The Anti-Fatigue Design of 80 t Depressed-Center Gondola Car Body

Round 1

Reviewer 1 Report

       i.            The 80t depressed-center gondola car for coke transportation is designed by the anti-fatigue design method in this paper.

     ii.            The car body with and without a supporting bar is simulated and analyzed by the finite element method.

  iii.            The fatigue lives of the two car body schemes are evaluated by Miner linear cumulative damage theory, spectrum and S-N curve in AAR standard, and load spectrum of Daqin line and S-N curve in BSI standard.

   iv.            According to the finite element analysis results, the maximum stresses of weld 1 under all conditions appear at 110mm

     v.            The maximum stresses of weld 2 under all conditions appear at 305mm.

   vi.            The damages of the two key positions are calculated by the load spectrum and fatigue damage assessment method in the AAR standard

vii.            Similarly, the damages are calculated by the load spectrum of the Daqin line and the S-N curve in the BSI standard

viii.            This shows that it uses two different methods to obtain damages.

   ix.            The total damage obtained from both method remains the same so, this cause waste of time.

     x.            By using a single method we can calculate the results.

   xi.            The material of the car body is not discussed.

xii.            Which will affect the final results of the paper like values of stress and damage

The use of different methods can create complications in the calculation.

Author Response

Thank you very much for your affirmation of our paper, and thank you for your valuable and thoughtful advice. Next, we will sincerely response your comments one by one.

Comment 1: The 80t depressed-center gondola car for coke transportation is designed by the anti-fatigue design method in this paper.

Response: Thank you very much for your comment. 

Comment 2: The car body with and without a supporting bar is simulated and analyzed by the finite element method.

Response: Thank you very much for your comment. 

Comment 3: The fatigue lives of the two car body schemes are evaluated by Miner linear cumulative damage theory, spectrum and S-N curve in AAR standard, and load spectrum of Daqin line and S-N curve in BSI standard.

Response: Thank you very much for your comment.

Comment 4: According to the finite element analysis results, the maximum stresses of weld 1 under all conditions appear at 110mm.

Response: Thank you very much for your comment.

Comment 5: The maximum stresses of weld 2 under all conditions appear at 305mm.

Response: Thank you very much for your comment. 

Comment 6: The damages of the two key positions are calculated by the load spectrum and fatigue damage assessment method in the AAR standard.

Response: Thank you very much for your comment. 

Comment 7: Similarly, the damages are calculated by the load spectrum of the Daqin line and the S-N curve in the BSI standard.

Response: Thank you very much for your comment. 

Comment 8: This shows that it uses two different methods to obtain damages.

Response: Thank you very much for your comment. 

Comment 9: The total damage obtained from both method remains the same so, this cause waste of time.

Response: In fact, although the total damage obtained from two different methods is not much different, the vertical damage and longitudinal damage are quite different, which is conducive to the detailed analysis. In addition, the damage of the Daqin-BSI is larger than that of the ARR, which is in line with reality.

Comment 10: By using a single method we can calculate the results.

Response: Your review is very correct. The method Daqin-BSI can be used for fatigue life assessment of wagon running on the Daqin line in China, and method AAR can be used for fatigue life assessment of wagon running in North America.

Comment 11: The material of the car body is not discussed.

Response: The Q450NQR1 has been adopted for the body in section 3.1, and the steel has become the most commonly used material for the manufacture of heavy-duty railway wagons in China now.

Comment 12: Which will affect the final results of the paper like values of stress and damage. The use of different methods can create complications in the calculation.

Response: At present, the materials used in the manufacture of depressed-center gondola car bodies are single(Q450NQR1), and there is no material that affects the performance of the car body.

Once again, thank you very much for your constructive comments and suggestions which would help us in depth to improve the quality of the paper.

 

Kind regards,

Wenfei Liu

E-mail: [email protected]

Author Response File: Author Response.doc

Reviewer 2 Report

The manuscript "The anti-fatigue design of 80t depressed-center gondola car body" is interesting, new and original. My recommendation is accept as is.

Author Response

Comments to the Author:

The manuscript "The anti-fatigue design of 80t depressed-center gondola car body" is interesting, new and original. My recommendation is accept as is.

Response: 

Thank you very much for your affirmation of our paper, and thank you for your approval of the article.

We wish you a happy life and work!

 

Kind regards,

Wenfei Liu

Author Response File: Author Response.doc

Reviewer 3 Report

1-Check is this reference can related to subject? YU-GUANG, Z. H. O. N. G., YONG, Z., & GE, Z. FATIGUE ANALYSIS OF STRUCTURE OF GONDOLA CAR BODY BASED ON RIGID-FLEXIBLE COUPLING MULTI-BODY SYSTEMS.   2- Figures 7 and 8 need more explanation and describing the results. 3-The conclusion should more explicitly express the achievement.

 

Author Response

Thank you very much for your affirmation of our paper, and thank you for your valuable and thoughtful advice. Next, we will sincerely response your comments one by one.

Comment 1: 1-Check is this reference can related to subject? YU-GUANG, Z. H. O. N. G., YONG, Z., & GE, Z. FATIGUE ANALYSIS OF STRUCTURE OF GONDOLA CAR BODY BASED ON RIGID-FLEXIBLE COUPLING MULTI-BODY SYSTEMS.

Response: Thank you very much for your advice. This reference has been added in the revised manuscript.

Comment 2: 2- Figures 7 and 8 need more explanation and describing the results.

Response: The related content have been revised based on your comments in section 3.3.

Comment 3: 3-The conclusion should more explicitly express the achievement.

Response: The conclusions have been revised based on your comments.

 

Once again, thank you very much for your constructive comments and suggestions which would help us in depth to improve the quality of the paper.

 

Kind regards,

Wenfei Liu

Author Response File: Author Response.doc