Time-Dependent Thermal Stress and Distortion Analysis During Additive Layer Manufacturing, by Powder Consolidation by Laser Heating
M.S. Yeoman, J. Sidhu
1. Continuum Blue Ltd., Tredomen Innovation & Technology Park, Tredomen, Ystrad Mynach, United Kingdom
BAE Systems, Advanced Technology Centre, Bristol, United Kingdom
A time-dependent COMSOL Multiphysics model of an additive manufacture process, which uses powder consolidation by laser heating was developed, providing a platform to better understanding the manufacture process & provide a tool to reduce resulting distortion & optimization of an additive manufacture process. The model simulates a high intense laser energy source moving along a pre-defined time ...
Computing the Influence Functions of an Adaptive Optics Large Deformable Mirror: the Numerical Method and the Experimental Data
R. Biasi, D. Gallieni, A. Riccardi, R. Briguglio, C. Del Vecchio
Microgate Srl, Bolzano, Italy
ADS International Srl, Valmadrera (LC), Italy
National Institute for Astrophysics - Arcetri Astrophysical Observatory - Firenze, Italy
Adaptive Optics units are mounted on many large telescopes, thus enabling diffraction-limited astronomical images through compensation of the effects of atmospheric turbulence. The design of the control system of the Deformable Mirror includes a feed-forward block, aimed for increasing the efficiency of the control loop. Such a block is based on the stiffness matrix of the DM, defined as the ...
A. Leggieri, D. Passi, F. di Paolo
Dipartimento di Ingegneria Elettronica, Università degli Studi di Roma Tor Vergata, Rome, Italy
This paper describes the Virtual Prototype of a Dielectric Window or High Power Microwave Vacuum Tubes and Linear Accelerators. Design formulas are provided and Computer Aided Design techniques based on COMSOL Multiphysics® software are proposed. The virtual prototype considers the Thermo-mechanical effects due to the joule effect induced by the power which crosses the DW and the Thermal contact ...
J. Bergstrom , N. Elabbasi ,
 Veryst Engineering, Needham, MA, USA
The use of thermoplastic materials is increasing and it is becoming more important during the design process to accurately represent the non-linear material response in relevant loading conditions. The COMSOL Multiphysics® software supports advanced modeling capabilities for large deformation analyses, including contact and multiphysics couplings. It is now also possible to use advanced non ...
J. Roche, P. Von Lockette, and S. Lofland
Mechanical Engineering Dept., Rowan University, Glassboro, NJ
Physics and Astronomy Dept., Rowan University, Glassboro, NJ
In this study, magneto-rheological elastomer (MRE) composite beams made of Barium hexaferrite (BaM) and Iron (Fe) powders combined with a highly-compliant matrix material were simulated using COMSOL\'s Solid Mechanics and AC/DC modules. The goal of the work was to develop models capable of predicting the actuation behavior of hard- and soft-magnetic MREs. This work simulates the bending of ...
Applied Superconductivity Center, National High Magnetic Field Laboratory, Tallahassee, FL, USA
High temperature superconductors (HTS) allow larger current densities through coil wound electromagnets, which produce higher magnetic fields. A high field HTS insert demonstration magnet is being built with high field homogeneity (~1 ppm) for application in nuclear magnetic resonance (NMR). The HTS NMR system is inserted into the bore of an existing high field magnet. A compensating Helmholtz ...
A. T. Galisultanov , P. Le Moal , V. Walter , G. Bourbon ,
 FEMTO-ST, Besanson, France
During last twenty years capacitive micromachined ultrasonic transducers (CMUT) have been developed extremely fast [1-2]. CMUT is an attractive alternative to traditional piezoelectric transducer, which converts electrical signal to mechanical vibration and vice versa. The main advantages of CMUT compared to most common solution: wide bandwidth (improved image resolution) and compatibility with ...
TRISO（TRistructure ISOtropic）燃料颗粒不仅是在役高温气冷堆燃料元件的核心部件，同时也是下一代用于水冷反应堆的全陶瓷微密封（FCM）耐事故燃料（ATF）元件的关键组成部分。TRISO燃料颗粒由内核部分和包覆层两部分组成，其中内核部分包括球形UO2或UN燃料核芯和包围核芯的疏松热解碳缓冲层，包覆层由内向外依次为内致密热解碳层（IPyC层）、碳化硅层（SiC层）和外致密热解碳层（OPyC层）。基于COMSOL Multiphysics®多物理场耦合有限元软件开发了TRISO燃料颗粒的三维热学-力学-裂变产物扩散耦合分析模型，详细考虑了材料物性参数随温度、快中子注量、各向异性系数和燃耗等因素的变化，热膨胀，燃料核芯的密实和肿胀，Buffer层、IPyC层和OPyC层辐照变形，SiC层、IPyC层和OPyC层辐照蠕变，Buffer层与IPyC层之间的间隙导热 ...
G. Maizza, and R. Cagliero
Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, Italy
Instrumented indentation is increasingly used as an alternative non-destructive test method to measure mechanical properties of small volumes of materials. In this work, the instrumented indentation test is applied as a non-destructive method to assess the mechanical properties of TiAl components during the setup of a real production process. This study is a preliminary contribution devoted to ...
Modeling and Simulation of High Sensitivity CMOS Pressure Sensor Using Free Boundary Circular Diaphragm Embedded on Ring Channel Shaped MOSFET - new
S. Joy, T. Tom
Rajagiri School of Engineering and Technology, Kochi, Kerala, India
Sensors have diverse applications ranging from the medical field to space exploration. They convert physical parameters such as temperature, pressure, humidity etc. into an electrical output. The discovery of piezoresistivity property of silicon and germanium led to miniaturization of pressure sensors. Improvement in the sensitivity is the major factor to be considered while designing pressure ...