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Recently a nonlinear ultrasound method called Dynamic Acoustoelastic Testing (DAET), previously developed to detect cracks in solids, has been adapted to assess the nonlinear viscoelastic properties of fluids.
Displacement is a significant operator to solve spatial conflicts of road elements. At present, detection and adjustment of spatial conflicts are still in the manual stage, requiring a lot of manpower, resources and time. Therefore, it is urgently needed to study displacement operation thoroughly, whether for auto map production or the actual needs of mapping applications. Fortunately, structure mechanics...
The piezoelectric fiber composite actuators are new kind of piezoelectric actuators which have high mechanical performance and flexibility. In order to raise the induced strain of piezoelectric fiber composite actuators, two piezoelectric unit's construction equations about longitudinal length extension vibration mode are established. According to the construction equations for piezoelectric actuators,...
Based on the theoretical analysis about the morphology and the effect of crystallinity on the development of internal stresses for injection molded crystalline polymers, the internal stresses have been simulated by means of a new four elements viscoelastic mechanical model. Considering the crystalline orientation of injection molded parts, the parts are viewed as orthotropic solids to simulate the...
A multi-temperature-cycle wafer curvature experiment was performed in order to study the temperature dependent material properties of copper films. The specimen consists of 20μm copper film electrochemically deposited on a silicon wafer. Focused Ion Beam and Electron Back-Scatter Diffraction were used to characterize the microstructure of copper films. Wafer curvature (wafer bow) measurements were...
Dry high-speed cutting of spiral bevel gear is a non-linear dynamic process, involving partial high cutting temperature, high shear fracture, and high strain rate and so on. The accurate description of gear materials' mechanical characteristics in such physical environment is the foundation of dry high-speed cutting numerical simulation. But so far, no papers have been found in this regard. In this...
Piezoelectric fiber composites is one of the new type piezoelectric devices for actuators, since it has obvious anisotropy as well as high toughness that couldn't be gotten from normal piezoceramics. Piezoelectric fiber composites is denominated by piezoelectric fiber, polymer and interdigitated electrode layer. Through design processes, better mechanical and electrical characteristics than piezoceramic...
With the current trend of less expensive, faster, and better electronic products, it has become increasingly important to evaluate the IC package and system performance early in the design stage using simulation tools. For the solder joint subjected to cyclic stresses generated during the thermal cycling, its reliability depends on its resistance to creep and fatigue. The approach for simulation in...
This study considers multi-objective optimal design of the fiber reinforced symmetric-balanced laminated composites using genetic algorithms. MATLAB Genetic Algorithm and Direct Search Toolbox is used to obtain Pareto-optimal design for three different model problems. The objectives of the problems are to maximize the Young's moduli and minimize the coefficient of thermal expansion (CTE) simultaneously...
In-mold stress may occur for injection molded parts during the cooling stage. It not only affects the shrinkage of the part, but also has great influence on its mechanical properties. In this paper, stress-strain response was studied under the action of temperature and packing pressure in the process of injection molding. Furthermore, a new model was set to simulate the level of in-mold stresses in...
A novel stress-sensitive nanocomposite that can be used as flexible force sensors with tailored sensitivity was fabricated. The nanocomposite consists of MWNTs as conductive filler and SBS as polymer matrix. Some electrical and mechanical properties of MWNT/SBS films were measured. A typical percolation phenomenon was observed with the MWNT/SBS composites. The elastic modulus and Poisson's ratio of...
A model taking into accounts of mass conservation equation, kinetics of oxidation reaction, phase transformation has been proposed to describe the high temperature behavior of the oxidation layer of ZrB2-SiC composites along with Arrhenius law and Eshelbypsilas equivalent inclusion theorem. Volume fraction change of constituents and the elastic modulus of the depletion layer have been theoretically...
In this study, shear horizontal gap waves propagating in layered piezoelectric structures with initial stress is investigated analytically. The boundary conditions imply that the displacement, shear stress, electric potential, and electric displacement are continuous across the interface between the layer and the substrate. The electrically open conditions at the interface between the air and the...
Enterocutaneous fistulae are pathological communications between the intestinal lumen and the abdominal skin. Under surgery the mortality of this pathology is very high, therefore a vacuum applying system has been carried previously on attempting to close these fistulae. The objective of this article is the understanding of how these treatments might work through deterministic mathematical modelling...
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