Nonlinear buckling analysis of a semi-elliptical dome: Numerical and experimental investigations

Barathan, Venugopal; Rajamohan, Vasudevan

doi:10.1016/j.tws.2021.108708

Cited by 13 publications

(4 citation statements)

References 42 publications

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“…Figure 7 shows the Eigen affine geometric imperfection adopted by Barathan and Rajamohan [17]. To implement this, modal analysis of the specimen is performed first.…”

Section: Geometric Imperfectionmentioning

confidence: 99%

“…An illustration of eigen affine imperfection is already explained in the section 'geometric imperfection'. From the figure 13, it was observed that the first mode has only one peak at its apex, the second mode shape consists of peak and valley and the third mode shape also has one peak and valley [17,22,23]. Initially, the nonlinear buckling analysis has been performed by considering the first mode alone with 0.1 imperfection amplitude (Case 1) and the combination of first three modes with 0.1 imperfection amplitude (Case 2).…”

Section: Effect Of Imperfection On a Semi-ellipsoidal Shellmentioning

confidence: 99%

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Augmenting Material Characterisation via Numerical Analysis to Improve Robustness in Mechanical Property Evaluation

Mishra,

Venugopal,

Mathew

2024

AMM

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Experimental evaluation of mechanical properties of materials is often standardised by pre-defining the test specimen in terms of its geometrical features and random errors if any need to be screened out during experimentation. However, eliminating the systematic biases is a formidable task. This study presents the efforts taken to address three important systematic biases possible in the case of mechanical property evaluation of materials. For a simple tensile strength characterization, misalignment of the specimen with respect to the axis of loading, turning effect in the load application system and geometrical imperfection are considered in the test specimen. These concepts are illustrated using numerical analysis for SAE 1045 steel material. Sheet specimens as per the ASTM standards are modelled and the stress-strain behaviour of the material is bench marked with experimental results. Subsequently, pre-defined cases of (a) specimen misalignment, (b) twisting and (c) geometric imperfections are introduced to study the variations in stress-strain behaviour. It is observed that an inadvertent twisting force coupled with an axial load increases the Von-Mises stress at the mid-section of the specimen increased by about 33% and reduces its fatigue life by 96%. The study clearly brings out the implications of such inadvertent systematic biases occurring in a typical experimental or usage scenario on the component life. It also shows how the numerical computations can offer a robust methodology to assess the bounds of possible deviations.

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“…Figure 7 shows the Eigen affine geometric imperfection adopted by Barathan and Rajamohan [17]. To implement this, modal analysis of the specimen is performed first.…”

Section: Geometric Imperfectionmentioning

confidence: 99%

Section: Effect Of Imperfection On a Semi-ellipsoidal Shellmentioning

confidence: 99%

Augmenting Material Characterisation via Numerical Analysis to Improve Robustness in Mechanical Property Evaluation

Mishra,

Venugopal,

Mathew

2024

AMM

View full text Add to dashboard Cite

show abstract

“…This stress stiffness matrix is calculated in the static structural tool by applying the unit pressure with above mentioned boundary conditions. The stress stiffness matrix of the structure is transferred to eigen buckling analysis tool to evaluate the critical buckling pressure and corresponding mode shapes [35]. The first eight eigenvalue modes are output (see Figure 6), and the results of the first eight eigenvalue buckling are shown in Table 3.…”

Section: Finite-element Analysis Of Linear Bucklingmentioning

confidence: 99%

Optimized Design of the Carrier Structure of an Autonomous Glide Marine Seismometer

Li,

Zhu,

Qin

et al. 2023

JMSE

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Mobile Earthquake Recording in Marine Areas by Independent Divers (MERMAID) provides a possibility for long-term and large-scale observation of natural seismic P waves, but it does not have mobility and can only drift with ocean currents, resulting in observation equipment locations that are too sparse or too dense, both of which are not suitable for network observation. Therefore, this paper developed a new type of Autonomous Glide Marine Seismometer (AGMS) with mobility and the ability to adjust the observation position. The AGMS adopts a flying saucer shape, which has better hydrodynamic characteristics and better motion stability. This paper focused on the material, shape, and structure of the pressure-resistant shell for the selection of design and strength checking research. Using the finite element analysis method and introducing the initial defect, the results showed that the yield strength of the pressure-resistant shell decreases with the initial defect value. The calculation results were compared and analyzed with the relevant theoretical formulas and specification calculation results, and all the results met the design requirements. The results of this design could also provide reference for the design of related deep-sea pressure chambers.

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“…Numerical simulation is applicable to the buckling analysis of complex steel structures composed of huge numbers of members. Currently, the study of buckling through finite element method has been widely used in thin-walled shells, 13 thick plates, 14 circular tubes, 15 columns 16,17 and frame structure. 18 It is very expensive to study the buckling failure test of giant crane, and several experiments are needed for different working conditions.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear buckling analysis of tower crane structure based on movable boundaries

Qin

Gao

et al. 2022

Advances in Mechanical Engineering

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The tower crane is a typical soaring and complex frame structure, and buckling is an important factor affecting its safety and carrying capacity. Considering the special characteristics of the boundary conditions for the boom structure, a numerical analysis method based on movable boundaries is proposed in this paper. In order to demonstrate the accuracy of the method, numerical analysis and stress tests are carried out on the tower crane. The results show that the numerical results are basically consistent with the experimental results. A geometric buckling analysis for extremely severe conditions is carried out in order to understand the buckling behaviors. The failure modes and complete load-response curves obtained for the tower crane are comprehensively analyzed. A dual (geometric and material) nonlinear buckling analysis of the tower crane is then investigated. Finally, the influences of the deflection load parameters on the buckling response of the tower crane are explored. It is demonstrated that bifurcation point buckling and limiting point buckling are excited by different deflection load parameters, respectively. The proposed method can accurately predict the buckling of the tower cranes, given the coupling of structure and mechanism, to ensure the safety of giant cranes in actual engineering use.

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Nonlinear buckling analysis of a semi-elliptical dome: Numerical and experimental investigations

Cited by 13 publications

References 42 publications

Augmenting Material Characterisation via Numerical Analysis to Improve Robustness in Mechanical Property Evaluation

Augmenting Material Characterisation via Numerical Analysis to Improve Robustness in Mechanical Property Evaluation

Optimized Design of the Carrier Structure of an Autonomous Glide Marine Seismometer

Nonlinear buckling analysis of tower crane structure based on movable boundaries

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