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Stress in flip-chip (FC) packaging process will have a great effect on the performances and reliability of the packaged devices, especially the mechanical parts. Flip chips with various bump-area-arrays have diverse stress distributions due to temperature loads. Since the top surface of the chip is not exposed to optical observation, the traditional full-field optical measurement techniques are not...
General profiles chosen from worn wheel profiles and railheads (briefly, worn wheel and rail profile) measured by wheel-rail profile admeasuring apparatus were used to build the finite element models, and the new/worn wheel-rail contact problems were analyzed respectively on the tangent and curved track. Variable regulations of contact area's size, shape and position were generalized. The results...
The deformation of a TVM's body frame was calculated and the structural FEA (Finite Element Analysis) was accomplished in this paper. The geometric model and finite element model of TVM (Ticket Vending Machine) were built. To locate the maximum stress and displacement precisely, structural analysis of the TVM's body frame under its gravity was analyzed by FEA software. The results indicate that the...
Failure happens when test carried on one kind of coach seat recliner, such as: gears of locking board were broken, plastic deformation takes place on end of fixing base. A finite element model was set up and numerical simulation was carried on under boundary conditions which are the same with experiment. Results show that the maximum stress occurred at the dedendum of the first gear of locking board,...
A custom, patient-specific unicompartmental knee replacement was developed using a unsupervised neural network trained on a database of healthy knee geometries. This custom implant was then compared to a conventional implant in terms of contact stress in a Finite Element Model. The custom implant experienced lower contact stresses at the tibiofemoral joint compared to the conventional implant. The...
First, the seal reliability function of the O-ring, that is the maximum contact stress between O-ring and plunger must be greater than the fluid pressure, is established, then on the basis of the nonlinear constitutive equation Mooney-Rivlin of rubber material, the finite element model of the O-ring is built using commercial software ABAQUS, according to the finite element model, the distribution...
A finite element model of the suspension structure of 9000 kN self-walking transporter was established, and the distribution of stress was simulated and calculated in order to determine the position of the dangerous point. Based on the actual working conditions and the results of FEM analysis, the reliability test of the suspension structure was done. The results of test are in good agreement with...
Bit-pattern media is a promising approach for further increasing the recording density of future magnetic disk drives. Also, future high density recording requires further reduction of the magnetic spacing between head-slider and disk-media. As a result, the chance of slider-disk contact will be increased and the stress caused by such contact becomes an important issue for future disk drives. This...
The effect of thinning down the chip thickness, will affect the stress pattern in the chip and causes the chip to deform locally when the thickness of the chip is thinner than a certain critical value. Such a local deformation may cause sharp gradient of residual stress around the solder bumps and thus, various failures. This paper shows that by considering the effect of solder bumps on a 50 mum chip,...
A finite element modeling scheme to analyze the combined effect of thermal and hygroscopic deformation is presented. The scheme employs the conventional moisture diffusion and heat transfer analysis capabilities available in the commercial FEM packages, but a new formulation is introduced to allow the time-dependent non-linear analysis of package deformations induced by hygroscopic as well as thermal...
For children with cleft palate, oral function is impaired. The hypothesis is that the stress and strain distribution within the affected maxilla with a cleft during functional tasks such as biting and chewing is abnormal and can significantly affect bone development in the growing child. To test this hypothesis, a three-dimensional finite element model of a pediatric subject-specific maxilla with...
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