Finite element modelling materials

I liis simulation provides the quantitative measures required for evaluation of the extent of deviation from a perfect viscometric flow. Specifically, the finite element model results can be used to calculate the torque corresponding to a given set of experimentally determined material parameters as... 

Support for this work by 3M Company and permission to publish is gratefully acknowledged. We thank Dave Lindemann for the finite-element modeling and 3M s Division Engineering, especially Don Peacock, for all their work. Bob Maline of 3M s Specialty Materials Division was supervisor of pilot plant operations. 

Perhaps a more severe comparison of model response is the time history of the centerline temperature. These values reflect the interaction of several phenomena the reaction itself, the heat liberated by the reaction, the heat storage capacity of the material, and the rate at which heat can be carried away from the centerline region by conduction. Figure 8 shows the temperatures predicted by the Chiao and finite element models, as well as the imposed autoclave temperature history. It also includes five thermocouple readings which were reported in Chiao s manuscript (8). 

Guo, Y., Tang, J., Dornfield, D. (1998). A finite element model for wafer material removal rate and non-uniformity in chemical mechanical polishing process. Proc. 3rd Int. CMP for ULSI Multilevel Interconnect. Conf, Santa Clara, pp. 113-118. 

A single screw extruder was used to fabricate the filaments from the composite. The glass transition of the composite was found to be 126°C, which is higher than that of pure ABS material. In addition, the melt flow behavior was extensively studied by setting up a finite element model (79). 

Maire, E., Fazekas, A., Salvo, L., Dendievel, R., Youssef, S., Cloetens, P., and Letang, J.M. 2003. X-ray tomography applied to the characterization of cellular materials. Related finite element modeling problems. Components Sci. Technol. 63, 2431-2443. 

Abstract A general theoretical and finite element model (FEM) for soft tissue structures is described including arbitrary constitutive laws based upon a continuum view of the material as a mixture or porous medium saturated by an incompressible fluid and containing charged mobile species. Example problems demonstrate coupled electro-mechano-chemical transport and deformations in FEMs of layered materials subjected to mechanical, electrical and chemical loading while undergoing small or large strains. 

The development of biomechanical models derived from continuum formulations for transport of water and charged species in porous media has been carried out for various soft tissues [1-3] and implemented using finite element models (FEMs) [4-8], Such models provide quantitative views of the response of these complex structures that is especially useful in the study of orthopedic, vascular, ocular, and soft tissue substitutes developed by tissue engineering. In this paper a formulation and FEM are described that incorporate and extend these works in a very general model that identifies physical material properties and allows transient analyses of both natural and artificial soft tissue structures. 

Simon, B.R., Kaufmann, M.V., Liu, J., and Baldwin, A.L. (1998) Porohyperelastic-transport-swelling theory, material properties, and finite element models for large arteries. International Journal of Solids and Structures 35, 5021-5031... 

The accuracy of the test procedure was validated by room temperature testings of two to three fracture specimens of each material. Additional load data, which were obtained through the bottom load transducer, were used to check the accuracy of the finite element modeling of the load train. A KRAKf gauge at the remaining ligament of the prenotched bar was used to check the master curve which related the crack extension history with the COD data at room temperature. Details of this validation analysis are described in Ref. 57. 

K.-D. Debschiitz, R. Danzer, and G. Petzow, Finite Element Modeling of Ceramic Materials with a Viscous Grain Boundary Phase, in Ceramics Today—Tomorrow s Ceramics, ed., P. Vincenzini, Elsevier Science Publishers B.V., Amsterdam, The Netherlands, 1991, pp. 727-736. 

From the perspective of the present discussion, our key objective is to uncover the detailed crystallographic underpinnings of single crystal plasticity. From the standpoint of a finite element model of such plasticity, what distinguishes the kinematic treatment of fee A1 from that of hep Zn In a word, the primary distinction is the presence of different slip systems in these different materials. The notion of a slip system refers to a partnership between two directions, the slip plane normal and the slip direction. 

The Spherical-Material Model. The finite-element model used for the spherical-material model is a single rubber sphere surrounded by an annulus of epoxy resin. The complete cell can be represented by axisymmetric elements in an analogous manner to the cylindrical model, as shown in Figure 2. The same number and types of elements were used for this model. Analyses were also undertaken assuming a hole instead of the rubber particle the grid then consisted of the epoxy annulus alone. 

In view of these difficulties, we have taken the second of the options just discussed. Namely, we assume that the particles have cavitated, which is in agreement with experimental observations, and then we base our finite-element modeling studies on examining an already voided epoxy matrix. This approach avoids the necessity of defining the value of the bulk modulus of the rubber with a high degree of accuracy (see the section Material Properties,). 

Numerical simulation of the cold spray process was reported by Ghelichi et al. (2011) using a 3D-finite element model to calculate the critical velocity. The results obtained from the software are converted to Wavelet parameters allowing to calculate the second derivative of the physical parameters in Sobolev space. The authors concluded that their approach is a useful tool to improve the experimental setup as well as the sensitivity and accuracy of the described method. It may help to survey the cold spray process and its qualification with the aim to increase the properties and performance of the coating material deposited under optimum conditions (see also Jodoin, Raletz and Vardelle, 2006). 

The geometric configuration shown in Figure 1 was discretised into 1876 isoparametric solid elements joined by 5093 nodes. Three material types are represented in the finite element model ... 

Pure Spot FSW. Awang et al. (Ref 23) presented some results on finite element modeling of FSSW using ABAQUS/Explicit (ABAQUS, Inc.) as a finite element solver. A three-dimensional (3-D) coupled thermal-stress model was used to calculate the thermomechanical response of the FSSW process. Adaptive meshing and advection schemes, which make it possible to maintain mesh quality under large deformations, were used to simulate the material flow and temperature distribution in the FSSW process. 

For an example of finite element modeling of fluxes in proton-containing materials, see Ref. [21]. 

Matthews FL, Davies GAO, Hitchings D, Soutis C. Finite element modelling of composite materials and structures. Woodhead Publishing Ltd 2000. 

Bedogni E, Ivanov DS, Lomov SV, Pirondi A, Vettori M, Verpoest I. Creating finite element model of 3D woven fabrics and composites semi-authomated solution of interpenetration problem. In 15th European conference on composite materials (ECCM-15) 2012. Venice, p. electronic edition, s.p. 

To measure load distribution, standard aerospace bolts were fitted with strain gauges. Both shear and axial load could be measured. A three-dimensional finite element model with linear elastic material properties was developed for calculation of load distribution prior to initiation of material failure and comparison with instm-mented bolt results. Model details are similar to those of the single-bolt model above, with a full contact analysis being performed for all bolts, washers and holes. 

Finite element modelling of composite materials and structures... 

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