Journal ArticleDOI
Experimental strain analysis of the losipescu shear test specimen
D. F. Adams,E. Q. Lewis +1 more
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In this article, an experimental strain analysis of the losipescu shear test specimen was performed, utilizing a 20-ply AS4/3501-6 carbon/epoxy unidirectional composite.Abstract:
An experimental strain analysis of the losipescu shear test specimen was performed, utilizing a 20-ply AS4/3501-6 carbon/epoxy unidirectional composite. Using three-element strain-gage rosettes, it was shown that the presence of loading-point-induced transverse normal strains in the gage section do not affect the measured shear strain. Thus, the shear modulus determined using the standard notch specimen is not affected. Likewise, modulus determination is not influenced by cracking at the notch tips, since this occurs at strains beyond the range over which modulus is determined. To further evaluate the effect of notch-tip cracking, material was removed adjacent to the standard V-notches where these cracks initiate. The measured shear strength was unaffected by removing this material, although the shear modulus was reduced slightly (by as much as eight percent for the more grossly exaggerated geometries).read more
Citations
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In vivo locomotor strain in the hindlimb bones of alligator mississippiensis and iguana iguana: implications for the evolution of limb bone safety factor and non-sprawling limb posture
TL;DR: Measurements of in vivo locomotor strain from the limb bones of lizard and crocodilian species, animals from previously unsampled phylogenetic lineages with non-parasagittal limb posture and kinematics suggest that, in some lineages, strain magnitudes may not have been maintained at constant levels through the evolution of a non-sprawling posture.
An Evaluation of the Iosipescu Specimen for Composite Materials Shear Property Measurement. Ph.D. Thesis
TL;DR: A detailed evaluation of the suitability of the Iosipescu specimen tested in the modified Wyoming fixture is presented in this article, where a linear finite element model of the specimen is used to assess the uniformity of the shear stress field in the vicinity of the notch, and demonstrate the effect of the nonuniform stress field upon strain gage measurements used for the determination of composite shear moduli.
Journal ArticleDOI
Determination of shear strength of unidirectional composite materials with the Iosipescu and 10° off-axis shear tests
Gregory M. Odegard,Maciej Kumosa +1 more
TL;DR: In this article, the authors determined the shear strength of a unidirectional carbon-fibre/epoxy composite by means of the 10° off-axis and 0° Iosipescu specimens subjected to shear.
Journal ArticleDOI
Measurement of the in-plane shear strengths of unidirectional composites with the Iosipescu test
Fabrice Pierron,Alain Vautrin +1 more
TL;DR: In this paper, the in-plane shear strength of unidirectional carbon/epoxy composites from Iosipescu specimens is measured and a description of the failure of the samples is presented together with finite-element calculations that confirm the observations.
Journal ArticleDOI
Saint-Venant effects in the Iosipescu specimen
TL;DR: It is shown that modification of the Wyoming fixture can lead to the elimination of its parasitic in-plane and out-of-plane movements and that averaging the between the two faces eliminates this effect.
References
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Book
Elasticity in engineering mechanics
TL;DR: In this paper, the authors introduce concepts and mathematics of Elasticity in Cartesian Coordinates, and three-dimensional equations of elasticity in the plane and the polar coordinates.
Book
Advanced Strength and Applied Stress Analysis
TL;DR: In this paper, the authors discuss the concepts of force, stress, strain, and displacement in the theory of elasticity, and propose a finite element model for stress and strain analysis.
An Evaluation of the Iosipescu Specimen for Composite Materials Shear Property Measurement. Ph.D. Thesis
TL;DR: A detailed evaluation of the suitability of the Iosipescu specimen tested in the modified Wyoming fixture is presented in this article, where a linear finite element model of the specimen is used to assess the uniformity of the shear stress field in the vicinity of the notch, and demonstrate the effect of the nonuniform stress field upon strain gage measurements used for the determination of composite shear moduli.
Journal ArticleDOI
Comparison of torsion tube and Iosipescu in-plane shear test results for a carbon fibre-reinforced epoxy composite
TL;DR: In this paper, the results of comparison tests run on AS4/3501-6 carbon fiber-reinforced epoxy composite were presented, with average initial modulus values differing by 1%, failure stress by 5% and failure strain by 31%.
Journal ArticleDOI
An Evaluation of the Iosipescu Specimen for Composite Materials Shear Property Measurement
TL;DR: In this paper, a detailed evaluation of the suitability of the Iosipescu specimen tested in the modified Wyoming fixture is presented, using conventional strain gage instrumentation and moire interferometry.