A numerical method is described for studying how elastic waves interact with imperfect contacts such as fractures or glue layers existing between elastic solids. These contacts have been classicaly modeled by interfaces, using a simple rheological model consisting of a combination of normal and tangential linear springs and masses. The jump conditions satisfied by the elastic fields along the i...

Abstract In recent years, with navigation, aviation, chemical manufacturing, and automobile bodies increasing requirements for lightweight, high efficiency, energy saving, quality in the selection of materials manufacturing process are also improved. However, there is an unavoidable elastic deformation plastic bending panel veneer, accuracy workpiece impacted by spring back phenomenon, which ca...

The recently proposed concept of spring back reflectors has revolutionised the field of deployable antenna structures. The whole structure is made as a single piece from composite material, without any expensive and potentially unreliable joints, and it is simply folded elastically about a central axis, like a taco shell. Shape distortions occur during manufacturing and are difficult to correct...

in this study, thermo-mechanical nonlinear vibration of a polyethylene (pe) cylindrical shell embedded in an elastic foundation was investigated. the shell is reinforced by armchair carbon nanotubes (cnts) where characteristics of the equivalent composite being determined using mori-tanaka model. the elastic medium is simulated using the spring constant of the winkler-type,  . employing nonline...

Series elastic actuators have a spring intentionally placed at the actuator output. Measuring the spring strain gives an accurate measurement for closed-loop actuator force control. The low spring stiffness allows for high control gain while maintaining actuator stability. This gives series elastic actuators many desirable properties including high bandwidth at moderate force amplitudes, low ou...

In this paper, the typical U-shaped pieces were taken as the object of study and the finite element numerical simulation software Dynaform is applied to simulate the effect of sheet metal bending. The U-shaped bending spring back and its thickness change are analyzed. The influence law of main parameters of die structure to sheet thickness change and the spring back amount are obtained by combi...

In this talk we consider a free boundary problem describing a change of the length of a one-dimensional elastic material. By elementary calculation the free boundary problem is given as the initial boundary value problem for the hyperbolic equation with dynamic boundary condition. Moreover, as the practical example for the elastic material we deal with a new mathematical model for a valve made ...

Supplementary Method: How to Construct the Constraint Matrix Here, we provide the detailed procedure to construct the constraint matrix, because it is essential process in component mode synthesis that is employed in our coarse-graining method. For straightforward illustration, instead of considering complex structure such as protein structure, we restrict ourselves to one-dimensional spring sy...

Reich, T. E., S. L. Lindstedt, P. C. LaStayo, and D. J. Pierotti. Is the spring quality of muscle plastic? Am J Physiol Regulatory Integrative Comp Physiol 278: R1661– R1666, 2000.—During locomotion, major muscle groups are often activated cyclically. This alternate stretch-shorten pattern of activity could enable muscle to function as a spring, storing and recovering elastic recoil potential e...