Comprehensive studies on hot compaction and vibration assisted compaction tests of aluminum powder

2020 ◽  
pp. 1-20 ◽  
Author(s):  
Qiang Zhou ◽  
Shutao Song ◽  
Quanfang Chen ◽  
Yuanli Bai
Keyword(s):  
Finite Element ◽  
Analytical Solution ◽  
Finite Element Model ◽  
Density Ratio ◽  
Element Model ◽  
Powder Compaction ◽  
Compression Pressure ◽  
Cold Compaction ◽  
Hot Compaction ◽  
Density Ratios

Abstract Aluminum powder compaction was studied using both test and simulation. Cold compaction, hot compaction and vibration assisted (cold) compaction tests were conducted to achieve different density ratios. Firstly, hot compaction test (at 300°C, compression pressure 140MPa) improved about 6% compared with cold compaction under the same compression pressure. Secondly, although the relative density ratio doesn’t obviously improve at vibration assisted (cold) compaction, the strength of the specimens made under vibration loading is much better than those of cold compaction. Additionally, finite element models with well calibrated Drucker Prager Cap (DPC) material constitutive model were built in Abaqus/standard to simulate the powder compaction process. The results of finite element model have very good correlations with test results up to the tested range, and this finite element model further predicts the loading conditions needed to achieve the higher density ratios. Two exponential equations of the predicted density ratio were obtained by combining the test data and the simulation results. A new analytical solution was developed to predict the axial pressure versus the density ratio for the powder compaction according to DPC material model. The results between the analytical solution and the simulation model have a very good match.

scholarly journals Effect of a rigid toroidal inhomogeneity on the elastic properties of a composite

2018 ◽  
Vol 24 (4) ◽  
pp. 1129-1146 ◽  
Author(s):  
Stanislav Krasnitskii ◽  
Anton Trofimov ◽  
Enrico Radi ◽  
Igor Sevestianov
Keyword(s):  
Finite Element ◽  
Analytical Solution ◽  
Finite Element Model ◽  
Elastic Medium ◽  
Elastic Properties ◽  
Element Model ◽  
Uniform Strain ◽  
Model Calculations ◽  
Torus Surface ◽  
Strain Components

An analytical solution is obtained for the problem of an infinite elastic medium containing a rigid toroidal inhomogeneity under remotely applied uniform strain. The traction on the torus surface is determined as a function of torus parameters and strain components applied at infinity. The results are utilized to calculate components of the stiffness contribution tensor of the rigid toroidal inhomogeneity that is required for calculation of the overall elastic properties of a material containing multiple toroidal inhomogeneities. The analytical results are verified by comparison with finite element model calculations.

Axial Strength of Tube-to-Tubesheet Joints: Finite Element and Experimental Evaluations

2001 ◽  
Vol 124 (1) ◽  
pp. 22-31 ◽  
Author(s):  
M. Allam ◽  
A. Bazergui
Keyword(s):  
Finite Element ◽  
Analytical Solution ◽  
Finite Element Model ◽  
Experimental Testing ◽  
Element Model ◽  
Axial Strength ◽  
Pull Out ◽  
Push Out ◽  
Pull Out Strength ◽  
The Finite Element Model

Because of their importance for the integrity of heat exchangers, the strength of tube-to-tubesheet joints, and particularly their axial strength, is of special interest. A finite element model of an expanded tube-to-tubesheet joint is proposed and examined experimentally with the objective of determining numerically its axial strength. Simplified analytical methods that were previously proposed by many authors to predict the joint axial strength are also used in this investigation. Experimental testing shows that the finite element model is highly accurate for calculating the joint axial strength. The experimental investigation also proves that the pull-out strength is overestimated when calculated using a simple analytical solution. A parametric analysis using the finite element results indicates that the pull-out force is normally lower than the push-out load and that both are lower than the estimations of the analytical solution. The results indicate that the pull-out force as given by the finite element model is generally 35 percent lower than that evaluated by the analytical solution. A difference of as much as 10 percent is also found between the push-out and pull-out loads.

A Simple Finite Element Coupled Model for the Stress Analysis of Rotating Parts

2006 ◽  
Author(s):  
Joseph J. Rencis ◽  
Dinesh Immaneni
Keyword(s):  
Finite Element ◽  
Analytical Solution ◽  
Finite Element Model ◽  
Stress Analysis ◽  
Coupled Model ◽  
Element Model ◽  
Axial Line ◽  
Coupled Line ◽  
Line Elements

A new coupled line finite element model is proposed that can be used to carry out a stress analysis of rotating parts. The rotating part consists of a disk modeled with axisymmetric line elements and blades modeled with axial line elements. An example is presented to demonstrate the accuracy of the proposed technique. The coupled finite element model is compared with a newly developed analytical solution and a solid finite element model.

Finite Element Simulation of Tire-Rim Interface

1989 ◽  
Vol 17 (4) ◽  
pp. 305-325 ◽  
Author(s):  
N. T. Tseng ◽  
R. G. Pelle ◽  
J. P. Chang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Finite Element Simulation ◽  
Contact Pressure ◽  
Element Model ◽  
Experimental Measurements ◽  
Inflation Pressure ◽  
Interference Fit ◽  
Element Simulation ◽  
Rubber Composite

Abstract A finite element model was developed to simulate the tire-rim interface. Elastomers were modeled by nonlinear incompressible elements, whereas plies were simulated by cord-rubber composite elements. Gap elements were used to simulate the opening between tire and rim at zero inflation pressure. This opening closed when the inflation pressure was increased gradually. The predicted distribution of contact pressure at the tire-rim interface agreed very well with the available experimental measurements. Several variations of the tire-rim interference fit were analyzed.

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