Experimental and Numerical Analysis of Electric Currents and Electromagnetic Blunting of Cracks in Thin Plates
Abstract
Electric currents in thin plates are analyzed numerically with emphasis on expanding the capabilities of existing finite element programs. Specifically, the ability to calculate transport currents is added to programs which originally computed only induced currents. The final programs are capable of handling transport currents alone or combined with induced currents generated by a transient external magnetic field. Experimental and analytical verification of the resulting program is presented. The second half of this study deals with the blunting of fatigue cracks by melting a hole at the crack tip by electromagnetic means. This technique is investigated experimentally for stainless steel 304 and titanium alloy Ti-6Al-4V. The blunting technique is described in detail, and the results from the testing program are presented. Analysis of the data emphasizes the hole sizes produced and their effect on the ultimate strength and fracture resistance of the test specimens. Electromagnetic blunting increases the ultimate static stress of stainless steel 304 plates by up to 19 percent and of Ti-6Al-4V by up to 78 percent. The effect of electromagnetic blunting on resistance to further fatigue remains to be investigated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1984
- Accession Number
- ADA150418
Entities
People
- F. C. Moon
- G. R. Doelp
- J. F. Abel
Organizations
- Cornell University