DNV CN30 Plate Buckling (1995)

The DNV CN30 Plate Buckling (1995) standard assesses local plate stability under in-plane stresses using serviceability and ultimate strength limits. SDC Verifier automates this verification based on plate geometry and converted FE stresses, aligned with the 1995 DNV Rules for Ships.

This standard is designed to ensure structural stability at both individual element level and panel level, considering both critical elastic buckling and von Mises equivalent stress states.

Core Features in SDC Verifier:

• Automatic plate and section recognition via Panel Finder
• Plate stress extraction methods: • Midplane (no bending) • Element average • Plate average (with optional conservative absolute shear)
• Supports element-wise calculation using actual plate dimensions (length, width, thickness) or user-defined overrides
• Buckling criteria output:
  • Ultimate Strength Limit ≤ 1
  • Buckling State Limit ≤ 1

Stress Translation & Direction:

• Sx, Sy, Txy stresses converted to local plate axes
• Element-level buckling stress input supports: • Midplane • Average stress • Conservative absolute shear stress (for plate-averaged results)

Serviceability vs Ultimate Checks:

• Serviceability limit based on characteristic buckling stress
• Ultimate capacity checks follow von Mises formulation with equivalent reduced slenderness
• Both single-reference and combined stress states are supported

Design Outcome: This standard helps engineers determine whether existing plating dimensions are acceptable or if reinforcement is needed. When deformation/fatigue is not an issue, it also supports ultimate capacity checks of plates between stiffeners.