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Study on electroelastic field concentration around the electrode tip in multilayer ferroelectric actuators

Submitted by Xujun Zhao on
research
Finite Element Method
Optimization
Piezoelectric/ferroelectric actuator
Electrode
Electromechanical concentration

Distribution of electromechanical field near electrode tips is closely related to the reliability of ferroelectric multilayer actuators. In this paper, the deformation and stress concentrations around the electrode tip in two multilayer actuator designs, partially and fully cofired, are investigated by means of experimental measurement and numerical simulations. The digital speckle correlation method (DSCM) is used to measure the full displacement field near the electrode tip with the high spatial resolution.

Membrane interactions control residues fluctuations of outer membrane porins

Submitted by Azim B Besya on
research

Bacterial outer membrane porins (Omp) that have robust ß-barrel structures, show potential ap-

plications for nanomedicine devices in synthetic membranes and single molecule detection biosensors.

Here, we explore the conformational dynamics of a set of 22 outer membrane porins, classified into

five major groups: general porins, specific porins, transport Omps, poreless Omps and composed

pores. Normal mode analysis, based on mechanical vibration theory and elastic network model, is

What is stress? Who has ever seen stress? Is stress a physical quantity?

Submitted by Yi-Heng Chen on
research
stress
strain
configurational forces
displacement
invariant integral
pseudo physical quantity

What is stress? Who has ever seen stress? Is stress a physical quantity?

Professor Yi-Heng Chen, Xi’an Jiaotong University, 710049, P.R.China

e-mail: yhchen2 [at] mail.xjtu.edu.cn (yhchen2[at]mail[dot]xjtu[dot]edu[dot]cn)

 

In fact, this question has been bothering the present author for more than 15 years.

Simulation ENF Specimen with Fibre Metal Laminates in ABAQUS

Submitted by DaniBa on
research

Hello everybody,i am trying to analyze a Fibre Metal Laminate ENF specimen for crack porpagation with ABAQUS. Therefore i am using the VCCT method. The model is running, but not with the expected outcome. The problem is that there is no crack propagation, as Mode II energy release rate is Zero. I really don't know why. I am using the "composite layup" function with continuum sheels and SC8R reduced integration continuum shell elements. To get an ENF specimen iam stacking this layup and model a frictionless contact between.

New perspective on Couple Stress theory resolving the indeterminacy issue

Submitted by Ali_Hadjesfandiari on
research
nanomechanics
Couple Stress tensor
Curvature tensor
Polar Continuum Mechanics

Dear fellow Mechanicians,We have done this research on couple stress theory which we believe has resolved the problem of indeterminacy in the spherical part of the couple-stress tensor and the appearance of the body couple in the constitutive relation for the force-stress tensor  (Mindlin and Tiersten, 1962).I humbly request you to read the paper and give me your feedback. I believe you would agree this is an important issue in Continuum Mechanics which can open up new frontiers.Sincerely,

Ali Reza Hadjesfandiari 

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