Abstract
Using the two-dimensional drawing-type friction testing machine reported in the 2nd report, the experiments on aluminium sheets have been first carried out. The following have been concluded. (1) The frictional shear stress τf on the blank-holder surface is proportional to a real contact pressure Pr in every lubricant. This is similar to that obtained on the sheet metal drawing and the U-bending reported previously. After all it has been concluded that τf is not influenced by the plastic deformation but by Pr only, on the frictional surface where the apparent surface area does not increase. (2) The values of τf on the die surface are always larger than those on the blank-holder surface. It has been found newly that τf is influenced by an increase of the apparent surface area besides Pr, on the die surface. (3) Variations of τf on both the blank-holder and the die surface correspond consistently to variations of the appearance of the frictional surfaces. (4) Consequently, it has been concluded that the bulk plastic deformation influences mainly the frictional mechanism through an increase of apparent surface area.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
