Elastic-Plastic Buckling Analysis of Spherical Latticed Shell of Large Scale Molten Salt Storage Tank

2019 ◽  
Author(s):  
Hui Tang ◽  
Qianyu Shi ◽  
Zhijian Wang ◽  
Qi Li
Keyword(s):  
Molten Salt ◽  
Storage Tank ◽  
Large Scale ◽  
Rapid Development ◽  
Thermal Power ◽  
Element Model ◽  
Buckling Analysis ◽  
Deformation Method ◽  
Plastic Buckling ◽  
Elastic Plastic

Abstract In recent years, with the rapid development of solar thermal power technology in China, the key equipment molten salt storage tank is widely used. Instability is the primary failure mode for these large thin-walled structures. Thus, stability design for the molten salt storage tanks is significant. In this paper, the elastic and elastic-plastic buckling analyses of a spherical latticed shell are carried out with whole process load-deformation method considering geometric and material non-linearity. The critical buckling loads of these two analysis types are obtained from the load-deformation curve. Comparison between spherical latticed shells with channel beam and I-section beam is presented. The modeling method of finite element model for buckling analysis of latticed shell is discussed. This may provide a reference to the stability design of large scale storage tank.

The Effect of Hydrostatic Pressure and Thermal Load on Buckling Analysis of Large Scale Tank Roof

2020 ◽  
Author(s):  
Qianyu Shi ◽  
Zhijian Wang ◽  
Hui Tang ◽  
Qi Li
Keyword(s):  
High Temperature ◽  
Hydrostatic Pressure ◽  
Power Systems ◽  
Molten Salt ◽  
Large Scale ◽  
Thermal Power ◽  
Buckling Analysis ◽  
Storage Tanks ◽  
Nonlinear Buckling ◽  
Nonlinear Buckling Analysis

Abstract Large scale molten salt storage tanks are widely used in the solar thermal power systems. For these tanks, buckling is a primary failure mode because of its features such as large scale, thinned wall and high temperature. Suffering high temperature condition is a major distinction between molten salt storage tanks and other water or oil tanks. High temperature can cause large thermal deformation for large scale structures which may have an effect on the safety assessment, especially on buckling assessment. Meanwhile, the hydrostatic pressure of molten salt can also cause the change of tank’s configuration. In this paper, a typical large molten salt storage tank has been studied. The critical buckling loads of the tank roof are obtained using nonlinear buckling analysis considering thermal loads and hydrostatic pressure. The results are discussed and some conclusions are proposed for engineering design.

Study on the Buckling Analysis of Stiffened Spherical Shallow Shell for Gasholder Roof

2013 ◽  
Vol 709 ◽  
pp. 320-324
Author(s):  
Dong Yun Jia ◽  
Jun Yang ◽  
De Jin Jiang
Keyword(s):  
Shallow Shell ◽  
Large Scale ◽  
Element Model ◽  
External Pressure ◽  
Buckling Analysis ◽  
Analysis Method ◽  
Plate Method ◽  
Rigidity Analysis ◽  
Shell Design ◽  
The Finite Element Model

Subjected to external pressure, buckling analysis is key problem in the roof shell design of large scale cylinder gasholder. Two simplified buckling analysis methods, the continuous orthotropic plate method and the split-rigidity method, are introduced to check the general instability of stiffened spherical shallow shell. Considering the plate and the stiffeners in two directions with the same contribution to the bending stiffness, the equivalent bending thickness formula is put forward. The finite element model for a 100,000 m³cylinder gasholder roof is setup. The buckling critical loads obtained prove that the split-rigidity analysis method and formulae are applicable. The results can be referred in design of stiffened spherical shallow shell.

Finite Element Modeling of Hydraulic Excavator in Soil Cutting Process

2011 ◽  
Vol 145 ◽  
pp. 240-244
Author(s):  
Wei Yang ◽  
Pan Ke Wei ◽  
Ji Ming Sun
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Large Scale ◽  
Element Model ◽  
Material Behavior ◽  
Von Mises Stress ◽  
Hydraulic Excavator ◽  
Arbitrary Lagrangian Eulerian ◽  
Elastic Plastic ◽  
Soil Cutting

A three-dimensional finite element model of hydraulic excavator is proposed to simulate soil cutting. To consider nonlinear soil behaviors, we apply the theory of Arbitrary Lagrangian-Eulerian (ALE) and explicit dynamic method to analyze a large scale fluid-solid structure interaction problem. The elastic-plastic assumption theory is introduced to simulate soil material behavior during the process of soil cutting because the nonlinear elastic-plastic model has advantages of simultaneously accounting for dynamic effects of strain hardening, strain rate, automatic mesh contact with friction capability, soil mechanical behavior and soil-bucket interaction. Soil-bucket interaction is modeled as friction with adhesion depending upon different influencing factors. This paper also investigates the parameters that may cause computational instability in soil cutting analysis. The difficulties in the numerical simulation of soil cutting are overcome by adopting suitable parameters to meet the requirement of proper mesh separation criterion. The proposed modeling can also be used to predict soil stress distribution, soil deformation and Von Mises stress distribution of component in hydraulic excavator.

scholarly journals Analysis of Current Production Status and Key Existing Problems of Tower-Shaped Solar Molten Salt Storage Tank

2021 ◽  
Author(s):  
Hang Xi ◽  
Qiong Wu ◽  
Xiaojun Xie ◽  
Ruigang Zhang ◽  
Bo Yang ◽  
...  
Keyword(s):  
Molten Salt ◽  
Storage Tank ◽  
Storage System ◽  
Thermal Power ◽  
Production Quality ◽  
Bottom Plate ◽  
Construction Technology ◽  
Existing Problems ◽  
Current Production

In this paper, the development and prospect of tower-shaped solar thermal power generation technology are briefly introduced, and the importance of production quality of molten salt storage tank in tower thermal power storage system is proposed. The production technology and construction process of molten salt storage tank are described in detail, and the key technology and multiple problems affecting quality are analysed. Aiming at the problem of fillet weld deformation, this paper proposes a new anti-deformation tooling and welding operation technology. At last, this paper presents a construction technology method and a solution to improve the welding quality of molten salt storage tank, which can effectively solve the problem that the bottom plate of molten salt storage tank is out of standard due to welding.

Nonlinear elastic/plastic buckling analysis of thick/thin skew plates under uniaxial and biaxial loading

2014 ◽  
Vol 229 (16) ◽  
pp. 2854-2867 ◽  
Author(s):  
Mahdi Maarefdoust ◽  
Mehran Kadkhodayan
Keyword(s):  
Boundary Conditions ◽  
Buckling Analysis ◽  
Differential Quadrature ◽  
Thickness Ratio ◽  
Published Data ◽  
Plastic Behavior ◽  
Skew Angle ◽  
Plastic Buckling ◽  
Elastic Plastic ◽  
Generalized Differential

In this study, elastic/plastic buckling analysis of thick skew plates subjected to uniaxial compression or biaxial compression/tension loading using the generalized differential quadrature method is presented for the first time. The governing differential equations are derived based on the incremental and deformation theories of plasticity and first-order shear deformation theory. The elastic/plastic behavior of the plates is described by the Ramberg–Osgood model. Generalized differential quadrature discretization rules in association with an exact coordinate transformation are simultaneously used to transform and discretize the equilibrium equations and the related boundary conditions. The results are compared with the previously published data to verify the established methodology and procedures. The effect of skew angle and thickness ratio on the convergence and accuracy of the method are studied. Moreover, the effects of aspect, loading and thickness ratios, skew angle, incremental, and deformation theories and different types of boundary conditions on the buckling coefficients are presented in detail. The results show that the difference between the incremental and deformation theories becomes greater with increasing thickness ratio and constraints at boundary conditions. Furthermore, the skew angle also has an important effect on differences between those theories.

Elastic-Plastic Dynamic Buckling Analysis of Reticular Domes Subjected to Earthquake Motion

1997 ◽  
Vol 12 (3-4) ◽  
pp. 205-215 ◽  
Author(s):  
Koichiro Ishikawa ◽  
Shiro Kato
Keyword(s):  
Dynamic Characteristics ◽  
Analytical Method ◽  
Buckling Analysis ◽  
Dynamic Buckling ◽  
Plastic Buckling ◽  
Static And Dynamic Characteristics ◽  
Elastic Plastic ◽  
Earthquake Motion

Static and Dynamic characteristics of shell-like structures such as reticular domes vary depending on their configuration. There is, however, very little information available concerning dynamic buckling collapse or dynamic buckling analysis. This paper presents a method for dynamic buckling analysis with emphasis on dynamic buckling behaviour subjected to vertical earthquake motion. The study focuses on the elastic-plastic buckling of the members of a large dome as well as on the global shell-like buckling of the dome. Through the analyses, the efficiency of the proposed analytical method is discussed while a method for estimating collapse accelerations is proposed.

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