Impact Stress Analysis for the Welding Joint in a Rotary Dryer

Document Type : Research Article

Authors

Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran

Abstract

This paper discusses the failure phenomenon of the welding joint for the flight bars in a rotary dryer under impact loading. The flight bars are utilized to provide a curtain of particles and to avoid direct cohesion of the production to the steam tubes. In addition, some gravitational hammers knock off the shell's outer skin to fall off the product buildup on the shell's inner surface. The condition monitoring has revealed that periodic impacts of hammers on the outer skin will result in welding joint failure between the flight bars and the shell followed by a complete detachment. Assuming that the hammer impacts the shell by a constant rotational speed, finite element software is employed to simulate the mentioned problem. According to the results, severe stress concentration and plastic deformation arise around the roots of welding joints. To prevent joint failure, different mechanisms are proposed such as relocation of the welding joints, employment of the stiffening angles, and an increase in the thickness of the absorbing pad. The outcome of the current study showed that relocation of the welding joint toward the flight bar end and the application of a stiffening angle can decrease the maximum von Mises stress by a factor of 18% and 43%, respectively. Moreover, using a composite absorbing pad will decrease the von Mises stress around the welding joint root by about 80%.

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[1] B. Langrand, E. Markiewicz, Strain-rate dependence in spot welds: Non-linear behaviour and failure in pure and combined modes I/II, International Journal of Impact Engineering, 37(7) (2010) 792-805.
[2] A. Tyas, J.A. Warren, E.P. Stoddart, J.B. Davison, S.J. Tait, Y. Huang, A Methodology for Combined Rotation-Extension Testing of Simple Steel Beam to Column Joints at High Rates of Loading, Experimental Mechanics, 52(8) (2012) 1097-1109.
[3] H. Qu, J. Huo, C. Xu, F. Fu, Numerical studies on dynamic behavior of tubular T-joint subjected to impact loading, International Journal of Impact Engineering, 67 (2014) 12-26.
[4] H. Qu, Y. Hu, J. Huo, Y. Liu, Y. Jiang, Experimental study on tubular K-joints under impact loadings, Journal of Constructional Steel Research, 112 (2015) 22-29.
[5] J. Ribeiro, A. Santiago, C. Rigueiro, P. Barata, M. Veljkovic, Numerical assessment of T-stub component subjected to impact loading, Engineering Structures, 106 (2016) 450-460.
[6] P. Cui, Y. Liu, F. Chen, J. Huo, Dynamic behaviour of square tubular T-joints under impact loadings, Journal of Constructional Steel Research, 143 (2018) 208-222.
[7] T. Björk, A. Ahola, N. Tuominen, On the design of fillet welds made of ultra-high-strength steel, Welding in the World, 62(5) (2018) 985-995.
[8] F.-F. Sun, M.-M. Ran, G.-Q. Li, Y.-B. Wang, Mechanical behavior of transverse fillet welded joints of high strength steel using digital image correlation techniques, Journal of Constructional Steel Research, 162 (2019).
[9] T. Shiozaki, N. Yamaguchi, Y. Tamai, J. Hiramoto, K. Ogawa, Effect of weld toe geometry on fatigue life of lap fillet welded ultra-high strength steel joints, International Journal of Fatigue, 116 (2018) 409-420.
[10] T. Skriko, T. Björk, T. Nykänen, Effects of weaving technique on the fatigue strength of transverse loaded fillet welds made of ultra-high-strength steel, Welding in the World, 58(3) (2014) 377-387.
[11] E.L. Grimsmo, A.H. Clausen, M. Langseth, A. Aalberg, An experimental study of static and dynamic behaviour of bolted end-plate joints of steel, International Journal of Impact Engineering, 85 (2015) 132-145.
[12] J. Huo, J. Zhang, Y. Liu, F. Fu, Dynamic Behaviour and Catenary Action of Axially-restrained Steel Beam Under Impact Loading, Structures, 11 (2017) 84-96.
[13] K. Chen, Y. Zhang, K.H. Tan, Behaviour of steel beam-column joints subjected to quasi-static and impact loads, Journal of Constructional Steel Research, 183 (2021).
[14] E.O. Ogundimu, E.T. Akinlabi, M.F. Erinosho, Study on Microstructure and Mechanical Properties of 304 Stainless Steel Joints by Tig–Mig Hybrid Welding, Surface Review and Letters, 25(01) (2018).
[15] K.K. M. Shariati, B. Jahangiri, A. Saber, Experimental study on ratcheting and softening behavior of stainless steel 304L thin-walled shells under cyclic pure bending load., Modares Mechanical Engineering, 16 (2016) 324-332. (In Persian)