Development and Evaluation of Crack Band Model Implemented Progressive Failure Analysis Method for Notched Composite Laminate

Round 1

Reviewer 1 Report

The word size of figure 3-18 including horizontal and vertical axis should be bigger and clear. Have you fracture photos after tensile and compressive test ? It should links PFA results

Author Response

Thank you for your valuable review.

 

The word size of figure 3-18 including horizontal and vertical axis should be bigger and clear. We adjusted the sizes of figures including the horizontal and vertical axes.

 

Have you fracture photos after tensile and compressive test ? It should links PFA results Following your review, we modified Figure 20 to include the magnified side view of the fractured specimens. The side views exhibit fiber breakage and shear failure for the tensile and compressive specimens, respectively. Figure 20 can be used to link the PFA results to the experimental results. We added the relevant sentences in Section 4.4 to explain the changes to Figure 20.

“The side view for the tensile specimen exhibits catastrophic fracture, as evidenced by the fiber breakage shown in Figure 20 (a). However, as shown in Figure 20 (b), the compressive test specimen was mainly fractured in the shear failure mode [25, 34, 35], and the fibers were not completely broken.”

Reviewer 2 Report

This paper describes that a PFA model developed using the Hashin failure criterion and crack band model provides the numerical results which are in good agreement with the experimental ones of open-hole composite laminate tests. The paper contains interesting points and is an important contribution. I think the paper could potentially be suitable for publication in the journal.

Author Response

Thank you for your review and positive opinion.

Reviewer 3 Report

Review of “Development and Evaluation of Crack Band Model Implemented Progressive Failure Analysis Method for Notched Composite Laminate” by Yoon et al.
The authors have presented a finite element based numerical model for failure analysis of a composite material. The numerical results are compared with experimental tests. The study is interesting and should be published after my following comments are addressed.

1. The authors have mentioned that composite materials comprising cavities in epoxy are used in the automotive industry. These composites are also commonly used in a number of other industries. For example, see the references below. I suggest the authors to expand the introduction and include a summary of applications of composites comprising cavities in different fields to reach a wider audience.
[1] Skvortsov et al., Sound scattering by a lattice of resonant inclusions in a soft medium, Physical Review E, 99(6), 063006, 2019

2. The authors have demonstrated that their model works for epoxy with cavities. Can the authors comment if the method is also applicable for epoxy embedded with hard inclusions? See the reference below for application of such materials.
[1] Sharma et al., Acoustic performance of periodic steel cylinders embedded in a viscoelastic medium, Journal of Sound and Vibration, 443, 652-665, 2019.

3. What is the rationale behind “fracture energy of the composite material was considered when using the damaged variable by applying the crack-band-model”?

4. The size of the text in the axes labels of Fig. 7 onwards is too small to read in a printed version. I suggest the authors to increase the size of the texts and numbers so that it is approximately the same size as the text in the figure caption.

Author Response

Thank you for your valuable review.

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 3 Report

The authors have revised the manuscript and incorporated most of my comments on the original manuscript. I would suggest the authors to also include a discussion based on the "Point 2" re hard inclusions. Perhaps they can include a separate section to briefly discuss the different scopes of future work and how their work can be extended for the same. Along with other appropriate composite materials, the authors may discuss the case when there are both rigid inclusions and cavities in a host material. For example, see the reference below for the application of such materials.

Sharma et al., Sound absorption by rubber coatings with periodic voids and hard inclusions, Applied Acoustics, 143, 200-210, 2019. 

 

Author Response

Thank you for your valuable review. We agree with your opinion. Accordingly, we have added material to Section 5 (Conclusions). Considering your review, we added following paragraph to expand the conclusions to reach a wider audience.

 

"In addition, it is considered that such advantages may be useful in predicting the structural health in the field of sound absorption that uses the geometrical discontinuities as a design factor (e.g. rigid inclusions and cavities in a host material [1, 36-38])."

 

Some references were added. [36-38]

36. Sharma, G. S.; Skvortsov, A.; MacGillivray, I.; Kessissoglou, N. Sound absorption by rubber coatings with periodic voids and hard inclusions. Appl. Acoust. 2019, 143, 200-210. [doi.org/10.1016/j.apacoust.2018.09.003]

37. Sharma, G. S.; Skvortsov, A.; MacGillivray, I.; Kessissoglou, N. Sound transmission through a periodically voided soft elastic medium submerged in water. Wave Motion. 2017, 70, 101-112. [doi.org /10.1016/j.wavemoti.2016.10.006]

38. Sharma, G. S.; Skvortsov, A.; MacGillivray, I.; Kessissoglou, N. Acoustic performance of periodic steel cylinders embedded in a viscoelastic medium. J. Sound. Vib. 2019, 443, 652-665. [doi.org /10.1016/j.jsv.2018.12.013]

Author Response File: Author Response.pdf