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initial particle distribution in SPH

I wonder how important the initial set up for a Smoothed Particle Hydrodynamics simulation is. Is the initial particle distribution somehow significant for the final result? How to control particle density and distribution along problem domain? What are the important factors inherent to the initial set up? Having control over the initial set up is going against the philosophy of this method?

 

J integral estimation in ABAQUS

Dear all,

I am a Ph.D student. I am trying to calculate the value of the j-integral for a 3D penny shaped crack embeddee in a continuum linear elastic solid using ABAQUS.

the first difficulty that I have met is that j-integral values are negative forr some nodes along the crack front.

I am pretty sure that the value of the normal to the crack front that I have used is correct.

 Do you know some other reason for that?

Mechanical Engineering Technology: Clean Energy And Linear Motion Mechanism

You can see two sliders. I apply force using one slider to another slider. Best part is one slider move little bit

and helps second slider

to slide 6 times length at 70 % force.

For More information please visit http://mechanicalresearch.info/

 

ESIS's picture

Discussion of fracture paper #9 - Crack tip modelling

Dear Reader, 

I recently took over as the ESIS blog editor. Being the second in this baton relay, I will do my best to live up to the good reader expectations that has been established by my precursor, who is also one of the instigators of the blog, Wolfgang Brock. 

Vectorial rapresentaton of State Variable in ABAQUS

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Hello,

 

I qould like to represent a State Variable of my Abaqus UMAT with a vector field. Is it possible to do that? How do I proceed?

Thank you in advance!

Regars,

Mattia, UCSB

USDFLD subroutine

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Hi all,

I am new to ABAQUS. I need to write a subroutine for thermal gradient in USDFLD. But I am not able to do that. Can anyone help me to do that.

 

Thanks in advance

Prashant Saxena's picture

Theoretical study of magneto-rheological elastomers

I post the links to some of our recently published papers on magneto-elasticity. These are iron-filled elastomers whose mechanical properties can be influenced by the application of a magnetic field. A continuum theory that accounts for magneto-mechanical coupling as well as rate-dependent energy dissipating deformations is presented.

I also attach post-print versions of these articles here. Hopefully, they can be useful for some people working in this field.

Jeong-Yun Sun's picture

Ionic Skin

Research paper.

Title:  Ionic Skin

 

Authors: J.-Y. Sun, C. Keplinger, G.M. Whitesides, Z. Suo

 

Case Studies in Engineering: watch the video

Whatch our video http://www.youtube.com/watch?v=6FpxQrvpU4g

What are case studies?

Case Studies in Engineering are a series of open access journals, which publish practical outcome of research and indusrty projects in a variety of Engineering disciplines, including: Construction Materials, Fire Safety, Structural Engineering, Engineering Failure Analysis, Mechanical Systems and Signal Processing, Nondestructive Testing Evaluation and Thermal Engineering.

Payam Soltani's picture

Piezoelectric vibration damping using resonant shunt circuits: an exact solution

Piezoelectric vibration damping using resonant shunt circuits: an exact solution

By:

Payam Soltani, Gaetan  Kerschen, Gilles  Tondreau and Arnaud Deraemaeker

Abstract

determination of stiffness matrix of transversely isotropic material

Dear all, I am an applied mathematician and I  have been stucked by the this general question for a while, i.e.,  to determine the stiffness matrix of transversely isotropic material from known strain and stress tensors.  The definition of transversely isotropic tells us that the stiffness matrix can be defined by 5 constants, see attached figure. C44 is easy to determine, so we can focus on the remaining 4 constants. I attempted to establish 4 linear equations for these 4 constants with the known strain and stress components.

Lihua Jin's picture

Ridge localizations and networks in thin films compressed by incremental release of large equi-biaxial substrate pre-stretch

Atsushi Takei, Lihua Jin, John W Hutchinson, Hiroyuki Fujita, Ridge localizations and networks in thin films compressed by incremental release of large equi-biaxial substrate pre-stretch, Advanced Materials, 2014, 26 (24): 4061-4067.

Yonggang Huang's picture

Part II of Professor Christensen's paper on failure mechanics is published in JAM

Failure Mechanics—Part II: The Central and Decisive Role

of Graphene in Defining the Elastic and Failure Properties

for all Isotropic Materials

 

Continuing from Part I (Christensen, 2014, “Failure Mechanics—Part I: The Coordination

Between Elasticity Theory and Failure Theory for all Isotropic Materials,” ASME J.

Appl. Mech., 81(8), p. 081001), the relationship between elastic energy and failure specification

is further developed. Part I established the coordination of failure theory with

skumaar's picture

Multiple PhD/Postdoc Positions/Spring 2015

Advanced Materials and Multifunctional Structures (AMMS) Group at Masdar Institute (MI) is seeking suitably qualified candidates for PhD/Postdoctoral positions. Please see attached document for details

Extinct Kangaroos Couldn't Hop

Another couple of interesting articles to share. Using some "mechanics" principles, researchers have reasoned that 100,000 years ago, kangaroos were too heavy to hop.

A while ago, a different group of researchers published the results of computer modelling (using genetic algorithms) that showed dinosaurs might have hopped and skipped as forms of locomotion! (But only if particularly happy?)

These articles might be good to share with undergraduate engineers for discussion in tutorials. There are issues to discuss with assumptions in both cases. 

Conversion of nanoindentation data into stress-strain curves

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Hello, colleagues! 

Could anybody help me with the problem? How to convert nanoindentation data (force - penetration depth) into stress-strain curves? Is there any method that allows to make such a conversion if Berkovich indenter was used?

 

Thank You!

 

Best regards, 

Loginov Pavel (NUST MISIS engineer)

Amit Pandey's picture

in-situ Young's moduli of the constitutive layers in a multilayer systems (e.g. thin films, SOFCs, TBCs etc.)

 

This recent article present an improved methodology to calculate in-situ Young's moduli of the constitutive layers in a multilayer systems (e.g. thin films, SOFCs, TBCs etc.)

Pandey, A., Shyam, A., Liu, Z., & Goettler, R. (2014). In-situ Young’s Moduli of the Constitutive Layers in a Solid Oxide Fuel Cell. Journal of Power Sources.

 

http://www.sciencedirect.com/science/article/pii/S0378775314015341 

 

Highlights

Amit Pandey's picture

in-situ Young's moduli of the constitutive layers in a multilayer systems (e.g. thin films, SOFCs, TBCs etc.)

 

This recent article presents an improved methodology to calculate in-situ Young's moduli of the constitutive layers in a multilayer systems (e.g. thin films, SOFCs, TBCs etc.)

 

Amit Pandey, Amit Shyam, Zhien Liu, Richard Goettler, In-situ Young's moduli of the constitutive layers in a solid oxide fuel cell, Journal of Power Sources, Volume 273, 1 January 2015, Pages 522-529

 

http://www.sciencedirect.com/science/article/pii/S0378775314015341 

 

Highlights

Experiment.com: Can molecules make music?

Experiment.com is a crowdfunding site for research (a Kickstarter for science!).

Open to all, a target amount for a project is set, and funds are raised through small individual donations. The success is based on how many people like your idea. It's kind of a fun/alternative idea to traditional grant sources! If you have an interesting idea, I recommend it.

kashif355's picture

Discrete and smeared approach

I am structural engineering student , working on discrete and smeared model of 1/4 th scale bridge girder using ANSYS software and facing some problems.Some problems regarding discrete approach are: 1. can I use beam188 instead of link180 for modeling reinforcing steel???2. what should I use value of shear transfer coefficient for open and closed crack ?? what is criteria for using these coefficient??3. How can I apply load in multi-steps (load step1 ,load step2 ,load step3. etc) ???4. How can I set convergence criteria???

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