Linear Traction Law

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 (&delta_c), 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:

Property	Description	Units	Default
kIe	The elastic slope, k, in mode I	MPa/mm	0
kIIe	The elastic slope, k, in mode II	MPa/mm	0