KSME International Journal

, Volume 12, Issue 1, pp 50–57 | Cite as

A study on residual fatigue bending strength and damage behavior of CFRP composites subjected to impact loadings

  • Kwang-Hee Im
  • Jeong-Ho Kim
  • In-Young Yang


This paper evaluates the static and fatigue bending strengths of CFRP (carbon-fiber reinforced plastic) laminates having impact damages, e.g., foreign object damages (FOD). Composite laminates used in this experiment are CF/EPOXY and CF/PEEK orthotropy laminated plates with two-interfaces [0°4/90°4]s A steel ball launched by an air gun collides against the CFRP laminates to generate impact damages. The damage growth during a bending fatigue test is observed by a scanning acoustic microscope (SAM). When the impacted side is compressed, the residual fatigue bending strength of CF/PEEK specimen P is greater than that of CF/EPOXY specimen B. On the other hand, when the impacted side is in tension, the residual fatigue bending strength of CF/PEEK specimen P is smaller than that of CF/EPOXY specimen B. In the case of impacted-side compression, the fracture is propagated from the transverse crack generated near the impact point. In the case of impacted-side tension, however, the fracture develops toward the impact point from the edge of interface-B delamination.

Key Words

Foreign Object Damages Impact Damage CFRP Delamination Area Impact Energy Residual Bending Fatigue Strength 


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Copyright information

© The Korean Society of Mechanical Engineers (KSME) 1998

Authors and Affiliations

  • Kwang-Hee Im
    • 1
  • Jeong-Ho Kim
    • 1
  • In-Young Yang
    • 2
  1. 1.Department of Mechanical EngineeringChosun UniversityKwangjuKorea
  2. 2.Factory Automation Research Center for Parts of Vehicles Department of Mechanical Design EngineeringChosun UniversityKwangjuKorea

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