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This work aims at characterizing the formation of cone-cracks in brittle materials upon spherical indentation. The cone-cracking is simulated by the extended finite element method (XFEM) in Abaqus / Standard. The element size-dependency is reduced by scaling the damage initiation strength based on mean stress criterion and calibration techniques. The formation of a kinked-cone-crack is observed when...
This paper proposes a partially recessed-gate structure which enables to enlarge HCI lifetime of an STI-based LDMOSFET without degrading important static performances such as breakdown voltage (BV) and specific on-resistance (Rsp). This improvement in HCI characteristic is observed regardless of channel types and voltage ratings. The recessed gate is formed in a field-plate region by dry-etching the...
Partial discharge diagnosis is an established instrument for the condition assessment of high voltage insulations and equipment. Under AC voltage stress the phase resolved pattern is of great significance in order to become aware of the type of fault. As a result of the inapplicability for DC voltage stress, approaches for alternative interpretation techniques such as the analysis of the pulse shape...
Solder is widely used in electronic packaging to connect die and substrate in die attach process. It is important to get a uniform solder distribution to provide good electrical conductivity, mechanical support as well as excellent thermal properties for packages, especially for power packages with high current densities. While nonuniform solder distribution would emerge when die moves and tilts in...
The advancement of Si and flip chip package technologies are driven by high performance mobile processors with high I/O counts. In Si, the back-end-of-line (BEOL) copper interconnect with extreme low-K (ELK) dielectrics has been used to lower RC latency. While for packages, fine-pitch Cu bump is introduced to meet the high I/O density. Corresponding assembly solutions such as thermal compression bonding...
This paper focuses the development of a three dimensional numerical model to simulate the behaviour of geocell reinforced sand using PLAXIS 3D. Numerical modeling of the geocell has been an immense challenge due to their curved shape. Most of researchers used equivalent composite approach (ECA) to model the geocells. However, the composite method has a number of limitations, including the disregard...
In early stage of the design process, modelling is a crucial phase because it allows the designer estimating the device performance before fabrication. Very often, this phase is performed with use of FEM simulator that is usually time consuming. In many cases, especially when simple structures are used, the use of analytical model is more convenient. In this paper we present an analytical model of...
This paper presents results of fracture tests on Multilayer Ceramic Capacitors (MLCCs). Fracture mechanical calculations were carried out with ANSYS in order to analyse the experimental values of fracture strength for the tested MLCCs. Subsequent metallographic analyses were used to get a precise picture of the origin and the propagation of the crack through the component.
This paper addresses principles of the attenuation of transient pore pressure, changes of effective stresses, and stress paths along the depth of saturated isotropic seabed subjected to four typical kinds of waves including linear waves, stokes waves, random waves and standing waves. Dynamic behaviors of saturated seabed soils with emphasis on the mechanisms of wave-soil interaction are investigated...
Meshfree Methods (MMs) have become popular as an alternative numerical simulation technique to handle problems of diverse engineering fields where conventional grid based methods are not suitable. Element Free Galerkin (EFG) method is a popular meshfree approach based on global weak form of governing differential equation and employs Moving Least Square (MLS) approximants to construct shape functions...
This paper presents a robust method of local deformation analysis of the heart's left ventricle (LV) aimed at specifying the affected area. Our method is based on regional curvature variation calculation using the Hotelling T2 two samples difference metric. It has been validated with real data obtained from myocardial scintigraphy imaging techniques of 44 patients. For each patient we extract 3D surfaces...
It is well documented that glucocorticoids are potent anti-inflammatory and immunosuppressive agents that are known to affect cell mediated inflammation by the inhibition of cellular proliferation and cytokine production. The literature is lacking knowledge in elucidating the mode of action of such agents on the transformed like cells in culture. Therefore, RAW (macrophage like) cells was selected...
Mission profiles for semiconductor applications are getting more and more challenging regarding electrical and thermo-mechanical robustness of metallization stacks. Effects, especially in thick metals, were investigated over the last years to find solutions for an improvement regarding both potential stressors. Some elements of a metallization were designed, investigated and simulated [1, 2, 3, 4...
To lightweight the engine connecting rod, and ensure it to meet the performance requirements, static equivalent load method was studied in the paper. Firstly, Connecting rod stress distribution was analyzed. Then, Multi-body dynamics model was established for the transient analysis, and connecting rod maximum stress was gotten when the engine working. Finally, Using equivalent static load method,...
Diaphragm Chamber is a critical component in fluid end of large scale diaphragm pump. Static strength failure and fatigue failure of diaphragm chamber are caused by high pressure of slurry flowing which is transported by diaphragm pump. It is necessary to analyze the inferences of different boundary shapes of diaphragm chamber on its static strength. In this paper, diaphragm chamber was simulated...
Reliability prediction profile is the diagrams of environmental parameters and time. It is used for simulation. It is in accordance with certain rules to deal with environmental reliability test profile. And it must reflect the actual stress situations. This paper studies temperature and vibration parameters of the profile, and determines its effect on the failure life of product. For the reliability...
We discuss here the estimation of lower percentiles by assuming a Weibull distribution. A log-transformation is made with the Weibull distribution to a smallest extreme value distribution. The location parameter of SEV is re-parameterized by a particular 100pth percentile and the scale parameter of the transformed distribution is assumed to be nonconstant. Statistical inference about the model parameters...
Physically based modeling is a novel theory for 3D printing, it can use a single material to control the physical properties, such as center of mass, total mass and moment of inertia. In this paper, we present a density variable shape modeling method to meet the required strength of 3D printed objects. We estimate a continuous density distribution that satisfies the detected stress distribution of...
The design, computational analysis, and experimental study of a modular flexure-based micro/nano manipulator is presented. The system combines a novel, compact, modular flexure-based mechanism with a haptic device, and a bilateral control architecture to enable rapid haptically-guided micromanipulation tasks. In principle the modular design allows manipulators to be constructed according to task-specific...
Facial Capturing cannot ensure the stable head and fix the head position as well as accurate camera distance. This variation degrades the face recognition accuracy. For improving the recognition a true estimator is required to cover the camera distance and the head movement impact. This paper presents a rubber characteristics transformation to generate manifold camera distance and facial shape mapping...
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