On the Effect of Shear on Plastic Deformation of Beams Under Transverse Impact Loading
01 Mar 1960-Journal of Applied Mechanics (American Society of Mechanical Engineers)-Vol. 27, Iss: 1, pp 107-110
About: This article is published in Journal of Applied Mechanics.The article was published on 1960-03-01. It has received 21 citations till now. The article focuses on the topics: Simple shear & Shear rate.
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TL;DR: In this article, a series of experiments has been conducted, utilizing sheet explosive opplied to clamped aluminum beams, with a neoprene buffer, and three damage modes are identified, which respecitively are major inelastic deformation, tearing at the extreme fiber, and transverse shear at the support.
Abstract: A series of experiments has been conducted, utilizing sheet explosive opplied to clamped aluminum beams, with a neoprene buffer. As the load is monotonically increased, three damage modes are identified, which respecitively are major inelastic deformation, tearing at the extreme fiber, and transverse shear at the support.Satisfactory correlation is reported for the extent of inelastic deformation using a lumped parameter, finite-difference code; thresholds for tearing and shear failure based on empirical criteria are presented. Using a Timoshenko beam theory, the shear threshold appears to be dependent on the section velocity, rather than upon the shear stress.
252 citations
TL;DR: In this paper, an experimental and analytical investigation of steel square hollow sections subjected to transverse blast load, applied with explosive uniformly distributed along the length of the member, was conducted, and three different section sizes were tested over three different lengths, and the members were fully clamped at their ends.
Abstract: Thin-walled steel hollow sections are used extensively in the construction, offshore, mining and security industries. Such members subjected to blast loads are of interest due to increased security demands and the occurrence of accidental or intentional explosive events. This paper reports an experimental and analytical investigation of steel square hollow sections subjected to transverse blast load, applied with explosive uniformly distributed along the length of the member. Three different section sizes were tested over three different lengths, and the members were fully clamped at their ends. The explosive loads were sufficient in magnitude to cause plastic deformation of the cross-section (local deformation), plastic flexural deformation of the overall member (global deformation), and tensile tearing at the supports. The energy dissipated in the local deformation is determined using rigid-plastic analysis and yield line mechanisms of the deformed cross-sections. The total input energy minus the energy dissipated in local deformation is assumed to be expended in flexural deformation. Analytical solutions using the energy consumed in flexural deformation are shown to produce bounded solutions of the transverse plastic deformation of the members. Finally, a semi-empirical solution is suggested that can be used to aid in design.
40 citations
01 Jan 1977
TL;DR: In this article, an analysis of the dynamic behavior and permanent deformation of a rigid-perfectly plastic beam subjected to blast-type loading is presented, where the beam is simply supported at the ends, and the load is uniformly distributed over the span.
Abstract: An analysis is presented of the dynamic behavior and permanent deformation of a rigid-perfectly plastic beam subjected to blast-type loading. The beam is simply supported at the ends, and the load is uniformly distributed over the span. The anaylsis is based on an approximate yield curve relating limiting values of shear force and bending moment. Various patterns of deformation are found to occur with combination of plastic bending and shear sliding depending upon the load magnitude and beam characteristics. The effects of shear and of the shape of the load pulse are examined, and the paper is concluded with the results expressed in general terms for application to similar cases.
35 citations
01 Jan 1960
TL;DR: In this paper, a summary of recent experimental work to evaluate the assumptions of dynamic rigid-plastic theory is presented, and the experiments were performed on cantilever beam specimens of mild steel and of aluminum alloy, and tentatively indicate that strain rate effects are the principal cause of discrepancies between theory and experiments.
Abstract: A summary of recent experimental work to evaluate the assumptions of dynamic rigid-plastic theory is presented. The experiments were performed on cantilever beam specimens of mild steel and of aluminum alloy, and tentatively indicate that strain rate effects are the principal cause of discrepancies between theory and experiments. The need to consider the space and time variation of the yield moment in interpreting experimental results is shown, and a mathematical model that incorporates these features is discussed. In a numerical example the predictions of this model are found in excellent agreement with experimental results.
28 citations
TL;DR: In this article, a theoretical model based on the rigid, perfectly plastic material idealization is proposed to simulate the dynamic behavior of two deformable beams colliding with each other, and a deformation map in a governing parameter plane is constructed to permit the calculation of the energy partitioning for a range of the beams' parameters.
22 citations