Ductile Fracture Prediction of X80 Pipeline Steel Using Void Growth Model
Round 1
Reviewer 1 Report
The paper presents the use of the Void Growth Model (VGM) to investigate the behavior of ductile fracture for X80 pipeline steel. In my opinion, the paper is of interest; moreover it is well written, with many references and both good experimental and numerical parts.
The paper, except for some typos, can be accepted for the publication.
Author Response
Dear reviewer,
This is the revised paper submission with the title: “Ductile fracture prediction of X80 pipeline steel using Void Growth Model”. The authors are very grateful for the valuable comments given by the reviewer. Corresponding changes and improvements have been made in the revised manuscript addressing all the comments as much as possible made by the reviewer. Detailed replies to the reviewer are given below.
Reply:
The authors would like to express their sincere gratitude to the reviewer for the approval. The typos have already been corrected, such as:
1 Offshore Department, Sinopec Petroleum Engineering Corporation, Dongying 257026, China
2 State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
3 School of Hydraulic Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China
4 College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
29. Brünig, M.; Gerke, S.; Schmidt, M., Damage and failure at negative stress triaxialities: Experiments, modeling and nu-merical simulations. International Journal of Plasticity 2018, 102, 70-82.
Please see the attachment with the revised manuscript.
Reviewer 2 Report
The article is devoted to the analysis of fracture toughness of pipe steels. The authors obtained results that are valuable for science and practice. But there are also a number of questions for the authors:
- …18… The meaning of the phrase "The toughness capacity is determined to be 4.304" is not clear. Please rephrase it.
- …5… The word "Affiliation …1,2,3,4" must be removed.
- …98… deformations are indicated in "bold" font. I think they need to be made by normal font.
- Equations (1)-(7) include many values, coefficients, etc., it is necessary to show their values for the investigated steel, in a separate table or in supplemented table 1.
- The fracture toughness of main gas pipelines can be investigated by cutting and examining samples of local sections of pipes during their repair, for example, a new method for such control is shown in the article: https://www.mdpi.com/1996-1944/12/3/491. I propose to add its analysis to the introductory part of this article.
- The article carried out interesting laboratory research. But how can they be used to analyze the state of the metal of a real pipe? I propose to explain this to the readers. Because without these explanations, the article remains unfinished. How to move from the investigated parameters to the well-known engineering mechanical properties of pipes recommended by the standards? After all, none of the obtained characteristics is described in the standards for the properties of pipe metal.
Author Response
Dear reviewer,
This is the revised paper submission with the title: “Ductile fracture prediction of X80 pipeline steel using Void Growth Model”. The authors are very grateful for the valuable comments given by the reviewer. Corresponding changes and improvements have been made in the revised manuscript addressing all the comments as much as possible made by the reviewer. Detailed replies to the reviewer can be found in the attachment.
Author Response File: 
Author Response.pdf
Reviewer 3 Report
The presented article presents an interesting and logically arranged work with a practical and theoretical background at the appropriate level. I have no comments on this article and recommend that it be published.
Author Response
Dear reviewer,
The authors are truly grateful for the reviewer's approval.
Thanks and best regards,
Zengli Peng
Reviewer 4 Report
Dear authors,
The manuscript under review concerns a very interesting and important issue related to the detection of ductile cracks in piping steels. The manuscript is well written, the section organization is correct and legible. However, before publication, I suggest that the authors supplement the manuscript with the following elements: 1. In the abstract, the authors do not clearly indicate what is new, or the application of the method or the testing of pipeline steels. This should be explained in the abstract. 2. In the theoretical part, the authors provide other methods - I suggest to emphasize the differences between the methods and the advantages of the objectionable one - this element is not entirely clear-cut. 3. The authors did not define the limitations of the adopted research methodology or the adopted model is devoid of limitations and simplifications? 4. The authors clearly described and explained the place of crack initiation - everything is clear and legible here. However, in the case of propagation, the authors simplified the description of the mechanical propagation.
Please check the correctness of the citations. Line 359 is it position 27 or 29?
To sum up, a very interesting publication describing very important issues related to the fracture mechanics.
Author Response
Dear reviewer,
This is the revised paper submission with the title: “Ductile fracture prediction of X80 pipeline steel using Void Growth Model”. The authors are very grateful for the valuable comments given by the reviewer. Corresponding changes and improvements have been made in the revised manuscript addressing all the comments as much as possible made by the reviewer. Detailed replies to the reviewer can be found in the attachment.
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
Accept
