Non-Relaxing Fatigue Model
Under nonrelaxing loads, some elastomers exhibit enhanced fatigue life / slowed crack growth due to strain crystallization effects. The effect is measured using crack arrest experiments in which a crack growing initially under fully relaxing loads is gradually operated under increasingly nonrelaxing loads. This information is required when constructing rubber’s Haigh diagram for a crystallizing material.
Recommended for cases where cyclic minimum loading is greater than zero and material may strain crystallize.
Test is run under a range of nonrelaxing (R > 0) conditions.
Note: It is required to run FPM-C in order to run this Module
Experiment Overview
- fatigue crack growth arrest procedure with minimum strain sweep
- number of slabs needed for test: 1
Analysis and Reporting / Deliverables
- crack arrest history c(N) for nonrelaxing cycles
- strain crystallization functions F(R) and x(R)
- Haigh diagram showing sensitivity to minimum strain of crack nucleation life
Use with:
- Mars-Fatemi Strain Crystallization Law
- X(R) Strain Crystallization Law
