Thesis
Multi-axial testing of carbon composite cylinders
Washington State University
Master of Science (MS), Washington State University
2014
Handle:
https://hdl.handle.net/2376/102341
Abstract
This work aims at creating a specimen that allows for a full range of independently controlled multi-axial loads to be introduced resulting in a full failure envelope that can be evaluated by common failure criteria. The FEA designed specimen allowed for more controlled and predictable load introduction with reduced errors due to stress concentrators, specimen fixture attachment, and premature material failure. An external jacket was created to allow for external pressure scenarios to be explored. The shape of plotted failure stresses and strains suggested that the straight lines of a limit based failure criterion provide the best representation of the specimen failure envelope. Failure modes were determined based on these lines with applied specimen loads and verified by failure surface crack orientations. From damage observations four failure modes, axial tension, hoop, shear, and axial compression, were found to describe the specimen. Experimental failure strains were found to agree well with Maximum Strain failure criterion when used with in-situ cylindrical failure strains, predicting failure strains within 10% of experimental values for 18 out of 26 specimens. Analysis of these failure strains in conjunction with predictions from failure criterion led to the conclusion that the majority of tested specimens were best described by matrix failure (transverse and shear) rather than fiber failure.
Metrics
6 File views/ downloads
13 Record Views
Details
- Title
- Multi-axial testing of carbon composite cylinders
- Creators
- Christopher James Starke
- Contributors
- Lloyd V. Smith (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900524859401842
- Language
- English
- Resource Type
- Thesis