Failure Analysis of a Drop Tested Wall-Mounted Air Conditioner Indoor Unit: Simulation and Experimental Analysis

Year 2020, Volume: 33 Issue: 4, 843 - 855, 01.12.2020

Paşa Yayla Mehmet Fazlı Tekneci

https://doi.org/10.35378/gujs.673742

Abstract

Dynamic behavior of a wall-mounted air conditioner indoor unit is analyzed under drop impact condition. For simulation analysis, a finite element analysis code, known as Ansys Autodyn, is used. Physical drop tests are performed according to ASTM D5276 and ASTM D880 standards and strain gauges are used to measure the effective strains by attaching to specific areas subjected to excessive deformation. By recording drop test with high speed camera, the impact contact duration is also detected. By comparing experimental and numerical results, the validation of finite element analysis is performed. Product improvements are made for the damaged areas and validated by drop test. Conducting physical drop tests with strain gauges together with finite element analysis decreases product development lead time, reduces development costs and eliminates the product’s potential risks in advance. The approach presented with this work can be a reference guide for assessing the dynamic response of impact sensitive home and industrials applicants.

Keywords

Drop test, Failure analysis

Project Number

BAPKO FEN-E-080415-0111

References

• [1] ASTM D5276 (1998). Standard test method for drop test of loaded containers by free fall. American Society for Testing and Materials, West Conshohocken, PA, USA
• [2] ASTM D880 (2002). Standard test method for impact testing for shipping containers and systems. American Society for Testing and Materials, West Conshohocken, PA, USA
• [3] Asa, T., “Modelling the drop test of household oven with finite element method”. MSc Thesis, Istanbul Technical Univ., Istanbul, Turkey, 2015
• [4] Kim, W.J., Lee, B.Y., Son, B.S., “Drop-impact analysis and design of a package of a microwave oven”, Trans. Korean Soc. Mech. Eng., 33 (2009) 536-543
• [5] Kim, C.S., Bae, B.K., Sung, D.Y., “Drop analysis of a package and cushion performance of drum washing machine”, Trans. Korean Soc. Mech. Eng., 34 (2010), 1733-1740
• [6] Mulkoglu, O., Guler, M.A., Demirbag, H., “Drop test simulation and verification of a dishwasher mechanical structure”, Tenth European LS-DYNA Conference, Würzburg, Germany, 2015
• [7] Eraslan, S., “Modeling and drop test analysis of the built-in dish washer”, MSc Thesis, Istanbul Technical Univ., Istanbul, Turkey, 2015
• [8] Hong, S., Choi, Y.C., Eom, S.U., Kim, H.L., Hyun, H.C., “Finite element analysis of dynamic deformation of refrigerator’s lower hinge during drop test”, Trans. Korean Soc. Mech. Eng., 3 (2015) 37-44, 2015
• [9] Oh, W., Lim, S., Park, K.S., Park, N.C., Park, Y.P., Lee, J.S., Lee, H.B., “Design of modified shock isolators for the optical pickup in an ADD by analytical and experimental Methods”, Microsystem Technol. 19 (2013) 1615-1623
• [10] Lee, Y., Jung, U.J., Park, G.J., Han, I.S., Kim, T.K., “Optimization of the television packing system using equivalent static loads” Trans. Korean Soc. Mech. Eng. 39 (2015) 311-318
• [11] Low, K.H., Wang, Y., Hoon, K.H., Vahdati, N., “Initial global-local analysis for drop-impact effect study of TV products”, Advances in Engineering Software 35 (2004) 179–190
• [12] Yeh, M.K., Huang, T.H., “Drop test and finite element analysis of test board”, Procedia Engineering, 79 (2014) 238-243
• [13] Zhou, C.Y., Yu, T.X., Lee, R.S.W., “Drop/impact tests and analysis of typical portable electronic devices”, International Journal of Mechanical Sciences, 50 (2008) 905–917
• [14] Lacroix, C., Safran, G., “Modelisation of screen rupture during a mobile phone free fall”, Sixth European LS-DYNA Conference, Gothenburg, Germany, 2007
• [15] Wu, I.C. , Wang, M. H., Jang, L.S., “Experimental location of damage in microelectronic solder joints after a board level reliability evaluation”, Engineering Failure Analysis, 83 (2018) 131-140
• [16] ABS XG570, http://www.lgchem.com.tr/products/01122012-143947-astm-abs-xg570_eng.pdf , Access date: 10.01.2020
• [17] BASF Inc., Packaging with Strafor, Access address: http://styropor.basf.us/files/pdf/Packaging_with_Styropor.pdf, Access date:: 10.01.2020