_fat.#.eqsts file
An OptiStruct ASCII format results file.
File Creation
This file is created when the OPTI format is chosen in EQSTSAMP I/O Options Entry for Fatigue Analysis. The # is the corresponding Fatigue subcase ID and separate .eqsts files are created for multiple Fatigue Subcases (Refer to the I/O Options, EQSTSAMP, FORMAT and OUTPUT).
File Contents
This file contains Equivalent Stress Amplitude and corresponding Equivalent Number of Cycles for each Fatigue subcase. The information is printed as a single table for all/SID elements in the model (for EQSTSAMP(OPTI)=ALL/SID). The printed tables vary in content depending on the type of Fatigue solution being run. Currently, .eqsts file output is supported for SN and EN Static and Transient Fatigue analyses only.
Format
Figure 1.
- Elem ID
- The header at the top of the table consists of the Element ID of consideration.
- Damage
- The value of damage for each element.
- Eq. no. cycles
- Indicates the equivalent number of cycles for each element.
- Eq. stress amp.
- Equivalent Stress amplitude for each element represents the single constant value of stress that is equivalent to the stress that causes the same damage that occurs based on the multiple load cycles from rainflow counting.
- Angle (Deg.)
- Indicates the angle in multiaxial fatigue analysis of the critical plane at which the damage value is output.