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 Due to anisotropic properties of honeycombs, MIL handbook 17B does not recommend ASTM C393, or 3 point bend test as a valid indicator of honeycomb cored panel behavior. It is viewed as a possible quality control test but not indicative of the real attributes of the structure. It is generally felt that a better indicator would be the ASTM D 6146-99) (Standard Test Method for Two-dimensional Flexural Properties of Simply Supported Sandwich Composite Plates Subjected to a Distributed Load) or also known as "The Hydramat test". These tests have produced results that validate the accompanying Strength of Materials Data. The viscoelastic behavior of Nida-Core Polypropylene Honeycomb will typically permit far greater deflections without structural failures so the Deflection at Load is supplied for comparison but this does not imply a Load to fail.
All tests carried out by independent laboratory. This information is provided in good faith and is subject to modifications without prior notification. It does not constitute a commitment, neither a contractual document. Nida-Core Corp will not assume any liability form use or misuse of data presented herein.
Assessment of suitability is the responsibility of end user only.
MATERIAL |
Total Thickness of sandwich inches |
Modulus (MSI) |
Max Ply Stress (PSI) |
% of each ply's ultimate strength |
Bending Stiffness Lb/sq.inch |
Total weight Lb/ft2 |
Flatwise compression Fmax/ Area (PSI) |
Nida-Core H8PP 10 mm + 18 oz WR both sides |
0.448 |
1.95 0 1.95 |
42000 0 42000 |
100 0 100 |
4972 |
0.662 |
188 |
Nida-Core H8PP 13 mm + 18 oz WR both sides |
0.568 |
2.25 0 2.0 |
26300 0 26142 |
100 0 88.27 |
8929 |
0.712 |
188 |
Nida-Core H8PP 20 mm + 18 oz WR both sides |
0.808 |
2.25 0 2.0 |
26300 0 26189 |
100 0 88.18 |
18642 |
0.812 |
188 |
Nida-Core H8PP 25 mm + 18 oz WR both sides |
1.058 |
2.25 2.3 2 |
26300 20727 26215 |
100 0 88.27 |
32521 |
0.917 |
188 |
Deflection values based on 200lb point load centrally with simple support for 18 oz WR panels with H8PP core.
DEFLECTION
VALUES |
SPAN |
SPAN |
SPAN |
Core thickness
MM |
24" |
36" |
48" |
10 |
0.12" |
0.27" |
0.48" |
13 |
0.067" |
0.15" |
0.27" |
20 |
0.032" |
0.072" |
0.13" |
25 |
0.018" |
0.04" |
0.073" |
38 |
0.008" |
0.018" |
0.033" |
50 |
0.005" |
0.011" |
0.019" |
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