SS-V: 7000 SN Uniaxial Fatigue

Test No. VF01Find the fatigue life when a stress life fatigue analysis is performed on a notched specimen subjected to tensile loading.

Definition

Figure 1.


The material properties are:
Properties
Value
Modulus of Elasticity
2.03e5 MPa
Poisson's Ratio
0.3
Ultimate tensile strength (UTS)
863 MPa
Fatigue strength coefficient (SR1)
1101.0 MPa
First fatigue strength exponent (b1)
-0.075
Cycle limit of endurance for one segment SN curve (NC1)
1e6 cycles

Boundary Conditions

Test specimen is subjected to tensile loading of 1000N at circular holes. Signed von Mises combined stress is used. The loading from structural analysis variation over time is shown in the table below.
Time (sec)
Amplitude factor
0
0
1
1
2
0
3
-1
4
0
No modifying factors (surface roughness and fatigue strength reduction factor) are used.

Results

Figure 2.


The following table summarizes fatigue life at reference point.
Coordinates Reference1 SimSolid
Point 1 [33.451,4.1929,-64.493] 16200 16146.7
1 SimSolid results are compared with efatigue calculator.