<materials>

  <material name="Aluminum 8009" type="isotropic">
	  <!-- unit: lbf.sec^2/in^4 -->
    <density>0.271959e-3</density>
    <elastic>
	    <!--unit:psi -->
      <e>13.1E+06</e>
      <nu>3.30E-01</nu>
    </elastic>

    <failure_criterion>max principal stress</failure_criterion>
    <!-- <characteristic_length>0</characteristic_length> -->
    <strength>
      <xt>55.8e3</xt>
      <xc>55.8e3</xc>
    </strength>
  </material>  
  <lamina name="Aluminum 8009_0.01">
    <material>Aluminum 8009</material>
    <thickness>0.01</thickness>
  </lamina>


  <material name="lead" type="isotropic">
	  <!--density unit: lbf.sec^2/in^4 -->
    <density>1.060957e-3</density>
    <elastic>
      <e>1e-3</e>
      <nu>0</nu>
    </elastic>
    <failure_criterion>max principal stress</failure_criterion>
    <characteristic_length>0</characteristic_length>
    <strength>
      <xt>2.610000e+00</xt>
      <xc>2.610000e+00</xc>
    </strength>
  </material>



  <material name="Rohacell 70" type="orthotropic">
    <!-- unit: lbf.sec^2/in^4 -->
    <density>7.040895e-6</density>
    <!-- unit: psi -->
    <elastic>
      <e1>13.125e3</e1>
      <e2>13.125e3</e2>
      <e3>13.125e3</e3>
      <g12>4.118e3</g12>
      <g13>4.118e3</g13>
      <g23>4.118e3</g23>
      <nu12>3.15E-01</nu12>
      <nu13>3.15E-01</nu13>
      <nu23>3.00E-01</nu23>
    </elastic>
    <failure_criterion>tsai-wu</failure_criterion>
    <characteristic_length>0</characteristic_length>
    <strength>
      <xt>398</xt>
      <yt>398</yt>
      <zt>398</zt>
      <xc>213</xc>
      <yc>213</yc>
      <zc>213</zc>
      <r>185</r>
      <t>185</t>
      <s>185</s>
    </strength>
  </material>




  <material name="Plascore PN2-3/16OX3.0" type="orthotropic">
    <!-- unit: lbf.sec^2/in^4 -->
    <density>4.509066e-6</density>
    <!-- unit: psi -->
    <elastic>
      <e1>1e3</e1>
      <e2>1e3</e2>
      <e3>20e3</e3>
      <g12>1e3</g12>
      <g23>5.799e3</g23>
      <g13>3.5e3</g13>
      <nu12>3.00E-01</nu13>
      <nu13>1.00E-02</nu12>
      <nu23>1.00E-02</nu23>
    </elastic>
    <failure_criterion>tsai-wu</failure_criterion>
    <characteristic_length>0</characteristic_length>
    <strength>
      <xt>10</xt>
      <yt>10</yt>
      <zt>330</zt>
      <xc>10</xc>
      <yc>10</yc>
      <zc>330</zc>
      <r>176</r>
      <t>118</t>
      <s>5.799</s>
    </strength>
  </material>


  <material name="AS4 12k/E7K8" type="transversely isotropic">
	  <!-- unit: lbf.sec^2/in^4 -->
    <density>0.145973e-3</density>
    <elastic>
	    <!-- unit: psi (lbf/in^2) -->
      <e1>19.3E+06</e1>
      <e2>1.23E+06</e2>
      <g12>7.31E+06</g12>
      <nu12>3.20E-01</nu12>
    </elastic>
    <failure_criterion>tsai-wu</failure_criterion>
    <characteristic_length>0</characteristic_length>
    <strength>
      <xt>303e3</xt>
      <yt>5.47e3</yt>
      <xc>245e3</xc>
      <s>16.5e3</s>
    </strength>
  </material>
  <lamina name="AS4 12k/E7K8_0.0054">
    <material>AS4 12k/E7K8</material>
    <thickness>0.0054</thickness>
  </lamina>



  
  <material name="S2/SP381" type="transversely isotropic">
	  <!-- unit: lbf.sec^2/in^4 -->
    <density>0.173109e-3</density>
    <elastic>
	    <!--unit:psi -->
      <e1>7.05E+06</e1>
      <e2>1.97E+06</e2>
      <g12>0.59E+06</g12>
      <nu12>0.263</nu12>
    </elastic>
    <failure_criterion>tsai-wu</failure_criterion>
    <characteristic_length>0</characteristic_length>
    <strength>
      <xt>221.91e3</xt>
      <yt>8.20e3</yt>
      <xc>173.32e3</xc>
      <yc>39.78e3</yc>
      <s>19.17e3</s>
    </strength>
  </material>
  <lamina name="S2/SP381_0.0092">
    <material>S2/SP381</material>
    <thickness>0.0092</thickness>
  </lamina>





  <material name="T300 15k/976" type="transversely isotropic">
	  <!-- unit: lbf.sec^2/in^4 -->
    <density>0.149716e-3</density>
    <elastic>
	    <!-- unit: psi -->
      <e1>19.6E+06</e1>
      <e2>1.34E+06</e2>
      <g12>0.91E+06</g12>
      <nu12>3.48E-01</nu12>
    </elastic>
    <failure_criterion>tsai-wu</failure_criterion>
    <characteristic_length>0</characteristic_length>
    <strength>
      <xt>211e3</xt>
      <yt>5.66e3</yt>
      <xc>136e3</xc>
      <yc>30e3</yc>
      <s>11.1e3</s>
    </strength>
  </material>
  <lamina name="T300 15k/976_0.0053">
    <material>T300 15k/976</material>
    <thickness>0.0053</thickness>
  </lamina>

  <!--Material: T650-35 12k/976 unidirectional tape   
  Source: Military Composite Materials Handbook. Volume 2. 2002
  Unit: Imperial unit -->
  <material name="T650-35 12k/976" type="transversely isotropic">
	  <!-- unit: lbf.sec^2/in^4 -->
    <density>0.148781e-3</density>
    <elastic>
	    <!-- unit: lbf/in^2 -->
      <e1>22.0E+06</e1>
      <e2>1.30E+06</e2>
      <g12>0.745E+06</g12>
      <nu12>1.150E-01</nu12>
    </elastic>
    <failure_criterion>tsai-wu</failure_criterion>
    <characteristic_length>0</characteristic_length>
    <strength>
      <xt>231e3</xt>
      <yt>5.71e3</yt>
      <xc>150e3</xc>
      <yc>33.6e3</yc>
      <s>14.9e3</s>
    </strength>
  </material>
  <lamina name="T650-35 12k/976_0.0052">
    <material>T650-35 12k/976</material>
    <thickness>0.0052</thickness>
  </lamina>



  <material name="E-Glass 7781/EA 9396" type="transversely isotropic">
	  <!-- unit: lbf.sec^2/in^4 -->
    <density>0.179660e-3</density>
    <elastic>
	    <!-- unit: lbf/in^2 -->
      <e1>3.39E+06</e1>
      <e2>3.41E+06</e2>
      <g12>0.758E+06</g12>
      <nu12>1.150E-01</nu12>
    </elastic>
    <failure_criterion>tsai-wu</failure_criterion>
    <characteristic_length>0</characteristic_length>
    <strength>
      <xt>48.3e3</xt>
      <yt>50.5e3</yt>
      <xc>46.4e3</xc>
      <yc>37.7e3</yc>
      <s>11.5e3</s>
    </strength>
  </material>
  <lamina name="E-Glass 7781/EA 9396_0.0083">
    <material>E-Glass 7781/EA 9396</material>
    <thickness>0.0083</thickness>
  </lamina>



  <material name="T650-35 3k 976_fabric" type="transversely isotropic">
	  <!-- unit: lbf.sec^2/in^4 -->
    <density>0.145973e-3</density>
    <elastic>
	    <!-- unit: lbf/in^3 -->
      <e1>10.4E+06</e1>
      <e2>10.0E+06</e2>
      <g12>0.8E+06</g12>
	    <!-- nu12 is approximate --> 
      <nu12>0.06</nu12>
    </elastic>
    <failure_criterion>tsai-wu</failure_criterion>
    <characteristic_length>0</characteristic_length>
    <strength>
      <xt>94.4e3</xt>
      <yt>93.7e3</yt>
      <xc>96.7e3</xc>
      <yc>92.6e3</yc>
      <s>15e3</s>
    </strength>
  </material>
  <lamina name="T650-35 3k 976_fabric_0.0062">
    <material>T650-35 3k 976_fabric</material>
    <thickness>0.0062</thickness>
  </lamina>


  <material name="T700 24K/E765" type="transversely isotropic">
	  <!-- unit: lbf.sec^2/in^4 -->
    <density>0.145037e-3</density>
    <elastic>
	    <!--unit:psi -->
      <e1>18.71E+06</e1>
      <e2>1.36E+06</e2>
      <g12>0.65E+06</g12>
      <nu12>0.319</nu12>
    </elastic>
    <failure_criterion>tsai-wu</failure_criterion>
    <characteristic_length>0</characteristic_length>
    <strength>
      <xt>370.31e3</xt>
      <yt>6.12e3</yt>
      <xc>179.72e3</xc>
      <yc>28.94e3</yc>
      <s>13.67e3</s>
    </strength>
  </material>
  <lamina name="T700 24K/E765_0.0056">
    <material>T700 24K/E765</material>
    <thickness>0.0056</thickness>
  </lamina>


</materials>
