Delamination during drilling in polyurethane foam composite sandwich structures
The objective of this paper is to study the influence of drilling velocity, feed rate, and flank length on the delamination of polyurethane foam sandwich structures. A Taguchi-based design of experiments was used to assess the importance of the drilling parameters, and scanning electron microscopy (SEM) was used to assess the damage from drilling. The drilling of sandwich structures results in significant damage caused by delamination and surface roughness around the drilled holes. The drilling process was evaluated based on a factor called the delamination factor, which is defined as the ratio of the maximum diameter of the damage zone, measured using SEM, to the standard hole diameter (drill diameter). Analysis of variance of the experimental results showed that cutting speed was the most significant parameter among the controllable parameters during drilling of sandwich specimens followed by flank length and feed rate. Finally, confirmation tests were performed to make a comparison between the experimental results and the correlation results. The damage mechanisms are explained using SEM.
Keywordscutting speed drilling feed rate SEM Taguchi
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- 3.S.C. Sharma, H.N. Narasimha Murthy, and M. Krishna, Buckling Response of Stitched Polyurethane Foam Composite Sandwich Structures, J. Reinf. Plast. Compos., 2004, 23(17), p 18267–18277Google Scholar
- 4.S.C. Sharma, M. Krishna, and H.N. Narasimha Murthy, Effect of Foam Density and Skin Material on the Damping Behaviour of Polyurethane Sandwich Structures, J. Reinf. Plast. Compos., 2004, 23(12), p 1259–1266Google Scholar
- 9.H.H. Puw, On Drilling Characteristics of Fiber Reinforced Thermoset and Thermoplastics, Int. J. Manufact., 1992, 32(4), p 583–592Google Scholar
- 10.H.H. Puw and K. Yao, Experimental Aspects of Drilling Some Fiber Reinforced Plastics, Proc. Machining of Composite Materials, ASM Materials Week, Chicago, IL, 1992, p 127–128Google Scholar
- 11.G. Taguchi and S. Konishi, Taguchi Methods, Orthogonal Arrays and Linear Graphs, Tools for Quality Engineering, American Supplier Institute, Livonia, MI, 1987, p 35–38Google Scholar
- 12.P. Ross, Taguchi Techniques for Quality Engineering-Loss Function, Orthogonal Experiments: Parameter and Tolerance Design, McGraw-Hill, New York, 1988, p 10–50Google Scholar
- 14.H. Hocheng and C.K.H. Dharan, Delamination During Drilling in Composites Laminates, Trans. ASME, 1990, p 236–239Google Scholar