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Examination and modification of equivalent delamination factor for assessment of high speed drilling
J. Babu,Nevin Paul Alex,Keerthy P. Mohan,Jose Philip,J. P. Davim 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.11
Composite components suffer delamination at the entrance and exit of drilled holes. Many measures have been suggested by different researchers to assess such delamination damage. These include delamination factor, two-dimensional delamination factor, damage ratio, adjusted delamination factor, refined delamination factor, equivalent delamination factor, and minimum delamination factor. Among all these various assessment factors, the equivalent delamination factor looks simple and able to take into account the different features of delamination. However, the method of calculation of the equivalent delamination factor may not provide accurate values for delamination resulting from high speed drilling. The aim of this paper is to evaluate the equivalent delamination factor in high speed drilling of a composite laminate using a twist drill and develop a new approach to determine equivalent delamination factor which can be used for both conventional and high speed drilling conditions. This new method is applied to calculate the equivalent delamination factor in trials of drilling composite specimens at different speeds and feed rates and is found suitable.
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Lubrication Aspects during Single Point Incremental Forming for Steel and Aluminum Materials
Nelson Gil Azevedo,João Sá Farias,Ricardo Pereira Bastos,Pedro Teixeira,João Paulo Davim,Ricardo Jose Alves de Sousa 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
Over the past few years, Single Point Incremental Forming (SPIF) has been mainly studied regarding formability, forming forcesinvolved and the dimensional accuracy achieved in the final product. As in any other metal forming process, the choice of thelubricant depends on the deformation mechanisms that characterize the process, the roughness of the material involved and on theprocess parameters. Despite the recent developments on SPIF, little attention has been paid to the influence of lubricants used duringthe process. This study intends to evaluate the influence of the type of lubricant used in SPIF process, particularly on aluminum 1050and DP780 steel sheets, in what concerns the surface quality of final parts. To do so, tests were performed employing a range ofdistinct lubricants. Roughness tests were conducted to evaluate surface quality. Results show opposite trends for aluminum and steelin the sense that lubricants that guarantee better results in aluminum proved to have worse results in steel and vice-versa.
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