Research on Buckling Load of Cylindrical Shell with an Inclined through Crack under External Pressure and Its Solution
Round 1
Reviewer 1 Report
1. The abstract needs to be written more carefully. The background and purpose, the analysis method, and the conclusion should be more specific and clear.
2. α showed in equation (1) and Figure 2 can be confused.
It would be nice to denote one of them with a different symbol.
3. Please edit below to make it a complete sentence.
1) lines 135~136
The elastic modulus E=113161.41MPa, Poisson's ratio ν=0.348, yield stress σ0=418MPa，n=6.69，α=1.05.
2) lines 183~184
Crack length c (α= 30°); Crack inclination θ= 0°,15°,30°,45°,60°,75°,90°. L/R= 4,12,20,28,36.
3) lines 203~204
Crack length c (α= 30°); Crack inclination θ= 0°,15°,30°,45°,60°,75°,90°. R/T= 5,10,15,20,25.
4) lines 219~220
Crack inclination θ=0°,15°,30°,45°,60°,75°,90°.Crack length c (α=30°,60°,90°,120°,150°,180°).
5) lines 237~238
Crack inclination θ=0°,15°,30°,45°,60°,75°,90°.Crack length c (α=30°,60°,90°,120°,150°,180°).
6) lines 320 ~321
Crack inclination θ= 0°,15°,30°,45°,60°,75°,90°. Crack length c (α=30°,60°,90°,120°,150°,180°).
7) lines 386~389
For cracked cylindrical shell with simple support at both ends of cylinder, L/R=5,10,15,20,25, c(α=30°,60°,90°,120°,150°,180°), θ=0°,15°,30°,45°,60°,75°,90°. For cracked cylindrical shell with clamped support at both ends of cylinder, L/R=20,R/T=25, c(α=30°,60°,90°,120°,150°,180°), θ=0°,15°,30°,45°,60°,75°,90°.
4. lines 442~443
The fitting results for cracked cylindrical shell with clamped support are shown in Table.7
→ The fitting results for cracked cylindrical shell with clamped support are shown in Table 7.
5. Express the titles of the vertical axis and the horizontal axis of Figures 6~13 in full names including symbols.
6. lines 214~216
From “The results show that when the crack inclination angle increases, the elastic buckling load of the cracked cylindrical shell is more sensitive with the increase of radius-thickness ratio.”
→ The meaning of ‘more sensitive’ should be specifically explained.
7. It would be better if the size and font size of the graphs in the manuscript were drawn a little larger to make it easier to recognize.
8. lines 242~244
From “It can be seen from Figure 9 that the elastic buckling load decreases gradually with the increase of crack length or crack inclination angle, and the drop degree of elastic buckling load becomes more significant with crack length and crack inclination angle.”
→ In what case is 'crack length and crack inclination angle'? Should be specific explained.
9. lines 281~285
From “Compared with the elastic buckling load value (Figure 7 (b)), there is little difference in the buckling load results between the elastic-plastic buckling analysis and the elastic buckling analysis when the radius-thickness ratio is larger (R/T ≥ 25, namely thin cylindrical shell) where the elastic buckling load is 2.2387MPa, and elastic-plastic load is 2.21976MPa when θ = 0 °.”
→ Here, the results for the case of R/T > 25 are not shown.
10. Wouldn't it be correct to express the displacement of the transverse axis in Figure 15 as the displacement in the radial direction?
11. In the graphs of Figures 15 and 16, the shape of the deformed cylindrical shell is small and the resolution is low, making it difficult to check.
Likewise, it is necessary to increase the font size of the axis title and scale in Figures 17~20.
12. In equation (2), the definitions of ‘a’ and ‘T’ are missing.
13. Represent the equation used in the notes of Tables 4, 5, 6 and 7 clearly.
14. Although the results are well expressed in this manuscript, it seems that the discussion corresponding to the results derived is somewhat lacking. It would be better if it is supplemented.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Report on manuscript metals-2138406
Title: “Research on buckling load of cylindrical shell with an inclined through crack under external pressure and its solution”
By Shou-Chao Li et al.
In the manuscript, the authors report on results of theoretical studies of the finite element models of cylindrical shell with an inclination through crack under external pressure. The authors study in detail the influence of crack length (c), crack angle(θ), cylindrical shell length-radius ratio (L/R), radius-thickness ratio (R/T), boundary conditions on buckling load. The results presented here may be of interest for potential readers of the journal “Metals”. However, some revision should be made as reported just below:
1) The authors should clearly indicate the novelty of the present study. I mean, what is the main achievement of the present manuscript in comparison with the models elaborated earlier in Refs. [21-24] as well as in some earlier publications cited in the manuscript.
2) Page 3, Line 131: The authors report: “The material is commercial pure titanium TA2,”. The choice of this materials should be motivated.
3) Page 3, lines 135-136. What references the tata “The elastic modulus E=113161.41MPa, Poisson's ratio ν=0.348, yield stress σ0=418MPa， n=6.69， α=1.05” are taken from?
4) Page 5: “The unit pressure 1.0MPa is applied on the outer surface of cylindrical shell.” The choice of pressure to be equal to 1.0 MPa should be explained in the text. This also concerns the parameters of finite element models “The basic parameters of finite element models are R=500mm, L=10000mm, T=20mm.” (line 218, page 8).
5) Are there any experimental evidences for application of the theoretical buckling modes presented in Figs 4 and 5, i.e. for some other materials?
6) The term “Simple support” should be explained in the text.
7) The authors deal with Ramberg-Osgood model [15] in their studies. What’s about other models that could be effectively used for explanation of the tasks of the present study?
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
Corrections were good made according to the comments of the reviewers.
There are a few final corrections below.
(1) 4.5. Displacement load curve under elastic-plastic buckling
→ 4.5. Load-displacement curve under elastic-plastic buckling
(2) The titles of the horizontal axes in Figures 14, 15 and 16 have not been changed yet.
Displacement (mm) → Radial displacement (mm)
(3) In Figure 17~20, it would be look better if the direction of ‘P c r/P t’ was rotated by 180° and displayed.
(4) Express the titles of ‘P c r/P t’ of Figures 17~20 in full names including symbols.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
