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Biocomposites

Biocomposites. Rene Herrmann. Textile characteristics. Any textile other then unidirectional is unisotropic , this means that the textile strength is dependent on direction The strength of a textile is the product of E- modulus and strain limit.

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Biocomposites

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  1. Biocomposites Rene Herrmann

  2. Textilecharacteristics • Any textileotherthenunidirectional is unisotropic, thismeansthat the textilestrength is dependent on direction • The strengthof a textile is the productof E-modulus and strain limit. • The E modulus is dependent on direction, the fibers absorb (reinforce) laminates in theirdirection. Forcesprependicularto the fibers are NOT reinforced by the fibers. • The strainingof a textile is NOT linear. At the beginning the textile (weave) is madeup from yarnsthatare not straigth and these fibers must first be ’straightend beforetheyabsorb force (reinforce)

  3. E modulusofbiaxialstich • If the biaxialtextile is made from 50% of fibers in angle -45 and 50% in +45 degrees, E modulus in 0 degrees is: • ANALYSE NOW othertextiles an PLOT their E moulus as functionofangle!

  4. E modulusdirectional(reference: modern yacht design)

  5. Textile CRIMP (reference: modern yacht design) • A textileweavestretchesbefore it absorbs force.

  6. CRIMP analysis • Calculate an approximatevalueof CRIMP for PLAIN and SATIN 8 and comparetheirvalues. • Consider a material (laminate) madewiththesetextiles and assumethat the resinstrain limit is 10%. Howmany procent of the fibers strengtharethenaccutallyused as reinforcement?

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