Difference between revisions of "Linear Traction Law"
Jump to navigation
Jump to search
| Line 8: | Line 8: | ||
== Failure == | == Failure == | ||
This traction does not fail or release energy; as COD increases, the traction keeps increasing. If you want to model failure, use a [[Triangular Traction Law|trangular traction law]] instead. For example, to model a linear law that suddenly drops to zero stress at some critical COD, use a [[Triangular Traction Law|trangular traction law]] with the same elastic slope, enter the critical COD (&delta<sub>c</sub>), and set its [[Triangular Traction Law#Traction Law Properties|delpkI and/or delpkII parameters]] to 1. The toughness of this law would be | This traction does not fail or release energy; as COD increases, the traction keeps increasing. If you want to model failure, use a [[Triangular Traction Law|trangular traction law]] instead. For example, to model a linear law that suddenly drops to zero stress at some critical COD, use a [[Triangular Traction Law|trangular traction law]] with the same elastic slope, enter the critical COD (δ<sub>c</sub>), and set its [[Triangular Traction Law#Traction Law Properties|delpkI and/or delpkII parameters]] to 1. The toughness of this law would be | ||
| | ||
Revision as of 21:04, 2 January 2021
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 (δc), and set its delpkI and/or delpkII parameters to 1. The toughness of this law would 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 | pressure/length units | 0 |
| kIIe | The elastic slope, k, in mode II | pressure/length units | 0 |