Coupling Numerical Simulation of Resin Matrix Composites about Temperature and Degree of Cure Fields by Hot-Press Forming

2013 ◽  
Vol 788 ◽  
pp. 43-47
Author(s):  
Fei Sun ◽  
Dun Ming Liao ◽  
Peng Xu ◽  
Chang Chun Dong
Keyword(s):  
Three Dimensional ◽  
Exothermic Peak ◽  
Resin Matrix ◽  
Transient Temperature ◽  
Heating Process ◽  
Curing Process ◽  
Hot Press ◽  
Degree Of Cure ◽  
Resin Matrix Composite ◽  
The Impact

In this paper, a coupled numerical model of three-dimensional transient temperature field and degree of cure field for resin matrix composite curing process was developed. Using this model the hot-press curing process of the plate-shaped composite parts were simulated with considering the impact of tools and auxiliary materials. Thus, the temperature and degree of cure fields distribution in the entire process cycle were obtained. Numerical results show that the curing of the composite has a certain sequence. At the beginning, the composite is first curing at the boundary and gradually to the center. At the end stage, because of the higher curing rate, the center released a large amount of heat which makes the boundary curing simultaneously with center. In addition, there is a significant exothermic peak during the curing process. And the peak temperature is higher when it was closer to the center. This research effectively provides reference for optimizing the heating process parameters to improve product quality.

The Line Heating Temperature Field Theory Analysis and Numerical Simulation

2013 ◽  
Vol 316-317 ◽  
pp. 1087-1093
Author(s):  
Wei Zheng Xu ◽  
Shao Chun Zheng ◽  
Xu Dong Han
Keyword(s):  
Temperature Field ◽  
Waste Heat ◽  
Heating Temperature ◽  
Three Dimensional ◽  
Absorption Efficiency ◽  
Transient Temperature ◽  
Heating Process ◽  
Line Heating ◽  
Linear Partial Differential Equations ◽  
Gas Flame

This paper analyzed the endothermic efficiency of the plate in line heating process combing with the need of researching on the recovery of waste heat in the gas flame process. Firstly the non-linear partial differential equations of three-dimensional transient temperature field were derived with the analysis of hexahedron in the plate. Then the temperature field of the plate was numerically simulated using gaussian heat source heat flux model with ANSYS software. Finally the heat absorption efficiency formula of the plate was derived based on the finite volume method. The endothermic efficiency model in this paper provides a basis for further analysis of the whereabouts of the heat released in line heating process in theory.

The Research of Thermosetting Resin Matrix Composite Reinforcing Application in the Web of Truss Bridge

2012 ◽  
Vol 531 ◽  
pp. 638-641
Author(s):  
Li Wei ◽  
Guang Qing Zhou ◽  
Jia Guo Zheng ◽  
Kun Liang Liu
Keyword(s):  
Three Dimensional ◽  
Steel Structure ◽  
Resin Matrix ◽  
Three Dimensional Model ◽  
Finite Element Software ◽  
Concrete Members ◽  
Long Span ◽  
Long Span Bridge ◽  
Resin Matrix Composite ◽  
Truss Bridge

A significant number of concrete members were strengthened by carbon fiber reinforced polymer (CFRP).However there are only a few applications in strengthening steel structure with CFRP. The three-dimensional model of the long span bridge is made by using the finite element software ANSYS and do the force analysis of it ,then make composites reinforcement in order to Improve the structure strength and increase bridge life. The conclusion received of this paper is that composite patch at the end of web is more effective than in the middle of web. By picking up the stress distribution of every layer, the law of stress is obtained.

Influence Factors of Compressive Performance of Composite Foam Sandwich Tube

2013 ◽  
Vol 405-408 ◽  
pp. 740-743
Author(s):  
Feng Li ◽  
Kang Xu ◽  
Yan Na Wang ◽  
Jian Ping Wang
Keyword(s):  
Three Dimensional ◽  
Influence Factors ◽  
Single Layer ◽  
High Strength ◽  
Resin Matrix ◽  
Composite Foam ◽  
Damage Models ◽  
Layer Composite ◽  
Compressive Performance ◽  
Resin Matrix Composite

Composite foam sandwich tube, which is a sandwich structure, improves stability of the tube and strength for use compared with single-layer composite, and is available in civil engineering as bearing member of light weight, high strength, and corrosion resistance. Axial compression experiment was made for fiber reinforced resin matrix composite foam sandwich tube which is laid in 5 different ways, and the comparing analysis on damage models was made according to experimental phenomenon. The laws of influence is preliminarily recognized by analyzing influence to foam sandwich tube of fiber laying, modulus of fiber, three dimensional elastic modulus ratio, tube radius, tube thickness.

Modified Strip Model for Analyzing the Line Heating Method-Part 1: Elastic Plates

1991 ◽  
Vol 35 (02) ◽  
pp. 172-182
Author(s):  
Jong Gye Shin ◽  
Amiram Moshaiov
Keyword(s):  
Strain Field ◽  
Three Dimensional ◽  
Past Research ◽  
Stress Fields ◽  
Transient Temperature ◽  
Heating Process ◽  
Elastic Strip ◽  
Elastic Plates ◽  
Line Heating ◽  
Heating Method

The line heating method can be most useful in the automation of plate forming and for removal of undesired residual distortions during shipbuilding. The three-dimensional transient temperature and stress fields complicate the problem of simulating the line heating process. In past research efforts, a strip model taken perpendicular to the heated line was used. However, recent experimental and theoretical works have demonstrated the need for a different model. Recognizing that the existing strip model cannot be used effectively in the analysis of the stress-strain field during the line heating process, a modified strip model is suggested. In Part 1 of this paper, the concept of a modified strip is introduced by developing a theory for an elastic modified strip. The results of selected examples show that the modified strip model gives excellent results for elastic plates in comparison with a regular strip model. In Part 2 (to be published in a later issue of JSR), the theory is extended to the thermo-elastic-plastic modified strip. The concept of a modified elastic strip may have other useful applications and therefore is highlighted separately.

Thermal Conductivity of Polyimide Resin-Based Composite with Cu Fibers

2016 ◽  
Vol 848 ◽  
pp. 43-48
Author(s):  
Dan Zhang ◽  
Shuang Xi Wang ◽  
Gao Shan Liu ◽  
Wen Jun Wang ◽  
Feng Xiao
Keyword(s):  
Thermal Conductivity ◽  
Thermal Property ◽  
Matrix Composite ◽  
Copper Powder ◽  
Industrial Application ◽  
Three Dimensional ◽  
Resin Matrix ◽  
Wear Loss ◽  
Dimensional Network ◽  
Resin Matrix Composite

In some industrial application, thermal property of resin plays an important role as same as strength. Many attempts have been made to enhance the thermal conductivity of resin matrix composite. In this paper, the copper fibers were introduced to the polyimide-based composite. The experimental results showed that the thermal conductivity of polyimide-based composite with 15% Cu fibers was as high as 8.62W/mK which is more than three times that with Cu powders. The PI-Cu composites with copper fiber had a much lower wear loss than that with copper powder. The forming of three-dimensional network by Cu fibers makes it possible that the heat can conduct by electrons in the resin-based composite with Cu fibers.

scholarly journals The Regression Models of Impact Strength of Coir Coconut Fiber Reinforced Resin Matrix Composite Materials

2020 ◽  
Vol 1 (1) ◽  
pp. 32-38
Author(s):  
Muhamad Fitri ◽  
Shahruddin Mahzan
Keyword(s):  
Composite Materials ◽  
Impact Strength ◽  
Matrix Composite ◽  
Fiber Length ◽  
Natural Fibers ◽  
Fiber Content ◽  
Resin Matrix ◽  
Coconut Fiber ◽  
Resin Matrix Composite ◽  
The Impact

The need of coconuts in Indonesia is relatively high. The use of large quantities of coconuts produces large amounts of organic waste from coco fiber, which tends to become waste if it is not used to be beneficial for humans.One of the potential uses of coconut fiber is as a reinforcement of natural fibers in polymer matrix composite materials. Recently, the applications of composite materials have been expanded widely including structural angine component which whitstand certain load like impact load. But most of them used synthetic fiber. Although the use of natural fibers as reinforcement in composite materials has been widely studied, their use is still limited because natural fibers have their own advantages and disadvantages. The purpose of this study was to measure the impact strength of specimens of coconut fiber reinforced polymer matrix composite material, and to determine the effect of the length and concentration of coconut fiber on its impact strength. A significant and valid regression model was also generated in this research, that states the relationship between fiber length and fiber content of resin matrix composite material to its impact strength. The result shows that the impact strength of the samples were influenced by fiber content and fiber length. The regression models for the impact strength of  resin composite reinforced with coconut fiber is Y = 4.44 +0.180 X1 – 0.52 X2  Where: Y = Impact Strength (kJ/m2), and X1= Fiber length (mm), and X2= Fiber content (%).

Analyzing the Impact of X-Ray Tomography on the Reliability of Integrated Circuits

2015 ◽  
Author(s):  
Halit Dogan ◽  
Md Mahbub Alam ◽  
Navid Asadizanjani ◽  
Sina Shahbazmohamadi ◽  
Domenic Forte ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Integrated Circuit ◽  
3D Imaging ◽  
Three Dimensional ◽  
Serial Sectioning ◽  
Promising Technique ◽  
Flash Memories ◽  
X Ray ◽  
3D Information ◽  
The Impact

Abstract X-ray tomography is a promising technique that can provide micron level, internal structure, and three dimensional (3D) information of an integrated circuit (IC) component without the need for serial sectioning or decapsulation. This is especially useful for counterfeit IC detection as demonstrated by recent work. Although the components remain physically intact during tomography, the effect of radiation on the electrical functionality is not yet fully investigated. In this paper we analyze the impact of X-ray tomography on the reliability of ICs with different fabrication technologies. We perform a 3D imaging using an advanced X-ray machine on Intel flash memories, Macronix flash memories, Xilinx Spartan 3 and Spartan 6 FPGAs. Electrical functionalities are then tested in a systematic procedure after each round of tomography to estimate the impact of X-ray on Flash erase time, read margin, and program operation, and the frequencies of ring oscillators in the FPGAs. A major finding is that erase times for flash memories of older technology are significantly degraded when exposed to tomography, eventually resulting in failure. However, the flash and Xilinx FPGAs of newer technologies seem less sensitive to tomography, as only minor degradations are observed. Further, we did not identify permanent failures for any chips in the time needed to perform tomography for counterfeit detection (approximately 2 hours).

Boundary Condition Design to Heat a Moving Object at Uniform Transient Temperature Using Inverse Formulation

2004 ◽  
Vol 126 (3) ◽  
pp. 619-626 ◽  
Author(s):  
Hakan Ertu¨rk ◽  
Ofodike A. Ezekoye ◽  
John R. Howell
Keyword(s):  
Boundary Condition ◽  
Temperature Distribution ◽  
Design Problem ◽  
Manufacturing Industry ◽  
Three Dimensional ◽  
Chemical Deposition ◽  
Iterative Solution ◽  
Conveyor Belt ◽  
Temperature History ◽  
Transient Temperature

The boundary condition design of a three-dimensional furnace that heats an object moving along a conveyor belt of an assembly line is considered. A furnace of this type can be used by the manufacturing industry for applications such as industrial baking, curing of paint, annealing or manufacturing through chemical deposition. The object that is to be heated moves along the furnace as it is heated following a specified temperature history. The spatial temperature distribution on the object is kept isothermal through the whole process. The temperature distribution of the heaters of the furnace should be changed as the object moves so that the specified temperature history can be satisfied. The design problem is transient where a series of inverse problems are solved. The process furnace considered is in the shape of a rectangular tunnel where the heaters are located on the top and the design object moves along the bottom. The inverse design approach is used for the solution, which is advantageous over a traditional trial-and-error solution where an iterative solution is required for every position as the object moves. The inverse formulation of the design problem is ill-posed and involves a set of Fredholm equations of the first kind. The use of advanced solvers that are able to regularize the resulting system is essential. These include the conjugate gradient method, the truncated singular value decomposition or Tikhonov regularization, rather than an ordinary solver, like Gauss-Seidel or Gauss elimination.

scholarly journals Numerical simulation of the impact of an integrated renovation project on the Maowei Sea hydrodynamic environment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cui Wang ◽  
Ling Cai ◽  
Yaojian Wu ◽  
Yurong Ouyang
Keyword(s):  
Water Exchange ◽  
Land Reclamation ◽  
Three Dimensional ◽  
Exchange Capacity ◽  
Reclamation Project ◽  
Hydrodynamic Environment ◽  
Sea Area ◽  
Water Quality Models ◽  
The Impact ◽  
Main Factor

AbstractIntegrated renovation projects are important for marine ecological environment protection. Three-dimensional hydrodynamics and water quality models are developed for the Maowei Sea to assess the hydrodynamic environment base on the MIKE3 software with high resolution meshes. The results showed that the flow velocity changed minimally after the project, decreasing by approximately 0.12 m/s in the east of the Maowei Sea area and increasing by approximately 0.01 m/s in the northeast of the Shajing Port. The decrease in tidal prism (~ 2.66 × 106 m3) was attributed to land reclamation, and accounted for just 0.86% of the pre-project level. The water exchange half-life increased by approximately 1 day, implying a slightly reduced water exchange capacity. Siltation occurred mainly in the reclamation and dredging areas, amounting to back-silting of approximately 2 cm/year. Reclamation project is the main factor causing the decrease of tidal volume and weakening the hydrodynamics in Maowei Sea. Adaptive management is necessary for such a comprehensive regulation project. According to the result, we suggest that reclamation works should strictly prohibit and dredging schemes should optimize in the subsequent regulation works.

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