Abstract
The dynamic behavior of three commonly used airplane fuselage materials is investigated, namely of Al2024-T3, Glare-3 and CFRP. Dynamic tensile tests using a servo-hydraulic and a light weight shock testing machine (LSM) have been performed. The results showed no strain rate effect on Al2024-T3 and an increase in the failure strain and failure strength of Glare-3, but no stiffening. The LSM results on CFRP were inconclusive. Two types of fracture tests were carried out to determine the dynamic crack propagation behavior of these materials, using prestressed plates and pressurized barrels, both with the help of explosives. The prestressed plates proved to be not suitable, whereas the barrel tests were quite reliable, allowing to measure the crack speeds. The tougher, more ductile materials, Al2024-T3 and Glare-3, showed lower crack speeds than CFRP, which failed in a brittle manner.
Highlights
Triggered by the growing terrorist threat, the EU VULCAN project [1] aims at strengthening airborne structures under blast and fire
An explosion is a highly dynamic event and the fuselage material behaves in a different manner as compared to a static load; stress waves, inertia, temperature and strain rate effects take place
The lowest and highest crack speeds were found for Glare and the CFRP respectively, since these are the toughest and the most brittle materials
Summary
Triggered by the growing terrorist threat, the EU VULCAN project [1] aims at strengthening airborne structures under blast and fire. Within this framework, TNO’s mission is to investigate the behavior of airplane fuselage materials under blast loading. An explosion is a highly dynamic event and the fuselage material behaves in a different manner as compared to a static load; stress waves, inertia, temperature and strain rate effects take place. The aim is of this paper is to characterize the dynamic behavior of these type of materials, in order to better understand their behavior and optimize the design of structures against blast of other types of dynamic loading events
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