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--- commit:2018:08_17 [2018/08/16 10:45] – boemer
+++ commit:2018:08_17 [2018/08/17 23:15] (current) – [Added [a] / deleted [d] / modified [m] / renamed [r] test cases] boemer
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 {{ :commit:2018:08_17:tractionattransition.png?600 |}}
+===== Test cases =====
 The tests
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 {{ :commit:2018:08_17:contacttraction2delement.png?600 |}}
+In a test case, 5 squares (or cubes in 3D) are crushed by a compressive pressure due to the TractionElement or ContactTractionElement and a descending contact tool (either edge or plane).  The 3D test case is the natural extension of the 2D case (i.e. out-of-plane extrusion).  The contact will either be partial, i.e. with a transition from contact to no contact, or full, i.e. without such a transition.  Hence, the contact state (transition or not), the traction element (TractionElement or ContactTractionElement) and the transition treatment (TRACTION_AT_TRANSITION_ON) will impact the external forces at nodes $P_{4}$, $P_{14}$, $P_{24}$, $P_{34}$, $P_{44}$.
+Let's denote by $F_{t_{1}}$, $F_{t_{2}}$, $F_{t_{3}}$, $\ldots$ and $F_{c_{1}}$, $F_{c_{2}}$, $F_{c_{3}}$, $\ldots$ the total and contact forces along $\mathbf{y}$ at the previous nodes.  The following conditions are then tested in the extractors:
+  * $F_{t_{1}} - F_{t_{2}} = 0$, correct implementation at transition
+  * $F_{t_{2}} - F_{c_{2}} \neq 0$, correct implementation at transition, pressure force not zero
+  * $F_{t_{3}} - F_{c_{3}} = 0$, pressure force set to zero at transition
+  * $F_{t_{4}} - F_{c_{4}} = 0$, pressure force set to zero since no transition
+  * $F_{t_{5}} - F_{c_{5}} = 0$, pressure force set to zero since no transition
+===== Added [a] / deleted [d] / modified [m] / renamed [r] test cases ======
+<code>
+[m] mtContact/tests/contactTraction2DElement.py
+[m] mtContact/tests/contactTraction3DElement.py
+</code>
+ --- // [[dominik.boemer@uliege.be|Dominik Boemer]] 2018/08/17 23:15 //