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การทดสอบภายใต้แรงดึงทางเดียวด้วยการติดตามภาพวิดีโอบนโทรศัพท์เคลื่อนที่ : กรณีศึกษาการผิดรูปของเส้นด้ายกัญชง |
|---|---|
| รหัสดีโอไอ | |
| Creator | วิไลพร ลักษมีวาณิชย์ |
| Title | การทดสอบภายใต้แรงดึงทางเดียวด้วยการติดตามภาพวิดีโอบนโทรศัพท์เคลื่อนที่ : กรณีศึกษาการผิดรูปของเส้นด้ายกัญชง |
| Contributor | นภารัตน์ จิวาลักษณ์ |
| Publisher | King Mongkut’s University of Technology Thonburi |
| Publication Year | 2565 |
| Journal Title | KMUTT Research and Development Journal |
| Journal Vol. | 45 |
| Journal No. | 2 |
| Page no. | 235-245 |
| Keyword | Uniaxial Tensile Test, Hemp Fiber, High Speed Video, Mobile Phone, Tracker Program |
| URL Website | https://journal.kmutt.ac.th/ |
| Website title | เว็บไซต์วารสารวิจัยและพัฒนา มจธ. |
| ISSN | 2697-5521 |
| 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. |
