Parametric Instability of Functionally Graded Porous Cylindrical Panels under the Effect of Static and Time-Dependent Axial Loads

Round 1

Reviewer 1 Report

The topic of the present paper is interesting, however, it needs some major modifications such as

1. The abstract needs enhancement and modification to highlight the novelty of the article and remove any general sentences. For example 

   a) Studying the instability of cylindrical panels containing functionally graded porous and exposed to the static and dynamic periodic axial loads is very important because it's used in many applications. (general sentence, remove or adopt)

   b) two points of conclusions and outcomes can be added to abstract. 

   c) novelty of the article can be highlighted. 

2. In introduction section

a) "The presence of porosity in the structure makes its stiffness-to-weight as compared to homogeneous isotropic materials ratio very good". (prove or add reference).  All general sentences should be cited by references. 

 b) the introduction section can be improved as following

     one paragraph for importance and applications of cylindrical panels. One paragraph for theories and solution techniques. one paragraph for porous materials, applications, and analysis.  One paragraph for novelty and paper organization.  

c) the following articles can be cited. 

i. (2020). Nonlinear static and dynamic hygrothermal buckling analysis of imperfect functionally graded porous cylindrical shells. Applied Mathematical Modelling, 77, 539-553. 

ii. (2020). Influence of axial load function and optimization on static stability of sandwich functionally graded beams with porous core. Engineering with Computers, 36(4), 1929-1946.

iii. (2020). Nonlinear vibration behavior of functionally graded porous cylindrical panels. Composite Structures, 239, 112028.

iv. (2020). Natural frequency and dynamic analyses of functionally graded saturated porous annular sector plate and cylindrical panel based on 3D elasticity. Aerospace Science and Technology, 96, 105524.

v. (2022). Free Vibration of FG-CNTRCs Nano-Plates/Shells with Temperature-Dependent Properties. Mathematics, 10(4), 583.

vi. (2022). A Dynamic Analysis of Randomly Oriented Functionally Graded Carbon Nanotubes/Fiber-Reinforced Composite Laminated Shells with Different Geometries. Mathematics, 10(3), 408.

3. In section 2. theoretical approach

a) Figure 2 should be cited and represented in high resolution. 

b) the font of equations can be adopted to journal template. 

In section 3. Numerical results 

a) you wrote "The results reliability is good between the present result and the result of [14] as shown in Table 1" . By checking the results, you will find that, there is an error within 10%. Please verify

4. Conclusion section can be reduced and condensed. 

5. The references can be checked and adopted according to template. for example Ref. 25. 

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

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Comments for author File: Comments.pdf

Author Response

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Round 2

Reviewer 1 Report

The paper can be accepted in the current form

Reviewer 2 Report

The Authors have correctly made all the required changes.