We are using Jute fiber in a bio-composite laminate. What are the different theories available to get lamina and laminate analysis? How can we get the elastic and strength properties? We have a database for carbon/epoxy, glass/epoxy.
The lamina is a layer, stress & strain assumed constant but laminate make several lamina and depend on the theory that we use the stress & strain can vary through laminate
Rule of Mixtures + Laminate Theory may be used, however the approximations will not be as good as in the case of carbon or glass fiber reinforcements. This is due to the WIDE variations in physical and mechanical properties of plant based fibers like jute (due to growing/harvesting conditions, processing, etc). The poor fiber/matrix interface common in these composites will also hurt the accuracy of your theoretic approximations. Some researchers have introduced adjustment factors to the rule of mixtures to account for interfacial strength and fiber diameter variations, however those factors would be unique to your specific fiber and matrix combination and perhaps even your batch of fibers
Natural fibres has no data base for now like the synthetic counter parts. Conduct a single fibre tensile test (SFTT) to determine the strength and the modulus of the jute fibre. then use the material property so obtained to calculate the theoretical equivalents using rule of mixture, Halpi Tsai etc for the lamina and Laminate theory for the laminates. note natural fibres has a lot of variation due to age, location and part and type of plant fibre.
Rule of mixtures,
Laminate theory
Finite elment analysis (ANSYS, COMSOL etc)
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