Linear Traction Law
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The Traction Law
This traction law applies a linearly increasing stress and it never fails.
Failure
This traction does not fail or release energy; as COD increases, the traction keeps increasing. If you want to model failure, use a |trangular traction law instead. For example, to model a linear law that suddenly drops to zero stress at some critical COD, use a |trangular traction law with the same elastic slope, enter the critical COD (&deltac), and set its delpkI and/or delpkII parameters to 1. The toughness of this law will be
[math]\displaystyle{ J_c = {1\over 2} k \delta_c^2 }[/math]
Traction Law Properties
The following properties are used to create a linear traction law:
| kIe | The elastic slope, k, in mode I | MPa/mm | none |
| kIIe | The elastic slope, k, in mode II | MPa/mm | none |