Accession Number : AD0681360

Title :   THE ENLARGEMENT OF A HOLE IN A RIGID-WORKHARDENING DISK OF NON-UNIFORM INITIAL THICKNESS.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF THE AEROSPACE AND MECHANICAL ENGINEERING SCIENCES

Personal Author(s) : Chern,Jenn-Ming ; Nemat-Nasser,S.

Report Date : JAN 1969

Pagination or Media Count : 45

Abstract : A complete solution is obtained for the enlargement of a circular hole in a disk using an isotropic strain-hardening law with Mises' yield condition and its associated flow rule. The results are then compared with those obtained using: (1) Tresca's yield condition and its associated flow rule; (2) Mises' yield condition for the neutral plastic region, and Tresca's yield condition and the flow rule associated with the Mises yield criterion for the active plastic region; and (3) Tresca's yield condition for all plastic regions and the Saint Venant-Levy-Mises flow rule. An interesting feature of the results is that, when material hardening exists and when the Saint Venant-Levy-Mises flow rule is used, then, as the hole expands, there first occurs a thickening of the disk at the vicinity of the hole's edge, which thickening may then be followed by a thinning. It appears that this phenomenon has not been noticed before. (Author)

Descriptors :   (*METAL PLATES, MECHANICAL PROPERTIES), DISKS, MATHEMATICAL MODELS, STRAIN(MECHANICS), ELASTIC PROPERTIES, PLASTIC PROPERTIES, STRAIN HARDENING, STRESSES, COLD WORKING

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE