Friday, June 14, 2013

One thing I dislike about the English language: hyphenation

One thing I dislike about the English language: hyphenation

% word list correct hyphenation or lack thereof (done)
% microscale
% micromechanics
% micromechanical
% microstructure
% mesoscale
% nonlinear
% pseudocode
% in-plane
% in-situ
% pop-up

% von Mises
% Weibull

Saturday, December 01, 2012

Recommended article on ScienceDirect

SciVerse Home ScienceDirect® Home

     Sent By:    Ejb  
    Fresh from the press. Novel solution for composites with intralaminar damage.

 1.Benchmark Solution for Degradation of Elastic Properties due to Transverse Matrix Cracking in Laminated Composites Original Research Article
Composite Structures, In Press, Accepted Manuscript, Available online 29 November 2012
E.J. Barbero, F.A. Cosso, F.A. Campo
 

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Monday, May 28, 2012

STRUCTURAL MEMBRANES 2013

STRUCTURAL MEMBRANES 2013
VI International Conference on Textile Composites and Inflatable Structures
October 9-11, 2013, Munich, Germany
http://congress.cimne.com/membranes2013
STRUCTURAL MEMBRANES 2013 is now open to abstract submissions.
Important dates:
Deadline for presenting a one page abstract: 11 February 2013
Acceptance of the contributions: 15 March 2013
Deadline for submitting the full paper (not mandatory) and early payment: 15 May 2013
For any additional information, please do not hesitate to contact the congress secretariat (membranes@cimne.upc.edu)

Thursday, May 17, 2012

Sunday, April 29, 2012

ERRATA for http://dx.doi.org/10.1016/j.compositesb.2009.10.001

ERRATA for Barbero, E. J. and D. H. Cortes, A Mechanistic Model for Transverse Damage Initiation, Evolution, and Stiffness Reduction in Laminated Composites, Composites Part B, Web: Oct. 8, 2009 as http://dx.doi.org/10.1016/j.compositesb.2009.10.001, print:  41(2) 124–132, March 2010.

 
p. 127, below (26)
where it reads:
"; and A is the crack area in the Vuc, that is 4 times the thickness of the lamina (2 faces of the crack times 2 symmetric cracking laminae)."
it should say:
"; and A is the crack area in the Vuc, that is equal to the thickness of the cracking lamina. Only one face of the center crack (that may/may not propagate between two established cracks, see Fig. 1) is counted as area because the material property used is not the Griffith's surface energy \gamma_c but the Energy Release Rate G_c=2*\gamma_c. Furthermore, according to the definition of RUC given in Sect. 2.1 (second paragraph), the volume of the RUC is Vruc=2*l*sum(tk), where 2*l is the established (converged) crack spacing, and the sum extends over the symmetric one half of the laminate only. The crack spacing used in the computation of Vruc is the value converged at the last increment of applied strain, i.e., when the internal stresses equilibrate the applied loads."

Thursday, April 05, 2012

How to change the Default Working directory in Abaqus

In Abaqus, the default working directory is set when installing the product.
To change it at a latter time, simply right click in the Abaqus CAE start menu icon, then Properties and change the "Start in" field to whatever you want.

Sunday, March 11, 2012

Monday, February 27, 2012

The WVU International Students Organization gave me a big surprise tonight: the Alvis Award for contributions to Morgantown's International Community. I am thrilled.

Friday, February 24, 2012

DEFAULT values added to CADEC

DEFAULT values have been added to CADEC for Fiber, Matrix, Lamina, and Laminate. No more guessing around what values to use for strange properties that only Dr.B knows about. Now we have DEFAULTS. When you create a new Fiber, Matrix, Lamina, or Laminate, all fields except the Name (of the object) are filled up with data. Give it a Name and change only the data you know. Fibers default to Carbon T300. Matrices defaults to a generic Epoxy.

THE AERONAUTICAL JOURNAL Book Review

THE AERONAUTICAL JOURNAL

MAY 2011

Book Reviews

Introduction to Composite
Materials Design – Second
edition

E. J. Barbero

CRC Press, 2 Park Square, Milton Park;
Abingdon, Oxon, OX14 4RN. 2010. 520pp.
Illustrated. £69.99. ISBN 978-1-4200-7915-9.

The first edition of this book written
by Ever J. Barbero, Professor of
Mechanical and Aerospace
Engineering at West Virginia University,
was published by CRC Press in 1998.
Since then the Airbus A380 – the first
commercial aircraft to have a central wing
box made of carbon fibre-reinforced plastic
– has entered into service, and the use of
composites has increased in almost every
part of the market.
The second edition of the book reflects
the advances in knowledge and design
methods for composites acquired within
the past decade. Like the first edition, it is
aimed at senior level undergraduate engineering
students with no prior knowledge
of composites as well as at self-studying
practicing engineers wishing to be able to
design and fabricate composite structures.
All ten chapters from the first edition
have been retained, but revised and
expanded to accommodate new information.
The first seven chapters –
Introduction, Materials, Manufacturing
Processes, Micromechanics, Ply
Mechanics, Macromechanics, Strength –
appear in the same order as before, since,
in view of many who used this book in
their teaching, the material contained
therein can be taught as a one-term undergraduate
course. In Chapter 1, two new
topics are introduced – design for reliability
and fracture mechanics, which are then
applied throughout the rest of the book.
Chapter 7 dealing with prediction of failure
has been thoroughly revised to include the
most advanced prediction and design
methodologies.
Chapters 8-13 cover a number of applied
composite design topics including Damage
(Chapter 8) and Fabric-reinforced
Composites (Chapter 9). Composite structures
such as Beams, Plates, Stiffened
Panels and Shells are covered in Chapters
10-12, which have been revised, compared
to the first edition. Chapter 13 –
Strengthening of Reinforced Concrete – is
a new chapter focussing on external
strengthening of beams and columns, the
most promising application of composite
materials in civil engineering. Aimed at
advanced undergraduate and graduate
level, these chapters offer topics suitable
for special projects or introductory courses
for particular audiences.
The second edition contains an impressive
number of fully worked design-oriented
examples (78 compared to 50 in the
first edition) and end-of-chapter exercises
(167 compared to 115 in the first edition),
all of them using material property data
and information available in 35 tables
within the book.
This textbook will undoubtedly help the
readers gain a better understanding of
material selection, fabrication, material
behaviour and structural analysis involved
in design of composite structures; it will
allow those designing with composites to
fully take advantage of the flexibility
offered by composites.

Dr Maria Kashtalyan
University of Aberdeen

Saturday, February 18, 2012

Learn to use cadec-online.com from Abaqus

Learn to use cadec-online.com from Abaqus & other programs at cadec-online.com/help/api.aspx

Thursday, February 09, 2012

WVU students take 2nd and 3rd places

The WVU Student Chapter of SAMPE, the Society for Advanced Materials and Process Engineering, traveled to Washington DC to participate in the Student Research Symposium that took place on the evening of February 8, 2012. MS-ChE student Borja Cantero Tubilla secured 2nd place in the paper competition, and Ph.D. student Engin Ciftyurek secured 3rd place in the poster competition. Borjas’s topic “Direct Carbon Fuel Cell” captivated the audience. His mastery of the subject matter further impressed the audience during the Q&A part of the talk. Engin’s poster “High-temperature Degradation of Platinum Thin Films” drew an uninterrupted stream of curious students and engineers from the Baltimore/Washington area. Dr. Barbero, chapter advisor, accompanied the speakers and additional WVU students to the event. Borja’s work on Fuel Cells is supervised by Dr. Sabolsky (MAE) and Zondlo (ChE). Engin’s work on Platinum Thin Films is supervised by Dr. Sabolsky. Dr. Barbero wishes to acknowledge the support from the Energy Materials Science and Engineering Program at WVU and the SAMPE B/W Chapter for making participation in this event possible.

Friday, January 06, 2012

Wednesday, December 21, 2011

WVU Researchers Successfully Test Tunnel Plug

The West Virginia University College of Engineering and Mineral Resources announced today they conducted a successful performance test of a Resilient Tunnel Plug for isolating sections of transit or rail tunnels in response to events, such as flooding, release of chemical/biological agents or other threats.

The RTP is a 16.2-foot diameter x 32-foot long inflatable structure capable of blocking the flow of pressurized liquid and gas through a tunnel. Testing was performed in WVU's full-scale tunnel facility, a 50-foot long x 16.2-foot diameter steel tunnel mock--up that can be configured to emulate a variety of real tunnel geometries and operating conditions.

The RTP was initially deployed in the confined environment of the tunnel, demonstrating successful conformance of the RTP to the internal features of the mock-up tunnel. Then it was pressurized to reach the desired operating conditions. Further, water was introduced into the closed end of the tunnel behind the plug and water pressure was increased to simulate a flooding event.

This was the first ever test of this type, demonstrating the feasibility of the RTP to block the undesired flow. A team of students, faculty, and staff with expertise in Civil and Mechanical Engineering developed the unique facility and have performed a series of tests with different plug variants.

"The successful test demonstrates the high quality of the innovations and hard work of the team," said Ever Barbero, professor of mechanical and aerospace engineering at WVU. "We are now confident that we will be able to optimize the system and deliver it to the user for field implementation in the near future."

Development of the RTP technology is conducted in partnership with the Pacific Northwest National Laboratory and ILC Dover under the sponsorship of the Department of Homeland Security Science & Technology Directorate.

###

mcd/12/21/11

........................................................................................................................

For more information on news and events in the WVU College of Engineering and Mineral Resources:
Email: EngineeringWV
Phone contacts:
College Relations office, 304-293-4086
Office of the Dean, 304-293-4157
Other College administrative and department offices:
www.cemr.wvu.edu/welcome/administration

Wednesday, November 16, 2011

SYMPOSIUM: Textile Composites, Fabrics, and Inflatable Structures

SYMPOSIUM: Textile Composites, Fabrics, and Inflatable Structures
Chair: Ever J. Barbero
Paper Titles
-Determination of Basis Values from Experimental Data for Composite and Textile Materials
-Simulation of inflatable structures undergoing large deformations
-Experimental Evaluation of Shear Strength of Woven Webbings and Fabrics
-Past, Present and Future of Inflatable Structures
-An Instant Cost Estimation Tool – Assistance to Designers of Form-Active Structures
-Strong & light: Inflatable structures with Tensairity
-Resiliant Multi-Layer Webbing Reinforced Inflatable Structures
-Inflatable plug for threat mitigation in transportation tunnels
-Theory of inflatable structures (pillows) and materials fitting their necessities

Adi Adumitroaie

PhD Dissertation Defense
By: Adi Adumitroaie
Title: Initiation and Evolution of Matrix Cracking in Non-Symmetric Laminates under In-Plane and Flexural Loading
Date: Thursday, December 8, 2011 Time: 2:00 PM
Place: G112 ESB West Virginia University
Open to the public

PhD Dissertation Defense

By: John Sandro Rivas Murillo
Title: Structural and mechanical properties of silica and hybrid aerogels and xerogels studied using molecular dynamics simulations
Date: January 11, 2012
Time: 3:00 pm
Place: 115A, Engineering Science Building, West Virginia University
Open to the public

Monday, November 14, 2011

Preview checkmark accelerates laminate input in CADEC

We added an on/off toggle check mark to the Edit laminate page in CADEC to make data entry faster. Turn it off if you have to enter many laminas and u r in a hurry. use the TAB key on your keyboard to navigate the numeric fields for faster data editing. Turn it on to see a graphical representation of the laminas including type of lamina, orientation, and thickness.

[ABD] matrix into Abaqus/CAE

You can enter the laminate matrix as a General Section. Upper half of symm matrix. In Menu: Section Create. No need to define a Material. Must enter intralam shear H matrix also. Check mark Shear to enter H44 H55 H45 as k1 k2 k12.

Sunday, November 13, 2011

Notepad++ is great

Free @ notepad-plus-plus.org
Among many features... U can get text files nicely formatted to go as verbatim in ur LaTeX files.
In n++
Settings. Preferences. Tabs. Tab size: 4. Replace by space. Normal. Use default value.
Then in Winedt
Otions. Preferences. Tabs. Length: 4. Aligned tabs.