Experimental and numerical investigation of clinched joint and implementation of the results to design of a tumble dryer
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(2020) 42:567
TECHNICAL PAPER
Experimental and numerical investigation of clinched joint and implementation of the results to design of a tumble dryer Meral Bayraktar1 · Volkan Cerkez2 Received: 11 February 2020 / Accepted: 15 September 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract The present paper deals with the numerical modeling and experimental testing of the clinched joint formed by DX51D + AZ150 and AISI 430 material pairs. The strength of the joint was determined experimentally by the tension and shear tests. The numerical model developed for the analysis was successfully validated with the experimental data. The strength of the joint formed by alternative material pairs such as H340LAD + AZ150 and DX52D + Z275 is investigated numerically. The clinched joints between the tumble endplates and flange bodies were done according to the main findings from the previous steps. The study focuses on the strength of the clinched joint as an alternative to flange connection in the case of using different tumble endplate materials. It is concluded that the clinched joint formed by AISI 430 tumble endplate has the highest strength. In the need for tumble capacity increase without changing the design, it is recommended to use AISI 430 material for tumble endplate and to consider strength values of AISI 430 material for capacity control. On the other hand, in case of using three different tumble endplates for the same die, punch and process conditions, the tumble capacity should be evaluated by considering DX52D + Z275 material which has the lowest strength. Keywords Clinching process · Finite element method (FEM) · Joint strength · Shear strength · Tensile strength List of symbols a The distance between tumble and pulley (millimeter) D1 Pulley diameter (millimeter) D2 Tumble diameter (millimeter) f Belt frequency (Hertz) Fay Back side support force (Newton) Fç Peripheral force (Newton) Fkger Belt tight arm force (Newton) Fkgev Belt slack arm force (Newton) Flw Weight of laundry considered for the fast life test (Newton) Foy1 Left front support force (Newton) Foy2 Right front support force (Newton) Ft Belt tightness force (Newton) Ftw Weight of the tumble group (Newton) Technical Editor: Paulo de Tarso Rocha de Mendonça, Ph.D. * Meral Bayraktar [email protected] 1
Department of Mechanical Engineering, Yildiz Technical University, 34349 Besiktas, Istanbul, Turkey
Arçelik A.S., Cerkezkoy, Tekirdag, Turkey
2
k Belt centrifugal effect coefficient l Belt arm length (meter) L Belt length (meter) mrib Unit belt weight (kg/m/rib) n Pulley velocity (revolution per minute) nrib Number of layers in belt P Power transmitted (Watt) R1 Pulley effective radius (millimeter) R2 Tumble effective radius (millimeter) v Belt peripheral velocity (meter/second) 𝛽 Contact angle (°) μ Belt friction coefficient
1 Introduction Mechanical clinching is a fast process that provides the joining of two or more metal sheets without using additional material. Clinching is an
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