Full 3D FEM Simulation of Thickness Shear Bulk Acoustic Resonators on LN Assisted by Hierarchical Cascading Technique

Computational simulation has become more important in the design of thermomechanical processing since it allows the optimization of associated parameters such as temperature, stresses, strains and phase transformations. This work presents the results of the three-dimensional Finite Element Method (FEM) simulation of the hot rolling process of a medium Mn steel using DEFORM-3D software. Temperature and effective strain distribution in the surface and center of the sheet were analyzed for different rolling passes; also the change in damage factor was evaluated. According to the hot rolling simulation results, experimental hot rolling parameters were established in order to obtain the desired microstructure avoiding the presence of ferrite precipitation during the process. The microstructural characterization of the hot rolled steel was carried out using optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that the phases present in the steel after hot rolling are austenite and α′-martensite. Additionally, to understand the mechanical behavior, tensile tests were performed and concluded that this new steel can be catalogued in the third automotive generation.

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3D-FEM simulation model of the Earth-ionosphere cavity

Journal of Electromagnetic Waves and Applications ◽

10.1080/09205071.2019.1575289 ◽

2019 ◽

Vol 33 (6) ◽

pp. 734-742 ◽

Cited By ~ 2

Author(s):

E. S. Goncharov ◽

A. N. Lyakhov ◽

T. V. Loseva

Keyword(s):

Simulation Model ◽

Fem Simulation ◽

3D Fem ◽

The Earth

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Transverse Mode Suppression of Thickness Shear Bulk Acoustic Resonators on Lithium Niobate Using Standard and Broadband Piston Mode Designs

10.1109/ius52206.2021.9593452 ◽

2021 ◽

Author(s):

Ting Wu ◽

Yu-Po Wong ◽

Yiwen He ◽

Chuan Peng ◽

Jingfu Bao ◽

...

Keyword(s):

Lithium Niobate ◽

Transverse Mode ◽

Acoustic Resonators ◽

Mode Suppression ◽

Piston Mode ◽

Thickness Shear

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Seam Welds Modeling and Mechanical Properties Prediction in the Extrusion of AA6082 Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.367.125 ◽

2008 ◽

Vol 367 ◽

pp. 125-136 ◽

Cited By ~ 16

Author(s):

Lorenzo Donati ◽

Luca Tomesani

Keyword(s):

Mechanical Properties ◽

High Speed ◽

Fem Simulation ◽

Die Design ◽

Welding Parameters ◽

Middle Section ◽

3D Fem ◽

Strain And Strain Rate ◽

Mechanical Properties Prediction ◽

Temperature Time

This work summarizes the outcome of recent research by the authors on modeling the formation of seam welds in aluminum extrusion and on evaluating the related mechanical properties on the final products. A profile with a seam weld in the middle section was produced with different die designs in order to investigate the relation between die design and local welding parameters, such as contact pressure, temperature, time of contact, strain and strain rate paths. The local welding conditions were evaluated by complete thermo-mechanical 3D FEM simulation of the processes. Specimens were extracted from the profiles and tensile tested, the resulting mechanical properties being discussed with respect to the local welding conditions. The possibility to adopt criteria for assessing the welding quality is discussed, together with the effect of high speed damage cracking.

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Spurious free thickness shear bulk acoustic resonators on lithium niobate using standard and broadband piston mode designs

Japanese Journal of Applied Physics ◽

10.35848/1347-4065/ac42ae ◽

2021 ◽

Author(s):

Ting Wu ◽

Yu-Po Wong ◽

Yiwen He ◽

Chuan Peng ◽

Jing-Fu Bao ◽

...

Keyword(s):

Lithium Niobate ◽

Transverse Mode ◽

Complete Suppression ◽

Two Dimensional ◽

Mode Structure ◽

Acoustic Resonators ◽

Mode Design ◽

Dimensional Finite Element ◽

Piston Mode ◽

Thickness Shear

Abstract This paper describes design and fabrication of sprious-free thickness shear bulk acoustic resonators (TSBARs) using the lithium niobate (LN) plate. Previously, the authors conjected from the experiment on the TSBAR that cutoff edges with crystal LN X-plane serve as ideal reflectors for the piston mode operation, and complete suppression is possible by adding the standard piston mode design to the other edges normal to the X-axis. Following to this conjecture, the traditional piston mode structure is designed by the traditional two-dimensional finite element method, and the TSBAR is fabricated following to the design. The experiment showed complete suppression of the transverse mode resonances, and the conjecture was verified.

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