Novel Device for Intermediate Strain Rate (ISR) Testing
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Date
2025-05
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Publisher
The Ohio State University
Abstract
Due to the strain rate sensitivity of materials, it is necessary to have reliable dynamic data, in order to calibrate material models used in Computer Aided Engineering. The difficulty of testing intermediate strain rates (ISR) arises from the oscillations and ringing produced during testing, as inertia manifesting itself as reflected elastic waves negatively affects the quality of test data. Additionally, intermediate strain rates are too slow for traditional high rate dynamic testing apparatuses, such as the Split Hopkinson Bar (SHB), as the duration of the test is limited by the length of the transmitter bar. Current approaches to testing at ISRs utilize a modified SHB, consisting of a high speed hydraulic actuator, and a very long transmitter bar, in order to eliminate unwanted oscillations from the data. To address the impractical size and complexity of existing ISR testing devices, the need for a more accessible test device arises. The topic of this research will explore a solution to this shortcoming by presenting a new ISR testing configuration consisting of an in-line spring-viscous damper mechanical element, in order to eliminate the need for a long transmitter bar or data filter. The design of the element will be informed by analytical and numerical modeling and existing hardware will be modified to test the concept experimentally.
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Keywords
Intermediate Strain Rate Testing, Mechanics of Materials, Split Hopkinson Bar, Split Hopkinson Long Bar