A study of the law of plastic flow of metals

These tests were conducted at the Watertown Arsenal by the Army Ordnance Department in a series of tests on thick-walled cylinders. To develop the required hydraulic pressures an 18:1 intensifier was used in a series with a high pressure water pump. A Crosby test gage was used on the low side of the intensifier and readings were corrected from calibration of the intensifier. Pressure was also checked by the electrical resistance of a manganin coil in the high pressure line. Elastic material: The relation of combined stress in elastic material is in accordance with the strain theory as proposed by St. Venant. Plastic material: 1. The plastic (or converted) strain theory with m = 2 is the correct combined stress relation for plastic materials. 2. The true stress-strain diagram or true stress-true elongation (reduction of area) diagram should be used. Residual stresses: Residual stresses are caused by the differences of the permanent stretch given a fiber and the residual strain remaining in this fiber after removing the load. Failures of cylinders: The properties of the material and dimensions of the cylinder determine the radius where failure begins.

Name thesis:degree_name

M.S.

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Mechanical Engineering

Department dc:contributor.department

Mechanical Engineering

Grantor dc:publisher

Virginia Agricultural and Mechanical College and Polytechnic Institute

Year dc:date.issued

1930

Author dc:creator

• Cockrell, C. M.

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Handle dc:identifier.uri

http://hdl.handle.net/10919/110196

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/110196