Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

Characterization of Failure Mechanisms in Cross Wedge Rolling

Li, Qiang (2003) Characterization of Failure Mechanisms in Cross Wedge Rolling. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

Primary Text

Download (3MB) | Preview


Cross wedge rolling (CWR) is a metal processing technology in which a heated cylindrical billet is plastically deformed into an axisymmetric part by the action of wedge shape dies moving tangentially relative to the workpiece. The CWR process offers several innovative and unique features over traditional machining operations. Despite these advantages, the CWR process has not been widely accepted throughout the manufacturing community, particularly in the U.S. This can mainly be attributed to complexities involved in CWR tool design. The design of CWR tooling is difficult because of the potential failure mechanisms that can be encountered during the CWR process. In this dissertation, extensive experimental investigation and numerical simulation have been performed to characterize the major failure mechanisms in cross wedge rolling. Based on the combined experimental and numerical analysis, criteria for predicting improperly formed workpiece cross section due to excess interfacial slip and internal defects due to the formation of internal voids have been determined. Based on these criteria, it is believed that the design of CWR tooling can be simplified, making CWR a more viable manufacturing process in the US.


Social Networking:
Share |


Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Li, Qiangqilst4@pitt.eduQILST4
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLovell, Michaelmlovell@pitt.eduMLOVELL
Committee MemberBidanda, Bopaya
Committee MemberOnipede, Dipo
Committee MemberSmolinski, Patrick
Committee MemberSlaughter, William
Date: 8 May 2003
Date Type: Completion
Defense Date: 11 March 2003
Approval Date: 8 May 2003
Submission Date: 19 March 2003
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Mechanical Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Friction model; Interfacial Slip; Internal Failure
Other ID:, etd-03192003-145647
Date Deposited: 10 Nov 2011 19:32
Last Modified: 15 Nov 2016 13:37


Monthly Views for the past 3 years

Plum Analytics

Actions (login required)

View Item View Item