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3D Printing with Wood Challenge

3D Geometric CLT Cores

  • Creator
  • #3964

    Jordan Barlow

    <p class=”MsoNormal”>By using Laminated Object Manufacturing (LOM) one could produce core geometries that would otherwise be difficult or impossible to produce with traditional wood manufacturing methods.  LOM is appealing because the wood fibre is still in a state where many of it’s natural benefits can still be taken advantage of.</p>
    <p class=”MsoNormal”>Honeycomb is a structure found throughout nature from beehives to bird bones.  Honeycomb is already used in industry where high strength to weight ratios are required such as in aviation.  However, its material composition is often limited to extruded metals and polymers.</p>
    <p class=”MsoNormal”>Cross Laminated Timbers (CLT) are pushing the boundaries of the types of structures we can create with wood.  Three common weaknesses of CLT’s include acoustical performance, systems integrations (plumbing/electrical/hvac/etc), and floor spans.  I believe that using a geometric wood composite core within a CLT can help with all three of these weaknesses while not sacrificing the strengths of CLT’s (fire resistance, environmental performance, fast installation, thermal performance, seismic advantage, etc)</p>
    <p class=”MsoNormal”>A honeycomb core would reduce the weight of a CLT panel, but maintain structural strength.  This could lead to larger room spans with thinner panels.   The cavities would provide improved acoustical properties as sound dissipates by traveling through different mediums (solid/liquid/gas).  Finally, larger cavities could be incorporated within the core (see fig) to allow for better systems integration.  This could be done on a specific panel by panel basis.</p>
    <p class=”MsoNormal”>Due to the repetitive pattern of the honey comb a gantry type system with multiple heads could be used to expedite the manufacturing process.  The fibre within the core could even be oriented in specific directions to add strength to off axis walls.  Even more complex geometric shapes such as octet truss and diamond cubic could be a possibility as additive manufacturing with wood develops.

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  • Author
  • #3998

    Mark Anson

    I agree that wood based structures can be dramatically improved by careful placement of material.  I have always been fascinated by the strength of paper, especially in products like Honeycomb core panels.

    If stress loads can transfer through your honeycomb layer then you have turned the panel into a stress skin panel, very efficient. It also separates elements which results in better acoustic and thermal performance.

    Joints between panels could be made from splines that replace part of the honeycomb layer.

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