Numerical and experimental study of spring return of a biodegradable composite

Subject Areas :

Received: 2023-09-25 Accepted : 2023-09-25 Published : 2023-08-23

Keywords: Bending, Composite, Spring Back, Natural Fibers,

Abstract :

Ahmad Soheili Mehdizadeh 1, Ali Adelkhan2 * 1-2- Department of Mechanical Engineering, Technical and Engineering Faculty, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran *Coresponding author: [e-mail] In the construction of composite materials, different polymer fibers are used, which do not decompose in the environment for hundreds of years, so for this purpose, in this research, natural and biodegradable kenaf fibers were used to make composites. Carbon fibers were prepared as strings. In order to make the composite, three different arrangement methods were considered for kenaf fibers, including transverse, longitudinal and two-way methods. Different composite samples were first made by using manual layer-laying method. Then tensile and bending tests were performed on each sample. The results showed that the best model for having the highest yield stress, ultimate bending limit and modulus of elasticity was the composite made with bidirectional kenaf fibers. Then the bending process of the composite sheet with two-way kenaf fibers was modeled in the Abaqus software. Bending conditions included punch corner radius, punch speed and die type. The analysis of numerical modeling results showed that as the bending speed increases and also the punch corner radius decreases, the maximum stress in the bent sheet increases. On the other hand, the analysis of the results of the spring back due to numerical modeling showed that the minimum spring back in V-shaped was found to be 0.9, which corresponded to a speed of 50 mm/s and a radius of 4 mm. In the same conditions, for the U-shaped die, the spring back was 1.23 degrees. Finally, the spring back process was experimentally performed for composite samples in two U-shaped and V-shaped molds, and the results showed that the average error rate of both numerical and laboratory methods was 15.16%.