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wave propagation

ahmedettaf's picture

A new hybrid numerical scheme for modeling elastodynamics in unbounded media with near-source heterogeneities

The Finite Difference (FD) and the Spectral Boundary Integral (SBI) methods have been used extensively to model spontaneously propagating shear cracks in a variety of engineering and geophysical applications. In this paper, we propose a new modeling approach, in which these two methods are combined through consistent exchange of boundary tractions and displacements. Benefiting from the flexibility of FD and the efficiency of spectral boundary integral methods, the proposed hybrid scheme will solve a wide range of problems in a computationally efficient way.

Modeling finite number of mass/stiffness systems on an elastic media

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Hello, 
I have to model finite number of springs with point masses on a soil layer in Abaqus representing resonators. I tried to use Reference Points on the soil layer and some Reference point above the layer and connect them with Spring/Dashpots using connecting two nodes option, I chose Line of action for the spring, then I add stiffness. In the next step I applied Point mass as inertia to the reference points above the soil. 

Giorgio Carta's picture

Dispersion properties of vortex-type monatomic lattices

The paper presents a systematic study of dispersive waves in an elastic chiral lattice. Chirality is introduced through gyroscopes embedded into the junctions of a doubly periodic lattice. Bloch-Floquet waves are assumed to satisfy the quasi-periodicity conditions on the elementary cell.

wave propogation in with non local deformation

I have a one dimensional bar with a triangular pulse given at one end for 2 microseconds. The boundary conditions are free-free.I am having two cases. One in which the deformation is local (Hooke's law) and other in which the deformation is dependent on a kernel of radius r (say 5* element length).I find that the wave speed is higher when the deformation is non-local as compared to local deformation case. Is this correct? Is there a way to verify the solution?

aerturk's picture

Graduate Research Assistant (PhD student) position in ME @ Georgia Tech

We are seeking a motivated PhD student (only a student currently in the US for an immediate start) to work as a Graduate Research Assistant in our NSF project titled "Metamaterial-Enhanced Electroelastoacoustic Energy Harvesting for Sensor Systems." This computational and experimental project will investigate electroelastoacoustically coupled linear and nonlinear metamaterial-inspired piezoelectric energy harvesting concepts for self-powered sensor systems.

FEM Code for Wave Propagation Analysis

Hi every body,

I'm looking for a FEM code (Matlab, C++, Python,...) for analysis wave propagation in plates.

It would be the most kind of you to let me know how I can find it.

Regards,

 

Oleg Kirillov's picture

Nonconservative Stability Problems of Modern Physics

This monograph gives a complete overview on the subject of nonconservative stability from the modern point of view. Relevant mathematical concepts are presented, as well as rigorous stability results and numerous classical and contemporary examples from mechanics and physics.

Ji Wang's picture

Faculty Positions in School of Mechanical Engineering & Mechanics 宁波大学机械工程与力学学院招聘启事

The School of Mechanical Engineering and Mechanics, Ningbo University, is looking for cadidates for all subjects in the broad field of mechanical engineering and mechanics.  In addition to traditional field of impact and shock waves, piezoelectric devices, material durability, and metal forming, the school are also initiating new directions like vechicle engineering, fluid mechanics, occean engineering, and other related subjects.

Positions in ALL ranks are available.  Currently we are taking applications for 2014 school year.

Wave propagation simulation in elastic bar

Hi ,

 I'm working on simulation of wave propagation in a bar. I'm using
newmark time integration scheme to solve my problem. I have a bae
clamped at one end and under tensile at the other end. when I decrease
my time step ,at the beginning of the loading I see tiny negative
strains which is so weird. I used some numerical damping with the scheme
and I could reduce the time step but still I have this problem in
smaller time steps. Can anyone help me with this?

  Thank you very much!!!

Simulation of wave propagation in ABAQUS/CAE

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Hi, I am working on modeling wave propagation in ABAQUS/CAE.

I am not expert on ABAQUS and trying to figure out how it works.

I have a 2D Shell steel plate (1 centimeter by 1 centimeter) and try to obtain wave speed at any points of plate.

I put the material properties in and used ABAQUS/Explicit analysis.

Time steps are 1E-009 seconds and there are 2 steps (impulsed at the first step and propagates at the second step).

The load pluged at the amplitude with equaily spaced for 0.1 micro seconds (so it becomes impulse load).

Post Doc position at ETH Zurich in computational structural mechanics

The Laboratory of Thermodynamics in Emerging Technologies (LTNT) at ETH Zurich has an opening for a

Post Doc

Area
Computational structural mechanics with focus on soft tissues and wave propagation

Postdoctoral position with focus in ultrasonics

A postdoctoral position isavailable in the research group led by Dr. Joseph A. Turner in the Departmentof Engineering Mechanics at the University of Nebraska–Lincoln (UNL).

lamb wave simulation

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Hi,

 

     I am trying to simulate lamb wave propagation in steel plates using Ansys. I am completely new to this and would really appreciate any guidance with regards to examples or tutorials, speicifically for this problem. I know and am using the general tutorials out there. Thanks in advance for your help.

 

Haroon

Emilio P. Calius's picture

Research Positions in Modeling of Solids and Structures

Please see attachment for details of Computational Mechanics researcher openings at Industrial Research (www.irl.cri.nz), a Crown Research Institute in beautiful New Zealand.

The role involves the application of advanced modeling and simulation methods to research on solids and structures, with an emphasis on complex systems such as composites and meta-materials, or solids with multiple defects and discontinuities.

The position is research oriented but also provides opportunities to consult with industry on commercial projects.

Candidates with expertise in theory and computation of elastic wave propagation, the mechanical behavior of composites, structural dynamics, or acoustics are encouraged to apply.

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