Numerical study of compact shear (Mode II) type test specimen geometry |
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Authors: | Mohamed Derradj Salah Kaci |
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Affiliation: | (1) Laboratoire de Modélisation Expérimentale et Numérique des Matériaux et Structure en Génie Civil, Université Mouloud Mammeri, Tizi-Ouzou, BP 17 RP, 15000 Tizi-Ouzou, Algeria |
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Abstract: | The Iosipescu shear test specimen geometry has been investigated by a number of research workers in recent years with conflicting
results. The paper describes a numerical study of a compact shear test specimen, based on the Iosipescu geometry, which is
proposed to investigate size effects in shear failure. A range of geometries has been studied and the extreme cases are reported.
Results are presented for the largest absolute principal stresses together with a detailed study of the stresses between and
around the roots of the two notches introduced in the test specimens. The results for the largest absolute principal stresses
show that tensile stresses are created at the roots of the two notches. These tensile stresses may result in Mode I failure
and probably account for the Mode I or mixed mode fracture observed in tests using the Iosipescu geometry. The results for
the distribution of stresses between the roots of the two notches show that deep notches increase the likelihood of shear
fracture prior to tensile failure. Shallow notches give a stress distribution similar to that developed in the indirect tensile
test and hence tensile failure is likely to precede shear failure in such cases. Further numerical and experimental work is
proposed.
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Keywords: | Shear test specimen Concrete Size effect |
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