چكيده به لاتين
Adhesively bonded joints have important applications in current industries. Nevertheless, the variety of loading and boundary conditions in some cases, prevents the current adhesives not to meet the requirements of joints. Hence, researchers are trying to improve the mechanical properties of adhesives by adding some materials to them. Recently, the importance of environmental issues has made scholars to focus on the implementation of bio-degradable resources in different applications. The same trend is being followed in the adhesives improvement by adding different materials. In this study, the possibility of implementation of natural resources obtained from annual pruning of date palm tree in a new application is investigated. The effect of implementing fibers obtained from different parts of this tree in the structural adhesives to increase their tensile strength is studied. This was conducted in an empirical way using a considerable amount of experimental work. In this journey, first the tensile strength of fibers extracted from different parts of tree, in raw and treated with NaOH conditions is compared. Then, the effect of some parameters such as type, length, and weight ratio of fibers on the magnitude of tensile strength improvement in different adhesives is investigated. The results obtained from neat adhesive and composite samples demonstrate the success of implementation of aforementioned fiber in this application. In some cases, increase in strength even exceeds 64%. It is shown that the amount of increase resulted from fibers of various parts of tree is different. Moreover, a higher fiber length results in higher strength. It is also demonstrated the strengthening effect diminishes as fiber weight ratio surpasses a certain value.
Keywords: Natural fiber, Date palm tree, Tensile strength, Fiber treatment, Structural adhesives.
