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Showing papers in "International Journal of Materials and Structural Integrity in 2019"


Journal ArticleDOI
TL;DR: In this article, the authors used higher order Hermite interpolation functions for contact surface enrichment of contact finite elements and obtained a stable solution at a relatively coarser mesh than the fully Lagrangian discretised finite element mesh.
Abstract: It is known that during the simulation of the adhesive contact problems highly nonlinear responses of interaction forces occur within the very narrow adhesive zone. It leads to the loss of quadratic-rate of convergence during Newton-Raphson iterations and unstable computational behaviour. In case of standard finite element formulation, a very fine mesh resolution is needed for the stable computations, but a significant computational cost is associated. For minimising the cost without the loss of accuracy of the solution, contact surface enrichment approaches have been presented. These approaches utilise the higher-order Lagrangian polynomial functions for the enrichment of contact finite elements. In the present work, based on the incorporation of fifth- and seventh-order Hermite interpolation functions two new enriched contact finite elements are formulated. The performance of proposed enriched contact finite elements is demonstrated through the simulation of peeling of an initially flat deformable strip from a rigid substrate. A stable solution is obtained at a relatively coarser mesh than the fully Lagrangian discretised finite element mesh. It is shown that the proposed higher order Hermite enriched contact finite elements attain better performance when compared with earlier introduced enriched elements.

3 citations


Journal ArticleDOI
TL;DR: In this paper, the displacement-based computationally efficient volumetric locking-free 3D finite element using smoothening of determinant of deformation gradient (J-Bar method) within the framework of isotropic hyperelasticity was developed.
Abstract: Volumetric locking is exhibited by nearly incompressible solids such as rubber, resulting in over-stiffening response of the finite element mesh. In this work, we developed the displacement-based computationally efficient volumetric locking-free 3D finite element using smoothening of determinant of deformation gradient (J-Bar method) within the framework of isotropic hyperelasticity. The developed methodology is employed to analyse a rubber block undergoing finite stretch and bending deformations. The convergence study for finite stretch and bending of rubber block is presented. Results of the analysis show that J-Bar method efficiently removes the volumetric locking.

2 citations


Journal ArticleDOI
TL;DR: The modelling and characterisation of a magneto-rheological elastomer isolator device (MREID) under impact loading using the adaptive neuro-fuzzy inference system (ANFIS) technique and the proposed interpolated multiple ANFIS model predicted the behaviour of the MREID with a high level of accuracy.
Abstract: This paper presents the modelling and characterisation of a magneto-rheological elastomer isolator device (MREID) under impact loading using the adaptive neuro-fuzzy inference system (ANFIS) technique. The characterisation of an MREID under impact loading was performed using an impact pendulum test rig, and the data obtained from the experimental work was processed in form of force-velocity and force-displacement characteristics. In order to predict MREID behaviour in simulation analysis, multiple ANFIS models were proposed. A single ANFIS model represented a single kinetic energy produced by the impact mass used in experimental work. The experimental data was then used to train the ANFIS in predicting MREID behaviour and validating its performance. For verification, the prediction model, a parametric model (namely, the modified Bouc-Wen model) was developed, and the models were compared. The proposed interpolated multiple ANFIS model predicted the behaviour of the MREID with a high level of accuracy. The proposed model produced a better prediction than the modified Bouc-Wen model.

2 citations


Journal ArticleDOI
TL;DR: In this paper, the authors studied the leak characteristics of a representative elastomeric selforganizer and showed that the leak properties of the selto-polygonal SE are similar to those of a conventional SE.
Abstract: Elastomeric seals are devices that are widely used to prevent fluid leakage through the interface of mating parts. In this paper, we study the leak characteristics of a representative elastomeric s...

2 citations


Journal ArticleDOI
TL;DR: A comparative study of effect of high temperature on fly ash-based concrete, activated with sodium-based activators and ordinary Portland cement concrete for same grade is presented in this article.
Abstract: Sustainability and durability of concrete structures is an issue in today's world. This paper presents comparative study of effect of high temperature on fly ash-based alkali activated concrete, activated with sodium-based activators and ordinary Portland cement concrete for same grade. Residual compressive strength, split tensile strength, flexural strength, bond strength and modulus of elasticity were evaluated for both concretes at temperatures of 27°C, 500°C, 700°C and 900°C. It was found that alkali activated concrete with fly ash had 16% reduction in compressive strength as compared to 40% reduction in ordinary cement concrete. Similarly reduction in other mechanical properties like split tensile strength, flexural strength, bond strength and modulus of elasticity for fly ash-based alkali activated concrete was less compared to ordinary Portland cement concrete. This indicates that alkali activated concrete can be a viable alternative to ordinary Portland cement concrete during its exposure to high temperature. The highlights of the paper are: 1) mechanical properties of fly ash-based alkali activated concrete at elevated temperatures were evaluated; 2) effect of high temperature on fly ash-based alkali activated concrete and OPC concrete was compared and fly ash-based alkali activated concrete was found to be superior to ordinary cement concrete in all mechanical properties.

1 citations


Journal ArticleDOI
TL;DR: In this article, the results of cyclic electromechanical experiments conducted on uniaxially stretched poly(vinylidene fluoride) (PVDF) films were carried out over a range of applied displacement amplitude, superposed on an initial stretch on the test samples.
Abstract: In this study, we present the results of cyclic electromechanical experiments conducted on uniaxially stretched poly(vinylidene fluoride) (PVDF) films. The experiments were carried out over a range of applied displacement amplitude ranging from 0.5 mm to 1.5 mm, superposed on an initial stretch on the test samples. The strains were calculated using non-contact speckle monitoring method. The hysteresis plots of mechanical and electromechanical cyclic responses are presented. Stress relaxation was observed up to 70% in orthogonal to stretch direction and 16% in the stretch direction. Observed piezoelectricity along both the directions is reported and discussed in the paper.

1 citations


Journal ArticleDOI
TL;DR: In this article, the authors used FEA simulations with Gurson-Tvergaard-Needleman (GTN) damage model to study the deformation of a 316LN stainless steel weld joint.
Abstract: Ductile crack growth in austenitic 316LN stainless steel weld joint has been studied using FEA simulations with Gurson-Tvergaard-Needleman (GTN) damage model. The material specific GTN damage param...