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Testing And Simulation Of Reinforced Concrete Beams Under Impact Loading, Amin Pahlevannejad
Testing And Simulation Of Reinforced Concrete Beams Under Impact Loading, Amin Pahlevannejad
All ETDs from UAB
According to published data, three million human injuries and deaths occur annually because of motor vehicle crashes (National Highway Traffic Safety Administration). To help lessen the toll of this problem, the Federal Highway Administration (FHWA) has set a goal to improve the safety of roadways. One way to achieve this goal is increasing the use of the LS-DYNA finite element code in cash testing to model three-dimensional motor vehicle crashes. The objective is to protect the vehicle occupants from severe injury by making roadside safety structures more crashworthy. Reinforced concrete is one important part of bridges, barriers, and guardrail materials. …
Development, Characterization, And Modeling Of Ballistic Impact On Composite Laminates Under Compressive Pre-Stress, Eric Oscar Kerr-Anderson
Development, Characterization, And Modeling Of Ballistic Impact On Composite Laminates Under Compressive Pre-Stress, Eric Oscar Kerr-Anderson
All ETDs from UAB
Structural composite laminates were ballistically impacted while under in-plane com-pressive pre-stress. Residual properties, damage characterization, and energy absorption were compared to determine synergistic effects of in-plane compressive pre-stress and impact velocity. A fixture was developed to apply in-plane compressive loads up to 30 tons to structural composites during an impact event using a single-stage light-gas gun. Observed failure modes included typical conical delamination, the development of an impact initiated shear crack (IISC), and the shear failure of a pre-stressed composite due to impact. It was observed that the compressive failure threshold quadratically decreased in relation to the impact velocity up …