Fracture Resistance of Composite Structurs From Hemp Bio-Fibers

Abstract

Lightweight sandwich structures are used in the aircraft industry because of their high strength-to-weight and stiffness-to-weight ratios. Structural components are often subjected to edge loads in compression or tension. The sandwich structure under the edge compression load exhibits excellent compression capacity. On the contrary of loading under flatwise compression, the sandwich under edge compression undergoes drastic tearing and fracture. The current study is based on experimental work on sandwich-structures made of carbon fiber and natural fiber reinforced face sheets with different core materials. The natural fiber (hemp) is highlighted in the current study to improve the fracture resistance of skins. The hemp-skin demonstrates comparable compression properties to those of carbon fiber under edge compressive load. The skin from hemp has great fracture resistance while the carbon one experienced dramatic fracture, tearing, and delamination. This outcome of the current study, in addition to the lightweight, lowcost ease handling, simple manufacturing, and eco-friendship make the hemp a competitive industrial material in aerospace applications. More details about the manufacturing and the failure modes are discussed as well.

Failure analysis of biocomposite sandwich pipe under internal pressure – Application for high pressure gas transportation pipelines MEDGAZ

“…Natural fiber composite materials are such an appropriate material that they can replace synthetic composite for many practical applications where we need high strength and low density. Pineapple leaf fiber (PALF) [54][55][56], palm, hemp [57,58], alfa, jute [42,52,59], cotton, bamboo, flax [60], silk [46,48], kenaf [43,49,61], and many others have been used in recent studies and the development of natural fiber composite structures. Table 1 compares natural and glass fibers and demonstrates in plain terms whether one has advantages over the other in several situations.…”

Micromechanical Analysis of a Bio-Sandwich Application for Cylinder under Pressure

“…Several research studies focus on the replacement of synthetic skins by eco-composites based on natural fibers [8][9][10] in a sandwich structure, such as palm, kenaf, banana, ramie, jute, leaf spring, flax, hemp, pineapple, and Alfa [11][12][13][14][15][16][17][18]. This interest is justified because of their widespread availability, lightness, strength [19,20], biodegradability, sustainable and renewable nature [21,22], in addition to their high specific modulus and low cost [16,23], low wear of tooling, skin irritation, and environmentally-friendliness [24,25].…”