The workability diagram is often used for predicting ductile fracture in metal forming processes. In most cases, experiments in which fracture occurs at traction free surfaces are used for constructing this diagram. However, ductile fracture often occurs in the vicinity of surfaces with high friction where mechanical material behaviour is quite different from that in conventional material tests. It is therefore of importance to design and carry out an experimental program to verify the validity of ductile fracture criteria based on the workability diagram in the vicinity of frictional interfaces.
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