S. Mohammad Reza Khalili - Center of Excellence for Research in Advanced Materials and Structures, Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
R. Eslami-Farsani - Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran
Ali Asghar Jaferzadeh Khoramabadian - Mechanical Engineering Faculty, Islamic Azad University South Tehran Branch, Tehran, Iran.
Sajad Hayati - Mechanical Engineering Department, Energy Faculty, Kermanshah University of Technology, Kermanshah, Iran

Using natural hemp fibers to reinforce the tensile characteristics of polymer matrix composites is investigated in this article. The fibers were applied to the epoxy matrix in unidirectional and hybrid tissue forms. After preparation of standard tensile stress test specimens via manual layup, the standard tensile test was done.  Young’s modulus, ultimate tensile stress, and the amount of absorbed energy before fracture were obtained experimentally. A comparison is performed with respect to fibers posture. In all cases, the tissue fiber samples gave a higher strength in comparison with the unidirectional laminated fibers. An analytical model is finally presented to estimate the elasticity modulus of the tissue reinforced composites.

Natural hemp fibers, Polymer-matrix composites, Strength, Mechanical testing