Abstract
The aim of this paper is to evaluate the Mode II interfacial fracture toughness and interfacial shear strength of Typha spp. fiber/PLLA and Typha spp. fiber/epoxy composite by using a double shear stress method with 3 fibers model composite. The surface condition of the fiber and crack propagation at the interface between the fiber and the matrix are observed by scanning electron microscope (SEM). Alkali treatment on Typha spp. fiber can make the fiber surface coarser, thus increasing the value of interfacial fracture toughness and interfacial shear strength. Typha spp. fiber/epoxy has a higher interfacial fracture value than that of Typha spp. fiber/PLLA. Interfacial fracture toughness on Typha spp. fiber/PLLA and Typha spp. fiber/epoxy composite model specimens were influenced by the matrix length, fiber spacing, fiber diameter and bonding area. Furthermore, the interfacial fracture toughness and the interfacial fracture shear stress of the composite model increased with the increasing duration of the surface treatment.
Highlights
The use of natural fibers as reinforcement of polymers composite has been researched by many scientists and has grown rapidly [1,2,3]
Typha spp. fiber is one of the natural fibers that can be considered as a polymer reinforcement for composite [12]
The evaluation of the surface morphological of theThe untreated and the alkali-treated fibers was performed a by scanning electron microscope
Summary
The use of natural fibers as reinforcement of polymers composite has been researched by many scientists and has grown rapidly [1,2,3]. The green composite concept has attracted the interest of many researchers and engineers due to the superiority of these composites in terms of mechanical performance and excellency in energy efficient and environmental aspects such as bio-degradable, renewable and recyclable [5,6,7,8,9]. The all green composites promote the utilization of composites consisting polymers and reinforcement materials from renewable resources. Typha spp. fiber is one of the natural fibers that can be considered as a polymer reinforcement for composite [12]. The widespread of Typha dominates the area and raises concerns for the community as it is cannot be cultivated nor exploited well. This makes Typha spp. being known as a parasitic plant [12,13].
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