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http://dx.doi.org/10.14346/JKOSOS.2020.35.5.1

A Fatigue Failure Analysis of Fractured Fixing Bolts of a Mobile Elevating Work Platform using Finite Element Methods  

Choi, Dong Hoon (Korea Occupational Safety and Health Agency)
Kim, Jae Hoon (Department of Mechanical Engineering, Chungnam National University)
Publication Information
Journal of the Korean Society of Safety / v.35, no.5, 2020 , pp. 1-8 More about this Journal
Abstract
Mobile elevating work platforms (MEWPs) consist of a work platform, extending structure, and chassis, and are used to move persons to working positions. MEWPs are useful but are composed of pieces of equipment, and accidents do occur owing to equipment defects. Among these defects, accidents caused by the fracture of bolts fixed to the extension structure and swing system are increasing. This paper presents a failure analysis of the fixing bolts of MEWP. Standard procedure for failure analysis was employed in this investigation. Visual inspection, chemical analysis, tensile strength measurement, microstructural characterization, fractography analysis by Optical Microscope(OM) and Scanning Electron Microscopy(SEM), and finite element analysis (FEA) were used to analyze the failure of the fixing bolts. Using this failure analysis approach, we found the root cause of failure and proposed a means for solving this type of failure in the future. First, the chemical composition of the fixing bolt is obtained by a spectroscopy chemical analysis method, which determined that the chemical composition matched the required standard. The tensile test showed that the tensile and yield strengths were within the required capacity. The stress analysis was carried out at five different boom angles, and it was determined that the fixing bolt of MEWP can withstand the loads at all the boom angles. The outcomes of the fatigue analysis revealed that the fixing bolt fails before reaching the design requirements. The results of the fatigue analysis showed primarily that the failure of the fixing bolt was due to fatigue. A visual inspection of the fractured section of the fixing bolt also confirmed the fatigue failure. We propose a method to prevent failure of the fixing bolt of the MEWP from four different standpoints: the manufacturer, safety certification authority, safety inspection agency, and owner.
Keywords
fatigue analysis; finite element analysis (FEA); mobile elevating work platforms (MEWPs); turntable fixing bolt;
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Times Cited By KSCI : 5  (Citation Analysis)
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1 D. H. Choi and J. H. Kim, "A Fatigue Analysis Study on the Fractured Fixing Bolts of Mobile Elevated Work Platforms", J. Korean Soc. Saf., Vol. 34, No. 5, pp. 1-6, 2019.
2 Woonchul Shin, "Proposed Revision of Standard on Articles for Aerial Work Platform", J. Korean Soc. Saf., Vol. 28, No. 7, pp. 9-13, 2013.
3 Strategic Forum for Construction, "Best Practice Guidance for MEWPs Avoiding Trapping/Crushing Injuries to People in the Platform", pp. 1-33, 2010.
4 Alex Hudgings and Brad James, "Fatigue Behavior of Bolted Connections", ASM International, 2002.
5 Sh. Molaei et al., "A Failure Analysis Study on the Fractured Connecting Bolts of a Filter Press", Engineering Failure Analysis, Vol. 4, pp. 26-38, 2015.   DOI
6 L. Li and R. Wang, "Failure Analysis on Fracture of Worm Gear Connecting Bolts", Engineering Failure Analysis, Vol. 36, pp. 439-446, 2014.   DOI
7 S. D. Dalvi et al., "Failure Analysis of a Carbon Steel Roller Shaft of Continuous Pad Steam Machine", Engineering Failure analysis, Vol. 9, pp. 118-128, 2017.   DOI
8 O. Asi, "Failure of a Stud Bolt in a Ring Spinning Frame Textile Machine", Engineering Failure Analysis, Vol. 13, pp. 963-970, 2006.   DOI
9 Z. Yu et al., "Failure Analysis on Connection Components of Turbo-disk and Maim-shaft used in a Locomotive Turbocharger", Engineering Failure Analysis, Vol. 16, pp. 899-908, 2009.   DOI
10 Z. Yu et al., "Failure Analysis of Connecting Bolts and Location Pins Assembled on the Plate of Main-shaft used in a Locomotive Turbocharger", Engineering Failure Analysis, Vol. 15, pp. 471-479, 2008.   DOI
11 M. T. Milan et al., "Failure analysis of a SAE 4340 Steel Locking Bolt", Engineering Failure Analysis, Vol. 11, pp. 915-924, 2004.   DOI
12 ISO 898-1, "Mechanical Properties of Fastener Made of Carbon Steel and Alloy Steel-Prat 1: Bolts, Screws and Studs with Specified Property Classes - Coarse Thread and Fine Pitch Thread", 2009.
13 Korea Industrial Safety Association, "Documents of MEWP Safety Certification", 2013.
14 B. Qiu et al., "Experimental Study on Fatigue Performance of M30 High-strength Bolts in Bolted Spherical Joints of Grid Structures", Engineering Structures, pp. 110-123, 2020.
15 Online Materials Information Resource - MatWeb. http://www.matweb.com/
16 ASTM E415, "Standard Test Method for Analysis of Carbon and Low-alloy Steel by Spark Atomic Emission Spectrometry", 2017.
17 ASTM A370, "Standard Test Method and Definitions for Mechanical Testing of Steel Products", 2017.
18 D. P. Hong et al., "Stress analysis for 46 kV Insulated Boom Design of 20 M-class High Place Operation Car", Proceedings of the Korean Society for Noise and Vibration Engineering, pp. 528-529, 2012.
19 T. Matsueda. "An Alternative Method to Evaluate Endurance Limit in Plain Steel Specimens (JIS, S15C S45C and A286)", Applied Mechanics and Materials, Vol. 563, pp. 85-89, 2014.   DOI
20 J. K. Kwon, "Structural Analysis of Bolt", CAD&Graphic, Vol. 12, pp. 144-147, 2010.
21 J. H. Lee and J. M. Hong, "Structure Analysis of Boom Joint for 2.5 Ton Class Aerial Lift Truck", The Korean Society for Precision Engineering Spring Conference, Vol. 5, pp. 586-587, 2017.
22 J. M. Hong and J. H. Lee, "Optimal Design of Boom Joint for 2.5 Ton Class Aerial Lift Truck", J. Korean Soc. Precis. Eng., Vol. 35, pp. 769-775, 2018.   DOI
23 G. H. Majzoobi et al., "Experimental Evaluation of the Effect of Thread Pitch on Fatigue Life of Bolts", International Journal of Fatigue, Vol. 27, pp. 189-196, 2005.   DOI
24 Xin Chen et al., "Fatigue Failure Analysis for Bot-nut Connections Having Slight Pitch Differences using Experimental and Finite Element Methods", Acta Polytechnica Hungarica, Vol. 12, pp. 61-79, 2018.
25 S. Hanaki et al., "On Stochastic Evaluation of S-N Data based on Fatigue Strength Distribution", International Journal of Fatigue, Vol. 32, pp. 605-609, 2010.   DOI
26 K.-S. Nam et al., "Structure and Fatigue Analysis of Pull-in Winch Frame using the FEA", The Korean Society of Mechanical Engineers Spring Conference, Vol. 5, pp. 363-365, 2014.
27 J. H. Ko and D. M. Kang, "CAE Analysis on Strength and Fatigue of Rear Door of Passenger Car", Journal of the Korean Society of Manufacturing Process Engineers, Vol. 13, pp. 63-69, 2014.   DOI
28 Y. -J. Shin et al., "Fatigue CAE Analysis of a Rebar Bending Machine Roller", Journal of the Korean Society of Manufacturing Process Engineers, Vol. 14, pp. 75-80, 2015.
29 D. Ozmen et al., "Static, Dynamic and Fatigue Analysis of a Semi-automatic Gun Locking Block", Engineering Failure Analysis, Vol. 16, pp. 2235-2244, 2014.   DOI
30 ISO 8686-2, "Crane-design Principles for Loads and Load Combinations-Part 2: Mobile Cranes", 2004.
31 H. O. Fuchs and R. I. Stephens, "Metal Fatigue in Engineering", John Wiley and Sons, New York, 1980.