scholarly journals Research on Finite Element Model Modification of Carbon Fiber Reinforced Plastic (CFRP) Laminated Structures Based on Correlation Analysis and an Approximate Model

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2623 ◽  
Author(s):  
Yizheng Zhang ◽  
Yu’e Yang ◽  
Wenhao Du ◽  
Qing Han
Keyword(s):  
Finite Element ◽  
Correlation Analysis ◽  
Finite Element Model ◽  
Element Model ◽  
Approximate Model ◽  
Laminated Structure ◽  
Fiber Reinforced Plastic ◽  
Model Modification ◽  
Reinforced Plastic ◽  
Laminated Structures

Carbon fiber reinforced plastic (CFRP) laminated structures have been widely used in modern engineering due to their excellent material properties, especially in the aerospace and shipping industries. This requires a high-accuracy finite element model of CFRP laminated structures. However, it is difficult to master the mechanical properties of CFRP structures comprehensively and accurately due to influences from multiple aspects, such as dispersion of material properties, uncertainty of manufacturing technologies, etc. Therefore, a finite element model modification method of CFRP laminated structures based on correlation analysis and an approximate model was proposed. Aiming at minimizing the difference between the analysis model and the measured inherent frequency, the proposed method improves the finite element modeling accuracy of CFRP laminated structures, by iterative optimization based on a global optimization algorithm. In order to solve the problem of high spatial dimension and slow searching in modification of CFRP laminated structure models, the Pearson correlation analysis method was used to screen the material parameters which exert significant impacts on frequency characteristics to reconstruct the searching space. Based on significance parameters, an approximate response model of the CFRP laminated structural system was established. Meanwhile, the modeling accuracy of different orders of response surface models (RSM) and a radial basis function (RBF) neural network model was analyzed, and the best approximate modeling scheme was obtained. The approximate model was updated based on the multi-island genetic algorithm (MIGA) to modify the finite element model of the CFRP laminated structure model. The maximum error and mean error of the updated model are 1.47% and 0.45%. It was proved that the material parameters modified by the proposed method are applicable to simulation analysis of the CFRP laminated structure.

Finite-Elemente-Modell für die Drapiersimulation*/A finite element model for draping simulation

2017 ◽  
Vol 107 (03) ◽  
pp. 118-123
Author(s):  
U. Prof. Bracht ◽  
Y. Jiao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Automobile Industry ◽  
Mass Production ◽  
Element Model ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Finite Elemente ◽  
Draping Simulation ◽  
Simulation Results

Da Bauteile aus carbonfaserverstärkten Kunststoffen (CFK) im Verhältnis zum Gewicht ausgezeichnete Materialeigenschaften besitzen, werden in der Automobilindustrie Möglichkeiten für eine effiziente Massenproduktion von Bauteilen aus CFK gesucht. Der Einsatz der numerischen Simulation, um das mechanische Verhalten von CFK zu berechnen, ist besonders anspruchsvoll. Diese Arbeit stellt ein Finite-Elemente-Modell zur Simulation des Drapierprozesses für CFK-Bauteile vor. Die Validierung des Modells erfolgt über einen Vergleich von Versuchs- und Simulationsergebnissen.   Since components made of carbon-fiber-reinforced plastic (CFRP) have outstanding material properties, the automobile industry is dedicated to searching an efficient way of mass production for CFRP components. The use of numerical simulation for calculating the mechanical behavior of CFRP material is highly demanding. In this work, a finite element model for simulating the draping process for CFRP components is introduced. The model is validated by comparing experiment and simulation results.

Finite Element Analysis of Top-Hat–Stiffened Panels of Fiber-Reinforced–Plastic Boat Structures

2007 ◽  
Vol 44 (01) ◽  
pp. 16-26
Author(s):  
Ömer Eksik ◽  
R. Ajit Shenoi ◽  
Stuart S. J. Moy ◽  
Han Koo Jeong
Keyword(s):  
Finite Element ◽  
Lateral Pressure ◽  
Three Dimensional ◽  
Element Model ◽  
Stiffened Panel ◽  
Element Analysis ◽  
Stiffened Panels ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Experimental Findings

This paper describes the development of a finite element model in order to assess the static response of a top-hat-stiffened panel under uniform lateral pressure. Systematic calculations were performed for deflection, strain, and stress using the developed model based on the ANSYS three-dimensional solid element (SOLID45). The numerical modeling results were compared to the experimental findings for validation and to further understand an internal stress pattern within the different constituents of the panel for explaining the likely causes of the panel failure. Good correlation between experimental and numerical strains and displacements was achieved.

Cutting Characteristics of Sugarcane in Terms of Physical and Chemical Properties

2020 ◽  
Vol 63 (4) ◽  
pp. 1007-1017
Author(s):  
Luxin Xie ◽  
Jun Wang ◽  
Shaoming Cheng ◽  
Dongdong Du
Keyword(s):  
Finite Element ◽  
Chemical Composition ◽  
Correlation Analysis ◽  
Finite Element Model ◽  
Physical Properties ◽  
Cutting Force ◽  
Single Point ◽  
Cutting Speed ◽  
Element Model ◽  
Cutting Process

HighlightsThe cutting mechanism of sugarcane stalks using single-point clamping was analyzed.Physical properties, chemical composition, and maximum cutting force of sugarcane were explored.Strong and complicated correlations between physical properties and chemical composition were established.Stress distributions in sugarcane stalks and the cutting blade were predicted using a finite element model.Abstract. Research on the cutting characteristics of sugarcane stalks is of great significance to improve harvest mechanization. In this study, perpendicular cutting of sugarcane stalks at six different nodes and internodes along the stalk was tested using a single-point clamping method at three cutting speeds (30, 40, and 50 mm min-1). The physical properties and chemical composition were also measured. At the 50 mm min-1 cutting speed, the maximum cutting forces at nodes and internodes upward along the stalk decreased gradually from 810 to 530 N and from 600 to 440 N, respectively. The maximum cutting force was positively correlated with the cutting speed at the same position. Differences in the microstructures of nodes, internodes, and epidermis were revealed by SEM micrographs. The physical properties and chemical composition of the stalks showed significant correlations. Correlation analysis was used to clarify the complicated interrelationships among these independent variables and revealed the interacting mechanism between physical properties and chemical composition. A finite element model was established to simulate the sugarcane cutting process. Results showed that the simulated cutting resistance of the blade was close to that in the experiments. The maximum Von Mises stress of the sugarcane stalk and blade in the cutting process were about 23.34 and 254.17 MPa, respectively. The results of this study provide guidance for designing and optimizing base-cutters of sugarcane harvesters and similar cutting equipment. Keywords: Chemical composition, Correlation analysis, Cutting characteristics, Microstructure, Physical properties, Simulation.

Compressive behaviour of fibre reinforced plastic with random fibre packing and a region of fibre waviness

2016 ◽  
Vol 36 (5) ◽  
pp. 323-337 ◽  
Author(s):  
Li Zhang ◽  
Shufeng Zhang ◽  
Yuanxiang Jiang ◽  
Junyong Tao ◽  
Xun Chen
Keyword(s):  
Finite Element ◽  
Compressive Strength ◽  
Finite Element Model ◽  
Latin Hypercube Sampling ◽  
Element Model ◽  
Latin Hypercube ◽  
Compressive Behaviour ◽  
Reinforced Plastic ◽  
Random Fibre ◽  
Fibre Packing

A critical limitation of fibre reinforced plastic is its large variability on mechanical performance, especially the longitudinal compressive strength. The influence of fibre random packing and waviness on the compressive strength of UD fibre reinforced plastic is studied in this paper. Three-dimensional geometrically non-linear finite element model is constructed to investigate the compressive behaviour, and an improved approach named Latin hypercube sampling based on random sequential expansion is proposed to generate random fibre distribution across the cross-section. Latin hypercube sampling based on random sequential expansion provides high computation efficiency and good distribution characteristics in comparison to previously proposed methods. Fibre waviness defect with different misalignment angles is also incorporated in the finite element model. It is shown that random fibre packing tends to result in a stochastic detriment of fibre reinforced plastic compressive strength in comparison with uniform fibre packing condition, and the stochastic variation of compressive strength tends to follow normal or lognormal distribution.

Dynamic finite element model for laminated structures

1983 ◽  
Vol 16 (1-4) ◽  
pp. 449-455 ◽  
Author(s):  
D.W. Pillasch ◽  
J.N. Majerus ◽  
A.R. Zak
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Dynamic Finite Element ◽  
Laminated Structures

Innovative Chassis Made From EPP and CFRP of an Urban-Concept Vehicle

2020 ◽  
Author(s):  
P. Stabile ◽  
F. Ballo ◽  
M. Gobbi ◽  
G. Mastinu
Keyword(s):  
Finite Element ◽  
Energy Consumption ◽  
Sandwich Structure ◽  
High Efficiency ◽  
Element Model ◽  
The Body ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Concept Vehicle

Abstract The paper presents a fully new chassis of a high efficiency vehicle for the Shell Eco-marathon competition. The chassis is realized by a sandwich structure with an expanded polypropylene (EPP) core and carbon fiber reinforced plastic (CFRP) external skins. The chassis is connected to the body to realize a safe and stiff structure. Numerical analyses have been performed to assess the stiffness, safety and dynamic eigenfrequencies of the chassis. A Finite Element model of the entire chassis and body was developed. The manufacturing process of the entire chassis and body is described in the paper and some data obtained during on-track tests of the vehicle are presented. The vehicle reached the 4th place at the 2019 edition of the Shell Eco-marathon competition, with an equivalent energy consumption of 184 km/kWh.

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