Abstract
During high-speed tests using a hydraulic tensile machine, the force measurements are destroyed by the system ringing effect. In this work, the ringing of the test system was analyzed using FEM, which resulted in the development of a new type of test sample. Depending on the material’s elastic properties and plastic work hardening rate, the new specimen has a specially designed minor plastic deformation area in addition to the usual plastic deformation zone. A ringing-free sample area can be created so that the test force can be measured there using strain gauge sensors. The plastic deformation and damage behavior can be determined for a wide range of strain rate, from 0.0001 to 5000/s. Based on the equations for one-dimensional stress waves and the stress wave attenuation due to dislocation motion, a simplified model with analytical formulation could be established and programmed in MATLAB. Verifications show a good prediction of the sample’s geometry using this simplified model.
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Acknowledgements
This work was supported by the German Research Foundation (Deutsche Forschungsgemeinschaft, grant No.: FA 1024/5-1), to which I am indebted. The author also thanks Mr. Jens Olschewski for his MATLAB programming and Mr. Chongyang Zeng for his technical support.
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Fang, X. (2022). A New Sample for Oscillation-Free Force Measurement at High Strain Rates and Its Physical Principles. In: Inal, K., Levesque, J., Worswick, M., Butcher, C. (eds) NUMISHEET 2022. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-06212-4_70
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DOI: https://doi.org/10.1007/978-3-031-06212-4_70
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