What is the shear buckling failure mode of sandwich panels? How to increase the critical shear stress?

When the core shear modulus is low, the facings may develop wavy buckling in the compression zone (“accordion mode”). Critical shear stress τ_cr = k * √(E_f * E_c * t_f / t_c), proportional to the square root of core shear modulus and facing stiffness. Enhancement methods: 1) Increase facing thickness; 2) Choose high-modulus core (PET over PU); 3) Use corrugated core or add longitudinal stiffeners; 4) Reduce panel span or add web supports. In practice, for a common 8-meter span roof panel, if core shear modulus <10 MPa (e.g., low-density PU), the facing must be increased from 0.5mm to 0.7mm to resist buckling.

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What is the shear buckling failure mode of sandwich panels? How to increase the critical shear stress?

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