p">,</span> <span class="n">def_grad</span><span class="o">.</span><span class="n">inv</span><span class="o">.</span><span class="n">trans</span><span class="p">)</span></div>

<div class="viewcode-block" id="Stress.piola_kirchoff_2"><a class="viewcode-back" href="../../../../pymatgen.analysis.elasticity.stress.html#pymatgen.analysis.elasticity.stress.Stress.piola_kirchoff_2">[docs]</a>    <span class="k">def</span> <span class="nf">piola_kirchoff_2</span><span class="p">(</span><span class="bp">self</span>