Abstract
Composite is a material that consisting of two or more materials, either micro or macro, where the properties of the material differ in shape and chemical composition from the original substance. In this study, fatigue testing of fiber metal composites was carried out to determine the rate of crack propagation so that the age of the fiber metal composite specimen was known. The independent variable in this research is the angular orientation of the carbon fiber and the surface roughness of the aluminum with the dependent variable response is the bridge crack rate. The manufacture of fiber metal laminates specimens uses the Vacuum Resin Infuse (VARI) method, which uses a vacuum pump as a means to flow the resin from the reservoir to the mold. This method is used to minimize the occurrence of air bubbles trapped on the specimen which causes porosity defects which will reduce the strength of the metal laminates specimen itself. Fatigue testing is performed using the stress amplitude method. That is, the value of the load when the tensile test is one third of the tensile strength. After the fatigue test was carried out, the results were obtained on specimens with an angular orientation of 0/90 ° fibers, the crack propagation rate slowed down with a cycle value of 90000 in specimens with a surface roughness value of 2.128 µm then decreased cycles on specimens with a value of 2.887 µm, namely 11000 cycles.
Highlights
In developments in the field of technical materials, most metals are processed into household utensils, tableware and drinking utensils, ornaments and weapons of war such as swords, armor and shields at the beginning of the discovery of metal by mankind, which was around 6000 BC [1]
The fatigue test in this study was carried out to observe the crack propagation rate of metal laminates fiber specimens for each variation of surface roughness and angular orientation of the fibers. By carrying out this fatigue test, the number of cycles data of the metal laminates specimen for each surface roughness variation and fiber angular orientation variation is shown in the following table : Table 1
The results of fatigue testing of fiber metal laminates specimens with an angular orientation of 45 / 45o fibers are shown in the following table: Table 2
Summary
In developments in the field of technical materials, most metals are processed into household utensils, tableware and drinking utensils, ornaments and weapons of war such as swords, armor and shields at the beginning of the discovery of metal by mankind, which was around 6000 BC [1]. With the development of science and technology, metals are processed for industry. The automotive industry is one of the industrial fields that uses a lot of metal as raw material for its production. Such as in the manufacture of car frames, motorcycle frames, car bodies, auto and motorbike parts and components of motor vehicle engines. Besides being widely used in the automotive industry, metal is widely used as a building construction material. Military defense is an industry that uses metal as raw material for production, such as making tanks, cannons, rifles, and others
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