Uniaxial Tensile Test Using Mark-Tracking Video on a Smart Phone: Case Study on Hemp Yarn Deformation

Naparat Jiwalak; Vilaiporn Luksameevanish

Authors

Naparat Jiwalak Department of Chemistry, Faculty of Science and Technology, Chiang Mai Rajabhat University, Chiang Mai, Thailand
Vilaiporn Luksameevanish Department of Physics and General Science, Faculty of Science and Technology, Chiang Mai Rajabhat University, Chiang Mai, Thailand

Keywords:

Uniaxial Tensile Test, Hemp Fiber, High Speed Video, Mobile Phone, Tracker Program

Abstract

This research aimed to investigate deforming marks on hemp yarn samples undergoing uniaxial tensile tests by using a high-speed video recorder at 120 frames per minute on an iOS mobile phone. The hemp yarn samples were evenly threaded, having the diameter of 0.64 mm. Five conditions of initial grip length of fiber were investigated i.e., 2.5, 5.0, 10.0, 20.0 and 25.0 cm. The observations showed that the lower metal grip or the yarn held at the lower metal grip had no movement, while the upper grip or the yarn held at the upper metal grip moved upward at the speed equal to the speed of the cross head of 30 cm per min. Two marking points, which were 1.0 cm apart, at the middle of each tested specimen deformed consistency at about half the upper grip speed. Linear stress-strain relationships up to the breaking point of the fiber were noted. Young’s modulus and tensile strength of the specimens decreased when the initial yarn grip length was larger than 5.0 cm, at which point the maximum values of these properties were 36 MPa and 48 MPa, respectively. On the other hand, elongation at break of the specimens increased with an increase in the initial yarn grip length of longer than 5.0 cm. The minimum and maximum values of this property were 137% and 210%when the initial grip length were 5.0 and 25.0 cm, respectively.

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