Page 258 - Fiber Fracture

Fiber Fracnrre
M . Elices and J . Llorca (Editors)
0 2002 Elsevier Science Ltd . AI1 rights reserved

FRACTURE OF SUPERFINE METALLIC

WIRES

K . Yoshida

.
Depurttnenf of Precision Mechunics. School of Engineering. Tr, kui Univer*sih> I I I7 Kitnkunume . Himrsukci .
Kunaguwu 259- 1292. Jupun

Introduction ..................................... 243
Present Condition of Production of Superfine Wires ................ 244
Minimum Diameter of Wires in Products ................... 244
Product Price and Quality Required for Superfine Wires ........... 245
Background of Research on Wire Breakage and Internal Fracture ......... 245
Dynamic Study on Internal Fracture and Wire Breakage ........... 246
Classification of Wire Breakage ........................ 247
FEA of Wire Breakage in Superfine Wiredrawing with Inclusion ......... 248
Analysis Method ................................ 248
Deformation Behavior with Inclusions ..................... 249
Increase in the Drawing Stress Due to Inclusions ............... 251
SizeofInclusionsattheTimeofOccurrenceof WireBreaks ......... 252
Simulation in Which Peeling at the Inclusion/Matrix Boundary is Considered 253
Filament Breakage during Composite Wiredrawing ................ 254
AE Detection of Filament Breaks and Internal Fracture ............ 254
Drawing of Cu-NbTi Superconducting Wire ................. 256
Conclusions ..................................... 260
Acknowledgements ................................. 261
References ...................................... 261

Abstract

The wire breaks and internal defects that occur during the drawing of superfine wires
were analyzed . The cause of defects in the wire has been treated from both plastody-
namic and metallurgical points of view . Wire breakage during the drawing process of
fine wires are often induced by inclusions in the wire material . It was clarified. by finite