Experimental Investigation on Performance of Helical Spring Lock Washer Under Different Operating Conditions
- PDF / 831,124 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 72 Downloads / 203 Views
TECHNICAL ARTICLE—PEER-REVIEWED
Experimental Investigation on Performance of Helical Spring Lock Washer Under Different Operating Conditions Hemant Krishnarao Wagh . Girish R. Desale
Submitted: 18 March 2018 / Accepted: 14 July 2019 Ó ASM International 2019
Abstract In mechanical systems, emphasis has been given to the selection and health monitoring of both bolt and nut in the bolted joint assembly; less attention has been given to the performance of spring washers due to tightening torque, usage duration and reuse. In the present experimental investigation, the load–deflection characteristics of helical spring lock (HSL) washer during compressive loading and unloading are determined using newly designed and developed test rig. Also, the load– deflection characteristics of the HSL washers are examined for reuse cycles. Additionally, the effect of compressive loading and unloading on the reaction load within elastic limit is determined. Further, the loss of helix height due to compressive loading and its effect on strain energy is examined. The tests have evidenced of loss of helix height and strain energy of HSL washer due to compressive loading which deteriorates its functionality in further usage. Keywords Helical spring lock (HSL) washer Load–deflection characteristics Reuse Torque Tightening usage time Bolted joint
H. K. Wagh (&) G. R. Desale CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra 411 008, India e-mail: [email protected] H. K. Wagh Department of Mechanical Engineering, R. C. Patel Institute of Technology, Shirpur 425 405, India H. K. Wagh Kavayitri Bahinabai Chaudhari, North Maharashtra University, Jalgaon 425 001, India
Introduction The nut, bolt and washers are the crucial components of bolted joint assembly having wide range of commercial and industrial applications from aerospace to agriculture engineering. Many researchers have carried out the investigation on different aspects of bolt and nut, namely, its design, tightening torque, wear, fatigue, loosening, reuse, etc. [1–6]. Also, different standard guidelines are available for nut and bolt selection and its further usage [7, 8]. Particularly, the reuse guidelines of yielded bolt have been given by Fernando et al. [9]. They have recommended that if bolt is yielded it shall not be reused, because this will alter the geometry and the mechanical properties of the bolt. Zimandy et al. [10] conducted the various experiments to study the effect of the reuse of locknuts with a prevailing torque locking feature in terms of unseated and seated reuses. They reported that the unseated reuse tests show a moderate decrease in prevailing torque while during first reuse it was observed maximum. The effect of reuse seating to preload was observed with higher loss in prevailing torque compared with the unseated results. The commercial and business aspects of emerging technology of 3D e-sourcing were studied by Rea et al. [11], the stateof-the-art part sourcing was outlined and estimates of the potential benefits of
Data Loading...
