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In this study, statistical aspects of fatigue crack growth life of base metal (BM), weld metal (WM) and heat affected zone (HAZ) in friction stir welded (FSWed) 7075–T651 aluminum alloy has been statistically analyzed by Weibull statistical analysis using our previous experimental data. The fatigue crack growth test were performed at room temperature on ASTM standard CT specimens under 3 different...
This paper describes the optimization methodology to mechanically reshape an antenna deformable reflector with a set of actuators in order to produce a desired contoured beam. The set of actuator commands for reshaping the reflector is determined by global optimization with Simulated Annealing. The optimization consists of minimizing the maximum stresses arising in the reflector structure when it...
Interconnect lifetimes due to electromigration (EM) failures are traditionally described by a modified Black equation [1] equation (1) where tf is the time to failure (TTF), A is a constant, j is the electrical current density, n is a fitting parameter which describes the impact of the current density, Ea is the fitted activation energy representing the failure mechanism, k is Boltzmann's constant,...
Tactile sensing is considered a key technology for implementing complex robot interaction tasks. The contribution of this article is two-fold: (i) we propose a general-purpose algorithm for the reconstruction of deformation and force distributions for capacitance-based skin-like systems; (ii) real-time performance can be tuned according to available computational resources, which leads to an any-time...
This study focuses on the development of a highly reliable solder bumping solution by the optimization of bump height and shape for flip-chip mounting of large die directly on PCB without the use of underfill. To achieve the goal, an elongated solder joint with an optimized shape has been developed that demonstrated far superior board-level thermo-mechanical reliability to that of the conventional...
The impact of gold nanoparticles to stress fibers (SFs) in HUVEC cells was studied by cutting the SFs from their mid-point with a femtosecond laser and recording their recoil dynamics in the real time.
The stochastic nature of dielectric breakdown in MG/HK and poly-Si/SiON technologies is investigated. The voltage ramp stress (VRS) methodology was employed to demonstrate that the variability of the Weibull shape parameter, β·(n+1), diminishes with increasing sample size as predicted for a purely stochastic process. However, the V63 confidence limits remain essentially the same and do not follow...
This paper proposes a design and control method for high-speed parallel robot. Improvement of several components of a robot is conducted from the previously designed prototype and thus better performance can be achieved. Stress analysis is conducted to improve the stability and reliability of the newly designed parallel robot.
The design of an ultrasonic cutting blade is presented in this study. The blade is designed as a cutting tool for orthopaedic surgery. It is tuned at a frequency of 35kHz and in the first longitudinal mode. Finite element analysis was carried out to investigate the blade dynamic parameters and its structural behaviour. Two prototypes of the design were manufactured and experimentally tested. This...
In this study, a novel piezoresistor (PZR) design to improve the sensitivity of the piezoresistive type pressure sensor is reported. In this design, the PZR combined with various doping concentrations and doping depths is proposed and implemented. According to the design concept, the combined PZR which includes multiple piezoresistance coefficients would be arranged in a unique shape, just like a...
The aim of this study was to check the load resistance factored design (LRFD) codes for Korean softwood species. Three representative structural timber Lazix Kaempferi, Pinus koraiensis, and Pinus densiflora, in the northeastern South Korea were selected. For evaluating the bending strength, a full-sized specimen was used. In the test results, it seemed that the KFRI grading rule was suitable for...
In biology, recent techniques in confocal microscopy have produced experimental data which highlights the importance of cellular dynamics in the evolution of biological shapes. Thus, to understand the mechanisms underlying the morphogenesis of multi-cellular organisms, we study this cellular dynamic system in terms of its properties: cell multiplication, cell migration, and apoptosis. Besides, understanding...
The samples of the pigeon surface were prepared as our research objective. The feature of the pigeon surface was analyzed by using the OLYMPUS stereo microscope and its image analysis system OLYCIATMM3. It was observed that the macro structure of pigeon body surface was non-smooth. Also, the drag reduction characteristic of the surface was resulted from the coupling effect of several factors. Based...
Because die-bonding mechanism is precision machinery, the high-speed bonding head must be meet designed displacement and the force must be kept within a certain range. In this paper, a 3D model of a bonding mechanism was designed and implemented within SolidWorks® software, and analyzed dynamically in ADAMS® software. Through the motion simulation to designed velocity, the displacement curve and the...
Crack of crankshaft and scuff of bearing have been the bottleneck for the development of large-scale reciprocating compressor. To solve such problems, modal and dynamic response analyses are performed for the crankshaft system. Torsional model shapes and stress status are obtained, which shows that the crack of original crankshaft results from fatigue damage and slight torsional vibration, and two...
Several percutaneous needle-based and intravascular procedures require guidance of the diagnostic or therapeutic tool to the target location by maneuvering the needle or catheter to correct for the error in reaching the target location. Hence, in this paper we present our work towards developing a discretely actuated steerable needle/cannula with multiple degrees-of-freedom to ‘steer’ the cannula...
A method to generate an appropriate path for manipulation of a belt object is proposed. It is important for automatic manipulation of a belt object such as a film/flexible circuit board to generate an appropriate path for a manipulator because such object is flexible in a certain direction but fragile in another direction and an inappropriate path which causes deformation in the fragile direction...
To improve the disassembly and recycling efficiency of waste electronic products, the research on active disassembly of product with shape memory materials has attracted people's attention. Cleaner Electronic Research of Brunel University's Joseph Chiodo, etc, conducted a series of active disassembly experimental and method studies for ADSM (Active disassembly using smart materials, ADSM) and applied...
Thin perforated plates are employed as structural members in many engineering applications. More specifically, in naval, marine and offshore structures these panels are used to make a way of access or to reduce the total weight of the structure. In several design situations these plates are subjected to axial forces. Besides, the presence of the perforation causes a change in the plate's mechanical...
This paper investigates the recent developments on switched-capacitor converters for high power applications. Based on an analysis on the shape of capacitor charging current for switched-capacitor converters, technologies used to improve the efficiency and reduce the Electromagnetic Interference (EMI), including the soft-switching and interleaving scheme, are discussed. Several existing topologies...
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