BIFURCATION BUCKLING ANALYSIS AND NON-LINEAR COLLAPSE ANALYSIS OF TEARDROP SHAPED VACUUM CHAMBER

Hao Jiang; Charlotte Barbier; Bernie Riemer

doi:10.1115/PVP2022-82187

BIFURCATION BUCKLING ANALYSIS AND NON-LINEAR COLLAPSE ANALYSIS OF TEARDROP SHAPED VACUUM CHAMBER

Hao Jiang
, Charlotte Barbier
, Bernie Riemer

Source Development and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The Spallation Neutron Source (SNS) accelerator is being upgraded to increase the beam power from 1.4MW at 1GeV to 2.8MW at 1.3GeV. The currents in the middle two injection chicane magnets cannot simply be scaled up to accommodate the increased injection energy of 1.3GeV due to potential excessive H^- stripping; the magnets must be replaced with longer, lower-field magnets and the associated vacuum chambers need to be redesigned. A new teardrop-shaped vacuum chamber was initially designed to accommodate the new magnets and the updated beam paths and instrumentation. This paper focuses on the structural stability study of the teardrop shape vacuum chamber based on buckling analysis. Protection against collapse from buckling according to the ASME BPVC requirement has been evaluated in depth. First, a Type-1 bifurcation buckling analysis using a linear eigenvalue solution to determine the critical load factor was performed. Subsequently, a Type-3 nonlinear collapse analysis was conducted using the static Riks method with elastic-plastic material properties and imperfections explicitly considered in the model geometry. The critical buckling load for the teardrop shape vacuum chamber was confidently estimated based upon this two-stage approach.

Original language	English
Title of host publication	Computer Technology and Bolted Joints; Design and Analysis
Publisher	American Society of Mechanical Engineers (ASME)
ISBN (Electronic)	9780791886151
DOIs	https://doi.org/10.1115/PVP2022-82187
State	Published - 2022
Event	ASME 2022 Pressure Vessels and Piping Conference, PVP 2022 - Las Vegas, United States Duration: Jul 17 2022 → Jul 22 2022

Publication series

Name	American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume	2
ISSN (Print)	0277-027X

Conference

Conference	ASME 2022 Pressure Vessels and Piping Conference, PVP 2022
Country/Territory	United States
City	Las Vegas
Period	07/17/22 → 07/22/22

Funding

The authors would like to acknowledge the contributions of Drew Winder for providing insightful advice and reviewing the paper. The SNS is sponsored by the Office of Science, U.S. Department of Energy, and managed by UT-Battelle, LLC under contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.

Keywords

buckling
geometric non-linearity
non-linear collapse analysis
teardrop-shaped vacuum chamber

Access to Document

10.1115/PVP2022-82187

Cite this

Jiang, H., Barbier, C., & Riemer, B. (2022). BIFURCATION BUCKLING ANALYSIS AND NON-LINEAR COLLAPSE ANALYSIS OF TEARDROP SHAPED VACUUM CHAMBER. In Computer Technology and Bolted Joints; Design and Analysis Article V002T03A028 (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 2). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2022-82187

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title = "BIFURCATION BUCKLING ANALYSIS AND NON-LINEAR COLLAPSE ANALYSIS OF TEARDROP SHAPED VACUUM CHAMBER",

abstract = "The Spallation Neutron Source (SNS) accelerator is being upgraded to increase the beam power from 1.4MW at 1GeV to 2.8MW at 1.3GeV. The currents in the middle two injection chicane magnets cannot simply be scaled up to accommodate the increased injection energy of 1.3GeV due to potential excessive H- stripping; the magnets must be replaced with longer, lower-field magnets and the associated vacuum chambers need to be redesigned. A new teardrop-shaped vacuum chamber was initially designed to accommodate the new magnets and the updated beam paths and instrumentation. This paper focuses on the structural stability study of the teardrop shape vacuum chamber based on buckling analysis. Protection against collapse from buckling according to the ASME BPVC requirement has been evaluated in depth. First, a Type-1 bifurcation buckling analysis using a linear eigenvalue solution to determine the critical load factor was performed. Subsequently, a Type-3 nonlinear collapse analysis was conducted using the static Riks method with elastic-plastic material properties and imperfections explicitly considered in the model geometry. The critical buckling load for the teardrop shape vacuum chamber was confidently estimated based upon this two-stage approach.",

keywords = "buckling, geometric non-linearity, non-linear collapse analysis, teardrop-shaped vacuum chamber",

author = "Hao Jiang and Charlotte Barbier and Bernie Riemer",

note = "Publisher Copyright: Copyright {\textcopyright} 2022 by ASME.; ASME 2022 Pressure Vessels and Piping Conference, PVP 2022 ; Conference date: 17-07-2022 Through 22-07-2022",

year = "2022",

doi = "10.1115/PVP2022-82187",

language = "English",

series = "American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP",

publisher = "American Society of Mechanical Engineers (ASME)",

booktitle = "Computer Technology and Bolted Joints; Design and Analysis",

}

Jiang, H, Barbier, C & Riemer, B 2022, BIFURCATION BUCKLING ANALYSIS AND NON-LINEAR COLLAPSE ANALYSIS OF TEARDROP SHAPED VACUUM CHAMBER. in Computer Technology and Bolted Joints; Design and Analysis., V002T03A028, American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, vol. 2, American Society of Mechanical Engineers (ASME), ASME 2022 Pressure Vessels and Piping Conference, PVP 2022, Las Vegas, United States, 07/17/22. https://doi.org/10.1115/PVP2022-82187

BIFURCATION BUCKLING ANALYSIS AND NON-LINEAR COLLAPSE ANALYSIS OF TEARDROP SHAPED VACUUM CHAMBER. / Jiang, Hao; Barbier, Charlotte; Riemer, Bernie.
Computer Technology and Bolted Joints; Design and Analysis. American Society of Mechanical Engineers (ASME), 2022. V002T03A028 (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 2).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Riemer, Bernie

PY - 2022

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N2 - The Spallation Neutron Source (SNS) accelerator is being upgraded to increase the beam power from 1.4MW at 1GeV to 2.8MW at 1.3GeV. The currents in the middle two injection chicane magnets cannot simply be scaled up to accommodate the increased injection energy of 1.3GeV due to potential excessive H- stripping; the magnets must be replaced with longer, lower-field magnets and the associated vacuum chambers need to be redesigned. A new teardrop-shaped vacuum chamber was initially designed to accommodate the new magnets and the updated beam paths and instrumentation. This paper focuses on the structural stability study of the teardrop shape vacuum chamber based on buckling analysis. Protection against collapse from buckling according to the ASME BPVC requirement has been evaluated in depth. First, a Type-1 bifurcation buckling analysis using a linear eigenvalue solution to determine the critical load factor was performed. Subsequently, a Type-3 nonlinear collapse analysis was conducted using the static Riks method with elastic-plastic material properties and imperfections explicitly considered in the model geometry. The critical buckling load for the teardrop shape vacuum chamber was confidently estimated based upon this two-stage approach.

AB - The Spallation Neutron Source (SNS) accelerator is being upgraded to increase the beam power from 1.4MW at 1GeV to 2.8MW at 1.3GeV. The currents in the middle two injection chicane magnets cannot simply be scaled up to accommodate the increased injection energy of 1.3GeV due to potential excessive H- stripping; the magnets must be replaced with longer, lower-field magnets and the associated vacuum chambers need to be redesigned. A new teardrop-shaped vacuum chamber was initially designed to accommodate the new magnets and the updated beam paths and instrumentation. This paper focuses on the structural stability study of the teardrop shape vacuum chamber based on buckling analysis. Protection against collapse from buckling according to the ASME BPVC requirement has been evaluated in depth. First, a Type-1 bifurcation buckling analysis using a linear eigenvalue solution to determine the critical load factor was performed. Subsequently, a Type-3 nonlinear collapse analysis was conducted using the static Riks method with elastic-plastic material properties and imperfections explicitly considered in the model geometry. The critical buckling load for the teardrop shape vacuum chamber was confidently estimated based upon this two-stage approach.

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KW - geometric non-linearity

KW - non-linear collapse analysis

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T3 - American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP

BT - Computer Technology and Bolted Joints; Design and Analysis

PB - American Society of Mechanical Engineers (ASME)

T2 - ASME 2022 Pressure Vessels and Piping Conference, PVP 2022

Y2 - 17 July 2022 through 22 July 2022

ER -

Jiang H, Barbier C, Riemer B. BIFURCATION BUCKLING ANALYSIS AND NON-LINEAR COLLAPSE ANALYSIS OF TEARDROP SHAPED VACUUM CHAMBER. In Computer Technology and Bolted Joints; Design and Analysis. American Society of Mechanical Engineers (ASME). 2022. V002T03A028. (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP). doi: 10.1115/PVP2022-82187

BIFURCATION BUCKLING ANALYSIS AND NON-LINEAR COLLAPSE ANALYSIS OF TEARDROP SHAPED VACUUM CHAMBER

Abstract

Publication series

Conference

Funding

Keywords

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