S-N curve derivation

The dialogue started after this command is selected can be seen below. A selected input file is visible at the top. The expected inputs are tables, where the individual items are separated by blank spaces or tabulators. The content of individual columns and rows is uknown at first, so the columns and rows are only number. The user inputs, whether the stresses (S) and numbers of cycles (N) are recorded in columns or rows and then selects the appropriate cells, from which will be the S-N curve derived, by typing the numbers to the fields in the middle part of the interface.

It is possible to copy the content of individual cells in the table to a clipboard by selecting the appropriate cells by mouse and a use of either Ctrl+C combination or choosing the command from the right-hand click menu.

The table is locked and cannot be edited, unless the Edit data button is pressed. If another file has to be read into the table, the Read File button can be used.

Before the Analyze button is pressed, make sure that the decimal character (either dot or comma) in the table is in conformable the local Windows preferences (let any result file or node description be viewed and you will see immediately your local preferences).

The resulting values after the analysis are given in the table at the bottom and can be again copied to the clipboard. Their meaning is (see also S-N curve help item):

* W - exponent of the S-N curve (w in S-N curve)

* WK_RHS - constant on the right hand side of the S-N curve (C in S-N curve)

* S_LOGN - standard deviation of decimal logarithm of number of cycles (note that [RF00] report its maximum allowable value 0.15 for aircraft structures - otherwise an adequate decrease of the S-Ncurve would be necessary)

* S_LOGS - standard deviation of decimal logarithm of stresses

A report about the analysis is also recorded to the report window:

g3data - nice freeware tool for retrieval of values from scanned graphs

S-N curve

This help file has been generated by the freeware version of HelpNDoc