...Sanlong Zheng; Yiqi Zhang; Jiawei Xu; Bingbing Chen; Pengfei Wang; Yang Liu The knockdown factor (KDF), which characterizes the difference between the actual buckling pressure and the classical theoretical pressure of clamped spherical caps under external pressure, is highly discrete. The mechanism...

...Licai Yang; Yuguang Li; Tian Qiu; Yuanyuan Dong; Shanglin Zhang This paper proposes an analytical buckling load formula for a cylindrical shell subjected to local axial compression for the first time, which is achieved by a carefully constructed load description and perturbation procedure. Local...

.... Then we compare elastic–plastic behaviors between ellipsoidal and equivalent torispherical heads as well as their failure modes, i.e., buckling and plastic collapse (bursting). It is found that ellipsoidal heads have more buckling resistance than equivalent torispherical heads, indicating that the current...

...Yongmei Zhu; Bo Zhao; Binbin Chen; Xilu Zhao; Wenxian Tang; Xiaorong Wang The buckling characteristics of toroidal shells with closed circular cross sections loaded with a static external pressure were investigated. Eight toroidal shell test models were developed: two ribless, two semicircular...

...Ivo Senjanović; Neven Alujević; Ivan Ćatipović; Damjan Čakmak; Nikola Vladimir; Dae-Seung Cho The energy approach is used to analyze the buckling stability of toroidal shells. A closed and an open toroidal shell, as well as a shell segment are considered. Linear strain energy and nonlinear strain...

... and base. However, during seismic events, the hydrodynamic load originating from the seismic acceleration of liquid in the tank starts to act in the direction of the earthquake motion. This leads to a nonaxisymmetric loading distribution, which may result in buckling and uplifting of the tank structure...

... bifurcation analysis and a post-buckling analysis were then conducted to verify the tank's stability when subjected to wind loading in accordance with the wind profiles specified in the selected design documents. To ensure the quality of the analyses, a study on mesh convergence and the load increment of Riks...

...E. Azzuni; S. Guzey Thin elastic circular rings under uniform pressure have been extensively studied by many researchers. Both the deflection and buckling behavior of rings were considered in these studies, but most have focused on the small deformations analysis approach. Even though the use...

... until they buckled/collapsed. They were subsequently internally pressurized until burst. The details about the numerical process, which simulates the two-stage loading process, i.e., starting with buckling by external pressure being followed by reloading using internal pressure for up to the burst...

...Guowei Cao; Zhiping Chen; Licai Yang; Haigui Fan; Fan Zhou where N q = qL / R . (1) The buckling loads of the cylindrical shells decrease with the increase of the thickness imperfection parameter ɛ and thickness attenuation wavelength parameter a . (2...

...J. Błachut In many real life situations one needs to connect several cylindrical segments to form a prime load bearing structure. When loading is an axial compression—the interaction between two neighboring cylindrical segments becomes critical. Possibility of buckling of either one or both...

... round shape. settlement buckling API tank elastic foundation finite element A 3D shell element model was created using COSMOS 2.9 with 4-node thin shell element for the shell, wind girder and the supported cone roof while a 3D beam element was used for the girder and rafter...

... kind of imperfection to the model, which is a priori perfectly symmetric, in order to locate the buckling lobe [ 14 ]. Thus, a uniform 0.60 mm annular gap amplitude (relative g / R  = 0.00015) and a 0.10 mm maximum ovality (out of roundness 0.025‰ of radius) at the top of the cylinder are considered...

... of cone CS2 prior to testing Fig. 10 Photographs of failed cones Table 5 Comparison of experimental failure loads with computed values. Note: Number of circumferential waves at buckling is in round brackets Material model A Material model B ABAQUS –S8R BOSOR5...

.... Relationships among the different variables are determined. Finally, the results are checked with respect to several buckling modes to consider elastic instability conditions. Buried pipelines could experience significant longitudinal deformations due to mainly temperature rise (because of the effect...

... to use FGM layers to reduce shear and normal stress gradients at the interfaces. Furthermore, the FGM layers lead to benefits as far as buckling load is concerned; lower values of in-plane shear and longitudinal compressive stresses are, in fact, obtained with respect to a pure two-layered wall...

... was conducted using the finite element methods to evaluate the effects of welding residual stress due to girth welding processes, joint-to-joint misalignment associated with the girth weld, internal pressure, axial force, and diameter to wall thickness ratio on the local buckling response of pipelines...

...Zhi-Min Li; Zhong-Qin Lin; Guan-Long Chen A boundary layer theory for buckling and postbuckling of anisotropic laminated thin shells is extended to shear deformable stiffened anisotropic laminated shells. A postbuckling behavior is investigated for a shear deformable anisotropic laminated...

...Eelke S. Focke; Arnold M. Gresnigt; Annemiek Hilberink A promising possibility to reduce costs in pipelines that require corrosion resistant alloys (CRAs) is the use of lined pipe, consisting of a carbon steel outer pipe and a CRA liner pipe. Research has been carried out into the local buckling...

... nature of the postcollapse evolution, interaction with buckling is likely to be significant enough to demand consideration. At the present, few studies have been carried out both experimentally and numerically, as witnessed by the really conservative attitude that codes assume for thick tubes...