Failure strains Test value ISO [1] * E-glass Carbon Aramid


1.31% 1.04% 1.49%


1.44% 0.99% 1.34%


* uses the default value from UTS/E [1] Table 5: Tensile failure strains – test values v ISO default values


FLEXURAL TESTS Layup


Nominal fibre volume fraction = 34%


A 8 x 295 E-glass B 8 x 280 Carbon C 8 x 290 Aramid 2 x 295 E-glass


D 4 x 280 Carbon 2 x 295 E-glass 2 x 280 Carbon


E 4 x 295 E-glass 2 x 280 Carbon Alternate plies


F of 280 carbon and 295 E glass


2 x 295 E-glass


G 4 x 290 Aramid 2 x 295 E-glass 2 x 290 Aramid


H 4 x 295 E-glass 2 x 290 Aramid Alternate plies


I of 290 aramid and 295 E glass


2 x 280 carbon


J 4 x 290 Aramid 2 x 280 carbon 2 x 290 Aramid


K 4 x 280 carbon 2 x 290 Aramid Alternate plies


L of 290 aramid and 280 carbon


Mfail = MFPF for all except panels I and L Schematic EI (N.mm)


20 coupons of each % difference 2.81


2.79 0.6%


4.01 3.66 8.8%


5.21 4.75


3.22 0.6%


3.68 3.22


12.3% 3.40


3.22 5.3%


4.01 3.77 6.1%


4.26 3.77


13.1% 4.01


3.77 6.0%


4.60 4.20 8.6%


4.87 4.20


13.7% 4.67


4.20 10.0%


Table 1 strains ISO-12215-5 (H) Mfail (N)


Mfail (N)


Test value t** Test value** Test value** Test value** Calculated t Calculated + Calculated + Calculated + % difference % difference % difference


29159 27080 7.1%


179650 146290 18.6%


150414 182104


56129 52452 6.6%


477 311


34.9% 908


960


-5.7% 688


690


8.7% -21.1% -0.3% 3.24


548 521


122276 95402 22.0%


90334 74137 17.9%


77871 72928 6.3%


78237 89753 -14.7%


73398 81816 -11.5%


244860 204923 3.0%


123136 134067 -8.9%


163348 167720 -2.7%


deviation 1.9%


5.1% 738


710


3.7% 672


580


13.8% 722


619


14.2% 698


428 463


27.8% 936


1170


-24.9% 852


574


32.6% 884


795 10.1%


deviation 14.5%


477 196


58.9% 908


487


46.3% 688


369


46.3% 548


328


40.2% 738


361


51.0% 672


295


56.2% 722


296


59.0% 698


230


62.9% 204.0% 642


642 213


66.8% 936


594


36.5% 852


307


64.0% 884


364 58.8%


Average 't' Average 'EI' Average 'Mmin' Average 'Mmin' deviation 7.8%


deviation 65.7%


Table 6: Flexural test results – test values v calculated using Annex C [1] modulus and failure strains from Table 1


B-40


© 2008: Royal Institution of Naval Architects


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