*S-N CURVE |
 
|
*S-N CURVE |
|
To define S-N curves to be used in SHEAR7 analysis.
Refer to SHEAR7 Data Specification for further information on this feature. For more information, refer to the Shear7 User Guide which is available for download from the Shear7 Support web page.
Blocks of lines that define an S-N curve repeated as often as necessary. Each block begins with a line defining the S-N curve name and endurance limit. This is then followed by lines to define the S-N curve.
Line to define S-N curve name and type:
CURVE=S-N Curve Name, ENDURANCE_LIMIT=Stress Range
Lines to define a curve directly in terms of (S, N) data pairs (the line is repeated as often as necessary):
S, N
The whole block can be repeated to define multiple curves.
Input: |
Description |
Curve Name: |
A unique name for the S-N curve. See Note (a). |
Endurance Limit: |
A stress range value below which no fatigue damage occurs, regardless of the number of cycles. The default value is 0. |
S: |
A stress range value. See Note (a). Stress ranges are considered to be ksi for imperial units and pascals for metric units. |
N: |
The number of cycles to cause failure at this stress range. See Note (a). |
(a)As many as 10 segments can be used to define a particular S-N curve. It should be noted that for a single segment S-N curve. There are 2 S-N pairs required, for 2 segments S-N curve it is required to have 3 S-N pairs, etc. On a log-log plot the SN curve is assumed to be linear between these points. The stress range for the different points must be in increasing order. See the SHEAR7 User Manual for further details.