Abstract
This research investigates the effects of shock loading on a composite structure’s compressive residual strength. The research develops a methodology for evaluating and quantifying such damage using non-destructive imaging technologies, and develops a prediction equation for compressive residual strength of the damaged composite structure. Experiments and imaging of Cyply 1002 glass-fiber/epoxy laminate panels were conducted at the University of Rhode Island (URI) and the Naval Undersea Warfare Center Division, Newport (NUWCDIVNPT), respectively. Controlled air blast experiments were conducted using the shock tube at URI’s Dynamic Photomechanics Laboratory (DPML), inducing non-catastrophic damage on the panels. 3D Digital Image Correlation (DIC) was used to measure the transient response of the composite panels during blast loading, as well as material characterization and residual strength experiments. To evaluate the shock-induced damage in each composite panel, Terahertz (THz) and Flash Infrared Thermography (FIRT) were used to non-destructively obtain through-thickness images of the specimens before and after damage. The results of the research show that THz and FIRT imaging can be used to quantify internal damage in a composite laminate after shock loading. Additionally, residual strength experiments show that increased shock damage causes a reduction in compressive residual strength. An analytical relationship was developed using MATLAB to predict the residual strength of a composite panel as a function of a combined damage parameter.
Highlights
The research investigates the effects of shock damage on a composite structure’s compressive residual strength
After each panel was imaged on the Flash Infrared Thermography (FIRT) and THz systems, the data was analyzed to quantify the damage in each subpanel, in terms of the five damage parameters
Residual strength tests, and material characterization tests were conducted at University of Rhode Island (URI)’s Dynamic Photomechanics Laboratory; non-destructive imaging of Cyply 1002 glass-fiber/epoxy laminates was conducted at the Naval Undersea Warfare Center Division, Newport
Summary
The research investigates the effects of shock damage on a composite structure’s compressive residual strength. Through experimental techniques and non-destructive imaging technologies, the research develops a methodology for evaluating and quantifying such damage, and develops a prediction equation for compressive residual strength as a function of quantified damage. Within the marine and aerospace communities, there is an interest in using composite materials for the design of structures, coatings, and vehicles. Composite materials offer lower maintenance costs, reduced electromagnetic and radar signatures, and high strength-to-weight ratios. The ability of these advanced materials to retain structural functionality after a shock event is not well understood, driving composite structures to require conservative designs with much higher safety factors than their metallic counterparts. Data on the residual strength of composite materials will improve the design of composite structures that may be exposed to blast loading
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