Infoplaner 1-2007 - Cadfem

CADFEM INFOPLANER 1/2007• A database of material propertytest data for concrete,wood, and soil. Additional testdata will be added in futurereleases. Test data contributionsfrom users are welcome.• A read curve capability forincorporating user-specific testdata. This feature is useful forplotting newly acquired dataor for data that is proprietaryto the user.• An automated procedure forfitting each material modelto test data by interfacing theMMCD with the LS-OPT code (Fig. 2). The MMCD queriesthe user for the pertinent LS-OPT input, creates the LS-OPTinput file, executes the LS-OPT code, then gathers and plotsthe results. Results automatically plotted include optimizedfits of the material model response to test data (Fig. 3), andvalues of fitted material model parameters versus iterationnumber.• The capability to create report-quality graphs using ScalarVector Graphics. Graphs may be plotted with multiple curveswith x-axis and y-axis components selected from listings ofstress, strain, principal stress, principal strain, and invariants.The user may also select preferences for font type/size/colorand curve colors/styles/symbols.• The capability to manipulate plotted curves via cross-plots,integration, shifting, subtraction, and swaping of the x andy axes. These features are useful for converting units ormanipulating test data so that it correlates with computedresponse.• The capability to plot selected 3D yield surfaces, and torotate and translate those surfaces about various axes (Fig.4). Yield surfaces currently implemented include Mohr-Coulomb,Von-Mises, linear and parabolic Drucker Prager, Tresca,continuous surface cap (159), wood (143), and soil (147).• The ability to create LS-DYNA material model input files(*MAT portion only) following final selection or fit of materialmodel parameters.• HELP files that include “Getting Started” guidance and examplecalculations, along with instructions and commentaryon each GUI menu, available test data, and MMCD theory.Fig. 2: Example GUI for interfacing LS-OPT with the MMCD.Fig. 3: Example fit of model to concrete data in uniaxial tensile stress.Fig. 4: Example 3D surface showing that concrete model 159 has asmooth intersection between the failure surface and hardening cap.AuthorsYvonne D. Murray; Carolyn M. Yeager, APTEKyvonne@aptek.com and yeager@aptek.comReferencesLSTC, LS-DYNA Keyword User’s Manual, Version 971 Beta,Livermore Software Technology Corporation, LivermoreCalifornia, January 2007.Stander, N., W. Roux, T.Eggleston, and K. Craig, LS-OPTUser’s Manual, Design Optimization for the EngineeringAnalyst, Version 2.2, Livermore Software Technology Corporation,Livermore California, 2004.Your contact for LS-DYNA and materials modelingDr.-Ing. Matthias Hörmann, CADFEM GmbHPhone +49 (0)8092-7005-41E-Mail mhoermann@cadfem.deA free demonstration version and sales information will beavailable at APTEK’s website www.aptek.com/mmcd in May2007. Email the authors or Matthias Hoermann for details.33Software