Split Hopkinson Compression Test data analysis

I have performed some high strain rate split hopkinson
compression tests. The oscilloscope reads the incident and reflected
displacments (in input pressure bar) and transmitted displacment (in output
pressure bar) in volt. To convert displacement in volt (output voltage) to
mechanical strain (m/m), I have a difficalty. What is the relationship between
the output voltage (volt) (the reading from oscilloscope), excitation voltage (volt)
and strain gauge Gauge Factor (GF)?


ilinca's picture

Post-doctoral position (computational mechanics) at Rice University

Post-doctoral position available in computational mechanics at Rice University. The announcement and instructions to apply are posted at

http://www.owlnet.rice.edu/~is5/postdoctoral-fellow


Mechanics journal impact factors 2012

Some funding agencies require that articles be published only in journals with impact factors greater than 1. Here's a list from 2012 that tells you which to choose (if you care about impact factors).
-- Biswajit

 


Announcing Wear of Materials 2015 - Website has just gone live

20th International Conference on Wear of Materials
12-16 April 2015
The Sheraton Centre, Toronto, Canada

The 20th International Conference on Wear of Materials will focus on both the fundamental and applied aspects of wear and friction of materials at the macro-, micro-, and nano-scale. It will address the understanding of tribological phenomena; particularly the progress in recent decades and a special session will concentrate on modeling of wear.


Paper: On finding cohesive law parameters for foam-metal interfaces

A detailed report of our work on trying to find cohesive laws for interfacial fracture is attached.  I will add the experimental data after a shorter version of this report has been published.

The reason for posting this report on iMechanica is so that people who want to replicate the tests or perform similar tests know what is involved.  As we have found out, many details and potential problems faced by an experimentalist are hard to determine from the concise papers that are typically published as journal articles.

Please let me know if you have any questions.

-- Biswajit

Title:

 On finding cohesive law parameters for foam-metal interfaces

Authors:


Faculty Position - Computational Materials Science


The Department of Mechanical Engineering
at the University of Wyoming invites applications for a tenure-track faculty
position at the Assistant or Associate Professor level in the area of computational
materials science.  The successful
applicant will be expected to establish an externally funded research program, develop
collaboration within the Department and College, mentor graduate students, and teach
at both the undergraduate and graduate levels. 
Minimum qualifications include an earned doctorate in mechanical


CISM Advanced Course "Ferroic Functional Materials"

We would like to draw your attention to the advanced course at the International Centre for Mechanical Sciences (CISM) to be held in Udine (Italy) from September 8 through 12, 2014 on the topic of: "FERROIC FUNCTIONAL MATERIALS: EXPERIMENT, MODELING AND SIMULATION". The advanced course will comprise of distinguished lectures from the following experts:

- Kaushik Bhattacharya (Caltech, USA)
- Manfred Fiebig (ETH Zurich, Switzerland)
- John Huber (University of Oxford, UK)
- Doru C. Lupascu (University of Duisburg-Essen, Germany)
- Christopher S. Lynch (UCLA, USA)
- Jörg Schröder (University of Duisburg-Essen, Germany)

For more information please visit:
http://www.cism.it/courses/C1411/


Nuwan Dewapriya's picture

Modelling fracture of graphene using Griffith’s criterion and quantized fracture mechanics

In armchair graphene sheets, crack propagates perpendicular to the applied strain, whereas crack propagation in zigzag sheets occurs at an angle to the straining direction. This occurs due to different bond structure along armchair and zigzag directions as shown in Fig. 1. Videos 1 and 2 show the fracture of armchair and zigzag sheets, respectively.

 

Fig. 1: Armchair and zigzag directions of graohene


genepak's picture

Senior Researcher/Post-Doc Position in Solid Mechanics at AICT, Seoul National University, Korea

Applications are invited for the position of senior researcher/postdoctoral fellow in the following areas with special focus on multiscale defect mechanics of electronic materials and devices:


mohsenzaeem's picture

Call for Abstracts in Mini-Symposium on "Computational Modeling of Microstructural Evolution II”- ASME Congress 2014

Dear Colleague,

We would like to invite you to participate in a mini-symposium entitled “Computational Modeling of Microstructural Evolution II” in ASME 2014 International Mechanical Engineering Congress & Exposition (http://www.asmeconferences.org/Congress2014/).
ASME Congress and Exposition will be held in Montreal's downtown convention center, 14-20 November 2014.


siegmund's picture

Post Doc Position


Zhigang Suo's picture

Division of Labor

I have updated my notes on "Energe Release Rate.  Fracture Energy".  I will use my twitter account to update my teaching, research, and reading.  You will get an automatic update if you subscribe to my twitter account.

The qualitative picture of fracture may be well-understood, across disparate scales of length and time, from the distortion of electron clouds, to the jiggling of atoms, to the motion of dislocations, to the extension of the crack, to the load-carrying capacity of a structure.  This statement by itself, however, is of limited value: it offers little help to the engineer trying to prevent fracture of a structure.  Hypes of multiscale computation aside, no reliable method exists today to predict fracture by computation alone.


NEW: Case Studies in Non-Destructive Testing and Evaluation

Now accepting Case Studies! 


Reverse Engineering Ants for Robotics

New research is emerging out of a project where Ohio State University used our software to reconstruct the anatomy of an ant neck. In this project, micro-CT scans of an ant neck were reconstructed using Simpleware software and exported as a mesh for analysis in Abaqus.

Simulations in Abaqus identified where stress concentrations tend to take place for ants' necks, providing insight into how they are able to support large weights. This research has created the potential for developing micro-robots capable of handling similar loads, as well as other ant-inspired designs for space engineering.


Scholarship Boost for UK’s new Structural Integrity Research Centre

TWENTY
full scholarships are available on the 2014 Structural Integrity MSc programme developed
by Brunel University in collaboration with TWI as part of the work of the new National
Structural Integrity Research Centre, (NSIRC).


New Open Access journal: Case Studies in Engineering Failure Analysis

Read over 40 open access articles from Case Studies in Engineering Failure Analysis

Case Studies in Engineering Failure Analysis provides a forum for the rapid publication of short, structured Case Studies in Engineering Failure Analysis and related Short Communications, and will provide an essential compendium of case studies for practitioners in the field of engineering failure analysis and others who are interested in the ways in which components fail.

Read the 40+ articles that are live already!


Heating patterns in English homes: national survey vs common model assumptions

Hightlights of this open access article published in Building and Environment:
• Building stock models need to revise some of their assumptions on space heating.
• Weekends and weekdays are similar in their heating pattern and duration.
• Estimated heating demand temperature is slightly lower than the assumed 21 °C.
• Homes differ widely in their hours of heating and their demand temperature.
• The average temperature during heating periods is about 19.5 °C.


health and safety environmental management

 

Dear all  

i have question that i woud like to know about principle of putting monetary value on human to rduce risk and the principle of weighting the importance of risk , moreover is there any conflic between these principle  

 regards  


Submit an abstract for: Sixth International Conference on Engineering Failure Analysis

Sixth International Conference on Engineering Failure Analysis
6 – 9 July 2014, Lisbon, Portugal

Engineering failure analysis is a key tool for the improvement of the modern innovation cycle now demands that component design involves a whole-of-life approach, incorporating an awareness of manufacture, safety, reliability, environmental sensitivity and disposal. This has focused attention on the pivotal role of failure analysis as an essential tool to improve equipment availability, help prevent accidents and disasters and to inform the processes of design, manufacture, operation and maintenance of key plant and equipment.


faizan.iitm's picture

Crack length measurement

I am trying to measure J - integral from experiment. " Let my initial fatigue crack length is 6mm, then i did single specimen unloading compliance test on it. The crack legth increased to 8mm" If i want to model the same geometry in FEA. Now my doubt is that "what carck length should i take 1) Initial fatigue crack = 6mm 2) final crack length  = 8 mm.................... Note: I need to model my CT specimen in FEA  to correct my experiments :-)


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