group of nodes at crack bottom which will not be duplicated.</li>
<li><b>Group of elements to replace nodes with new ones</b>
(<em>mandatory</em>): the new nodes will replace the nodes to
group of nodes at crack bottom which will not be duplicated.</li>
<li><b>Group of elements to replace nodes with new ones</b>
(<em>mandatory</em>): the new nodes will replace the nodes to