Deformation analysis of materials of 3D deformable solids using FEM simulation

2015 ◽  
Author(s):  
Wang Jing ◽  
Xu Qingtong ◽  
Wan wanggen ◽  
An Xuandong
Keyword(s):  
Fem Simulation ◽  
Deformation Analysis ◽  
Deformable Solids

scholarly journals The Deformation Analysis of a Deep Frame Top-Down Excavation in Downtown Shanghai Based on the 3D FEM

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ting Bai ◽  
Dong Xie
Keyword(s):  
Environmental Influence ◽  
Soft Clay ◽  
Fem Simulation ◽  
Fem Analysis ◽  
Deformation Analysis ◽  
Deep Excavation ◽  
Top Down ◽  
3D Fem ◽  
Qualitative Comparison ◽  
Construction Methods

The deformation and environmental influence of the pit excavation in downtown is very important. A 3D FEM analysis is conducted to understand the deformation of a 13.9 to 15.2 m deep excavation with an in-plane dimension of about 189 m width and 251 m length constructed by the frame top-down method (FTDM) in the soft clay region in the Shanghai metropolitan area. The field monitoring results indicate that the magnitudes of wall deflections and ground settlements, along with the column’s uplift difference, are relatively small, which are below the specified protection levels, and that the FTDM is feasible as one of the extralarge excavation construction methods. It is reasonable to predict wall deflection by 3D FEM simulation with qualitative comparison between the simulated column uplifts and the measured data, yet the prediction of the settlement distribution is of no satisfaction. This project studied in this paper not only serves as a special case study calibrated and verified by numerical tools but also provides insights into the design and construction of an extralarge deep excavation using the frame top-down method in soft soils and metropolitan environment.

scholarly journals Machining Deformation Analysis of Aircraft Monolithic Components based on the Energy Method

2021 ◽  
Author(s):  
Xiaoming Huang ◽  
Xiaoliang Liu ◽  
Jiaxing Li ◽  
Yongbin Chen ◽  
Dechen Wei ◽  
...  
Keyword(s):  
Initial Stress ◽  
Analytical Model ◽  
Energy Method ◽  
Fem Simulation ◽  
Deformation Energy ◽  
Deformation Analysis ◽  
Layer By Layer ◽  
Theoretical Approaches ◽  
Machining Deformation ◽  
Monolithic Components

Abstract In the process of machining aircraft monolithic components, the initial stress in the blank will cause machining deformation. Based on the energy method, an analytical mathematical model of machining deformation is presented in this paper. The key point is to transform the energy in the removed material into the deformation energy of the part after machining. The initial residual stress of 7050-T7451 aluminum alloy blank and single frame part are used as investigated case in the analytical model. For layer by layer machining, the deformation evolution is closely related to the tensile or compressive properties of the initial stress of removed material. Combined with the change of neutral axis position, The machining deformation is calculated by theoretical model. Then, FEM simulation is carried out to analyze the influence of stiffening ribs on machining deformation utilizing the semi-analytical model of equivalent bending stiffness. Furthermore, experiments are set up to verify the validity of the theory and FEM data. The results indicate that the deformation results of the experiment are consistent with that of theory and FEM model. Deformation is determined by energy of removed material. This paper provides a novel theoretical approaches for the further investigation of this issue.

scholarly journals Machining Deformation Analysis of Aircraft Monolithic Components Based on the Energy Method

2021 ◽  
Author(s):  
Xiaoming Huang ◽  
Xiaoliang Liu ◽  
Weitao Sun ◽  
Jiaxing Li ◽  
Yongbin Chen ◽  
...  
Keyword(s):  
Initial Stress ◽  
Analytical Model ◽  
Energy Method ◽  
Fem Simulation ◽  
Deformation Energy ◽  
Deformation Analysis ◽  
Layer By Layer ◽  
Theoretical Approaches ◽  
Machining Deformation ◽  
Monolithic Components

Abstract In the process of machining aircraft monolithic components, the initial stress in the blank will cause machining deformation. Based on the energy method, an analytical mathematical model of machining deformation is presented in this paper. The key point is to transform the energy in the removed material into the deformation energy of the part after machining. The initial residual stress of 7050-T7451 aluminum alloy blank and single frame part are used as investigated case in the analytical model. For layer by layer machining, the deformation evolution is closely related to the tensile or compressive properties of the initial stress of removed material. Combined with the change of neutral axis position, The machining deformation is calculated by theoretical model. Then, FEM simulation is carried out to analyze the influence of stiffening ribs on machining deformation utilizing the semi-analytical model of equivalent bending stiffness. Furthermore, experiments are set up to verify the validity of the theory and FEM data. The results indicate that the deformation results of the experiment are consistent with that of theory and FEM model. Deformation is determined by energy of removed material. This paper provides a novel theoretical approaches for the further investigation of this issue.

scholarly journals TLS-FEM INTEGRATED STRUCTURAL DEFORMATION ANALYSIS ON THE BEAMLESS HALL AT NANJING, CHINA

2021 ◽  
Vol XLVI-M-1-2021 ◽  
pp. 215-220
Author(s):  
J. W. Fang ◽  
Z. Sun ◽  
Y. R. Zhang
Keyword(s):  
Point Cloud ◽  
Laser Scanning ◽  
3D Model ◽  
Fem Simulation ◽  
Structural Deformation ◽  
Geometric Feature ◽  
Deformation Analysis ◽  
Masonry Building ◽  
Deviation Analysis ◽  
Geometric Deviation

Abstract. A method integrating terrestrial laser scanning (TLS) and finite element modelling (FEM) is proposed in this study. It aims at assessing the structural deformation of a historic brick-masonry building, the Beamless Hall at Linggu Temple in Nanjing, China. The building was composed of a series of vaults and arches, the largest among whom spans over 11m. TLS (Z+F Imager5010X) was used to collect 3D point cloud with high density. Point slices and geometric feature computation (verticality) were employed to detect geometric displacement quantitatively and intuitively. FEM-simulation was based on an ideal 3D model ignoring geometric anomalies. Results show that the Beamless Hall has inherent structural defect owing to its asymmetric layout along the transverse axis. Computing geometric feature of point cloud is fast and intuitive to detect and show geometric deviation. Inferred by FEM-simulated results and TLS-based deviation analysis, the building’s asymmetrical layout under self-weight is probably the main reason causing its structural deformation. Further developments include FEM based on as-built geometry, corrected materials parameters, and a comprehensive geometric deviation analysis.

Modeling Slope Anchor Reinforcement Using Enhanced Discontinuous Deformation Analysis Method (EDDA) with Natural Neighbor Interpolation

2014 ◽  
Vol 638-640 ◽  
pp. 680-683 ◽  
Author(s):  
Yong Zheng Ma ◽  
Ke Jian Cai ◽  
Zhan Tao Li ◽  
Chun Xia Song
Keyword(s):  
High Order ◽  
Numerical Results ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Analysis Method ◽  
Shape Functions ◽  
Deformable Solids ◽  
Slope Reinforcement ◽  
Natural Neighbor ◽  
Discontinuous Deformation

A new enhanced Discontinuous Deformation Analysis method (EDDA) in conjunction with Natural Neighbor Interpolative (NNI) bases for modeling the system composed of high order deformable solids is developed. The advantages of NNI lie in its efficiency and the interpolative property when employed as the shape functions. The anchor reinforcement algorithm is also implemented in the EDDA for modeling high order deformable solids. The numerical results of simple problems by using the proposed method agree well with the corresponding analytical results, and certain slope reinforcement problems are also simulated with rational numerical results, which verify efficiency and accuracy of the EDDA.

scholarly journals Capabilities of Using Fem in Sheet-Metal Forming

2016 ◽  
Vol 61 (2) ◽  
pp. 947-951
Author(s):  
S. Korga ◽  
A. Duda ◽  
Z. Ciekanowski
Keyword(s):  
Research Methods ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Fem Simulation ◽  
Fem Analysis ◽  
Operating Conditions ◽  
Deformation Analysis ◽  
Plastic Processing ◽  
Metal Deformation

Abstract The aim of this study was to determine and select boundary conditions of modeling and FEM simulation for plastic processing on the example of sheet-metal forming. For sheet-metal deformation analysis, Deform 3D has been used. The study presents research methods for real and virtual conditions. There are also described common features and these differentiating obtained results. Research of conducted process of sheet-metal forming allows to determine the effectiveness of computer research methods. The finite-element method can be used as an effective tool for the study of plastic processing phenomena considering various operating conditions of individual elements provided the appropriate tools for FEM analysis.

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