The failure due to accidental drop of magnetic recording disks made of brittle or ductile materials is of great interest in the design of small form factor hard disk drives. In this study, fracture of glass disks (brittle material) and plastic deformation of aluminum disks (ductile material) at very high shock levels caused by accidental drop are investigated using finite element analysis. It is found that failure inception for both disk types occurs at the inside perimeter of the disk. For glass disks, cracks are found to propagate toward the outer perimeter of the disk along distinct radial lines associated with the largest bending moment of the disk. The critical shock level at which failure originates increases with an increase in the clamp diameter, a reduction in the disk diameter, and an increase in the thickness of the disk. Some experimental results are presented to validate the numerical model.
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e-mail: john@talkelab.ucsd.edu
e-mail: etsion@technion.ac.il
e-mail: ftalke@ucsd.edu
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November 2009
Research Papers
Failure of Brittle and Ductile Hard Disks Due to High Shock Levels
Jianfeng Xu,
Jianfeng Xu
Center for Magnetic Recording Research,
e-mail: john@talkelab.ucsd.edu
University of California
, San Diego 9500 Gilman Drive, La Jolla, CA 92093
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Izhak Etsion,
Izhak Etsion
Fellow ASME
Department of Mechanical Engineering,
e-mail: etsion@technion.ac.il
Technion
, Haifa 32000, Israel
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Frank E. Talke
Frank E. Talke
Fellow ASME
Center for Magnetic Recording Research,
e-mail: ftalke@ucsd.edu
University of California
, San Diego 9500 Gilman Drive, Mail Code 0401, La Jolla, CA 92093
Search for other works by this author on:
Jianfeng Xu
Center for Magnetic Recording Research,
University of California
, San Diego 9500 Gilman Drive, La Jolla, CA 92093e-mail: john@talkelab.ucsd.edu
Izhak Etsion
Fellow ASME
Department of Mechanical Engineering,
Technion
, Haifa 32000, Israele-mail: etsion@technion.ac.il
Frank E. Talke
Fellow ASME
Center for Magnetic Recording Research,
University of California
, San Diego 9500 Gilman Drive, Mail Code 0401, La Jolla, CA 92093e-mail: ftalke@ucsd.edu
J. Mech. Des. Nov 2009, 131(11): 111007 (8 pages)
Published Online: October 13, 2009
Article history
Received:
March 20, 2009
Revised:
August 28, 2009
Published:
October 13, 2009
Citation
Xu, J., Etsion, I., and Talke, F. E. (October 13, 2009). "Failure of Brittle and Ductile Hard Disks Due to High Shock Levels." ASME. J. Mech. Des. November 2009; 131(11): 111007. https://doi.org/10.1115/1.4000238
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