The Experts below are selected from a list of 71076 Experts worldwide ranked by ideXlab platform
Raymond H. Plaut - One of the best experts on this subject based on the ideXlab platform.
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Snap-through of shallow reticulated domes under unilateral Displacement Control
International Journal of Solids and Structures, 2018Co-Authors: Raymond H. PlautAbstract:Abstract Snap-through instability of shallow reticulated (lattice) domes subjected to a quasi-static downward Displacement or force at a joint is analyzed. For the case of unilateral Displacement Control, the joint is pushed downward by an indentor until it snaps (jumps) to another equilibrium configuration, and then pushed further until another snap occurs, and so on. Under force Control, the magnitude of the force is increased, and a different sequence of snaps (local and then global) is exhibited. Green–Lagrange strain is assumed, as well as engineering strain for the smaller dome. The equilibrium equations are solved numerically using Mathematica. For force Control, snaps may occur on the equilibrium path (force versus Displacement at the force) at limit (maximum) points and at bifurcation points. For unilateral Displacement Control, snaps may occur at points where the associated downward force decreases to zero, at turning points (which have a vertical tangent), and at bifurcation points (if the bifurcating path moves downward at the loaded joint).
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snap through of arches and buckled beams under unilateral Displacement Control
International Journal of Solids and Structures, 2015Co-Authors: Raymond H. PlautAbstract:Abstract Arches and beams buckled upward are analyzed. The structure is pushed downward from above at a specific location along the span until snap-through occurs and the structure jumps to an inverted equilibrium shape. Each beam or arch is modeled as an inextensible elastica. Critical Displacements are computed for buckled beams with both ends pinned, both ends clamped, or one end clamped and the other end pinned. Circular arches with pinned ends are also investigated. The ends are immovable. The critical Displacement is obtained directly from a theoretical equilibrium shape of the initial unloaded structure. Numerical results are presented for four height-to-span ratios of the initial structure, showing the critical Displacement for any application point along the span. At the onset of snap-through, the imposed Displacement is at or below the horizontal chord connecting the ends.
E. Smith - One of the best experts on this subject based on the ideXlab platform.
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Displacement Control crack-growth instability in an elastic-softening material: Part III General analysis for a small softening zone
Journal of Materials Science, 1994Co-Authors: E. SmithAbstract:The paper formulates a general criterion for the Displacement Control instability of a crack in an elastic-softening solid, with attention being focused on the situation where the softening zone size is small in relation to the solid's characteristic dimension. The instability criterion is expressed in terms of the material's softening behaviour and the solid's geometrical parameters
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Displacement Control crack-growth instability in an elastic-softening material
Journal of Materials Science, 1993Co-Authors: E. SmithAbstract:The criterion for crack growth instability in an elastic-softening material that is subjected to Displacement Control loading conditions is examined. A theoretical analysis of the model of a solid containing two symmetrically situated deep cracks and with tensile loading of the remaining ligament, defines the criterion for crack growth instability. The criterion is expressed in terms of the material's softening characteristics and the solid's geometrical parameters. The analysis covers the complete spectrum of material behaviour from the case where the softening zone is very small to the case where instability does not occur until the softening zone traverses the ligament between the crack tips.
Yoshiaki Goto - One of the best experts on this subject based on the ideXlab platform.
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Effect of geometric non-linearity and Displacement Control on the overall accuracy of multi-directional pseudo-dynamic test
Fourth International Conference on Advances in Steel Structures, 2005Co-Authors: Makoto Obata, Yoshiaki GotoAbstract:Publisher Summary The chapter discusses the effects of geometric nonlinearity and Displacement Control on the overall accuracy of a multi-directional pseudo-dynamic test. Great progress has recently been made in the nonlinear numerical analysis that involves geometrical and material nonlinearity. The chapter examines the three-dimensional ultimate behaviors of steel structures under severe seismic waves. Recent computing power of hardware makes the nonlinear numerical analyses more powerful tools for seismic designs of structures. However, for all these successes, the reliability of these simulations heavily depends on various assumptions such as, boundary conditions, initial conditions, and material constitutive equations. Under these circumstances, although apparently contradictive, reliable and elaborate experiments have become important. A typical example that satisfies such requirement is a multi-directional pseudo-dynamic experiment. It is a quasi-static Displacement Control test that simulates a shaking table test.
L N Virgin - One of the best experts on this subject based on the ideXlab platform.
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coexisting equilibria and stability of a shallow arch unilateral Displacement Control experiments and theory
International Journal of Solids and Structures, 2015Co-Authors: P S Harvey, L N VirginAbstract:The equilibria and stability of a shallow prestressed arch (beam–column) are investigated theoretically and experimentally. The deflection of the arch is unilaterally constrained by a Displacement-Control device. Both snap-through and remote coexisting equilibria are observed. Force–deflection curves for primary and secondary equilibrium branches are measured for varying constraint locations. The effect of the constraint location on the critical condition at which stability is lost, resulting in a jump to a remote equilibrium, is investigated. Good agreement is attained between experimental data and theoretical results (based on minimization of the constrained strain energy and an inextensibility assumption).
Li Dong - One of the best experts on this subject based on the ideXlab platform.
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Test research of mental rubber elastic element based on Displacement Control
Ordnance Material Science and Engineering, 2005Co-Authors: Li DongAbstract:By the use of the precise Displacement Controlling of the material testing machine, static and dynamic tests of ring metal rubber elastic cells had been done, the result indicated that metal rubber material had obvious hysteresis nonlinear feature. High order elastic complex damp is constructed using hysteresis curve fitting decomposition. The model is constructed using a nonlinear combination of dynamic nonlinear stiffness and dynamic nonlinear complex damping mechanisms. The parameters in the model are identificated from the experimental hysteresis data. The force vs Displacement hysteresis curve are reconstructed using the model with these identificated parameters. The results show that the model captures the nonlinear vibration system behavior quite accurately and the proposed method is practicable for modeling of a nonlinear vibration system with hysteresis characteristics.
