HL-V: 0010 Constant Amplitude Stress-Life Analysis
A notched test specimen is subjected to tensile loading and a Constant Amplitude Stress-Life Analysis is performed using HyperLife.
The Stress-Life result from HyperLife is compared with the results from eFatigue calculator, for the element 215576.
Model Files
Before you begin, copy the file(s) used in this problem to your working directory:
Benchmark Model
The model is a test specimen of thickness 9.5 mm, subjected to tensile loading of 1150 N at circular holes, normal to the notch. The model was meshed with first-order shell elements and the loading is applied to RBE3 elements that are connected to the holes. The Signed Von Mises (SGVON) combined stress was used.
The material used is Steel RQC-100:
| Material Property | Value |
|---|---|
| Young's modulus | 203000 MPa |
| Poisson's ratio | 0.3 |
| Ultimate tensile strength (UTS) | 863.0 MPa |
| Fatigue strength coefficient (SRI1) | 1101.0 MPa |
| First fatigue strength exponent (B1) | -0.075 |
| Cycle limit of endurance for one segment SN curve (NC1) | 1000000 cycles |
A constant amplitude load is applied in the FATLOAD entry with a scale factor of
14.1332, whose variation is:
| Time Points | Load Curve Point |
|---|---|
| 0 | 0.0 |
| 1 | 1.0 |
| 2 | 0.0 |
| 3 | -1.0 |
| 4 | 0.0 |
All the modifying factors (Surface Roughness and Fatigue Strength Reduction factor) are set to 1.0.
Results
Comparison of the Stress-Life results between HyperLife and eFatigue calculator for
element 215576.
| Result | eFatigue (Target Value) | Hyperlife | Normalized with the Target Value |
|---|---|---|---|
| Life (Nf) | 152000 cycles | 151881 cycles | 1.0008 |