{"id":396462,"date":"2024-12-05T15:09:14","date_gmt":"2024-12-05T15:09:14","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cinttypesifspar2-command-and-auxillary-field-i-am-confused\/"},"modified":"2024-12-05T15:09:14","modified_gmt":"2024-12-05T15:09:14","slug":"cinttypesifspar2-command-and-auxillary-field-i-am-confused","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cinttypesifspar2-command-and-auxillary-field-i-am-confused\/","title":{"rendered":"CINT,TYPE,SIFS,Par2 command and auxillary field; I am confused!"},"content":{"rendered":"

<p>Hi all,<br><br>2.4. Fracture-Parameter Calculation Types<\/a><br>provides us with an explanation for the CINT command and the use of the interaction integral implemented in ANSYS.<br>Can someone please explain to me whether the following description is contradictory or whether it is a misunderstanding on my part. Is the SIF at the end nodes now calculated via plane-stress or plane-strain? <br><br>Thanks in advance<br><br>Ferdinand<br><br>Quote:<\/p><div class=”titlepage”><div><div><h4 class=”title” style=”padding-left: 40px;”>2.4.2.3. Selecting Auxiliary Crack-Tip Stress Fields<\/em><\/h4><\/div><\/div><\/div><p style=”padding-left: 40px;”>[…]<\/em><\/p><p style=”padding-left: 40px;”>For 3D crack models, Mechanical APDL determines whether a crack is <span class=”emphasis”>closed<\/span> or <span class=”emphasis”>open<\/span>. In a closed crack, the end-points of the crack front are the same (for example, a penny-shaped crack). In an open crack, the end-points of the crack front are distinct (for example, an edge crack in a compact-tension specimen).<\/em><\/p><p style=”padding-left: 40px;”>For closed cracks, plane-strain auxiliary fields are used in the SIFS calculations.<\/em><\/p><p style=”padding-left: 40px;”>For an <span style=”background-color: #e03e2d;”>open crack front,<\/span> <span style=”background-color: #e03e2d;”>plane-stress auxiliary fields are used at the end nodes<\/span> of the crack front, while plane-strain auxiliary fields are used at the interior nodes during the SIFS calculations.<\/em><\/p><p style=”padding-left: 40px;”>For an <span style=”background-color: #e03e2d;”>open crack, you can control the behavior of auxiliary fields<\/span> via <span class=”replaceable”>Par2<\/code><\/span> on the <span class=”command”>CINT<\/a><\/strong><\/span> command (<span class=”command”>CINT<\/a><\/strong><\/span>,TYPE,SIFS,<span class=”replaceable”>Par2<\/code><\/span> command):<\/em><\/p><div class=”itemizedlist” style=”padding-left: 40px;”><\/p>\n