.#.rnf file

For Static Analysis, the printed tables are different depending on if SN or EN Fatigue is being conducted.

Figure 1. Example: Table for Static Analysis (SN)

For Static analysis SN, the following data are printed in the table.

Element ID

The header at the top of the table consists of the Element ID of consideration.

Event ID

The first line under Element header indicates the ID of the FATEVNT Bulk Data Entry and in parentheses lists the counter of the current FATEVNT under consideration out of the total number of FATEVNT entries.

Number of Cycles

Number of Rainflow cycles detected for the current Element in the current FATEVNT.

Cycle ID

Rainflow Cycle ID

Stress Amplitude

Stress ampitude of the current Cycle

Mean Stress

Mean stress of the current Cycle

Damage

Damage value of the current Cycle

For each cycle, two points of the load time history are required to fully identify a complete cycle. For instance, one cycle is from TABFAT_pt1 → TABFAT_pt2 → TABFAT_pt1.

TABFAT_pt1

First point of the load time history for the current cycle

TABFAT_pt2

Second point of the load time history for the current cycle

Example: Table for Static Analysis (EN)

For EN Fatigue, the table printed varies depending on the damage model used.

Figure 2. EN Static Fatigue (SWT)

Figure 3. EN Static Fatigue (MORROW)

For Static analysis EN, the following data are printed in the table

Element ID

The header at the top of the table consists of the Element ID of consideration.

Event ID

The first line under Element header indicates the ID of the FATEVNT Bulk Data Entry and in parentheses lists the counter of the current FATEVNT under consideration out of the total number of FATEVNT entries.

Number of Cycles

Number of Rainflow cycles detected for the current Element in the current FATEVNT.

Cycle ID

Rainflow Cycle ID

Strain Amplitude

Strain ampitude of the current Cycle

Max Stress (SWT)

Max stress of the current Cycle

Mean Stress (MORROW)

Mean stress of the current Cycle

Damage

Damage value of the current Cycle

For each cycle, two points of the load time history are required to fully identify a complete cycle. For instance, one cycle is from TABFAT_pt1 → TABFAT_pt2 → TABFAT_pt1.

TABFAT_pt1

First point of the load time history for the current cycle

TABFAT_pt2

Second point of the load time history for the current cycle

For Sine Sweep Fatigue Analysis, the printed tables are different depending on if SN or EN Fatigue is conducted.

Figure 4. Example: Table for Sine Sweep Fatigue Analysis (SN)

For Sine Sweep SN, the following data are printed in the table.

Element ID

The header at the top of the table consists of the Element ID of consideration.

Event ID

The first line under Element header indicates the ID of the FATEVNT Bulk Data Entry and in parentheses lists the counter of the current FATEVNT under consideration out of the total number of FATEVNT entries.

Number of Frequencies

Number of Frequencies in Sine Sweep Fatigue Analysis for the current subcase.

Freq ID

Number/ID of the current frequency of interest in the table

Number of Cycles

Number of cycles of the particular frequency of interest

Stress Amplitude

Stress ampitude of each Cycle at the current frequency

Mean Stress

Mean stress of each Cycle at the current frequency

Damage

Cumulative damage value of the current Cycle at the current frequency

Example: Table for Sine Sweep Fatigue Analysis (EN)

For EN Fatigue, the table printed varies depending on the damage model used.

Figure 5. EN Sine Sweep Fatigue (SWT)

Figure 6. EN Sine Sweep Fatigue (MORROW)

For Sine Sweep EN, the following data are printed in the table.

Element ID

The header at the top of the table consists of the Element ID of consideration.

Event ID

The first line under Element header indicates the ID of the FATEVNT Bulk Data Entry and in parentheses lists the counter of the current FATEVNT under consideration out of the total number of FATEVNT entries.

Number of Frequencies

Number of Frequencies in Sine Sweep Fatigue Analysis for the current subcase.

Freq ID

Number/ID of the current frequency of interest in the table

Number of Cycles

Number of cycles of the particular frequency of interest

Strain Amplitude

Strain ampitude of each Cycle at the current frequency

Max Stress (SWT)

Max stress among all Cycles at the current frequency

Mean Stress (MORROW)

Mean stress of all Cycle at the current frequency

Damage

Damage value of the worst damage Cycle at the current frequency

For Random Response Fatigue Analysis, the printed tables are different depending on if SN or EN Fatigue is conducted.

Figure 7. Example: Table for Random Response Fatigue Analysis (SN)

Note: For all Damage models, the printed value in the Prob. Column is the actual Probability value (not the Probability Density Function value).

For Random Response SN, the following data are printed in the table.

Element ID

The header at the top of the table consists of the Element ID of consideration.

Event ID

The first line under Element header indicates the ID of the FATEVNT Bulk Data Entry and in parentheses lists the counter of the current FATEVNT under consideration out of the total number of FATEVNT entries.

Number of Stress Amplitudes

Number of Stress Amplitudues in Random Response fatigue analysis for the current subcase.

DIRLIK/LALANNE/NARROW/THREE

Random Response Damage model used

Stress ID

Number/ID of the current stress amplitude of interest in the table

Prob

Probability of occurrence of the corresponding stress amplitude

Number of Cycles

Number of cycles of the particular stress amplitude

Mean Stress

Mean stress of each Cycle at the current stress amplitude

Damage

Cumulative damage value of all Cycles at the current stress amplitude

Example: Table for Random Response Fatigue Analysis (EN)

For EN Fatigue, the table printed varies depending on the damage model used.

Figure 8. EN Random Response Fatigue (SWT)

Figure 9. EN Random Response Fatigue (MORROW)

For Random Response EN, the following data are printed in the table.

Element ID

The header at the top of the table consists of the Element ID of consideration.

Event ID

The first line under Element header indicates the ID of the FATEVNT Bulk Data Entry and in parentheses lists the counter of the current FATEVNT under consideration out of the total number of FATEVNT entries.

Number of Strain Amplitudes

Number of Strain Amplitudues in Random Response fatigue analysis for the current subcase.

DIRLIK/LALANNE/NARROW/THREE

Random Response Damage model used

Strain ID

Number/ID of the current strain amplitude of interest in the table

Prob

Probability of occurrence of the corresponding strain amplitude

Number of Cycles

Number of cycles of the particular strain amplitude

Mean Stress (SWT)

Mean stress of each Cycle at the current strain amplitude

Max Stress (MORROW)

Max stress of each Cycle at the current strain amplitude

Damage

Cumulative damage value of all Cycles at the current strain amplitude

For Multiaxial Analysis, the printed tables are different depending on if SN or EN Fatigue is being conducted.

Example: Table for Static Analysis (SN)

For Multiaxial Fatigue, the Damage model also influences the type of table printed in the .rnf file.

Figure 10. Goodman Damage Model

For Static analysis SN, with Goodman damage model, the following data are printed in the table.

Element ID

The header at the top of the table consists of the Element ID of consideration.

Event ID

The first line under Element header indicates the ID of the FATEVNT Bulk Data Entry and in parentheses lists the counter of the current FATEVNT under consideration out of the total number of FATEVNT entries.

Number of Cycles

Number of Rainflow cycles detected for the current Element in the current FATEVNT.

Cycle ID

Rainflow Cycle ID

Normal Stress Amplitude

Stress ampitude of Normal Stress for the current Cycle

Mean Stress

Mean stress of the current Cycle

Damage

Damage value of the current Cycle. For multiaxial fatigue, the reported damage is the worst damage out of all damages calculated for planes rotated by 10 degrees. The plane with maximum damage at each location is called the critical plane and this is reported.

Damage Model

Damage model being used for this Cycle, and additionally also lists the critical plane determined to have the maximum damage (possible planes are T0, A0, A45, B45).

Figure 11. Findley Damage Model

For Static analysis SN, with Findley damage model, the following data are printed in the table.

Element ID

The header at the top of the table consists of the Element ID of consideration.

Event ID

The first line under Element header indicates the ID of the FATEVNT Bulk Data Entry and in parentheses lists the counter of the current FATEVNT under consideration out of the total number of FATEVNT entries.

Number of Cycles

Number of Rainflow cycles detected for the current Element in the current FATEVNT.

Cycle ID

Rainflow Cycle ID

Shear Stress Amplitude

Stress ampitude of Normal Stress for the current Cycle

Normal Stress

Normal stress for the current Cycle

Damage

Damage value of the current Cycle. For multiaxial fatigue, the reported damage is the worst damage out of all damages calculated for planes rotated by 10 degrees. The plane with maximum damage at each location is called the critical plane and this is reported.

Damage Model

Damage model being used for this Cycle, and additionally also lists the critical plane determined to have the maximum damage (possible planes are T0, A0, A45, B45).