A comparative evaluation of quasi- isotropic laminates ......Fabrics were then prepregged to 38%wt...
Transcript of A comparative evaluation of quasi- isotropic laminates ......Fabrics were then prepregged to 38%wt...
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A comparative evaluation of quasi-isotropic laminates composed of either braided triaxial fabric or woven fabric
Mike Braley, A&P Technology Brandon Strohminger, A&P Technology Barry Meyers, TenCate Advanced Composites
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Objective
• Compare braided reinforcement to woven reinforcement – 3k (“light”) and 12k (“heavy”) architecture.
• Mechanical testing – In-plane mechanical property characterization.
• Impact testing – 1 lb gelatin bird strike.
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Quasi-isotropic triaxially braided fabric
• QISO™ triaxial braided fabric – Fiber angles of 0°/±60°. – Quasi-isotropic and balanced in a single ply.
• Simple layup
– All plies oriented at 0°.
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Dry Fabric Characteristics
Fabrics were then prepregged to 38%wt RC with TenCate’s TC-275-1 epoxy resin.
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Laminate Characteristics and Layup
Note: Matched laminate FAW for braided and woven laminates.
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Laminate Cure
• Laminate cure – Autoclave cure by TenCate Advanced Composites – 135°C (275°F) cure cycle.
• Quality Check – UT C-scans – Weight and thickness measurements. Results below.
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Coupon Test Matrix
• All mechanical testing was completed by a third party testing house, Cincinnati Test Laboratories.
• *Denotes an industry accepted modification to the ASTM 3039 test method.
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Light Fabric Mechanical Results
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Heavy Fabric Mechanical Results
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Impact Testing
• (5) QISO and (5) woven laminates impact tested by the University of Dayton Research Institute. – Laminates were 25”x25” – Heavy or 12k architecture
• Impact projectiles were cylindrical gelatin birds
– 2.75” diameter and 5” long – 1 lb weight
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Impact Results
13% Δ
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QISO- front of panel (7929 J)
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QISO- back of panel (7929 J)
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Woven- back of panel (7205 J)
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Why? • Less undulation, straighter yarns provide
better translation of fiber properties. • Uniformity - same architecture layer to
layer reduces interlaminar shear stresses. • Interlocked multiaxial architecture
– enables superior load distribution around stress concentrations (OHT, OHC).
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Axial Yarns
QISO-H Weave Heavy
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Bias Yarns
QISO-H Weave Heavy
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Future Work • Additional coupon tests of QISO vs Woven
– Evaluate 2x2 woven twill construction – Progressive damage test and analysis with DIC and high speed video – Laminate with mid-plane layer mis-aligned at 100
– 300 off-axis tensile and compression – Instrumented Dyna-Tup to define BVID threshold
• Additional impact tests – Woven vs QISO at increased Vf – QISO vs Aluminum with composite projectiles
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Thank you,
Questions?
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Acid Digestion Results
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Light Fabric Results
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Heavy Fabric Results