OS0909-388 Plastic collapse strength evaluation of notched stainless pipes under the combined load considering load history

This paper is evaluates the effects of load history on the plastic collapse load of stainless steel members with a single-edge notch. It considers, both the tension force due to an internal pressure and the bending moment caused by an earthquake, considered as load cases for a structure. Experimental equipment was specially developed to cope with the indeterminate problems in fracture mechanics. In this experiment, the stress state of a plastic collapse point was assessed using a membrane stress and axial displacement chart as well as a bending stress and deflection angle chart, which is well known as the ligament method. As a result, we successfully developed a new method for assessing plastic collapse under a complex load. We found that a different load history affects the formation of the plastic region and the collapse point position. The effects of load history on the plastic collapse load were not very big.

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Plastic Collapse Evaluation for Multiple Circumferential Flaws in a Pipe

Volume 1: Codes and Standards ◽

10.1115/pvp2008-61420 ◽

2008 ◽

Cited By ~ 6

Author(s):

Hideo Machida ◽

Yoshiaki Takahashi ◽

Yusuke Nakagawa

Keyword(s):

Weld Joint ◽

Assessment Method ◽

Plastic Collapse ◽

Correction Factors ◽

Stability Assessment ◽

Japan Society ◽

Multiple Stress ◽

Primary Loop ◽

Collapse Strength ◽

Recirculation System

Multiple stress corrosion cracks initiate in a weld joint of primary loop recirculation system (PLR) piping in many cases. To prepare a stability assessment method for a pipe with these flaws is one of the major interests for Fitness-for-Service (FFS) Codes of Japan Society of Mechanical Engineers (JSME). This paper presents plastic collapse assessment method of a pipe with multiple circumferential flaws and proposals to revise FFS Codes. Plastic collapse strength of a pipe with multiple circumferential flaws is evaluated with respect to the weakest axis where the minimum plastic collapse moment is obtained, and a program assessing the weakest axis is presented in this study. A ratio of collapse strength corresponding to the weakest axis to that putting all cracks together is defined as strength correction factor, FMC. The strength correction factors when the number of flaws is two and three are summarized in the assessment diagrams, and proposals to revise FFS Codes are reported based on these results.

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Load history effect on plastic collapse in a notched SUS304 piping subjected to combined tension and bending

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2002.2.0_231 ◽

2002 ◽

Vol 2002.2 (0) ◽

pp. 231-232

Author(s):

Satoru IZAWA ◽

Masaaki MATSUBARA ◽

Kikuo NEZU ◽

Kenji SAKAMOTO ◽

Masayuki KONDO ◽

...

Keyword(s):

Plastic Collapse ◽

Load History ◽

History Effect

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Evaluation of the Mechanical Properties of Lightweight Lattice Structures Subjected to Compressive Loading : 1st Report, Analytical Approach for the Initial Stiffness and Plastic Collapse Strength

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.75.572 ◽

2009 ◽

Vol 75 (753) ◽

pp. 572-579 ◽

Cited By ~ 3

Author(s):

Kuniharu USHIJIMA ◽

Wesley James CANTWELL ◽

Dai-Heng CHEN

Keyword(s):

Mechanical Properties ◽

Analytical Approach ◽

Compressive Loading ◽

Plastic Collapse ◽

Lattice Structures ◽

Initial Stiffness ◽

Collapse Strength

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Examination of Commercial Casing Collapse Strength Under Axial Loading

Journal of Energy Resources Technology ◽

10.1115/1.3230426 ◽

1982 ◽

Vol 104 (4) ◽

pp. 343-348 ◽

Cited By ~ 4

Author(s):

T. Tamano ◽

Y. Inoue ◽

H. Mimura ◽

S. Yanagimoto

Keyword(s):

Axial Load ◽

Axial Stress ◽

Axial Loading ◽

External Pressure ◽

Plastic Collapse ◽

Slight Effect ◽

Collapse Pressure ◽

Minimum Value ◽

Collapse Strength ◽

Casing Collapse

Collapse testing of commercial API grade 7-in. casing was conducted under combined external pressure and axial load. The measured collapse pressure was considerably higher than the API minimum value, especially for the large D/t ratio, as expected. For the casings of large D/t ratio, the measured collapse pressure was a little smaller than the theoretical value for ideal pipe and the axial stress had a slight effect on the collapse pressure. In the range of plastic collapse, the measured collapse pressure was not less than the yield pressure for ideal pipe except near the boundary of the elastic and plastic collapse ranges.

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