Abstract
Materials that may appear to be homogeneous to the naked eye are, in fact, highly inhomogeneous when viewed through a microscope. To a design engineer, geometric irregularities alone are not sufficient for defining the strength of material. The load carrying capacities of structural members as a function of their corresponding elongations are necessary. Such information can be obtained by subjecting specimens with simple geometries to tensile or compressive loads at controlled loading rates. The resulting data plotted in terms of uniaxial stress and strain can be linear or nonlinear depending on the combined effect of specimen size and geometry, loading rate and material type. This procedure presents fundamental difficulties in design when the stress and strain response becomes nonlinear. Lacking in particular is a knowledge of how uniaxial test data could be used under service conditions where the stress states are multiaxial.
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Sih, G.C. (1985). Non-Linear Response of Concrete: Interaction of Size, Loading Step and Material Property. In: Shah, S.P. (eds) Application of Fracture Mechanics to Cementitious Composites. NATO ASI Series, vol 94. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5121-1_1
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DOI: https://doi.org/10.1007/978-94-009-5121-1_1
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