- Tytuł:
- Experimental support for numerical simulations of energy absorbing structures
- Autorzy:
-
Ochelski, S.
Gotowicki, P. - Powiązania:
- https://bibliotekanauki.pl/articles/243303.pdf
- Data publikacji:
- 2008
- Wydawca:
- Instytut Techniczny Wojsk Lotniczych
- Tematy:
-
polymer composites
energy absorbing structures
sandwich structures
specific energy absorption
experimental methods - Opis:
- This paper presents experimental investigations of mechanical properties of materials used in the absorbing energy structures. Numerous experimental investigations are essential to develop a reliable numerical model of composite structures absorbing the impact energy. This model should correctly describe the dissipation of kinetic impact energy in the progressive crush process. Mechanical properties of composite materials like elastic modulus, strength, failure strains with influence of anisotropic properties are obtained experimentally. Different strength hypotheses are used for fibrous composites. The investigations on the complex stress state allow determining which of these theories describes the composite best. It was proved that both the matrix type and the structure of the composite have a very large influence on the SEA (Specific Energy Absorption), in particular on their crack propagation resistance. The dependence between the energy absorbed by a single energy absorbing element and a fragment of the structure absorbing the impact energy was discussed. Friction forces play the important role in the progressive crush of composites and they should be taken into account in developing a valid numerical model. Some authors state that the friction forces absorb 40% of the impact energy. The influence of failure strain rates on the absorbing energy capability, which is not clearly defined in the literature about composite structures, was also discussed.
- Źródło:
-
Journal of KONES; 2008, 15, 1; 183-217
1231-4005
2354-0133 - Pojawia się w:
- Journal of KONES
- Dostawca treści:
- Biblioteka Nauki
Artykuł