Mandrel / Core Strength

Extrusion pressure p (MPa)

Loaded area A (mm²)

Number of support pillars

Pillar diameter d (mm)

Allowable stress [σ] (MPa)

Load per pillar F–

Compressive stress σc–

Safety factor–

Check: F = (p·A)/n ; σ = F/(π·d²/4) ≤ [σ]

Allowable stress for H13 ≈ 400–480 MPa at operating temperature (yield based).

Actual load F (kN)

Mandrel overhang length L (mm)

Mandrel root diameter d (mm)

Elastic modulus E (MPa)

Allowable stress [σ] (MPa)

Moment of inertia I–

Euler critical load Fcr–

Stability safety factor–

Section modulus Wx–

Bending moment M–

Bending stress σb–

Fcr = π²·E·I/L² ; σb = F·L/Wx

Allowable stress for H13 ≈ 400–480 MPa at operating temperature (yield based).