Mechanism of Mechanical Analysis on Torsional Buckling of U-Shaped Bellows in FLNG Cryogenic Hoses

Round 1

Reviewer 1 Report

Relevant topic and commendable methodological approach. However, grammar needs improvement to enhance readability and improve understanding.

I have made comments embellished within the yellow highlights. Ensure you respond to comments and suggestions

In addition, topic should be rephrased. I have provided a suggestion.

 

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

This paper has been devoted to study the torsional buckling behavior of U-shaped bellows. Moreover, the effect of structural design parameters on hose stability performance has been investigated as well. The topic of the research is interesting. Some major points should be considered by the authors, as follows:

- The abstract of the research should be improved. The main novelty of the research should be bolded in this part. Moreover, the main general result which has been obtained from this study should be presented at the end of this part. 

- "Nonlinear structural analysis" is not an appropriate keyword. This keyword should change. 

- According to Figure 3, R0+h should be equal to R1 while in Table 1, this issue is not correct!

- The FE software used in this study should be discussed. 

- In the caption of Fig. 3, "Cross-section structure" should change to "Cross-section".

- In table 1, "structure" should change to "structural" or "geometric".

- Which type of steel has been used in this study? The material properties and the details of input data in FE software should be explained. 

- The details and procedure of obtaining the torsional buckling analysis in FE software should be explained. 

- How did the authors verify the obtained numerical results? Is there any other numerical study in which this simulation has been implemented?

- Why did the authors investigate only the clamped-free boundary condition? Please explain. 

- The literature review of the article can be improved. Following researches are suggested:

* Buckling considerations for U-shaped bellows utilized in flexible metal hoses. In ASME Pressure Vessels and Piping Conference, vol. 4188, pp. 127-135. 2005. 

* Critical buckling moment of functionally graded tapered mono-symmetric I-beam. Steel and Composite Structures, An International Journal 39.5 (2021): 599-614.

* Investigation of Stresses in U-Shaped Metal Bellow Using EJMA Standards." ADMT Journal 10, no. 2 (2017): 25-35.

* Lateral-Torsional Buckling of a Bidirectional Exponentially Graded Thin-Walled C-Shaped Beam." Mechanics of Composite Materials 58, no. 1 (2022): 53-68.

- The format of the caption of some figures has wrongly changed.

- In line 390, there is a wrong phrase "Error! Reference source not found.". Please correct it.

- Figure 21 seems to be not true. What is the meaning of critical torque in the experiment? Is it mean that the critical torque for all torsion angles and all thicknesses is the same?

- The conclusion part should be improved. Some major results which have been only obtained from this study should be presented point by point. In addition, some parts of the conclusion can be summarized. 

- The English language of the article should be strongly improved grammatically and lexically. This issue causes difficulty in reading and understanding some parts. 

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

The paper may be accepted as is.

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

All revisions have been done. Only the correct form of the references 18 and 19 is:

18. Rezaiee-Pajand, M.; Masoodi, A.R.; Alpaighambar, A. Critical buckling moment of functionally graded tapered mono-symmetric I-beam. Steel and Composite Structures. 2021, 39 (5), 599-614. 610

19. Rezaiee-Pajand, M.; Masoodi, A.R.; Alpaighambar, A. Lateral-Torsional Buckling of a Bidirectional Exponentially Graded Thin-Walled C-Shaped Beam. Mechanics of Composite Materials. 2022, 58 (1), 53-68.