Abstract
We report the in-plane shear properties, to fracture, of 200 μm-thick LIGA nanocrystalline Ni-10%Fe and micrograined Ni-10%Co. Planar simple shear specimens were designed, fabricated and pulled to fracture using a miniature commercial tension test stage. Forces were measured with a load cell and displacements were measured via digital image correlation. A procedure was developed to extract the shear strains from the displacements. We show shear stress vs shear strain curves to fracture for each material, at strain rates 0.001/s and 30/s. Tensile tests were also performed on both materials at strain rates 0.001/s and 1/s. Increases in shear strength, tensile strength, and true strain to fracture were observed at the higher strain rate, but rate effects were inconclusive for the Young’s modulus, shear modulus, and yield strength due to large measurement uncertainties. Finally, the stress triaxiality and equivalent plastic strain at fracture for the tensile and shear specimens were estimated and used to construct part of the fracture locus for the Ni-10%Fe material. It is anticipated that this data may be used to facilitate failure prediction models for LIGA MEMS.
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Acknowledgements
Specific commercial equipment, instruments, and materials that are identified in this report are listed in order to adequately describe the experimental procedure and are not intended to imply endorsement or recommendation by the National Institute of Standards and Technology (NIST). This project was funded by the U.S. Army Combat Capabilities Development Command Armaments Center (CCDC AC) and the Joint Fuze Technology Program (JFTP). The JFTP project number was 14-G-006, Micro Scale Materials and Energetic Effects Characterization.
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Liew, LA. et al. (2021). Experimental Study of Shear and Tensile Properties of LIGA Ni-Fe and Ni-Co Alloys at Quasi-static and Intermediate Strain Rates. In: Notbohm, J., Karanjgaokar, N., Franck, C., DelRio, F.W. (eds) Mechanics of Biological Systems and Materials & Micro-and Nanomechanics & Research Applications. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-59765-8_19
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