The response of strain on the face of composite laminates impacted by a projectile was recorded by strain gages. According to the theory of wave propagation and continum damage mechanics, the damage and damage threshold in the glass fiber/epoxy composite laminates were measured by variance of wave speed. It was found that the damage propagation in glass fiber/epoxy composites was faster during tension than during compression.
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江大志,王兴业,沈为,等.波速测量层合复合材料冲击损伤实验. Impact Damage of Composite Laminates Measured by Variance of Wave Speed[J].国防科技大学学报,1997,19(1):24-27.