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Acoustical and Optical Determination of Mechanical Properties of Inorganically-Bound Foundry Core Materials

Sciprofile linkPhilipp Lechner, Sciprofile linkGeorg Fuchs, Sciprofile linkChristoph Hartmann, Sciprofile linkFlorian Steinlehner, Sciprofile linkFlorian Ettemeyer, Sciprofile linkWolfram Volk
Published: 3 June 2020
 by  MDPI
Materials , Volume 13; doi:10.3390/ma13112531

Abstract: Inorganically-bound sand cores are used in many light-metal foundries to form cavities in the cast part, which cannot be realised by the mould itself. To enable FEM simulations with core materials, their mechanical properties have to be measured. In this article, we adapt methods to determine the Young’s and shear modulus, the Poisson ratio and the fracture strain of sand cores. This allows us to fully parametrise an ideal brittle FEM model. We found that the Young’s and shear modulus can be obtained acoustically via the impulse excitation technique. The fracture strain was measured with a high-speed camera and a digital image correlation algorithm.
Keywords: elastic properties / shear modulus / fracture strength / Fracture strain / 3-point-bending / Water-glass / young’s modulus / inorganic sand core materials / Poisson’s number

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