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Thongchart Kerdphol
Kyushu Institute of Technology
Industrial & Manufacturing Engineering

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Experimental Manufacturing Methods of Glass Fiber Composites Considering Flexural Behaviour Wipada Boransan; Thongchart Kerdphol; Veena Phunpeng
Spektrum Industri Vol. 19 No. 2: October 2021
Publisher : Universitas Ahmad Dahlan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/si.v19i2.21658

Abstract

Fiber-reinforced plastic laminates (FRPL) and sandwich composites are outstanding materials due to its mechanical properties (i.e., light weight, low density and high strength to weight ratio). These applications are widely used in the fields of aviation, automotive and construction industries. The superior mechanical properties depend on the properties of reinforcing materials, matrixes and manufacturing processes. This research proposes the comprehensive study of mechanical properties of epoxy resin reinforced by glass fibers under different processes. Glass-fiber sandwich composites were manufactured by the hand lay-up process and cured in different methods (i.e., with and without vacuum bagging). The comparison between curing temperature and pressure is investigated using the vacuum bagging process to determine the mechanical properties under flexural tests. Experimental tests are performed using the universal testing machine (UTM). As a result, it is confirmed that the hand lay-up process affects the flexural stress, deflection and internal force of both fiber-reinforced plastic laminates and sandwich composites. At the high curing temperature, the vacuum bagging method significantly provides the greater flexural stress, deflection and load
Laboratory Study of Polypropylene-based Honeycomb Core for Sandwich Composites Karunamit Saensuriwong; Thongchart Kerdphol; Veena Phunpeng
Spektrum Industri Vol. 19 No. 2: October 2021
Publisher : Universitas Ahmad Dahlan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/si.v19i2.21659

Abstract

Nowadays, a structure of sandwich composites can be reinforced by with hybrid materials such as polypropylene core. Due to its high strength properties, the polypropylene is widely used in various fields of science, technology and engineering including aerospace applications. This research studies the well-known hybrid composites of a carbon fiber (CF) and glass fiber (GF) to evaluate the mechanical properties under the presence of sandwich composites reinforced with such fibers. The different curing-pressure values of each material workpiece have been investigated to determine the curing pressure, resulting in the superior performances and properties. The specimens are moulded by the hand lay-up (i.e., cloth laying angle) of the carbon fiber. By changing direction, the specimens are determined the greatest load-bearing direction based on the bending test. According to the ASTM standard on the strength determination, it is found that when the curing pressure increases, the flexural stress increases. By placing the material orientation in the order (i.e., [CF90 / CF0 / GF0 / Core / GF0 / CF0 / GF0]) provides the highest strength. When the strain reaches its maximum value, the specimens actually fracture. The fracture propagation is generally followed the fiber orientation of the fabric. The experimental results are observed that the lower curing pressure the thicker of the work piece and the fiber volume fraction decreases. The obtained results show that changes in the curing pressure and laying angle significantly affect the mechanical properties of the sandwich composites
Co-Authors Karunamit Saensuriwong Veena Phunpeng Wipada Boransan