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<p>(opening mode) the strain energy release rate and the stress intensity factor are related by:<br/>
:where E is the <a href="page.php?w=Young%27s_modulus">Young's modulus</a>, ? is <a href="page.php?w=Poisson%27s_ratio">Poisson's ratio</a>, and K<sub>I</sub> is the stress intensity factor in mode I. Irwin also showed that the strain energy release rate of a planar crack in a linear elastic body can be expressed in terms of the mode I, <a href="page.php?w=fracture">mode II</a> (sliding mode), and <a href="page.php?w=fracture">mode III</a> (tearing</p><p>
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