BVID Reference
A quick reference for barely visible impact damage — definition, threshold, detection methods and structural significance.
Key Facts
BVID definition: Indentation < 0.5-1.0 mm (at or below visual inspection threshold) Internal damage may be extensive: Delamination area >> indentation diameter Pine-tree pattern through thickness Matrix cracks from impacted surface Detection: Visual: POOR (may miss) Tap test: MODERATE (near-surface) Ultrasonic C-scan: EXCELLENT (maps delamination) Structural significance: CAI strength reduction: 30-60% Governing condition for damage tolerance Must carry design load with BVID present