Solving the Inverse Problem of Resonant Ultrasound Spectroscopy on Dumbbell-shaped Compression Samples Using COMSOL Multiphysics®
M. C. Golt
U.S. Army Research Laboratory*, Aberdeen Proving Ground, MD, USA
*Contracted through Dynamic Science, Inc.
The dumbbell geometry is an ideal shape for testing the compressive strength of advanced ceramic materials. This paper details the combined use of COMSOL Multiphysics® and LiveLink™ for MATLAB® for determining the elastic properties of dumbbell-shaped samples by measuring their acoustic resonance frequencies. Degenerate bending modes which are sensitive to inhomogeneities or machining defects ...
S. Kadam, A. K. Datta
Department of Biological & Environmental Engineering, Cornell University, Ithaca, NY, USA
Turgor pressure loss and pectin degradation result in texture loss during cooking of plant based materials. To simulate texture loss, a simultaneous heat and moisture transfer, pectin degradation in the cell wall material and solid mechanical model was developed at the microscale using finite elements to predict the homogenized Young’s Modulus of the carrot tissue during heating. The model ...
D. Jauffrès , J. M. Dedulle , D. Chaussende , K. Ariyawong 
 Univ. Grenoble Alpes, LMGP, SIMAP, CNRS, Grenoble, France
 Univ. Grenoble Alpes, LMGP, CNRS, Grenoble, France
During Physical Vapor Transport (PVT) growth of single 4H-SiC crystal and subsequent cooling down, thermal stresses lead to the multiplication of dislocations that are non-desirable for the semiconductor applications of this material. These dislocations induced by thermal stresses could be reduced by an appropriate control of the thermal gradients inside du crystal during its growth and cooling ...
Boopathi S, Ms.E.Malar, Deepan Chakravarthi P
Department of Biomedical Engineering, PSG College of Technology, Coimbatore, Tamil Nadu, India
This paper deals with an integrated numerical and experimental analysis work aiming at the investigation of the thermal stress on nanowires in electronic gadgets especially computers and mobile phones. The comparative study of the nanowires are analyzed through the Thermal Stress physics using different variants such as Cu, Al, ZnO, Si(c), SiO2 which can be used in sensors, solar cells, LCD, ...
Y. Xin, A. Purniawan, L. Pakula, G. Pandraud, P. J. French
Technology University of Delft, Delft, Netherlands
This paper presents a freestanding waveguide to achieve the goal of detecting anastomosis leakage after colon surgery. The freestanding part is a thin membrane consisting of TiO2 rib and SiN ridge. This freestanding waveguide is designed both mechanically and optically to maintain mechanical stability during fabrication and detection process, and at the same time guarantee the detection ...
C. Hollenbeck , Z. Jildeh , T. Rydlewski , P. Kirchner ,
 Imagine Engineering GmbH, Bergheim, Germany
Due to the advantages of induction heating as a method for precise and efficient local heating, it is perfectly suited for thermal shrink fitting of a gear wheel on a shaft. In this work, a simulation model was established to study the induction heating of a gear wheel, its thermal expansion as well as the shrink fitting process. It was possible to find an appropriate geometry for the induction ...
陆晓 , 温周斌 , 徐楚林 , 岳磊 ,
扬声器仿真分析方法越来越受到电声企业关注，已成为扬声器设计的重要手段和发展方向。要想设计中高端扬声器，就必须建立一套完整的仿真分析方法。 本文介绍一种基于 COMSOL Multiphysics® 的用于中高端扬声器设计的仿真分析方法。该方法不仅包含了扬声器磁路、振动系统（结构）和声场的耦合分析，还模拟了温度对磁性材料和振动部件材料特性的影响。由于扬声器振动部件材料的粘弹性等特性，因此必须建立更为准确的材料模型。利用 COMSOL Multiphisics 软件丰富的第三方软件接口和二次开发功能，经数据后处理可得到声障板等条件下的声压级、谐波失真和互调失真等。 采用本方法可有效指导中高端扬声器的仿真设计，准确预估扬声器的声压级、谐波失真和温度场等关键指标，对扬声器产品的理解和设计水平亦将达到新的高度。
K. Kryniski , A. Trangard ,
 ABB Corporate Research, Västerås, Sweden
In addition to using advanced functions built-into the engine of the COMSOL Multiphysics® software, we integrate dynamic properties of rotating components that are measured or pre-computed. Here, it is shown how to integrate fluid-film characteristics and take advantage of post-processing and graphics to present the results to the customers using the Cloud. COMSOL® simulations of rotor-bearing ...
S. Saha, A. Ramirez, C. DiBiasio, M. Culpepper
Massachusetts Institute of Technology, Cambridge, MA, USA
Charles Stark Draper Laboratory Inc., Cambridge, MA, USA
Introduction: Flexures are low-cost bearings that are capable of providing motion guidance with high repeatability and low friction (Figure 1). However, applications of flexure bearings are often limited by their low range. This is because motion guidance in flexures is provided by bending/flexing of members; thus, range is limited by the bending stiffness. As the bending stiffness can be ...
D. Malomo , V. Varano ,
 DICEA, University of Rome, Italy
 LAMS, University of Rome, Italy
The "Lithic Hypar" research is based on the mechanical analysis of an innovative reinforced stone's structure, architecturally designed by Prof. Fallacara, University of Bari (Italy): the headquarters entrance portal of the French company SNBR (Société Nouvelle Batiment Régional) located in Troyes (France), the realization of which is planned for October 2015. The main idea of this lithic ...