A New Formula for Elasto-Plastic Collapse Strength of Thick-Walled Casing

1994 ◽  
Author(s):  
Yukihisa Kuriyama
Keyword(s):  
Plastic Collapse ◽  
Collapse Strength ◽  
New Formula

FEM Analysis of the Collapse Strength of a Tube

1986 ◽  
Vol 108 (2) ◽  
pp. 158-164 ◽  
Author(s):  
K. Tokimasa ◽  
K. Tanaka
Keyword(s):  
Residual Stress ◽  
Fem Analysis ◽  
Plastic Collapse ◽  
Round Tube ◽  
Collapse Pressure ◽  
Hardening Behavior ◽  
Collapse Strength ◽  
Inner Surface ◽  
Plastic Hardening ◽  
New Formula

Using the FEM program, the effects of geometry, residual stress and the elasticplastic behavior of material on the collapse strength of a tube is analyzed and the following results are obtained. The plastic collapse pressure is maximum when the circumferential residual stress on the inner surface is tensile and is equal to 0.7σy. The plastic collapse pressure of a perfectly round tube can be approximately estimated by the following equation independent of the plastic-hardening behavior of the material: P = 2σ0.04 (D/t − 1)/(D/t)2. Based on these FEM results, a new formula is presented to evaluate the collapse strength of a tube.

scholarly journals OS0820 Plastic collapse strength and maximum load evaluation method of flawed stainless piping subjected to axial tension and bending

2012 ◽  
Vol 2012 (0) ◽  
pp. _OS0820-1_-_OS0820-2_
Author(s):  
Seiji YANAGIHARA ◽  
Masaaki MATSUBARA ◽  
Ryousuke SUZUKI ◽  
Masato SUZUKI ◽  
Taisuke SHIRAISHI ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Maximum Load ◽  
Plastic Collapse ◽  
Axial Tension ◽  
Collapse Strength ◽  
Load Evaluation

Plastic Collapse Evaluation for Multiple Circumferential Flaws in a Pipe

2008 ◽  
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.

Examination of Commercial Casing Collapse Strength Under Axial Loading

1982 ◽  
Vol 104 (4) ◽  
pp. 343-348 ◽  
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.

scholarly journals Plastic Collapse Strength of Hatch Cover of Bulk Carrier against Green Sea Load (1st Report)

2000 ◽  
Vol 2000 (188) ◽  
pp. 517-524 ◽  
Author(s):  
Tetsuya Yao ◽  
Toshiro Koiwa ◽  
Shigehiro Hayashi ◽  
Shugo Satoh
Keyword(s):  
Plastic Collapse ◽  
Bulk Carrier ◽  
Collapse Strength
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