overview papers Day, J., "Modeling of Composites in LS-DYNA", Livermore Software Technology Corporation, Livermore, California, August, 2008. http://ftp.lstc.com/anonymous/outgoing/jday/composites/mat_comp.pdf Haufe, A., Hartmann, S., Munz, T., "Die Simulation von Crash- und Impaktvorgängen auf Faserverbundstrukturen: Eine Herausforderung in der Produktauslegung", Fachkongress Composite Simulation, Ludwigsburg, Germany, February, 2012. http://www.composite-simulation.de/content/download/haufe.pdf New composite developments and research presented by DYNAmore: Hartmann, S., "Neue Matermodelle fur Composites in LS-DYNA", Composite Analysis with LS-DYNA, DYNAmore Gmbh, Stuttgart, Germany, April, 2013. http://www.dynamore.de/en/downloads/infodays/dokumente/2013-composites/newmaterials Kloppel, T., Liebold, C., and Haufe, A., "Recent Developments for Process Simulations of Composite Structures in LS-DYNA", Composite Analysis with LS-DYNA, DYNAmore Gmbh, Stuttgart, Germany, April, 2013. http://www.dynamore.de/en/downloads/infodays/dokumente/2013-composites/newdevelopments _______________________________________________________________________________________ Several papers (one involves three point bending) that might provide some guidance are given below. *MAT_058 (data included) was employed to represent a multi-shell model for the crushing of glass/polyester tubes; the benchmark testing included *MAT_054 and *MAT_059 whose behavior was considered undesirable for this particular simulation: Silcock, M.D., Hall, W., and Fox. B.L., "Finite element Modeling of Composite Tubular Crash Structures with an Explicit Code", 6th Automotive Composites Conference & Exhibition, Troy, Michigan, September, 2006. http://www.speautomotive.com/SPEA_CD/SPEA2006/PDF/g/g1.pdf A damage mechanics (*MAT_058) material model (data included) was used to predict the response of the Kevlar/Epoxy cell walls under three-point bending and dynamic crushing of the Deployable Energy Absorber (DEA): Polanco, M., Kellas, S., and Jackson, K., "Evaluation of Material Models within LS DYNA for a Kevlar/Epoxy Composite Honeycomb", 65th American Helicopter Society (AHS) Annual Forum, Grapevine, Texas, May, 2009. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090022372_2009022164.pdf *MAT_054 and *MAT_058 (data included) were evaluated for tensile testing modeling of Newport E-Glass fabric 7781/NB321 (laminated composite); *MAT_058 was evaluated for compressive testing: Olivares, G., Acosta, J.F., and Yadav, V., "Certification by Analysis I and II", JAMS Annual Meeting, Seattle, Washington, May, 2010. http://depts.washington.edu/amtas/events/jams_10/pap16-Olivares.pdf http://depts.washington.edu/amtas/events/jams_10/16.Olivares.pdf Best, James 12/14/11 hi I need a tutorial about how to model a composite in lsdyna step by step.I already ask from yahoo Group but it doesn't work. truly yours "James M. Kennedy" Dec 31 11:15AM -0600 Dear Ali, I am not sure what you think you did not receive from your questions. Are your problems with understanding the many different available options for composites materials (different *mat_xxxx's), the actual building of the model, etc. You perhaps need to do some work yourself and also have some understanding of composites. Just yesterday, I provided four different responses (messages #30930 thru 3093 in Yahoo LS-DYNA forum) for *mat_022, one of the more basic composite materials of LS-DYNA. Perhaps this simple example can be of some help to start (pretty simple geometry with data provided): http://www.dynaexamples.com/intro-by-a.-tabiei/tension/tension-vi Perhaps you can locate a copy of the following tutorial which then you can enhance or make substitutions for ANSYS/LS-DYNA: 21ST CAD-FEM USERS’ MEETING 2003 INTERNATIONAL CONGRESS ON FEM TECHNOLOGY 12–14, November 2003, Hotel DORINT SANSSOUCI Berlin, Potsdam, Germany Tutorial „Designing Composites with ANSYS“ Thursday, November 13, 2003 16:20 – 18:20 Due to the expanding market in applications of fibre reinforced composites and their special needs in designing structures, the numerical simulation of structures made of composites gains more and more importance. This tutorial’s aim is not only to show the capabilities of ANSYS with respect to the simulation of composites, but it is also the aim to give hints and recommendations how this can be actually done. Moreover modelling limitations and pitfalls will be pointed out throughout the tutorial. The tutorial is given by Peter Kohnke, ANSYS Inc., Clemens Dransfeld, DYNE Design Engineering GmbH, and Matthias Hörmann, CAD-FEM GmbH. Look at this composite modeler provided by SolidWorks: http://www.youtube.com/watch?v=cScwB_EcHhI&feature=related In the HyperMesh 6.0 Basic Tutorials Manual, there is an indication that in the Advanced Tutorial a composite tutorial entitled, "Composite Panel - HM-1300" (right off I could not locate the Advanced Tutorial): http://pacelab.utep.edu/Lab9/hm_basic_tutorials.pdf Perhaps you might find the following helpful: DYNAFAB is a pre-processor with a user-friendly GUI used to automatically create composite finite element models (primarily textile). http://www.nicomposites.com/index.htm Nilakantan, G., "DYNAFAB User Manual", Version 1.0, Nilakantan Composites, Bangalore, India, May, 2010. http://www.nicomposites.com/pdfs/DYNAFAB_Manual.pdf *MAT_161/*MAT_162 probably best address delamination and damage, in particular for visualizing its results. These models require an additional license from Materials Sciences Corporation (MSC), who developed and supports these models. http://www.materials-sciences.com/dyna.aspx http://www.materials-sciences.com/dyna-factsheet.pdf A description of the failure criteria plus a User's Manual (*MAT_161) are provided here (two animations are also included/login may be required): http://tech.groups.yahoo.com/group/LS-DYNA/files/Manual_msc.pdf http://tech.groups.yahoo.com/group/LS-DYNA/files/mat161_lstc.pdf http://tech.groups.yahoo.com/group/LS-DYNA/files/image_dlm.zip http://tech.groups.yahoo.com/group/LS-DYNA/files/image_imp.zip One can also obtain more information on *MAT_162 by going to the following site: http://www.ccm.udel.edu/Tech/MAT162/Intro.htm http://www.ccm.udel.edu/Tech/MAT162/MAT162Manual_v3.pdf Implementation of *MAT_161/*MAT_162 into LS-DYNA was given in the following two papers: Yen, C.F., "Analysis of Impact Progression in Composite Structures", 5th International LS-DYNA Users Conference, Southfield, Michigan, September, 1998. Yen, C.F., "Ballistic Impact Modeling of Composite Materials", 7th International LSDYNA Users Conference, Dearborn, Michigan, May, 2002. http://www.dynalook.com/international-conf-2002/Session_6-3.pdf As you can see, there is a wealth of information available. Just start searching and reading and asking good questions. Sincerely, James M. Kennedy KBS2 Inc. December 31, 2011