Optimization Based on Design of Experiments (DOE) Using Finite Element Model (FEM) Analysis Applied to Retrofitting the Church of Baldornon, Spain

The study covers the modeling three-layered beam incorporating a magnetorheological (MR) fluid. The beam finite element model was created using the ANSYS software. The beam comprises two outer layers made of aluminium and MR fluid layer in between, sealed with silicone rubber. Interactions of the magnetic field are taken into account by varying the parameters of the finite elements. Data required for identification were collected from results of measurement of the beams free vibrations. The identification procedure assumes the good agreement between the frequencies of the beams free vibrations and dimensionless damping coefficients obtained from research and computation data. The validity of proposed beams finite element model was also investigated. Finally some numerical results were presented.

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Finite element model updating of a satellite honeycomb sandwich plate in structural dynamics

International Journal of Space Structures ◽

10.1177/09560599211001683 ◽

2021 ◽

pp. 095605992110016

Author(s):

Ali Aborehab ◽

Mohamed Kamel ◽

Ahmed Farid Nemnem ◽

Mohammed Kassem

Keyword(s):

Finite Element ◽

Design Of Experiments ◽

Finite Element Model ◽

Response Surface ◽

Sandwich Plate ◽

Model Updating ◽

Element Model ◽

Finite Element Model Updating ◽

Surface Method ◽

Honeycomb Sandwich

The honeycomb sandwich structures have a crucial participation in aerospace industry, especially in the design of satellite structures due to their exceptional mechanical properties. The equivalent finite element modeling of such structures is initially presented through the implementation of modal analysis via the three-layered sandwich theory. Subsequently, the computational results are validated by carrying out an experimental modal testing. In addition, sensitivity analysis based upon design of experiments and parameters correlation, is executed for the sake of selecting the most appropriate design parameters for the optimization problem. Finally, finite element model updating of a honeycomb sandwich plate is thoroughly introduced using three optimization algorithms including genetic algorithms, adaptive-multiple optimization, and response surface method. A good agreement between the previously-mentioned optimization algorithms is obtained. Meanwhile, response surface method and its related design of experiments tool succeed in avoiding such time-consuming process and reduce the involved computational expense with an acceptable accuracy.

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FEM Analysis and Optimization of Large Load Suspended Platform

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.569.415 ◽

2012 ◽

Vol 569 ◽

pp. 415-419

Author(s):

Xi Jian Zheng ◽

Yong Shang Han ◽

Zheng Yi Xie

Keyword(s):

Finite Element Method ◽

Finite Element Analysis ◽

Finite Element ◽

Finite Element Model ◽

Fem Analysis ◽

Element Model ◽

Test Results ◽

The Finite Element Method ◽

Element Analysis ◽

The Finite Element Model

Based on the Finite Element Method, the suspended platform of temporarily installed suspended access equipment was simplified and the special connection positions were dealt with rigidization and coupling, thus the finite element model of suspended platform was established. Analyzing major structures of finite element model in different section dimensions, the reasonable scheme could be ascertained and the section dimensions of major structures in different materials could be obtained. Combining with the test results, the rationality of finite element analysis could be proved. The study could provide reference for the similar products on design and development.

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Lateral Pillar is the Key in Supporting Pre-collapse Osteonecrosis of the Femoral Head: A Finite Element Model Analysis of Propensity-Score Matched Cohorts

10.21203/rs.3.rs-1020678/v1 ◽

2021 ◽

Author(s):

Ji Hoon Bahk ◽

Woo-Lam Jo ◽

Seung-Chan Kim ◽

Soon-Yong Kwon ◽

Youngwook Lim

Keyword(s):

Finite Element ◽

Stress Concentration ◽

Propensity Score ◽

Finite Element Model ◽

Propensity Score Matching ◽

Young Patients ◽

Fem Analysis ◽

Element Model ◽

Control Group ◽

Lateral Pillar

Abstract Background This study was designed as a cohort study using propensity-score matching to age and gender for finite element model (FEM) analysis from pre-collapse CT images of collapsed and non-collapse hips. Through FEM analysis, a global graphical output around the hip joint can provide simple impression of stress distribution: concentration or dispersion. Methods 32 hips with ARCO stage 2 or 3 ONFH who were on follow up for over one-year period were retrospectively reviewed. 16 hips with no interval progression of collapse were set as the study group, then 16 hips with progression of collapse which required arthroplasty were set as the control group using propensity-score matching. FEM was generated through Mechanical Finder for each patient, then 4500 Newtons of load was applied to 1,000mm2 area at the top of iliac crest to analyze equivalents for yield stress. Results Age, sex, and BMI had no significant differences, while location (p=0.015) was lateral, and size (p=0.015) was significantly greater in the collapsed group. Non-collapsed hips mostly exhibited stress dispersion allocated to medial and lateral pillars, while collapsed hips exhibited stress concentration focused on the lateral pillar and the primary compression trabecula. (p=0.001) Conclusion FEM analysis suggests stress concentration to the lateral pillar and the primary compression trabeculae can predict future collapse in ONFH with high probability. Results provide a simple and intuitive, yet valuable information to aid surgeons. Therefore, especially for young patients, holding out the lateral pillar through joint preserving procedures might be the key in preventing further collapse.

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Preliminary Study on Different Materials of Geogrid by using Finite Element Model

Journal of Physics Conference Series ◽

10.1088/1742-6596/2129/1/012067 ◽

2021 ◽

Vol 2129 (1) ◽

pp. 012067

Author(s):

Aida Atiqah Atil ◽

Nik Normunira Mat Hassan ◽

Fatimah Mohamed Yusop ◽

Anika Zafiah M. Rus ◽

Abdul Mutalib Leman ◽

...

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Life Cycle Cost ◽

Fem Simulation ◽

Fem Analysis ◽

Element Model ◽

Specimen Size ◽

Displacement Rate ◽

Cost Ratio ◽

Preliminary Study

Abstract In recent years, environmental concerns related to the overexploitation of natural resources and the need to manage large amounts of wastes arising from construction activities have intensified. This paper presents a preliminary study carried out to characterize the interaction impact with different material geogrids (a polyester (PET), high-density polyethylene (HDPE), and polyurethane (PU) geogrid through Finite Element Model (FEM) simulation. The effects of the geogrid specimen size, displacement rate by the pressure through the geogrids are evaluated. The results show that the measured peak pullout resistance of the geogrid increases with the specimen size imposed displacement rate The pressure ranged from 10 000 N/m2 and 50 000 N/m2. The FEM analysis result is important due to quantify the benefit-cost ratio of geosynthetics application in pavements needed for a detailed Life-Cycle Cost Analysis (LCCA).

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Lateral pillar is the key in supporting pre-collapse osteonecrosis of the femoral head: a finite element model analysis of propensity-score matched cohorts

Journal of Orthopaedic Surgery and Research ◽

10.1186/s13018-021-02875-8 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Ji Hoon Bahk ◽

Woo-Lam Jo ◽

Seung-Chan Kim ◽

Soon-Yong Kwon ◽

Young Wook Lim

Keyword(s):

Finite Element ◽

Stress Concentration ◽

Propensity Score ◽

Finite Element Model ◽

Propensity Score Matching ◽

Young Patients ◽

Fem Analysis ◽

Element Model ◽

Control Group ◽

Lateral Pillar

Abstract Background This study was designed as a cohort study using propensity-score matching to age, gender, and body mass index (BMI) for finite element model (FEM) analysis from pre-collapse CT images of collapsed and non-collapsed hips. Through FEM analysis, a global graphical output around the hip joint can provide simple impression of stress distribution: concentration or dispersion. Methods A total of 32 hips with ARCO stage 2 or 3 ONFH who were on follow up for over a one-year period were retrospectively reviewed. 16 hips with no interval progression of collapse were set as the study group, then 16 hips with progression of collapse which required arthroplasty were set as the control group using propensity-score matching. FEM was generated through Mechanical Finder for each patient, then 4500 N of load was applied to 1000 mm2 area at the top of iliac crest to analyze the models in terms of equivalents for yield stress. Results Age, sex, and BMI had no significant differences between the two groups, while location (p = 0.015) was lateral, and size (p = 0.015) was significantly greater in the collapsed group. Non-collapsed hips mostly exhibited stress dispersion allocated to medial and lateral pillars, while collapsed hips exhibited stress concentration focused on the lateral pillar and the primary compression trabecula. (p = 0.001). Conclusion Through FEM analysis, stress concentration to the lateral pillar and the primary compression trabeculae can be used to predict future collapse in ONFH with high probability. Results provide a simple and intuitive, yet valuable information to aid surgeons. Therefore, especially for young patients, holding out the lateral pillar through joint preserving procedures might be the key in preventing further collapse.

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Finite Element Model Analysis of 3-D Angle-Interlock Woven Composite under Quasi-Static Tensile Loading

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.249-250.823 ◽

2012 ◽

Vol 249-250 ◽

pp. 823-827

Author(s):

Hang Jun Hu ◽

Li Min Jin ◽

Bao Zhong Sun

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Static Loading ◽

Three Dimensional ◽

Fem Analysis ◽

Element Model ◽

Woven Composite ◽

Micro Structure ◽

Fem Method ◽

Static Tensile

The tensile response of three-dimensional angle-interlock woven composite (3DAWC) under quasi-static loading was investigated in experimental and finite element model (FEM) analysis. The FEM analysis was based on micro-structure at yarn level and connected with commercial FEM software ABAQUS/Explicit (ver. 6.10) to calculate the tensile property under quasi-static loading. The experimental and FEM stress-strain results were compared. Good agreement proved that the FEM method based on micro-structure was reasonable and effective and could be used to design 3-D woven structural composite.

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