Dynamics of elastic-plastic shear frames with secondary structures: shake table and numerical studies

2001 ◽  
Vol 30 (2) ◽  
pp. 257-277 ◽  
Author(s):  
Christoph Adam
Keyword(s):  
Secondary Structures ◽  
Shake Table ◽  
Plastic Shear ◽  
Elastic Plastic ◽  
Numerical Studies

Non-parametric shape design optimization of elastic-plastic shear panel dampers under cyclic loading

2019 ◽  
Vol 189 ◽  
pp. 48-61 ◽  
Author(s):  
Jin-Xing Shi ◽  
Sho Kozono ◽  
Masatoshi Shimoda ◽  
Masahiro Takino ◽  
Daiki Wada ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Design Optimization ◽  
Shape Design ◽  
Plastic Shear ◽  
Shape Design Optimization ◽  
Elastic Plastic ◽  
Shear Panel ◽  
Non Parametric

scholarly journals Electromagnetic Vibration Control of Secondary Structures

1997 ◽  
Author(s):  
A. Y. T. Leung ◽  
B. T. Sy
Keyword(s):  
Electric Current ◽  
Electromagnetic Force ◽  
Vibration Reduction ◽  
Secondary Structures ◽  
Earthquake Ground Motion ◽  
Shake Table ◽  
Euler Beam ◽  
Force Amplitude ◽  
Electromagnetic Vibration ◽  
Modal Damping

A new active controller for vibration reduction of secondary structures is studied. The secondary structure is exemplified by a steel Euler beam. The output electromagnetic force from an electric current whirling machine is used as controller force. The excitation is given by a shake table to represent earthquake ground motion. The effectiveness of the controller is examined by varying the phase angle and electromagnetic force amplitude of the electric current whirling machine. We quantify the effectiveness as equivalent added modal damping of the Euler beam.

A Coarse Model for the Multiaxial Elastic-Plastic Response of Ductile Porous Materials

2019 ◽  
Vol 86 (8) ◽  
Author(s):  
Andreas Schiffer ◽  
Panagiotis Zacharopoulos ◽  
Dennis Foo ◽  
Vito L. Tagarielli
Keyword(s):  
Mechanical Response ◽  
Hydrostatic Stress ◽  
Parent Material ◽  
Porous Solids ◽  
Plastic Response ◽  
Elastic Plastic ◽  
Numerical Studies ◽  
Coarse Model ◽  
Modeling Strategy ◽  
Good Agreement

We propose a modeling strategy to predict the mechanical response of porous solids to imposed multiaxial strain histories. A coarse representation of the microstructure of a porous material is obtained by subdividing a volume element into cubic cells by a regular tessellation; some of these cells are modeled as a plastically incompressible elastic-plastic solid, representing the parent material, while the remaining cells, representing the pores, are treated as a weak and soft compressible solid displaying densification behavior at large compressive strains. The evolution of homogenized deviatoric and hydrostatic stress is explored for different porosities by finite element simulations. The predictions are found in good agreement with previously published numerical studies in which the microstructural geometry was explicitly modeled.

The importance of shear in the yield criterion for the bending of slabs

1971 ◽  
Vol 6 (1) ◽  
pp. 13-19 ◽  
Author(s):  
R H Wood
Keyword(s):  
Boundary Conditions ◽  
Exact Solutions ◽  
Yield Criterion ◽  
Experimental Investigations ◽  
Plastic Shear ◽  
Rigid Plastic ◽  
Elastic Plastic ◽  
Simple Supports ◽  
Shear Strains ◽  
First Time

An impasse has arisen in present-day rigid-plastic theory for bending of slabs, in that exact solutions may not exist for certain combinations of shape, load, and boundary conditions. It is now shown, for the first time, that a complete elastic-plastic solution for a uniformly loaded square slab is unobtainable even with simple supports, in spite of the fact that an exact rigid-plastic solution is already well known. These discrepancies are traced to over-idealization of the yield criterion, in particular to the possibility of missing plastic-shear strains. The need for new experimental investigations is apparent, as well as for changes in the theory.

An elastic–plastic shear lag model for fracture of layered coatings

2003 ◽  
Vol 424 (2) ◽  
pp. 219-223 ◽  
Author(s):  
A.P McGuigan ◽  
G.A.D Briggs ◽  
V.M Burlakov ◽  
M Yanaka ◽  
Y Tsukahara
Keyword(s):  
Plastic Shear ◽  
Shear Lag ◽  
Elastic Plastic ◽  
Shear Lag Model ◽  
Layered Coatings ◽  
Lag Model

scholarly journals Numerical studies of cavitation erosion on an elastic–plastic material caused by shock-induced bubble collapse

2017 ◽  
Vol 473 (2205) ◽  
pp. 20170315 ◽  
Author(s):  
C. K. Turangan ◽  
G. J. Ball ◽  
A. R. Jamaluddin ◽  
T. G. Leighton
Keyword(s):  
High Speed ◽  
Plastic Material ◽  
Material Model ◽  
Solid Surfaces ◽  
Bubble Collapse ◽  
Liquid Jets ◽  
Elastic Plastic ◽  
Numerical Studies ◽  
Elastic Plastic Material ◽  
Bubble Sizes

We present a study of shock-induced collapse of single bubbles near/attached to an elastic–plastic solid using the free-Lagrange method, which forms the latest part of our shock-induced collapse studies. We simulated the collapse of 40 μm radius single bubbles near/attached to rigid and aluminium walls by a 60 MPa lithotripter shock for various scenarios based on bubble–wall separations, and the collapse of a 255 μm radius bubble attached to aluminium foil with a 65 MPa lithotripter shock. The coupling of the multi-phases, compressibility, axisymmetric geometry and elastic–plastic material model within a single solver has enabled us to examine the impingement of high-speed liquid jets from the shock-induced collapsing bubbles, which imposes an extreme compression in the aluminium that leads to pitting and plastic deformation. For certain scenarios, instead of the high-speed jet, a radially inwards flow along the aluminium surface contracts the bubble to produce a ‘mushroom shape’. This work provides methods for quantifying which parameters (e.g. bubble sizes and separations from the solid) might promote or inhibit erosion on solid surfaces.

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