F.E.M. 1.001 (3^rd, 1998)

F.E.M. 1.001 (3^rd, 1998) performs the static stress check and fatigue check for the steel structures of crane and crane equipment. Fatigue calculations are performed according to the Allowable Stress Design method (ASD).

F.E.M. 1.001

To add F.E.M. 1.001 standard execute Standards - Main - Other - F.E.M. 1.001 (3^rd, 1998) from the ribbon:

Standards_FEM

Press to Set Standard Custom Settings

To perform the fatigue check three classifications should be defined: Weld Type, Element Group and Material Type.

Weld Type - also called Notch Case, determines which elements belong to what weld type (K0-K4 - joints affected by welding, W0-W2 - elements and joints, not affected by welding). Weld Type depends on the shape, structural design, whole pattern or type and quality of the welds.

Element Group - depends on the Load Spectrum and Class of Utilization (number of cycles). Can be set from E1 to E8.

Load Spectrum:

The load spectrum characterizes the magnitude of the load acting on the component during its total duration of use.

Load Spectrum			Remarks
P0	Very light	P=0	Crane by exception loaded with the working load, and as a rule, with very light loads
P1	Light	P=1/3	Crane sometimes loaded with the working load, and as a rule with loads of about 1/3 of the working load
P2	Moderate	P=2/3	Crane repeatedly loaded with the working load, and as a rule with loads between 1/3 and 2/3 of the working load
P3	Heavy	P=1	Crane frequently loaded with the working load

Class of utilization (number of cycles):

Symbol	Total duration of use number n of stress cycles)
B0			n	≤	16 000
B1	16 000	<	n	≤	32 000
B2	32 000	<	n	≤	63 000
B3	63 000	<	n	≤	125 000
B4	125 000	<	n	≤	250 000
B5	250 000	<	n	≤	500 000
B6	500 000	<	n	≤	1 000 000
B7	1 000 000	<	n	≤	2 000 000
B8	2 000 000	<	n	≤	4 000 000
B9	4 000 000	<	n	≤	8 000 000
B10	8 000 000	<	n

Element Group (Table T.2.1.4.4):

Stress Spectrum class	Class of utilization
Stress Spectrum class	B0	B1	B2	B3	B4	B5	B6	B7	B8	B9	B10
P1	E1	E1	E1	E1	E2	E3	E4	E5	E6	E7	E8
P2	E1	E1	E1	E2	E3	E4	E5	E6	E7	E8	E8
P3	E1	E1	E2	E3	E4	E5	E6	E7	E8	E8	E8
P4	E1	E2	E3	E4	E5	E6	E7	E8	E8	E8	E8

Material Type - define which steel is used St37 or St52.

Standard uses material data (Yield/Tensile) in calculations. Wizard checks if the values are defined for all materials.

By default, the full model is set for the selection, but it is possible edit the selection.

Press Button_gamma to define safety factors for static stress check for individual loads and loads sets should be defined:

Use Hot Spot Stress - use Hot Spot Stress results for locations defined in Weld Finder Tool or Weld Stress results in the fatigue checks.

The fatigue calculations (2..Fatigue) are performed on Load Group only, stress range from load group is required. Check "3..Fatigue Summation" performs additional calculations and sum damage from different load groups based on stress history defined in Fatigue Group.

Standards_FEM_menu

Include Rainflow Counting - include rainflow fatigue summation check with defined result category and method from which Rainflow Counting data will be used.

Note: category options for fatigue are Weld Stress or Hot Spot Stress.

Note: this option is available only for Enterprise licensing.