Study of Energy Evolution Law and Damage Characteristics during Uniaxial Cyclic Loading and Unloading of Sandstone
Round 1
Reviewer 1 Report
In this manuscript, the authors analyzed the behavior of a sandstone subjected to cyclic loading created by uniaxial compressive forces applied on a press. The main objective is to study the energy evolution and to see the appearance of cracking mechanisms during the test.
In the opinion of the reviewer, the paper can be recommended for publication in the Journal of applied science after minor revision, taking into account the following remarks:
- The abstract paragraph should be placed after the title.
- Delete one of the ``:`` after the title of the abstract.
- The font of the abstract paragraph should be the same as that of the other sections.
- Add a title for the introduction section
- The latest 2022 references should be added to the introduction section to check for the latest advances in the field.
- In section 2, the authors should present the material properties and characteristics of sandstone.
- Fig 3. It is better to specify the numerical values used on the loading path.
- Analyzing figure 7 it can be noted that there is a symmetry presenting the correlation between the elastic energy ratio and the dissipative energy ratio; the same difference exists in the different points of the two curves; why is this possible in such a test?
- 0.154MJ*m-3 , 0.246MJ*m-3 in the units remove the ``*`` and replaced it by a ``.``
- Figure 15 is not clear. The quality of the figure need to be improved
- The novelty of the current research need to be highlighted on the conclusion section
Author Response
Response Letter
We are very grateful to you for reviewing the paper so carefully. We have carefully considered the suggestion of Reviewer and make some changes. Responds to the reviewers' comments：
Reviewer #1
-The abstract paragraph should be placed after the title.
Response：We have place the abstract paragraph after the title.
- Delete one of the ``:`` after the title of the abstract.
Response：We have delete the ``:`` after the title of the abstract
- The font of the abstract paragraph should be the same as that of the other sections.
Response：We have revised it.
- Add a title for the introduction section
Response：We have add a title for the introduction section
- In section 2, the authors should present the material properties and characteristics of sandstone.
Response：We have presented the material properties and characteristics of sandstone
- Fig 3. It is better to specify the numerical values used on the loading path.
Response：We have specified the numerical values used on the loading path
- Analyzing figure 7 it can be noted that there is a symmetry presenting the correlation between the elastic energy ratio and the dissipative energy ratio; the same difference exists in the different points of the two curves; why is this possible in such a test?
Response：The sum of the elastic energy and the dissipated energy as a proportion of the input energy is 1, so the two curves will be symmetric about y=0.5. Under different loading rates, the elastic energy proportion and dissipative energy proportion curves of sandstone are also symmetric, but the specific values are different. Figure 7 shows two energy proportion curves at 0.5KN/s loading rate.It is possible to see such curves in the test.
- 0.154MJ*m-3 , 0.246MJ*m-3 in the units remove the ``*`` and replaced it by a ``.``
Response: We have removed the ``*`` and replaced it by a ``.``
- Figure 15 is not clear. The quality of the figure need to be improved
Response：Figure 15 has been reworked to improve clarity
- The novelty of the current research need to be highlighted on the conclusion section
Response：The innovation of this paper is reflected in Conclusion 3 and Conclusion 4. The innovations of this paper are as follows: 1. The damage variables of rock are defined from the energy point of view, which can describe the damage process of rock well and avoid the negative damage in previous studies. 2. 2. Based on the energy principle, the damage evolution process of rock is studied, and it is revealed that the damage evolution process of rock has the properties of bifurcation and chaos. 3. The results show that elastic energy accumulation and dissipative energy consumption have loading rate effect during sandstone failure, which is different from previous studies. In the future, we can expand the loading rate range for different types of rocks.
Once again, I sincerely thank you for your meticulous and serious revision.
I wish you a happy life.
Yours sincerely!
Author Response File: 
Author Response.docx
Reviewer 2 Report
Kindly see my comments, as per the highlights.
Comments for author File: 
Comments.pdf
Author Response
Response Letter
We are very grateful to you for reviewing the paper so carefully. Your revision is very serious and careful, especially in terms of grammar and sentence fluency, and many important opinions are put forward. You are really a responsible editor. We have carefully considered the suggestion of Reviewer and make some changes. Responds to the reviewers' comments：
Reviewer #2
- The problem of incoherence in grammar and sentences.
Response: All of them have been modified in this paper.
Alphabet symbol editing problem.
Response: Re-edited with a professional editor.
-The problem of citing references.
Response: Quoted the recommended good papers.
-Explanation of Kaiser effect.
Response: Explanation of Caesar effect. Kaiser effect refers to the phenomenon that acoustic emission rarely occurs when the load does not exceed the maximum load of the previous load when the object is loaded and unloaded again. When the load exceeds the maximum load of historical load, the acoustic emission phenomenon is active. It is reflected in the text
-Explanation of "saturation"
Response: There are various microscopic deformation mechanisms in strain hardening and strain softening, and each mechanism will consume external energy. If one mechanism strengthens, it consumes more energy, thus inhibiting the action of other deformation mechanisms. When the temperature and pressure of rock system change little, this effect cannot be infinitely enhanced. And because of other actions, it has not yet reached "saturation", that is, the limit of action. Therefore, other effects will inhibit the enhancement of this effect.
How can cumulative dissipation be calculated?
Response: In the whole deformation process, the dissipative energy calculated in the previous stages is summed
Other problems have been revised according to the author's opinion
Once again, I sincerely thank you for your meticulous and serious revision.
I wish you a happy life.
Yours sincerely!
Author Response File: Author Response.docx
