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Related Concept Videos

Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

116
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
116
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  11. Nondestructive Inspection And Quantification Of Select Interface Defects In Honeycomb Sandwich Panels

Nondestructive Inspection and Quantification of Select Interface Defects in Honeycomb Sandwich Panels

Mahsa Khademi1, Daniel P Pulipati1, David A Jack1

  • 1Department of Mechanical Engineering, Baylor University, Waco, TX 76798, USA.

Materials (Basel, Switzerland)
|June 19, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

This study introduces a high-frequency ultrasound testing (UT) method to detect and quantify defects in carbon fiber honeycomb sandwich panels. The novel approach accurately identifies various defects, even those below current detection limits, improving structural integrity assessments.

Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Composite Materials

Background:

  • Honeycomb sandwich panels offer high strength-to-weight ratios for industrial use.
  • Defects at the core-facesheet interface impair load transfer and panel efficiency.
  • Existing non-destructive testing methods primarily focus on defect detection, not quantification.

Purpose of the Study:

  • To develop and validate a high-frequency ultrasound testing (UT) method for detecting and quantifying defects in carbon fiber honeycomb sandwich panels.
  • To assess the performance of UT using both laboratory immersion and portable single-side access systems.
  • To evaluate the method's capability in identifying various defect types and sizes, including those below current detection limits.

Main Methods:

  • Utilized high-frequency ultrasound testing (UT) with single-side access.
Keywords:
carbon fiber compositedefect identificationdefect quantificationhoneycomb core composite

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  • Employed two testing approaches: a laboratory immersion tank and a novel portable UT system.
  • Tested coupons with manufactured defects (missing adhesive, foreign objects, damaged/removed core) ranging from 5 to 40 mm.
  • Developed an algorithm to quantify defect geometry and perimeter.

    • Main Results:

    • Successfully detected and quantified defects with an average diameter error of 0.6 mm (immersion) and 1.1 mm (portable).
    • Achieved high accuracy for missing adhesive defects (0.3 mm error).
    • Quantified missing or damaged honeycomb defects with an average error of 0.7 mm, significantly below the 15-25 mm detection limit of existing methods.

    Conclusions:

    • High-frequency UT is effective for detecting and quantifying defects in carbon fiber honeycomb panels.
    • The developed method surpasses current inspection capabilities for small and complex defects.
    • This technique enhances the assessment of structural integrity and manufacturing quality for composite sandwich panels.
    nondestructive testing