Investigation on the Debonding Failure Model of Anchored Polyurea Coating under a High-Velocity Water Flow and Its Application
Round 1
Reviewer 1 Report
A significant amount of spelling and grammar corrections are necessary. The work was worth publication but the document needs to be written correctly.
Author Response
Point 1 : A significant amount of spelling and grammar corrections are necessary. The work was worth publication but the document needs to be written correctly.
Response：The spelling and grammar corrections of the document has been revised and polished by professional agencies.
Reviewer 2 Report
The manuscript is of interest. The reviewer has minor suggestion before publishing:
* Comprehensive spell checking of the English
* Improve the captions of figures, espoecially for fig.5 (a), (b) and (c)
Author Response
The manuscript is of interest. The reviewer has minor suggestion before publishing:
Point 1 : Comprehensive spell checking of the English
Response 1：The spelling and grammar corrections of the document has been revised and polished by professional agencies.
Point 2 : Improve the captions of figures, especially for fig.5 (a), (b) and (c)
Response 2：The captions of figures have been improved.
Reviewer 3 Report
The present manuscript is referred to a debonding failure model development which describes the debonding failure between the polyurea-coating and flood discharge building under the action of high-velocity water flow and its application.
It is an interesting manuscript and I consider that it should be accepted after minor revision, according to the following suggestions:
1) The standard of the language may well be enhanced as some structural points are partially incomprehensible.
2) Figure 9 on page 13 should be corrected as follows: The labels numbered (3) and (4) should be replaced by (c) and (d) accordingly.
3) Checks concerning the word space should be revised.
4) Corrections should be made concerning the reference list.
Author Response
The present manuscript is referred to a debonding failure model development which describes the debonding failure between the polyurea-coating and flood discharge building under the action of high-velocity water flow and its application.
It is an interesting manuscript and I consider that it should be accepted after minor revision, according to the following suggestions:
Point 1 : The standard of the language may well be enhanced as some structural points are partially incomprehensible.
Response 1：The spelling and grammar corrections of the document has been revised and polished by professional agencies.
Point 2 : Figure 9 on page 13 should be corrected as follows: The labels numbered (3) and (4) should be replaced by (c) and (d) accordingly.
Response 2：The problem has been corrected in the text.
Point 3 : Checks concerning the word space should be revised.
Response 3：The problem has been checked and revised in the text.
Point 4 : Corrections should be made concerning the reference list.
Response 4：The problem has been corrected in the text.
Reviewer 4 Report
Pg 2, Paragraph 2, 1st sentence - "Polyurea-based is an elastomer...", should be "Polyurea-based material is an elastomer...".
Please provide more details for the constitutive model of the concrete used in the study.
Similarly for the bonding material (adhesion layer) shown in Figure 4.
Considering that the phenomenon such as high-velocity water flow and impact force will induce strain rate effects in the polyurea material, the authors need to specify if the strain rate effects of the polyurea material were included in the constitutive model? If they were not included, please provide justification.
Further to comment No. 4, the authors are recommended to cite the following articles on the rate effects of the polyurea material:
Raman, S. N., Ngo, T. Lu, J. and Mendis. P. (2013). Experimental investigation on the tensile behaviour of polyurea at high strain rates. Materials and Design. 50: 124-129.
Mohotti, D., Ali, M., Ngo, T., Lu, J., & Mendis, P. (2014). Strain rate dependent constitutive model for predicting the material behaviour of polyurea under high strain rate tensile loading. Materials and Design. 53: 830-837.
How was the damage mechanism of the concrete incorporated into the FE model? Which failure criterion were judged as the governing mechanism and why?
Were the failure strain of the polyurea material considered in the modelling exercise?
Please correct the typographical error in Figure 18's caption.
The paper needs to be proofread by a native speaker to enhance the presentation quality and clarity of the paper.
Author Response
Point 1 : Pg 2, Paragraph 2, 1st sentence - "Polyurea-based is an elastomer...", should be "Polyurea-based material is an elastomer...".
Response 1：The problem has been corrected in the text.
Point 2 : Please provide more details for the constitutive model of the concrete used in the study.
Response 2： It is assumed that the deformation of concrete is in the elastic deformation stage during the process of peeling damage of polyurea-based coating and concrete in this paper. The linear elastic constitutive model was adopted, and the elastic modulus and Poisson's ratio in the model are 32.5 GPa and 0.2, respectively. Because the linear elastic constitutive model is widely used, the details for the constitutive model of the concrete are not introduced.
Point 3 : Similarly for the bonding material (adhesion layer) shown in Figure 4.
Response 3：There is no cohesive layer in the finite element model, and the mechanical behavior of the interface is described by the cohesive zone model. The constitutive relationship of the cohesive element follows the traction-separation law. The second stress criterion and the B-K criterion are selected as the damage initiation criterion and the damage evolution criterion of cohesive element. These are presented in section 2.3.
Point 4 : Considering that the phenomenon such as high-velocity water flow and impact force will induce strain rate effects in the polyurea material, the authors need to specify if the strain rate effects of the polyurea material were included in the constitutive model? If they were not included, please provide justification.
Further to comment No. 4, the authors are recommended to cite the following articles on the rate effects of the polyurea material:
Raman, S. N., Ngo, T. Lu, J. and Mendis. P. (2013). Experimental investigation on the tensile behaviour of polyurea at high strain rates. Materials and Design. 50: 124-129.
Mohotti, D., Ali, M., Ngo, T., Lu, J., & Mendis, P. (2014). Strain rate dependent constitutive model for predicting the material behaviour of polyurea under high strain rate tensile loading. Materials and Design. 53: 830-837.
Response 4：The strain rate effects of the polyurea material are not included in the constitutive model. The focus of this paper is the debonding failure of polyurea-based coatings and concrete interfaces under a high-velocity water flow. The properties of polyurea-based materials were not studied, and their behavior was described by the elastic model. Thank you for your references, which provide ideas for my study, and they have been cited in the paper.
Point 5 : How was the damage mechanism of the concrete incorporated into the FE model? Which failure criterion were judged as the governing mechanism and why?
Response 5：Because the strength of concrete is much greater than the strength of the bonding layer, the concrete was not damaged during the debonding failure process. Moreover, the deformation of concrete was basically in the elastic deformation stage. Hence, the elastic model was adopted to describe the behavior of concrete, and damage to the concrete is not considered in the FE model.
Point 6 : Were the failure strain of the polyurea material considered in the modelling exercise?
Response 6：The focus of this paper is on the debonding failure of polyurea-based coatings and concrete interfaces under a high-velocity water flow. The failure strain of the polyurea-based material was not considered, and a constitutive relationship of polyurea-based materials is described by the elastic model. The properties and models of polyurea-based materials will be studied in future research.
Point 7 : Please correct the typographical error in Figure 18's caption.
Response 7：The problem has been corrected in the text.
Point 8 : The paper needs to be proofread by a native speaker to enhance the presentation Point uality and clarity of the paper.
Response 8：The spelling and grammar corrections of the document has been revised and polished by professional agencies.
Round 2
Reviewer 1 Report
The authors dd a commendable effort in revising the document.
