자료유형  

 학위논문

Control Number  

0017165170

International Standard Book Number  

9798346830511

Dewey Decimal Classification Number  

001

Main Entry-Personal Name  

Magesh, Agraja.

Publication, Distribution, etc. (Imprint  

[S.l.] : Purdue University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

203 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-06, Section: B.

General Note  

Advisor: Sundararajan, Raji.

Dissertation Note  

Thesis (Ph.D.)--Purdue University, 2024.

Summary, Etc.  

요약This study investigated the effects of single-stage and multi-stage (two, three, or four) mandrel cold-forming processes on stainless steel U-shaped, thin-walled profiles, with a particular focus on their impact on stress. These profiles, commonly used as metal expansion joints (also known as compensators or bellows), are essential components in industries such as aerospace, energy, and piping systems. The need for these joints to absorb thermal expansion and mechanical movement while maintaining structural integrity makes precise forming processes critical. In particular, the investigation examined the effects of incrementally increasing the number of forming stages, from one to four, on profile geometry, with particular emphasis on thickness variation, consistency, and stress distribution. Profile geometry and thickness were assessed using three-dimensional scanning, a coordinate measuring machine, and ultrasonic thickness measuring techniques. While these methods have limitations, they provide valuable insights into the formed profiles. Increasing the number of forming stages up to four reduced thickness variation by up to 5%, producing profiles that were more closely aligned with the theoretical design specifications. Stress, a crucial factor in the long-term performance of metal expansion joints, was also reduced by increasing the number of forming stages by up to 6% with four stages. Further reductions in stress and thickness variation could be achieved with more than four stages, though the improvements became less significant. A formula was developed to determine the minimum number of forming stages (Nmin) required for thin-walled U-profiles. Depending on the application, additional stages beyond Nminimproved profile accuracy and further reduced stress, offering manufacturers flexibility in meeting performance requirements.

Subject Added Entry-Topical Term  

Software.

Subject Added Entry-Topical Term  

Cold.

Subject Added Entry-Topical Term  

Investigations.

Subject Added Entry-Topical Term  

Metal forming.

Subject Added Entry-Topical Term  

Design specifications.

Subject Added Entry-Topical Term  

Aerospace engineering.

Subject Added Entry-Topical Term  

Stress concentration.

Subject Added Entry-Topical Term  

Stress analysis.

Subject Added Entry-Topical Term  

Vibration.

Subject Added Entry-Topical Term  

Linear equations.

Subject Added Entry-Topical Term  

Metal fatigue.

Subject Added Entry-Topical Term  

Decision making.

Subject Added Entry-Topical Term  

Flexibility.

Subject Added Entry-Topical Term  

Stainless steel.

Subject Added Entry-Topical Term  

Deformation.

Subject Added Entry-Topical Term  

Geometry.

Subject Added Entry-Topical Term  

Materials science.

Added Entry-Corporate Name  

Purdue University.

Host Item Entry  

Dissertations Abstracts International. 86-06B.

Electronic Location and Access  

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Control Number  

joongbu:655410