Residual stress change resulting from stress corrosion in Carrara marble
This investigation will contribute to a sparse dataset of measured type II and III residual stresses in natural rock, and provide first data on their relationship to material damage resulting from stress corrosion under constant or cyclic tensile loading. Although these residual stresses have been shown to play a fundamental role in determining the elastic behavior of engineering materials, their effect on brittle and elastic rock materials remains unclear. We will undertake standard notched 3-point bending tests on samples of Carrara marble over a 1 - 2 month preparatory testing period. During this period weak HCl solution will be applied to artificial cracks created at the center of five samples subjected to high bending stresses overprinted by low-magnitude cyclic loading. Induced stress corrosion is expected to interact with type II and III residual stresses as tensile bonds enhance the kinetics of chemical reactions. Resulting material degradation will preferentially relax local lattice stresses, and therefore maximum residual stress magnitudes. We expect this effect will be evident in a narrowing of calcite diffraction peaks observed using the D2B or SALSA beam lines.
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LEITH Kerry; HOFMANN Michael; PIRLING Thilo; SUARD Emmanuelle; VOIGTLAENDER Anne and WALTER Jens. (2014). Residual stress change resulting from stress corrosion in Carrara marble. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-149
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