Page 275 - Fiber Fracture

258 K. Yoshida

(a) 4~5.5 rnrn -.. Q5.1 rnrn

(c> G4.5 rnm - lp4.5 rnm
Fig. 19. Internal fracture found during clad wiredrawing (a = 20").

h-
13'
13'
6'
Die half-angle a Die half-angle a
Fig. 20. Absence or presence of filament breakage in drawn wire (+ + 2.1).

indicating that the AE energy was extremely small; therefore, detection of the defects
was difficult.
In this study, the diameter of wire sample No. 3 was reduced from 4 4.2 to 4 1.3
under an RIP ratio of approximately 5% and a of 13", which are conditions under
which defects are likely to occur.
Fig. 23 shows the relationship between drawing length and AE output, and between
drawing length and drawing stress. As shown in Fig. 18, there were two drawing lengths