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Full-Text Articles in Engineering
Micro-Ct Inspection Of Impact Damage In Carbon/Epoxy Rods, Lindsey Charlene Cahoon
Micro-Ct Inspection Of Impact Damage In Carbon/Epoxy Rods, Lindsey Charlene Cahoon
Theses and Dissertations
Various configurations of unidirectional carbon/epoxy composite rods were impacted radially, inspected using micro-CT scanning equipment, and tested in axial compression to measure the residual strength after impact. This data was used to correlate the relationship between impact energy, residual strength, and the peak crack area and total crack volume along the length of the specimens. These specimens represent local members of open three-dimensional composite lattice structures (e.g., based on isogrid or IsoTruss® geometries) that are continuously fabricated using advanced three-dimensional braiding techniques. The specimens were radially impacted with 2.5 J (1.9 ft-lbs), 5.0 J (3.7 ft-lbs), 7.5 J (5.6 ft-lbs), …
Evaluation Of Passive Force On Skewed Bridge Abutments With Controlled Low-Strength Material Backfill, Kevin Bjorn Wagstaff
Evaluation Of Passive Force On Skewed Bridge Abutments With Controlled Low-Strength Material Backfill, Kevin Bjorn Wagstaff
Theses and Dissertations
Although its use has become more widespread, controlled low-strength material, or CLSM, has fallen through the crack between geotechnical engineering and materials engineering research. The National Ready Mix Association states that CLSM is not a low strength concrete, and geotechnical engineers do not consider it as a conventional aggregate backfill. The use of CLSM as a bridge abutment backfill material brings up the need to understand the passive force versus backwall displacement relationship for this application. To safely account for forces generated due to seismic activity and thermal expansion in bridge design, it is important to understand the passive force …