Influence of Spring Index and Heat Treatment Temperature of Shape Memory Alloys on Offset Crank Heat Engine Efficiency

Authors

  • Bunheng Hok Energy Engineering, Faculty of Engineering and Technology, Siam Technology College
  • Vannet Yorn Energy Engineering, Faculty of Engineering and Technology, Siam Technology College
  • Aphinan Phukaoluan Department of Mechanical Technology Education, Faculty of Industrial Education and Technology, King Mongkut’s University of Technology Thonburi
  • Saravy Dum Energy Engineering, Faculty of Engineering and Technology, Siam Technology College

Keywords:

Shape Memory Spring, Spring Index, Offset Crank Heat Engine, Heat Treatment

Abstract

This research aims to study the effect of the shape memory spring index and heat treatment temperature on the heat engine efficiency using 0.5 mm shape memory wire to form springs with indices of (D/d) 7, 9 and 11. The springs were then subjected to a heat treatment at 350, 400 and 450oC for 30 min followed by quenching in cold water. These specimens were investigated for recovery force with a tensile test and phase transformation temperature with Differential Scanning Calorimeter (DSC). After getting the appropriate spring conditions, the springs were installed in the offset crank heat engine. The heat engine has an outer diameter of 522 mm, an inner diameter of 120 mm, an offset length of 50 mm, an offset angle of 30o, minimum and maximum spring length of 60 mm and 160 mm respectively. Springs were installed 9 rows throughout the circumference of the heat engine with 16 springs each row in the oblique line. The result illustrated that the spring with index of 7, heated at 400oC provides maximum recovery force equal to 3.254 N, transformation temperature to austenite finish phase at 62oC with the hysteresis of 15oC. When the springs were installed in the heat engine, at the water temperature of 75oC, it was found that the engine can generate maximum torque of 1.380 N.m, the mechanical power is 1.391 W, the maximum mechanical efficiency is 0.42%, the electrical power is 0.255 W and the maximum electrical efficiency is 18.32%

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Published

2021-08-10

Issue

Vol. 1 No. 1 (2021): January - June

Section

Research article

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