Impact resistance determines how well a sandwich panel can absorb sudden energy without catastrophic failure. In real-world applications, panels are frequently exposed to:
- Tool drops
- Debris strikes
- Transportation vibration
- Foot traffic
- Hail impact
- Collision loads
When impact occurs, the face sheet distributes the force while the foam core absorbs and dissipates energy through controlled deformation.
PVC foam generally offers excellent impact fatigue resistance because of its toughness and elastic recovery behavior. PET foam also performs well under repeated impacts due to its stable mechanical structure.
XPS foam, although lightweight, is relatively brittle under concentrated loads and may crack or crush more easily.
PU foam behavior depends heavily on density and formulation. Flexible PU absorbs energy effectively, while rigid PU prioritizes insulation performance.
Engineering evaluation often includes:
- Drop-weight impact testing
- Compression-after-impact analysis
- Dynamic fatigue simulation
High impact resistance extends panel service life and reduces maintenance costs.
