Delamination

The separation or splitting of layers in composite materials, laminated structures, or coatings. Delaminations reduce load-bearing capacity and structural integrity, particularly in composites and adhesively-bonded structures. Ultrasonic C-scans are excellent for detecting and mapping delaminations due to the strong reflection from the separated layers. Delaminations in critical aerospace composites must be detected early as they can propagate rapidly under cyclic loading.

Detection and Assessment

Delamination must be detected early and accurately characterized to determine safety implications. Multiple NDT methods may be required for comprehensive evaluation.

Acceptance Criteria

Industry standards such as ASME Section V, AWS D1.1, and API standards provide specific acceptance limits. Whether a detected delamination is acceptable depends on material, component function, and applicable code.

Best Practices

• Always follow applicable NDT standards and procedures
• Use properly calibrated and maintained equipment
• Ensure personnel are properly trained and certified
• Document inspection procedures and results completely
• Keep current with industry standards and best practices