Safety tools in ANSYS® Mechanical are very important and very useful tools to see safety situations at your analyses. You need to select a proper safety tool to see your part’s or material’s safety situation according to boundary conditions that are applied. Here we explain what is maximum tensile stress safety tool is and how to apply it in ANSYS® Mechanical.
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What Is Maximum Tensile Stress Safety Tool?
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This theory states that, if the maximum principal stress that occurs on a material or part exceeds the yield strength of that material, failure occurs. Yield stress value can be divided by a safety factor, which depends on your application.
For brittle materials, compressive strength is much higher than tensile strength. If there is compressive stress on a brittle material, this situation must be treated in another way. Also, it is not recommended to use the tensile characteristics of a brittle material such as concrete or ceramics because their tensile strength value can not be determined accurately because of their brittle nature.
You can define required concentration factors(such as Kt) according to stress risers in your brittle material such as corners, inhomogeneities. This concentration factor must be multiplied by the tensile stress that occurs in your application.
With the consideration of logical concentration factors and safety factors in Maximum Tensile Stress theory, it can give good results for static loadings on brittle materials.
How To Calculate Maximum Tensile Stress Theory In ANSYS® Mechanical?
You can define ‘Max Tensile Stress’ from the ‘Solution’ section in ANSYS® Mechanical. Right-click on ‘Solution’, hover your mouse on ‘Insert’ then hover your mouse on ‘Stress Tool’ as shown by the red arrow above. Then select ‘Max Tensile Stress’ as in the red box in ANSYS® Mechanical.
You can evaluate the safety situation with three options. You can select one of these options as shown above. Right-click on ‘Stress Tool’ that you recently added, Insert>Stress Tool then select one of ‘Safety Factor’, ‘Safety Margin’, ‘Stress Ratio’ options in ANSYS® Mechanical.
Fs means factor ıf safety, Slim is the tensile strength of your material. Sigma1 is the maximum principal stress that is applied to your part. Ms is also a safety margin. Sigma1(prime) is the stress ratio.
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NOTE: All the screenshots and images are used for educational and informative purposes. Images used courtesy of ANSYS, Inc.