Base Metal Evaluation Support


	Fatigue		Static
Regulation	Shell Elemental and nodal evaluation	Solid Nodal evaluation only	Shell Elemental and nodal evaluation	Solid Nodal evaluation only
DVS1612	No	No	No	No
DVS1608	No	No	No	No
FKM	Yes	Yes	Yes	Yes
EuroCode 3	Yes	Yes	No	No
ERRI B12 RP60	Yes	Yes	No	No
IEC	Yes	No	No	No
Stress Life (SN)	Yes	Yes	No	No

Note: Nodal evaluation uses corner data stress for evaluation.

Analysis Location

HyperLife supports fatigue evaluation using:

Shell elements: either elemental (centroidal) stress or corner stress.
Solid elements: corner stress only.

Element-Based Evaluation

For element-based evaluation, HyperLife evaluates fatigue at the element centroid, using the stress tensor at the specified evaluation distance.

Node-Based Evaluation

For nodal fatigue analysis, HyperLife uses averaged corner stress data at each node. For solid elements, evaluation is limited to surface nodes. The averaged corner stress is projected onto an imaginary plane to obtain a plane stress state, which is used for damage calculations.

Imaginary Plane Orientation

The normal (z-axis) of the imaginary plane is the average normal of all free faces connected to a node. The local x-axis is the cross product of the basic coordinate system's z-axis and the imaginary plane’s z-axis. If both z-axes are parallel, the local x-axis is taken from the basic coordinate system’s x-axis. The local y-axis is computed as the cross product of the local z-axis and local x-axis.