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The marine environment, such as wind, wave and current, can have a significant effect in subsea production tree installation process and has brought difficulties and challenges. In this paper, in order to analyze riser stress and displacement in tis installation with different marine environments, the loads and boundary conditions at different installation stages are elected, and the installation...
This paper focuses on structure optimization of wedge-ring joint of underwater robot based on response surface method (RSM). Experiments for the combination of the 4 parameters of Unmanned Underwater Vehicle's (UUV) wedgering joint are designed in combination with central composite experimental method (CCD). FEA software ANSYS is used to get the respond data of structure stress and mass of wedge-ring...
Excavators used in mining industry have bucket teeth usually made up of hard alloys. In order to improve the anti-wear properties of these alloys coatings are provided. The purpose of the present work is to make the deformation analysis of the bucket teeth. It was observed that maximum stress occurred at the fixed joint of teeth and tongue, while the maximum wear takes place at the tip of tooth. The...
In many today's and future electronic and optoelectronic packaging systems (assemblies), including those intended for aerospace, automotive and other vehicular applications, the package (core), the assembly's inner component containing embedded active and passive devices and interconnects, is placed (sandwiched) between two insulated metal substrates (outer components), which, in an approximate stress...
An analytical stress model is developed for a short cylinder (beam) with clamped and offset ends. The offset is caused by an external lateral force that has to be determined from the known offset. It is envisioned that such a beam can adequately mimic the stresses and strains in a column of a column-grid-array (CGA) solder joint interconnection. Such an interconnection is characterized by an elevated...
Microelectronic devices continue to decrease in size, current features reached to 14 nm ARM processor, such as Exynos 7 octa in Samsung electronics. The semiconductor industry requires a deeper understanding of the physical processes involved in CMP to help attain smoother surfaces. In the CMP process, yield efficiency decreases by generating edge exclusion. And slurry cost may contribute to almost...
There is considering arbitrary force acting on the point of perfect homogeneous infinite crystal media in the paper. There is carried out analysis of the wave field forming in the nearest environs of the point application. Equations to determine angular distribution parameters of vibration energy emission (intensity and fluxes) for different states of polarization are presented.
This paper describes the test methodology, execution, and analysis of an accelerated life test (ALT) of a commercial door handle design (Fig. 1.). ALT is used to force failures to occur in less time by applying increased stresses to the component under test [1]. Testing was performed to calculate the predicted ten year reliability of the entire handle design.
Today's methodologies for electromigration (EM) identify EM-susceptible wires based on their current density, using the Blech criterion to filter out wires that are EM-immortal. The Blech criterion is agnostic to the product lifetime and temperature conditions: many Blech-mortal wires may never experience EM during the product lifetime. We develop new methods that evaluate the transient evolution...
This paper presents the simulation of cantilever beam using ANSYS for nano manipulator. Steel, Aluminum alloy and Polyethylene have been used for design of beam type structure. The structural analysis has been conducted by applying the force of 0.001 μΝ to 0.8 N. The length of beam has been varied from 80 μm, 120 μm, 160 μm, the width has varied 10 μm, 20 μm, 30 μm and the thickness has been 0.6 μm,...
The problem of plastic instability in sheet metal forming processes is considered. The mathematical model, which determines the limit strains under plane stress state as a function of parameters of crystallographic texture, is suggested. As an example, the influence of certain crystallographic orientations on plastic instability is shown.
The finite element based machining simulations have been used widely in industry and academia to analyze the machining process. These virtual machining simulations have advantages over the real machining experiments due to the immense potential of saving time and expenses. The simulation techniques are even more popular when machining difficult to cut materials such as titanium alloy (Ti6Al4V). In...
This paper aims to exploit technology in saving lives; a robotic arm is designed for EOD (Explosive Ordnance Disposal) applications that can rival the EOD robotic arms available in the market, in terms of both its capabilities and functionality, and still cost a small fraction of their price. Though there are many robotic arms that are commercially available, which can be used to handle different...
Rotor is one of the core component in flux switching machine (FSM) that wield mechanical stress. It is very important to identify the maximum tensile strength of the rotor. Beyond the maximum tensile strength, the rotor will deform or crack. In the research, stress analysis for the tensile strength is measured through principal stress. The stress analysis is conducted to analyze the principal stress...
A 2D simulation of thin die peeling from wafer tape is presented for a Multi Disc ejection system. The simulation models the dynamics of peeling, and visualizes time-dependency of peel front propagation and target die stress. It is based on a series of static snapshots, stringed together like a movie. A coupling of peel energy and peel velocity is defined. This allows to calculate the geometry of...
The bearing capacity detection of anchor bolt system is very important for the supporting effect evaluation. In this paper, back propagation neural network(BPNN) and genetic algorithm(GA) were used to predict the pull force of free bolt. Acoustic stress wave signals of free bolt were collected under different pull forces and analyzed in time domain and frequency domain. The wave velocity, fundamental...
A mesh-dependent relation for the slip number in the Navier-slip with friction boundary condition for computations of impinging droplets with sharp interface methods is proposed. The relation is obtained as a function of Reynolds number, Weber number and the mesh size. The proposed relation is validated for several test cases by comparing the numerically obtained wetting diameter with the experimental...
In this work, wire pull test combined with finite element analysis (FEA) were conducted to investigate failure mode and failure criterion for bond pad reliability assessment under Cu wire bond process. Pull test was conducted for bonded Cu wires with different pull locations changing from the first ball bond to the second wedge bond. Failure forces were recorded and failure site and modes were studied...
Copper (Cu) wire bonding technology is now widely held in mass production of semiconductor industry. The main benefit is cost advantage against Au wire and secondly enhance product performance and reliability. More new products are design in with Cu wire bonding and new wire bonding machine also equipped with Cu wire bonding capability. The market trend shows acceptance of Cu wire bonding products...
An analytical method is put forward to study the shrinkage and creep effects of concrete on widened T-beam bridge, important formulas are deduced to analyze the stress and deflection of the old and new T-beams, which are connected together to construct the widened bridge. Take a 20 m span widened bridge as an example, the height of the new Tbeams are analyzed specifically to disclose the law of the...
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