Experimental research of the stress-strain state of prestressed cylindrical shells taking into account temperature effects

Finite-Element Modeling of the Dynamic Behavior of a Crack-like Defect in an Internally Pressurized Thin-Walled Steel Cylinder

“…In the future, it will give ideas about the mechanics of crack propagation formed on the surface of manistral gas pipelines. As a result, this will provide an initial understanding for the further application of the prestressing method for the localization of longitudinal propagation in gas pipelines, previously substantiated in the published works of the authors [59][60][61][62][63][64]. Indeed, there is a need to study the issue of steel gas pipeline failures with further development of a method for their prevention, which is very actual at the national scale, as today the wear of gas pipelines in the Republic of Kazakhstan is more than 70% [65].…”

“…A cylindrical shell finite-element model was initially created (Figures 1, 3 and 4), and a step-by-step modeling technique was developed by the software package (Figure 2). Furthermore, the mechanical parameters of the steel material of the full-scale gas pipeline were determined [59], in which a qualitative finite-element model was similarly created (Figures 1, 3 and 4), and a stepwise methodology of modeling within the The aforementioned work presented one part of the authors' research. On the basis of finite-element simulations performed by ANSYS-19.2 [68], the study of the fracture of steel gas pipelines under the influence of internal pressure on the propagation of an incipient crack in their tip area was implemented on the existing gas pipeline "Beineu-Bozoy-Shymkent" [59].…”

“…Furthermore, the mechanical parameters of the steel material of the full-scale gas pipeline were determined [59], in which a qualitative finite-element model was similarly created (Figures 1, 3 and 4), and a stepwise methodology of modeling within the The aforementioned work presented one part of the authors' research. On the basis of finite-element simulations performed by ANSYS-19.2 [68], the study of the fracture of steel gas pipelines under the influence of internal pressure on the propagation of an incipient crack in their tip area was implemented on the existing gas pipeline "Beineu-Bozoy-Shymkent" [59]. A cylindrical shell finite-element model was initially created (Figures 1, 3 and 4), and a step-by-step modeling technique was developed by the software package (Figure 2).…”

“…In this case, the supports did not influence the process of crack development. The geometrical parameters of the pipeline were those of the natural gas pipeline "Beineu-Bozoy-Shymkent" in the Republic of Kazakhstan, including its underground and aboveground parts [59]. The pipe diameter was dтp = 1047 mm, while the thickness of the pipe wall was hтp = 15.9 mm.…”

“…The use of this model allowed us to consider the dependence of the mechanical characteristics of the X70 steel on the strain rate. The state equation for the CSS-plastic state of the material takes the form: 𝜎 𝐴 𝐵 𝜀 1 𝐷 𝜕𝜀 /𝜕𝑡 / , where 𝐴 is the yield stress at zero plastic strain; 𝐵 is the strain hardening coefficient; 𝜀 is the plastic strain; n is the strain hardening exponent; 𝜕𝜀 /𝜕𝑡 is the plastic strain rate; whilst D, q are the strain rate The geometrical parameters of the pipeline were those of the natural gas pipeline "Beineu-Bozoy-Shymkent" in the Republic of Kazakhstan, including its underground and aboveground parts [59]. The pipe diameter was d Tp = 1047 mm, while the thickness of the pipe wall was h Tp = 15.9 mm.…”