We propose to solve the buckling problem for metal rings subjected to compression loading when externally enclosed in a rigid medium as a contact problem of deformation of a composite solid with a unilateral constraint. This method is based on manufacturing deviations characteristic of real structures; general state of stress; real-time operation. With this approach, the method makes it possible to determine the moment of local buckling of the ring visually and quantitatively from the changes in the stress-strain state of the ring. We implemented our method in the LS-DYNA software package in the dynamic formulation using solid finite elements. The geometrically and physically non-linear computation problem statement allows for taking large displacements and plastic strains into account. External compression loading of the ring is stated by its heating inside a rigid enclosing medium (the case), which is considered thermally insulated. We do not solve the heat conduction problem. We computed buckling parameters of a thin steel ring for two manufacturing deviation types relating to local variations of ring and case thicknesses at different lengths. We show how these two types lead to differences at the initial ring deformation stage and subsequent loop formation ("inward lobe"). We present strain field images for the ring and the case, which made it possible to visually detect the ring buckling moment. We plotted the stress, strain and displacement curves in the local delamination area. These curves enabled us to quantitatively detect the ring buckling moment. Qualitative and quantitative estimates of ring buckling matched.
Оценка допустимого давления опрессовки металлического лейнера…Инженерный журнал: наука и инновации # 2·2019 3 Оценка допустимого давления опрессовки металлического лейнера…Инженерный журнал: наука и инновации # 2·2019 9 Егоров АнтонWe investigated a liner local buckling as a result of delamination, which can occur at various stages of production, including the cases when the composite tape is wound with tension on the liner. To solve the problem of estimating the allowable pressure of the liner pressure test, a method of two calculations is proposed, the technique is focused on the use of temperature analogy. The method implements the closure of solutions to the contact pressure and stability of the liner through a common parameter which is the hoop stress in the liner in stressed state zone, this state is close to homogeneous. The contact pressure of the multi-ply composite shell on the liner is determined by the value of the specified tension of the composite tape wound. The liner stability calculation was carried out in the LS-DYNA software package in a dynamic formulation when specifying the cooling of the outer shell. Delamination computing for the middle part of a cylindrical metal composite high-pressure vessel was performed. We show both variants: (i) with the liner peeling from the composite shell and (ii) without delamination.
PurposeThe purpose of this paper is to expand possibilities of stability computing method when performing a dynamic analysis of bar- or rod-shaped elements for actual structures.Design/methodology/approachThe methodology is based on the changes of stress–strain state of the bar-shaped elements at the moment of buckling. The proposed method is based on three assumptions. Firstly, the spatial stress–strain state is determined in the bar. Secondly, technological deviations inherent in real structures are introduced into the bar. Thirdly, mechanical behaviour of the bar is investigated in the mode of real time, which makes it possible to take into account wave deformation processes in the bar. To implement the suggested method of analysis, LS-DYNA package was selected in a dynamic formulation using solid finite elements.FindingsValidity of the proposed method is shown by an example of dynamic stability analysis of a steel flat thin bar with two types of loads: short-time and long-term axial compressions. Comparison of the results showed different nature of the mechanical behaviour of the bar: wave processes are observed under short-time loading, and continuous monotone ones are stated under long-term loads.Practical implicationsResearch results are applicable in the rocket and space industry.Originality/valueA new computer-based methodology for dynamic analysis of heterogeneous elastic-plastic bar-, rod-shaped structures under shock axial compressive loads is proposed.
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