When you use small mesh densities, large differences can occur in the exact values.
It may then be necessary to turn on automatic refining or to refine the stress differences manually after the first pass through the calculation.
Forces and supports are never exerted on a single point, but over an area. If you use only single forces and supports and maximum stress, you may get high, unrealistic point stresses precisely at their insertion points, particularly as the mesh is refined. Therefore you must be careful when using values for the maximum stress. When you use force and support lines, the stress values approximate accurate values.
- "Warm" colors do not always have to depict the maximum stress.
- Stress in the X, Y, and Z directions and shear stress can also assume negative values. Color values for stress are assigned mathematically based on the interval.
Example: An isoline with a "cold" color has the value -80, an isoline with a "warm" color has the value 5. However the maximum value is -80. So, you cannot rely on the optical color representation. Therefore, it is necessary to interpret the stress lines together with the result block.
The main stress 1 is the highest, the main stress 2 the lowest stress in this point. Stresses can change with the angle.
The main stress 1 always is arithmetically higher than the main stress 2. Positive values represent the extension stress, negative values represent the compression stress. But both may be negative.
Example:
Main stress 2 < Main stress 1
-800 < -400
In this case, the main stress 2 is higher than the main stress 1 (but the arithmetical principle is valid as convention).