- \( {C_p} \) :
-
Heat capacity
- E :
-
Elastic modulus
- P :
-
Pressure
- T :
-
Temperature
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Acknowledgements
The authors would like to thank the Air Force Office of Scientific Research and the Department of Defense for supporting this research. Opinions, interpretations, conclusions and recommendations are those of the authors and are not necessarily endorsed by the United States Air Force.
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Lowe, R.D., Dodson, J.C., Foley, J.R., Mougeotte, C.S., Geissler, D.W., Cordes, J.A. (2014). Constitutive Response of Electronics Materials. In: Antoun, B., et al. Challenges In Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-00852-3_8
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