Aug 9, 2016 | No Comments | By Andrew Robinson
- Introduction: still working
- Need to find reference(s) for there being a gradient of strain rates in an impact event
- still looking for more cases of piezo actuators being used for a mechanical testing device
- Design Goals: mostly done
- achieve high signal to noise ratio for small specimens that have low fidelity Kolsky bar signals
- low compliance loading frame
- intermediate strain rates
- compatibility with placement on synchrotron optical tables and around vacuum x-ray tubes
- portability inside small pelican case for travel on airline
- Design Decisions: rough draft complete
- Experimental Procedure: still need to write, but should be straight forward to write
- Experimental Results: mostly done, convert forces to K_1?
- Discussion:
- focusing here mostly on the degree to which design goals were achieved as opposed to material response/phenomena
- Recommendations: done, changing as other sections are completed
- frame could be less thick given forces required to fracture small specimens
- choose a less compliant, less accurate vertical positioning stage. accomplish micron level positioning with an amplified piezo actuator. Currently a compromise was made between accurate positioning and compliance which resulted in a system not very suitable for high forces.
- Conclusions: done, changing as other sections are completed
- device was successful in delivering results for e_dot = [10, 40], need better triggering/more set up time to record entire event at e_dot = 100 +
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