Showing papers by "Maik Gude published in 2004"

Contribution to the simulation of textile reinforced plastics under crash and impact loads

Abstract: Novel textile reinforced composites have outstanding specific mechanical properties and superb energy absorption capabilities, which makes them excellent candidates for impact and crash resistant elements. Despite their distinguished properties, textile reinforced composites have not experienced a broad application yet, mainly due to the lack of realistic failure models, that account for the complex mechanisms involved in the dynamic failure of such materials. In developing appropriate simulation and failure models for textile composites under dynamic loading, basic experimental investigations are required to understand the complex structural and failure mechanisms. The performed experiments provide the necessary knowledge to develop adapted material models, which take into account the textile reinforcement structure and serve for the simulation of the impact and crash behaviour with the help of numerical programs.

Design and test of advanced fibre-reinforced transmission shafts

Abstract: The high specific stiffness and strength of composite materials with ultra-high modulus (UHM) carbon fibers as well as the possibility of creating a load-adapted property profile are ideally suited for the design of advanced transmission shafts for mobile applications. For a reliable development of such safety relevant components, material properties under static and dynamic loading conditions as well as adapted manufacture processes, which ensure a reproduceable quality, are required. Therefore, extensive fracture tests were carried out under multi-axial loading in order to determine the static and dynamic strength behaviour of UHM-carbon fiber reinforced polymers. Additionally, an advanced construction concept for fibre-reinforced transmission shafts in combination with an adapted winding process was developed, which enables the integral manufacture of advanced lightweight transmission shafts.

Experimental and theoretical analysis of the stress strain fields at bolded joints of textile wood composites

Abstract: Kierunkowe wlaściwości kompozytow tekstylnych umozliwiają poprawe wytrzymalości w strukturach drewnianych, szczegolnie w obszarach polączen. W tych strefach drewno jest oslabione roznymi otworami albo metalowymi zlączami, ktore są odpowiedzialne za wystąpienie spietrzen naprezen. Szerokie badania eksperymentalne wzmocnionych struktur drewna z wykorzystaniem zaawansowanych metod optycznych, przeprowadzone w ILK, sluzyly określeniu niejednorodnego stanu naprezen oraz dodatkowo zweryfikowano je metodą elementow skonczonych. Slowa kluczowe: struktury drewna wzmocnione tekstylnie, eksperymentalna analiza naprezen, polączenia sworzniowe

Stress and failure analysis of thick-walled conical composite rotors

Abstract: The high specific strength and stiffness of composite materials, as well as the possibility of creating a load-adapted property profile of them are ideally suited for the design of high-speed lightweight rotors. With respect to a load-adapted reinforcement structure of composite rotors, the rotor geometry has a significant influence on the optimum fibre orientation. In the case of conical rotors—the structural behaviour is strongly influenced by centrifugally induced bending effects in the rotor structure, which cause complex three-dimensional stress states in combination with the ordinary tangential and radial stresses. For analysis of the resulting complex stress states, an analytical method has been developed and verified numerically as well as experimentally. The novel method presented here is the basis for a realistic failure analysis and, in particular, serves as an efficient tool for extensive parameter studies and optimizations within the design process.