| Load case | Stress concentration | Crack initiation site | |-----------|----------------------|------------------------| | Tension perpendicular to plane | Pores/voids >100 µm | Mid-cell | | In-plane shear | Cell strut junctions | Triple points | | Flexure of sandwich panel | Core shear + facing indentation | 1–2 mm below skin |
Devfus foam requires a specific curing range (usually 60°F to 85°F / 15°C to 29°C). If the foam is applied in a cold environment and then suddenly exposed to heat (e.g., direct sunlight or HVAC heat), thermal expansion and contraction cause temperature-induced cracking.
Signs: Hairline, spider-web cracks radiating outward.
Devfus foam is flexible but not elastic like silicone. If you apply it across a dynamic joint (e.g., between two wood studs that expand/contract with seasonal humidity), the foam will eventually tear. This is a shear crack.
Signs: Crescent-shaped cracks near the adhesion lines.
For gaps deeper than 2 inches, insert a backer rod (closed-cell foam rope) before applying Devfus foam. This reduces the volume of foam required and prevents over-expansion cracking.
| Load case | Stress concentration | Crack initiation site | |-----------|----------------------|------------------------| | Tension perpendicular to plane | Pores/voids >100 µm | Mid-cell | | In-plane shear | Cell strut junctions | Triple points | | Flexure of sandwich panel | Core shear + facing indentation | 1–2 mm below skin |
Devfus foam requires a specific curing range (usually 60°F to 85°F / 15°C to 29°C). If the foam is applied in a cold environment and then suddenly exposed to heat (e.g., direct sunlight or HVAC heat), thermal expansion and contraction cause temperature-induced cracking.
Signs: Hairline, spider-web cracks radiating outward.
Devfus foam is flexible but not elastic like silicone. If you apply it across a dynamic joint (e.g., between two wood studs that expand/contract with seasonal humidity), the foam will eventually tear. This is a shear crack.
Signs: Crescent-shaped cracks near the adhesion lines.
For gaps deeper than 2 inches, insert a backer rod (closed-cell foam rope) before applying Devfus foam. This reduces the volume of foam required and prevents over-expansion cracking.
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