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Take the most widely used linear cylinder as research object, use the quality-alterable air's thermodynamics establish the mathematical model of cylinder impact process. Obtain the parameters of the pressure in rod chamber and rodless chamber through solving the differential equations in Simulink. Then simulate the cylinder impact process in Transient dynamic module of ANSYS. The simulation boundary...
We deal with the 1D non-stationary wave propagation in an elastic phase-transforming bar. The stress in the bar σ is assumed to be a piecewise linear function of the strain ε containing a “negative slope segment,” thus, the strain energy is a non-convex function of the strain. It is known that the problem of elastostatics for such a material can have solutions with discontinuous deformation gradients...
Smart or multi-functional materials are receiving more and more attention in the last decade, due to their strong potentialities to provide new and remarkable functionalities.
An accurate understanding of oxide traps is essential for a number of reliability issues, including the bias temperature instability, hot carrier degradation, time-dependent dielectric breakdown, random telegraph and 1/f noise. Recent results have demonstrated that hole capture and emission into oxide traps in pMOS transistors are more complicated than the usually assumed Shockley-Read-Hall-like process...
For gaining effective influence radius of heat injection mine for CBM (Coal Bed Methane) and influence rules of permeability under the condition of temperature and effective stress, heat transfer and elastic mechanics theory combined, hooker law of thermal elastic body introduced, mathematical model of thermal-solid coupling to coal-rock was set up, The weak solution of temperature field and transformation...
The work attempts to investigate the thermal-mechanical behaviors of an advanced flexible electronics technology during the bonding process and under four-point bending (FPB) and static bending (SB). The flexible technology implements an epoxy-based anisotropic conductive film (ACF) to form fine-pitch and reliable interconnects of Integrated circuits (IC) bumps on flex substrates. The paper starts...
With two groups of internal state variables and their correlative intrinsic time, a new constitutive equation for rheologic characteristics of soil was developed based on thermodynamic theory and endochronic theory. Numerical solution of the constitutive equation under axial symmetry condition was obtained by optimization. The new intrinsic constitutive equation does very well in simulating the essential...
High temperature flow-rate control valve is a key component to control the flow rate of fuel supply for aerospace engines. A high temperature fuel flow-rate control valve, pilot-controlled by a high pressure pneumatic system, is developed in this paper. The construction and working principle of the valve are introduced. The thermodynamic mathematical models of the valve are built and the thermodynamic...
The localized heating produced by a tightly focused infrared laser leads to surface tension gradients at the interface of microfluidic drops, resulting in a net force on the drop whose origin and magnitude are the focus of this paper. First, by co-localization of the surfactant micelles with a fluorescent dye, we demonstrate that the heating alters their spatial distribution, driving the interface...
In this work the flow behavior in the channel formed in the knee articulation is analyzed using Reynolds' equation. The comparison between natural and prosthetic knee is achieved through the evaluation of the corresponding friction coefficients which are added to the Reynold's equation. The friction coefficients are determined by relating them to the surface roughness, shear stresses, contact angles,...
A thermodynamics-based damage mechanics rate dependent constitutive model is used to simulate experiments conducted on thin layer eutectic SnAgCu(SAC) solder joints. The non-damage constitutive is measured by bulk tensile test. The relationship between true stress and strain is sigma=85.26epsiv0.3536. Damage evolution equation is proposed based Lemaitre ductile damage theory and the constant in the...
Functional electrical stimulation (FES) when interfaced with a reciprocating gait orthosis (RGO) resulted in walking exercise for a C-7-level quadriplegic subject. Cardiopulmonary measurements were made and efficiencies calculated on the subjects during progressive velocity walking with the FES-RGO and the RGO alone (without FES). Results for the quadriplegic individual indicates that overall external...
The influence of an electric field on unsteady convective diffusion in coupled-stress flow is studied using a time-dependent dispersion model. The electric field is shown to increase the axial dispersion coefficient, which is useful in the control of hemolysis caused by implanted or extracorporeal artificial organs. The contribution of pure convection in the dispersion of concentration is singled...
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