Glare luggage containers for aircrafts are being developed by FMLC. One of the purposes is to minimize the weight to strength ratio of these containers. Therefore the response of an adhesive to high strain rate loading has been investigated experimentally. Extremely flexible and tough material behaviour has been revealed even at high strain rates.
Methods used:
In automobile industry there is an increasing interest in lighter and stronger materials. In addition, new materials are being developed with improved crash-resistant properties. This implies the high rate testing and measurement of fracture properties at high strain rates. A project has been carried out on two different composite materials. The materials consisted of fiber reinforced plastics with different fiber structures.
The image sequence show a number of high speed film images from a tensile test on fiber reinforced plastic.
Glare® is a fibre-metal laminate being applied in the new Airbus A380 and consists of several layers of aluminium and fiberglass composite. In case of bird strike on the leading edges of wings and tail of the aircraft, the material experiences very high and concentrated impact loads. The purpose of this project is to measure the strength of Glare at high impact velocities. From an extensive experimental program the strength properties of several types of Glare are being measured. A relation between the impact velocity (or strain rate) and the strength has been derived. It was found from this project that Glare exhibits excellent impact properties which makes it suitable for rapid loading and high strain rate applications.
Methods used:
A variety of stainless and regular steels have been tested in several projects at a range of strain rates in order to investigate the resistance of the materials at crash loads. These crash loads occur during accidents such as car crash. Considerable straining has been measured even at high strain rates and an elevated material strength.
Ref:
JUHO TALONEN, PERTTI NENONEN, GERSOM PAPE, and HANNU HÄNNINEN, Effect of Strain Rate on the Strain-Induced ‘-Martensite Transformation and Mechanical Properties of Austenitic Stainless Steels, METALLURGICAL AND MATERIALS TRANSACTIONS A, VOLUME 36A, FEBRUARY 2005-421
Ref:
Juho Talonen, EFFECT OF STRAIN-INDUCED a’-MARTENSITE TRANSFORMATION ON MECHANICAL PROPERTIES OF METASTABLE AUSTENITIC STAINLESS STEELS, Dissertations 71, Espoo 2007, Doctoral Dissertation, Helsinki University of Technology, Department of Mechanical Engineering, Laboratory of Engineering Materials, 2007
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DTRL contributed to a research & development program on less-lethal ammunition using gel material by performing tensile tests at low, intermediate and high speed. High speed camera image analysis is applied to determine the material strain and strain rate. The strain rate dependent material behaviour was derived from the experiments and applied to fit an appropriate material model for Finite Element simulations, including visco-elastic behaviour. At high tensile velocities the moving stress wave is clearly visible.