FKM (5th, 2003)

FKM-Guideline (5th Edition, 2003) — formally Rechnerischer Festigkeitsnachweis von Maschinenbauteilen — provides a robust methodology for verifying the static and fatigue strength of components in mechanical engineering.

Implemented in SDC Verifier:

• Static strength and fatigue checks
• Based on component type (1D/2D/3D), material class, weld type, and loading history
• Applicable to steel, cast steel, cast iron, aluminum, and cast aluminum

Key configuration areas:

Material and Geometric Inputs

• Kind of material (steel, GG, etc.)
• Yield and tensile properties (RmZ)
• Effective diameter (Deff)
• Surface roughness and coating impact
• Residual stress condition (high/medium/low)

Welded Joint Evaluation

• FAT classes from Tables 5.4.1 and 5.4.2
• Weld types (transverse/longitudinal)
• Thickness effects for welds >25 mm
• Use of Hot Spot Stress or Weld Stress

Fatigue-Specific Factors

• Stress gradient (auto-calculated or defined)
• Temperature and surface treatment adjustment
• Safety factors based on severity and inspection intervals
• Overload type and plastic notch factor

FKM enables highly detailed control for stress verification under both constant and variable amplitude loading, making it essential for precision engineering, rotating machinery, and structural components in demanding environments.