A Goodman diagram is a graphical representation of the fatigue life of a material under varying stress amplitudes. The modified Goodman diagram is a variation of the Goodman diagram that takes into account the mean stress of the loading.To graph a modified Goodman diagram in Excel, you can follow these steps:1. Enter the fatigue data into two columns in Excel. The first column should contain the stress amplitude, and the second column should contain the number of cycles to failure.2. Select the data and click on the “Insert” tab.3. Click on the “Scatter” chart type and select the “XY Scatter” option.4. Right-click on one of the data points and select “Add Trendline.”5. In the “Trendline” dialog box, select the “Modified Goodman” option.6. Click on the “Options” tab and select the “Display Equation on chart” option.7. Click on the “OK” button.The modified Goodman diagram will be displayed on the chart. The equation of the Goodman line will be displayed on the chart, and you can use this equation to predict the fatigue life of the material under different loading conditions.
The modified Goodman diagram is a useful tool for predicting the fatigue life of materials. It is a relatively simple diagram to create, and it can provide valuable information about the fatigue behavior of a material.
