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      <title>Introduction</title>
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      <div class="title_topic1" id="xps10_pagetitle">Introduction</div>
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               <p class="para_td">Overview</p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('fabricflat/procedure.html');return(false);">How To</a></p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('fabricflat/dialog.html');return(false);">Options</a></p>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('fabricflat/warnings.html');return(false);">Related Topics</a></p>
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      </table><br><p class="para_topic">The NX Fabric Flattener generates flat patterns for woven or unidirectional fabric materials. You can use this function to flatten composite laminate plies, or any materials that conform to the theoretical models for woven or unidirectional fabrics.</p>
      <p class="para_topic">Two solvers are provided which can process multiple ply surfaces, cut curves, arbitrary or infinite stock (the raw material from which laminates are made) and additional curves and points.</p>
      <div class="title_division">Terminology</div>
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               <p class="para_td">Ply</p>
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               <p class="para_td">A single connected piece of material on the part surface.</p>
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               <p class="para_td">Stock</p>
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               <p class="para_td">The material used to form the ply. If defined, the stock must be a single planar face.</p>
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               <p class="para_td">Start Point</p>
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               <p class="para_td">The origin point on ply or stock that serves as a start point for meshing.</p>
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               <p class="para_td">Fiber Primary Direction</p>
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               <p class="para_td">Also called warp direction. A vector indicating one of the directions of fibers of the woven or unidirectional material.</p>
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               <p class="para_td">Fiber Secondary Direction</p>
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               <p class="para_td">Also called fill or weft direction. A vector that is woven materials indicates directions of crosswise fibers.&nbsp;In unidirectional materials it does not correspond to actual fibers but is still used.</p>
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               <p class="para_td">Cut Curves/Edges</p>
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               <p class="para_td">Curves and edges that indicate a discontinuity in the ply. These will map to two curves or strings of curves in the flat pattern.</p>
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               <p class="para_td">Additional Curves/Edges</p>
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               <p class="para_td">Additional curves or edges on the ply will map to the flat pattern. Those on the stock will map to the ply and from there to the flat pattern.</p>
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               <p class="para_td">Flat Pattern CSYS</p>
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               <p class="para_td">The local coordinate system of the flat pattern. The origin of this CSYS corresponds to the start points of the stock and of the ply. The X&ndash;axis of the CSYS corresponds to the primary fiber orientations. The Y&ndash;axis will correspond to the secondary fiber orientation unless the primary and secondary orientations are non&ndash;orthogonal; in any case they will be in the same general direction (i.e. not more than 90 degrees apart).</p>
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