The items are arranged by category in the sections New Features, Improvements and Enhancements, and Bug Fixes. Some of the bug fixes may have also been included in other recent releases. The remainder of this file provides a brief description of new features, enhancements, and bug fixes in version R13.0.0. The solvers described in this manual are intended for including manufacturing results in structure analyses. With this release, we have a new manual: Volume IV Multiscale for analyses that involve multiple scales.
Note that there may be features mentioned in the DRAFT User manual which are not implemented for R13.0.0. Until such time the R13.0 User manual is posted at the DRAFT User Manual may be used as a temporary substitute. Please contact your LS-DYNA distributor or your Ansys sales representative if you have to have your license updated. The string REVISION 13 must appear in the LS-DYNA license file in order to run version R13. It is notable that kink-band boundaries are delineated by fibre fractures, many of which exhibit wedge-shaped multiple fractures.This file constitutes revision 0 of the release notes for LS-DYNA version R13.0.0. Even at 99.9% of the failure load this micro-buckle band is much narrower (~150 μm (~12 fibre diameters) wide), and the angle of inclination of the band much shallower (~8°), compared to the final 300–400 μm (25–33 fibre diameters) wide, and 25–30° inclined, kink band. The precursor to kink-band nucleation has been identified as a local tilting of fibres in the region where the kink bands ultimately form, defining a micro-buckle band.
However, the change in the fibre shapes during axial compression is similar for all fibres, as the fibres deflect towards the final kinking direction. Initially the fibre trajectory varies significantly from fibre to fibre, the waviness of which cannot be represented by a simple idealised profile. The 3D trajectories of individual fibres were extracted to monitor the change in fibre profiles with increasing compressive load. This has been achieved by in situ synchrotron X-ray computed tomography (CT) quantified by advanced image analysis. We present the first experimental observation and quantification of the evolution of the three-dimensional (3D) deflection of fibres leading up to kink-band formation in notched unidirectional glass fibre-epoxy composites.
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