scholarly journals Simulation of Mould Filling in Resin Transfer Moulding

1998 ◽  
Vol 7 (1) ◽  
pp. 096369359800700 ◽  
Author(s):  
H.G.H. Van Melick ◽  
G.A.A.V. Haagh ◽  
F.N. Van De Vosse ◽  
T. Peijs
Keyword(s):  
Finite Element ◽  
Production Method ◽  
Finite Element Code ◽  
Resin Transfer Moulding ◽  
Finite Element Program ◽  
Reinforced Plastics ◽  
Rtm Process ◽  
Simulation And Experiment ◽  
Transfer Moulding ◽  
Good Agreement

Resin transfer moulding is a production method of fibre reinforced plastics which involves the flow of a resin through a mould packed with dry reinforcement. As simulation by finite element code can be a useful tool in designing the mould or optimising the process, mathematical modelling of RTM is indispensable. The equations concerning the isothermal RTM process with a Newtonian fluid are implemented in the finite element program VI p, applying the ‘thin film approximation’. To validate the code, model experiments are performed in which the position of the front as a function of time is monitored and compared to the results of a finite element simulation. A good agreement between simulation and experiment was found. For further validation of more complex mould geometries a plate with inserts is considered. Again good agreement was found between simulation and experiment was found. The finite element code of VI p proves to give reliable and accurate results in the simulation of the isothermal filling process of RTM and can therefore be used for designing mould geometries or optimisation of the RTM process as a whole.

scholarly journals Evaluation of Strains at the Bottom of the Asphalt Base Layer of a Semi-Rigid Pavement Under a Class 6 Vehicle

2019 ◽  
Vol 271 ◽  
pp. 08008
Author(s):  
Mohsen Talebsafa ◽  
Stefan A. Romanoschi ◽  
Athanassios T. Papagiannakis ◽  
Constantin Popescu
Keyword(s):  
Finite Element ◽  
Longitudinal Direction ◽  
Element Model ◽  
Base Layer ◽  
Rigid Pavement ◽  
Finite Element Program ◽  
Element Program ◽  
Transverse Strains ◽  
Longitudinal Strains ◽  
Good Agreement

A newly constructed pavement on US-287 near Mansfield, TX was instrumented with gauges installed at the bottom of the asphalt concrete base layer to measure the longitudinal and transverse strains developed under a test vehicle. The finite element program Abaqus was used to compute the strains at the location of the gauges; they were found in good agreement with the measured strains. The research showed that the strains under the steering axle were of similar magnitude as the strains under the rear tandem axle. The measured transverse strains were in general slightly bigger than the corresponding longitudinal strains, while the finite element model computed higher strains in the longitudinal direction. These findings suggest the need to account for the strain responses from the steering axle of trucks and to account for both the longitudinal and the transverse strains when computing the fatigue damage induced by trucks.

A Method of Improving Limiting Drawing Ratio：Differential Temperature Deep Drawing Based on Superplasticity

2011 ◽  
Vol 239-242 ◽  
pp. 392-397
Author(s):  
Xue Feng Xu ◽  
Ning Li ◽  
Gao Chao Wang ◽  
Hong Bo Dong
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Deep Drawing ◽  
Thickness Distribution ◽  
Coupled Analysis ◽  
Flowing Water ◽  
Finite Element Code ◽  
Uniform Thickness ◽  
Forming Process ◽  
Good Agreement

A thermal-mechanical coupled analysis of superplastic differential temperature deep drawing (SDTDD) with the MARC finite element code is performed in this paper. Initial drawing blank of an AA5083 bracket was calculated and adjusted according to the simulation result. During the SDTDD simulation, the power-law constitutive model of AA5083 was established as function of temperature and implanted in software MARC through new complied subroutine. Under the guide of the numerical simulation, the die was fabricated and the AA5083 bracket was successfully manufactured via superplastic differential temperature deep drawing. In forming practice, the temperature of female die was kept at 525°C, i.e. the optimal superplastic temperature of AA5083, and the punch was cooled by the flowing water throughout the forming process. The drawing velocity of punch was 0.1mm/s. Results revealed that the formed bracket had a sound uniform thickness distribution. Good agreement was obtained between the formed thickness profiles and the predicted ones.

Numerical Simulation of Masonry Walls Subjected to Blast Loads

2012 ◽  
Vol 461 ◽  
pp. 93-96
Author(s):  
Xiao Jun Yuan ◽  
Li Chen ◽  
Jian Hua Wu ◽  
Jing Xin Tang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Results ◽  
Dynamic Responses ◽  
Masonry Walls ◽  
Blast Loads ◽  
Finite Element Program ◽  
Element Program ◽  
Good Agreement

Much effort has been devoted to studying the blast properties of masonry infilled panels due to recent increasing accidental blast events. In this paper, the blast properties of the masonry infilled walls were analyzed with the finite element program LS-DYNA by the way of distinctive consideration of the bricks and mortar material in contrast to the experimental data. The numerical results have a good agreement with experimental data. The reliability and efficiency of this method in predicting the dynamic responses of masonry walls to blast loads was proven.

Elektrostatische Greifersysteme für den Leichtbau*/Electrostatic grippers for lightweight productions - Form- and area-adaptive electrostatic gripper systems for high-performance materials

2015 ◽  
Vol 105 (09) ◽  
pp. 567-572
Author(s):  
C. Brecher ◽  
C. Kukla ◽  
R. Schares ◽  
M. Emonts
Keyword(s):  
High Performance ◽  
Textile Materials ◽  
Reinforced Plastics ◽  
Rtm Process ◽  
Process Chains ◽  
Fiber Reinforced Plastics ◽  
Adhesive Effect ◽  
Transfer Moulding ◽  
Automated Handling ◽  
Gripper Systems

In der Herstellung von Leichtbaukomponenten aus faserverstärkten Kunststoffen treten Handhabungsvorgänge mit empfindlichen, luftdurchlässigen, biegeschlaffen Materialien auf. Um diese Vorgänge in der Produktion etwa in RTM (Resin Transfer Moulding)-Prozessketten zu automatisieren, hat das Fraunhofer IPT einen Greifer für die Handhabung textiler Materialien entwickelt. Dieser Greifer basiert auf der elektrostatischen Adhäsion und ermöglicht automatisiertes Handhaben und Drapieren textiler Hochleistungsmaterialien.   Handling operations with sensitive non-rigid, air-permeable materials are often found in the production of lightweight products made out of fiber-reinforced plastics. In order to further automate the production of light-weight components, for instance in RTM-process-chains, Fraunhofer IPT developed a gripping system especially suitable for sensitive textile materials. This gripper is based on the electro-adhesive effect and enables for the automated handling and draping of textile materials.

Numerical Simulation of Blast Loadings on a Thick-Walled Cylindrical Vessel

2007 ◽  
Author(s):  
Guide Deng ◽  
Ping Xu ◽  
Jinyang Zheng ◽  
Yongjun Chen ◽  
Yongle Hu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Dynamic Response ◽  
Rigid Wall ◽  
Cylindrical Vessel ◽  
Finite Element Code ◽  
Explicit Finite Element ◽  
Shell Deformation ◽  
Blast Loadings ◽  
Good Agreement

Determining blast loadings on an explosion containment vessel (ECV) is the foundation to design the ECV. Explosion of TNT centrally located in a thick-walled cylindrical vessel and its impact on the cylinder was simulated using the explicit finite element code LS-DYNA. Blast loadings on the cylinder computed are in good agreement with the corresponding experimental results. Then wall thickness and yield stress of the cylinder were changed in the following simulation to investigate effect of shell deformation on blast loadings. It is revealed that shell deformation during the primary pulses of blast loadings is so slight that it has little influence on the blast loadings. Though the deformation may increase greatly after the primary pulses, the dynamic response of an ECV is mainly affected by the primary pulses. Therefore, decoupled analyses are appropriate, in which the shell of an ECV is treated as a rigid wall when determining blast loadings on it.

scholarly journals An improved computational method for non isothermal resin transfer moulding simulation

2011 ◽  
Vol 15 (suppl. 2) ◽  
pp. 275-289 ◽  
Author(s):  
Aouatif Saad ◽  
Adil Echchelh ◽  
Mohammed Hattabi ◽  
Ganaoui El
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Control Volume ◽  
Thermal Engineering ◽  
Temperature Pattern ◽  
Optimization Approach ◽  
Resin Transfer Moulding ◽  
Time Step ◽  
Transfer Moulding ◽  
Element Method

The optimization in the simulation time of non-isothermal filling process without losing effectiveness remains a challenge in the resin transfer moulding process simulation. We are interested in this work on developing an improved computational approach based on finite element method coupled with control volume approach. Simulations can predict the position of the front of resin flow, pressure and temperature distribution at each time step. Our optimization approach is first based on the modification of conventional control volume/finite element method, then on the adaptation of the iterative algorithm of conjugate gradient to Compressed Sparse Row (CSR) storage scheme. The approach has been validated by comparison with available results. The proposed method yielded smoother flow fronts and reduced the error in the pressure and temperature pattern that plagued the conventional fixed grid methods. The solution accuracy was considerably higher than that of the conventional method since we could proceed in the mesh refinement without a significant increase in the computation time. Various thermal engineering situations can be simulated by using the developed code.

Penetration of Aluminum Targets by Ogive-Nosed Projectiles at Oblique Angles

2013 ◽  
Vol 275-277 ◽  
pp. 746-750
Author(s):  
Yu Tao Hu ◽  
Fang Yun Lu ◽  
Bang Hai Jiang ◽  
Duo Zhang
Keyword(s):  
Finite Element ◽  
Free Surface ◽  
Spherical Cavity ◽  
Surface Effects ◽  
Cavity Expansion ◽  
Finite Element Code ◽  
Transient Dynamic ◽  
Dynamic Finite Element ◽  
Spherical Cavity Expansion ◽  
Good Agreement

.In this paper we present the results from a combined experimental, analytical, and computational penetration program. we use an explicit transient dynamic finite element code to model the projectile under an analytical forcing load representing the target. As angle of obliquity is increased free surface effects become significant, The analytical forcing load used here derived from the spherical cavity expansion approach with modifications to account for the free surface effects during oblique penetration. Results from the simulations show the trajectory of the projectile are in good agreement with experiments.

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