Physical Behavior of Dog Bone Shape Specimen of Carbon Fiber Reinforced Composites during Longitudinal Tensile Test
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Physical Behavior of Dog Bone Shape Specimen of Carbon Fiber Reinforced Composites during Longitudinal Tensile Test
Joginder Singh1, Lazoh Umpo2, Aatish Kumar3 and Karanveer Singh4
1, 2, 3, 4 Manav Rachna University, School of Engineering,
Department of Mechanical Engineering,
Faridabad-121010, Haryana, India
Abstract. Bonding characteristics, composition, and internal structure have a strong effect on the behavior of materials under mechanical loading. The paper explores the mechanical characteristics of dog-bone shape Carbon Fiber Reinforced Composite (CFRC) specimens with longitudinal tensile test. The first tests were done on an isotropic material i.e. Mild Steel, Brass, Aluminum, Acrylic and Poly Lactic Acid (PLA) under typical tensile testing conditions. These samples deformed in a homogeneous manner and broke in the gauge length without any supplement, and this was in line with the direction-independent mechanical properties of isotropic materials. Unlike this, CFRC specimens exhibited uncharacteristic failure, that is, they fractured at the gripping areas instead of the gauge section when put to the same test. This was due to the anisotropic nature of CFRC, which provided variations in mechanical properties with fiber orientation and loading direction, which were determined by detailed analysis as the cause of this anomaly. The low transverse constraint in gripping resulted in concentration of the stress and early failures in the holding portions. In order to integrate this problem, tensile testing fixture was adjusted to apply the right transverse clamping force, whereby the specimen remains stable with an even distribution of load. Further tests on the modified design brought about consistent failure in the gauge length and repeatability in tensile response. This research displays the need to deal adjustment in testing the approach to anisotropic composite materials and the practicality of testing on the correct mechanical identification of CFRC samples.
Keywords: Carbon Fiber Composites, Tensile Test, UTM, Transverse Force, Water Jet Machine