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# ebarbero's blog

## Using Abaqus CZM, How can I get crack length for each increment?

Tue, 2021-05-04 12:01 - ebarberoWhen using CZM for crack propagation, for each CZM element, once the separation delta > delta_c, the adhesive is completely damaged, cannot transmit stress. delta_c is the separation on the right side of the bilinear or trapezoidal models. How can I get the length of the crack for each increment of applied displacement or load? I can see that the totally damage element disappear from the Visualization but I need a better way that gives me crack length, not just a picture that shows the crack longer for each increment.

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## Abaqus startup start-up initialization file Python script

Mon, 2019-01-28 07:38 - ebarberoI need to find a startup file that Abaqus/CAE reads on startup to add a line of Python to modify the behavior the way I like it. I find myself adding this line manually every time I start Abaqus/CAE and I am tired of it. Like the .gpr file but .grp is a binary file--I cannot add things to it with a text editor. It has to be an initialization file, right? Or may be some other way to do it. Thanks in advance.

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## how to access the main page of abaqus-docs.mit.edu

Sun, 2019-01-27 07:17 - ebarberoI found a great tutorial for abaqus/cae at https://abaqus-docs.mit.edu/2017/English/SIMACAEGSARefMap/simagsa-m-Caeb... but I cannot find the main page, which I need to navigate it; I am forced to Google for individual sections guessing at what the section titles migh be; I need a URL to the root page so I can navigate the tutorial like an ebook.

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## ERRATA for Beyond plain weave fabrics-I. Geometrical model, Composite Structures, 2010

Thu, 2013-04-11 10:41 - ebarberop. 1426, last par., should read (revision in [brackets]): "Satin weaves are depicted on Figs. 1c, 3d and e, again with the fills horizontal and the warps vertical. A [satin] is generated by..."

See also http://dx.doi.org/10.1016/j.compstruct.2010.11.014

and http://dx.doi.org/10.1016/j.compstruct.2010.11.016

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## Easily calculate longitudinal compression strength of unidirectional composites

Thu, 2013-04-11 03:17 - ebarberoThe longitudinal compression strength of unidirectional composites F1c, also called Xc, is very difficul to test for, so often you don't have the value for the particular material (fiber, matrix, volume fraction) that you wish to use. Further, just having data does not tell you what paramaters really influence its value--it is not the compressive strength of the fiber, I can assure you. So, there is a simple formula that you can use to predict its value and also to understand what are the parameters that really affect the compression strength of the composite.

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## How to find material parameters for Abaqus PDA

Thu, 2013-04-11 03:08 - ebarberoThe PDA model implemented in Abaus is an implementation of the idea of the cohesive zone model (CZM), which is quite popular for the analysis of delaminations, but PDA is for intralaminar damage. The problem my group faced when trying to use PDA was "where do we get the material parameters?" We asked around in blogs and such but could not find a definitive answer. So, we went to work and came up with a methodology that may serve you.

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## New book: FEA of composites using Abaqus

Thu, 2013-04-11 03:05 - ebarberoNew textbook includes an explanation of the concepts involved in the detailed analysis of composites, a sound explanation of the mechanics needed to translate those concepts into a mathematical representation of the physical reality, and a detailed explanation of the solution of the resulting boundary value problems by using commercial Finite Element Analysis software such as Abaqus.

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## Abaqus UGENS/UMAT for composites damage

Fri, 2013-04-05 06:06 - ebarberoA discrete damage mechanics (DDM) model is now available as a UGENS/UMAT implementation for Abaqus/standard. This is an analytic constitutive model for laminates composites, based on discrete fracture mechanics. It is capable of predicting matrix crack initiation and crack density evolution using just two parameters--the critical energy release rates (ERR) in opening mode I and shear mode II. A methodology is available to determine those (invariant) material properties from experiments.

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## ERRATA for Introduction to Composite Materials Design--Second Edition (2010) CRC, ISBN: ISBN 978-1420079159

Sat, 2010-12-11 12:19 - ebarberoFor the most up to date corrections to the book, go to http://forum.cadec-online.com/viewtopic.php?f=9&t=34

## ERRATA for Finite Element Analysis of Composite Materials (2007) CRC, ISBN: 1-4200-5433-3

Sat, 2010-12-11 09:42 - ebarberoFor the most up to date ERRATA, go to http://www.mae.wvu.edu/barbero/feacm/errata_feacm.htm

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## Unofficial ERRATA and Commentary for Continuum Mechanics for Engineers--3rd ed.

Sun, 2010-10-03 10:05 - ebarbero
Unofficial ERRATA and Commentary for

Continuum Mechanics for Engineers--3rd ed.

G. T. Mase, R. E. Smelser, and G. E. Mase, CRC, 2010

ISBN: 978-1-4200-8538-9

http://www.amazon.com/exec/obidos/ASIN/1420085387/booksoncomposite

See attachement; updated frequently.

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