Experimental and Numerical Study of Cyclic Stress–Strain Response and Fatigue Crack Initiation Life of Mid-Carbon Steel under Constant and Multi-Step Amplitude Loading
Round 1
Reviewer 1 Report
The presented manuscript concerns the research of fatigue cyclic deformation behavior of mid-carbon steel under experimental and numerical conditions. The Authors presented an interesting study and methodology for predicting the durability of fatigue crack initiation. The manuscript is carefully compiled and the presented results are very well commented, including discussion based on the work of other authors. I have practically no substantive remarks to the work, the minor proofreading remarks noticed do not require any comment in this regard.
I recommend the work in the presented form for further consideration in this journal.
Author Response
Thank you very much for providing valuable comments. We are thankful for the time and energy you expended. We made no change regarding your comment.
Reviewer 2 Report
In this paper, the elastic and plastic deformation behaviors under cyclic loading are analyzed experimentally and numerically, respectively. Fatigue SS models are used to describe the nonlinear material behavior of materials. The cumulative plastic work was introduced to predict the fatigue crack initiation life under variable loading conditions.
The paper has clear ideas, complete structure and correct conclusions, which contribute to the development and application of the theory of fatigue fracture behavior and life evaluation of metal materials. Some of the deficiencies in the paper are discussed below:
1. The paper should have a complete description of the model building process
2. The description of each figure in the paper can be further refined;
3. Whether the prospect in the conclusion is appropriate.
4. The English abbreviation should be the full name when it first appears
5. In Fig. 7. The legend text is incomplete.
Author Response
Thank you very much for providing valuable comments. We are thankful for the time and energy you expended. Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 3 Report
The paper is well written and requires minor revision. A list of various suggestions is reported in the following.
One observation is relevant to the number of self-citations, which is 14 (if I have not made a mistake), which is high, particularly in consideration of the significance of the concepts that are recalled.
Experimental and numerical study of cyclic stress-strain response and fatigue crack initiation life of mid-carbon steel under constant and multi-step amplitude loading (jmse-1967364)
Authors: K. Morita, M. Mouri, R. Fincato and S. Tsutsumi
Notes, typos, request for changes:
Page 1, line 10: remove the last word (steps)
Page 1, line 17: change "has" with "is", the sentence becomes:
The main feature of the FSS model is the ability.....
Page 1, line 26: change "stresses or strains" in "stress and strain".
Page 1, line 31: "typical" seems preferable to "proper"
Page 1, line 32: better "observed in" than "investigated for".
Page 2, line 44: insert "a", so that the sentence sounds: developed a
continuum damage....
Page 2, line 46: also here insert "a", proposed a damage accumulation model
Page 2, line 65: at the beginning, better "only on" than "on only".
Page 2, line 67: change to: "safe design of bridges"
Page 2, line 88: I presume that more than one specimen has been prepared,
so "The specimens were machined..". And in the last line of the page,
"a" specimen is bettere than "the" specimen (as if it were really just one).
Page 3, line 93: change the caption, Specimen microstructure.
Page 3, line 109: also here in the caption, better "specimen diameter".
Page 4, line 112: clarify, a strain rate cannot be expressed in mm/min.
Page 4, line 119: again a caption, change the last word into tests.
Page 5, line 151: again a caption, I would prefer to remember the reader that
the tests have been carried out under constant strain amplitude loading;
so, please, add "strain".
Page 6, line 164: delete "for".
Page 6, line 172: again a caption, the strain range symbol is missing.
Page 6, line 194: Table 4 is introduced, with a number of parameters for
the description of the material elasto-plastic behaviour, but an equation
is needed, to show the meaning and the role of each parameter.
Page 10, line 269: evidently captions are a weak point! The figure number is 13.
Page 10, line 272: the figure recalled is 14.
Page 10, line 276: caption, figure 14.
Page 11, line 343: Please, change to lowercase font, as in the rest of the references.
Author Response
Thank you very much for providing valuable comments. We are thankful for the time and energy you expended. Please see the attachment.
Author Response File: Author Response.pdf
