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This work investigates structure analysis and design of metal interconnects for stretchable electronic circuits using the finite element software ABAQUS. In order to design a more promising structure of metal interconnect, the performance of different parameters (the inner radius, the angle and the width of the copper trace) of horseshoe shape is compared under the condition of uniaxial tensile. In...
It is very essential that a structure must be run without defects because existence of a defect affects the service life of the structure in harmful way. So, it is important to understand the dynamic behaviour of the structure. Crack changes dynamic performance of the structure and observing this change, the crack depth size and position of crack can be predicted. Non-destructive testing (NDT) methods...
3-D finite element models of SOP (Small Outline Package) were constructed, in which Anand visco-plasticity constitutive equation was used to describe the mechanic behavior of solder joint. The solder joint deformation and stress distribution with five kinds of lead shapes were researched. The experimental program for the identification of numeri3cal simulation was performed with three kinds of lead...
A large number of stroke-surviving individuals exhibit deficits related to upper limb movement, thereby making post stroke rehabilitation a critical part of patients' health care system. The patients are typically treated with conventional occupational therapy at the hospital after stroke. However, due to economic pressures and limited health care resources often the patients receive less therapy...
According to the problem of bionic shark gill jet fluid was able to reduce fluid friction on jet surface, bionic jet surface models were built, which each has different jet hole shape, such as rectangle, arrow-shaped, broken line and other shapes. Models were numerically simulated by using the turbulence model of SST k-ω. The results show that: jet hole of broken line shape has the best...
A typical constrained mixed-integer nonlinear program: truss sizing and shape optimization under multi-loading cases and complex constraints is investigated in this work. A laconic adaptive penalty function is employed to handle the structural stress and local buckling constraints. The Covariance Matrix Adaptation Evolution Strategy (CMA-ES) is adopted to update the structural design variables. The...
The analytical solution of a plane problem for a bimaterial plane with a crack in the shape of the circular arc located near an interface is obtained. On the crack edges external load is applied. At infinity stresses and angles of rotation are given. Method of complex potentials of Kolosov — Muskhelishvili together with a superposition method is used for solving the problem. The boundary problem is...
Warpage of packaging substrate has been at issue due to thin and flexible substrate. It is occurred during manufacturing processes. Although warpage research based on thin metal film and silicon substrate was actively studied, it has difficulty about research of polymer based electronic due to its flexibility and low stiffness compared to metal and silicon substrate. We suggest a new methodology of...
Thinner organic BGA packages typically lead to higher warpage before surface mount which, after reflow, causes package corner solder joints (SJ) to have higher stand-off compared to solder joints in the package center. Hence the solder joints at package corners can change from typical barrel shape to an elongated hour-glass shape. Conventional understanding of the impact of SJ height on temperature...
Two groups of subjects (21 healthy, 21 hypertensive patients) were tested during two measurement protocols (exercise, tilt). Two models of QT-RR coupling were tested — linear (LM) and nonlinear (NLM). QTc reproducibility was used as evidence of model validity. Results: LM was significantly better (lower QTc irreproducibility) than NLM (P<0.01) during the tilt-table test. The differences were not...
3-D finite element models of SOP (Small Outline Package) were constructed, in which Anand visco-plasticity constitutive equation was used to describe the mechanic behavior of solder joint. The solder joint deformation and stress distribution with five kinds of lead shapes were researched. The experimental program for the identification of numeri3cal simulation was performed with three kinds of lead...
This work investigates structure analysis and design of metal interconnects for stretchable electronic circuits using the finite element software ABAQUS. In order to design a more promising structure of metal interconnect, the performance of different parameters (the inner radius, the angle and the width of the copper trace) of horseshoe shape is compared under the condition of uniaxial tensile. In...
As the use of ACFs increased in various areas of electronic packaging such as semiconductors and flexible devices, demands for highly reliable ACFs have been also increased. For this demand, solder ACFs which use solder particles as conductive particles were introduced. In the solder ACF bonding, the solder ACF joint morphology should be controlled because the failures of solder ACF joints by crack...
We propose a planning method for a gripper grasping daily life objects using quadric surface approximation. This method can decompose the objects to the approximate quadric surfaces. The planner can find regions for contacting fingers quickly so that the gripper grasps the object firmly. The planner evaluates the grasp stability for these postures. The previous evaluation method in surface contact...
The mole is an axially symmetric intrusion device, which can be treated as a carrier of different sensors that investigate the subsurface environment and properties of the material component. To some extent, the maximum penetration depth of a single stroke for hammer-driven mole is not only limited by the stroke energy but also the influence of the soil resistance which links to the shape of the front...
In this paper, we present the effects of diaphragm design parameters on the sensitivity of acoustic sensor used for condition monitoring purpose. We have considered different design parameters of the diaphragm such as shape, dimensions, thickness, type of the piezoelectric material of the diaphragm. We studied the effect of changes in these parameters on the deflection, stress, strain, voltage generated...
This paper describes how remote and virtual laboratories can support students in material properties study. The structure of the course and division of the study materials are described. The educational environment used for virtual and remote laboratories is presented.
In the field of the micro/nano operations, like micro, assembly engineering, biological engineering, ultraprecision machining and military needed precision operation and control , we need to use with micron, sub-micron or even nanometer resolution of micromanipulator. Micro positioning platform is an important carrier of precision positioning technology. The purpose of this paper is to design a flexible...
Accelerated life testing (ALT) can be utilized to shorten the test duration for demonstrating the high reliability target with a long mission time under the use condition in reliability demonstration test (RDT). In this paper, a reliability acceptance sampling plan (RASP) for Weibull distribution with a nonconstant shape parameter under the acceleration condition is designed to demonstrate the reliability...
To optimize structure and enhance energy-generation capability of monocrystal piezoelectric generator under specific working environment, a analysis model of energy conversion is established. The piezoelectric generator is optimized for different forms of vibration in two-dimensional. For shock style, Design optimization should improve the stress distribution of piezoelectric transducer under the...
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