Journal articles: 'C0 formulation'

1

Wells, Garth N., and Nguyen Tien Dung. "A C0 discontinuous Galerkin formulation for Kirchhoff plates." Computer Methods in Applied Mechanics and Engineering 196, no. 35-36 (July 2007): 3370–80. http://dx.doi.org/10.1016/j.cma.2007.03.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Liu, Zhenqi, Alison B. Lansley, Tu Ngoc Duong, John D. Smart, and Ananth S. Pannala. "Increasing Cellular Uptake and Permeation of Curcumin Using a Novel Polymer-Surfactant Formulation." Biomolecules 12, no. 12 (November 23, 2022): 1739. http://dx.doi.org/10.3390/biom12121739.

Full text

Abstract:

Several therapeutically active molecules are poorly water-soluble, thereby creating a challenge for pharmaceutical scientists to develop an active solution for their oral drug delivery. This study aimed to investigate the potential for novel polymer-surfactant-based formulations (designated A and B) to improve the solubility and permeability of curcumin. A solubility study and characterization studies (FTIR, DSC and XRD) were conducted for the various formulations. The cytotoxicity of formulations and commercial comparators was tested via MTT and LDH assays, and their permeability by in vitro drug transport and cellular drug uptake was established using the Caco-2 cell model. The apparent permeability coefficients (Papp) are considered a good indicator of drug permeation. However, it can be argued that the magnitude of Papp, when used to reflect the permeability of the cells to the drug, can be influenced by the initial drug concentration (C0) in the donor chamber. Therefore, Papp (suspension) and Papp (solution) were calculated based on the different values of C0. It was clear that Papp (solution) can more accurately reflect drug permeation than Papp (suspension). Formulation A, containing Soluplus® and vitamin E TPGs, significantly increased the permeation and cellular uptake of curcumin compared to other samples, which is believed to be related to the increased aqueous solubility of the drug in this formulation.

APA, Harvard, Vancouver, ISO, and other styles

3

Saleeb, A. F., and T. Y. Chang. "On the hybrid-mixed formulation of C0 curved beam elements." Computer Methods in Applied Mechanics and Engineering 60, no. 1 (January 1987): 95–121. http://dx.doi.org/10.1016/0045-7825(87)90131-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Nguyen-Quoc, T., S. Nguyen-Hoai, and D. Mai-Duc. "An Edge-Based Smoothed Discrete Shear Gap Method for Static and Free Vibration Analyses of FG-CNTRC Plates." International Journal of Computational Methods 16, no. 04 (May 13, 2019): 1850102. http://dx.doi.org/10.1142/s0219876218501025.

Full text

Abstract:

In this paper, an edge-based smoothed stabilized discrete shear gap method (ES-DSG) is integrated with the C0-type high-order shear deformation plate theory (C0-HSDT) for free vibration and static analyses of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) plates. The material properties of FG-CNTRC are assumed to be graded through the thickness direction according to several distributions of the volume fraction of carbon nanotubes (CNTs). The stiffness formulation of the ES-DSG based on C0-HSDT is performed by using the strain smoothing technique over the smoothing domains associated with edges of elements. This hence does not require shear correction factors. The accuracy and reliability of the proposed method are confirmed in several numerical examples.

APA, Harvard, Vancouver, ISO, and other styles

5

Briassoulis, D. "Thin element applications of a new formulation for C0 structural elements." Computers & Structures 37, no. 6 (January 1990): 1097–103. http://dx.doi.org/10.1016/0045-7949(90)90021-s.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Kumar, Ajay, Pradeep Bhargava, and Anupam Chakrabarti. "Natural Frequencies and Mode Shapes of Laminated Composite Skew Hypar Shells with Complicated Boundary Conditions Using Finite Element Method." Advanced Materials Research 585 (November 2012): 44–48. http://dx.doi.org/10.4028/www.scientific.net/amr.585.44.

Full text

Abstract:

In the present investigation, free vibration behaviour is studied for the laminated composite skew hypar shells having twist radius of curvature. A higher-order shear deformation theory is employed in the C0 finite element formulation. Higher-order terms in the Taylor’s series expansion are used to represent the higher-order transverse cross sectional deformation modes. The formulation includes Sanders’ approximation for doubly curved shells considering the effect of transverse shear. The structural system is considered to be undamped. The correctness of the formulation is established by comparing the present results of problems with those available in the published literature. The effects of different parameters are studied on the free vibration aspects of laminated composite skew hypar shells. Effect of cross curvature is included in the formulation. The C0 finite element formulation has been done quite efficiently to overcome the problem of C1 continuity associated with the HSDT. The isoparametric FE used in the present model consists of nine nodes with seven nodal unknowns per node. Since there is no result available in the literature based on HSDT on the problem of free vibration of laminated composite skew hypar shells, new results are presented by varying geometry, boundary conditions, ply orientations and skew angles which will serve as benchmark for future researchers.

APA, Harvard, Vancouver, ISO, and other styles

7

Yu, Kai-Ming, Yu Wang, and Charlie C. L. Wang. "Smooth geometry generation in additive manufacturing file format: problem study and new formulation." Rapid Prototyping Journal 23, no. 1 (January 16, 2017): 34–43. http://dx.doi.org/10.1108/rpj-06-2015-0067.

Full text

Abstract:

Purpose In the newly released ASTM standard specification for additive manufacturing file (AMF) format – version 1.1 – Hermite curve-based interpolation is used to refine input triangles to generate denser mesh with smoother geometry. This paper aims to study the problems of constructing smooth geometry based on Hermite interpolation on curves and proposes a solution to overcome these problems. Design/methodology/approach A formulation using triangular Bézier patch is proposed to generate smooth geometry from input polygonal models. Different configurations on the boundary curves in the formulation are analyzed to further enrich this formulation. Findings The study shows that the formulation given in the AMF format (version 1.1) can lead to the problems of inconsistent normals and undefined end-tangents. Research limitations/implications The scheme has requirements on the input normals of a model, only C0 interpolation can be generated on those cases with less-proper input. Originality/value To overcome the problems of smooth geometry generation in the AMF format, the authors propose an enriched scheme for computing smooth geometry by using triangular Bézier patch. For the configurations with less-proper input, the authors adopt the Boolean sum and the Nielson’s point-opposite edge interpolation for triangular Coons patch to generate the smooth geometry as a C0 interpolant.

APA, Harvard, Vancouver, ISO, and other styles

8

Martini, L., and R. Vitaliani. "On the polynomial convergent formulation of a C0 isoparametric skew beam element." Computers & Structures 29, no. 3 (January 1988): 437–49. http://dx.doi.org/10.1016/0045-7949(88)90396-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Briassoulis, D. "The four-node C0 Mindlin plate bending element reformulated, Part I: Formulation." Computer Methods in Applied Mechanics and Engineering 107, no. 1-2 (August 1993): 23–43. http://dx.doi.org/10.1016/0045-7825(93)90167-v.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Singh, S. K., and A. Chakrabarti. "Static, Vibration and Buckling Analysis of Skew Composite and Sandwich Plates Under Thermo Mechanical Loading." International Journal of Applied Mechanics and Engineering 18, no. 3 (August 1, 2013): 887–98. http://dx.doi.org/10.2478/ijame-2013-0053.

Full text

Abstract:

Abstract Static, vibration and buckling behavior of laminated composite and sandwich skew plates is studied using an efficient C0 FE model developed based on refined higher order zigzag theory. The C0 FE model satisfies the interlaminar shear stress continuity at the interfaces and zero transverse shear stress conditions at plate top and bottom. In this model, the first derivatives of transverse displacement have been treated as independent variables to overcome the problem of C1 continuity associated with the plate theory. The C0 continuity of the present element is compensated in the stiffness matrix formulation by adding a suitable term. In order to avoid stress oscillations observed in the displacement based finite element, the stress field derived from temperature is made consistent with the total strain field by using field consistent approach. Numerical results are presented for different static, vibration and buckling problems by applying the FE model under thermo mechanical loading, where a nine noded C0 continuous isoparametric element is used. It is observed that there are very few results available in the literature on laminated composite and sandwich skew plates based on refined theories. As such many new results are also generated for future reference

APA, Harvard, Vancouver, ISO, and other styles

11

Nayak, A. K., R. A. Shenoi, and S. S. J. Moy. "Analysis of damped composite sandwich plates using plate bending elements with substitute shear strain fields based on Reddy's higher-order theory." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 216, no. 5 (May 1, 2002): 591–606. http://dx.doi.org/10.1243/0954406021525377.

Full text

Abstract:

Two new C0 assumed strain finite element formulations of Reddy's higher-order theory are used to determine the natural frequencies and loss factors of layered anisotropic composite and sandwich plates. Material properties typical of fibre polyester resins for the skin and HEREX C70 PVC foam damping materials for cores are used to show the parametric effects of plate aspect ratio, length-thickness ratio on natural frequencies and loss factors. A consistent mass matrix is adopted in the present formulation. Both frequency-independent and frequency-dependent damping of viscoelastic materials are considered. The developed elements are free from spurious zero energy modes due to the assumed strain approach.

APA, Harvard, Vancouver, ISO, and other styles

12

Raky BA, Aissatou, Toffène DIOME, Cheikh Abdou Khadre Mbacké DIA, and Mbacké SEMBENE. "USE OF PLANT BIOCIDAL SUBSTANCES BASED ON CRATAEVA RELIGIOSA AGAINST TUTA ABSOLUTA (LEPIDOPTERA: GELICHIIDAE) DEVASTATOR OF TOMATO CROPS." International Journal of Engineering Technologies and Management Research 6, no. 8 (March 31, 2020): 63–71. http://dx.doi.org/10.29121/ijetmr.v6.i8.2019.442.

Full text

Abstract:

The tomato leaf miner, Tutaabsoluta causes serious losses in production. It can feed on all the green parts of the tomato and can cause up to 100% damage if not controlled. Presently, the most effective method of pest control is the use of chemicals. The purpose of this study is to give alternative solutions based on natural products. The objective was to know the biocidal power of the aqueous extracts of Crataevareligiosa leaves on T. absoluta. The work was conducted on a field at the Niayes area. Three formulations were used: formulation with dry leaves (200g/l, 150g/l and 100g/l), formulation with fresh leaves (200g/l) and soapy formulation (100g Crataeva + 25g soapy) and two controls (C0, S). Each treatment was repeated twice as well as the controls. The results showed a significant decrease (P <0.0001) of the larvae compared to the blank control. However, the fresh formulation (200g/l) had double effect by reducing the number of pest larvae and a positive effect on number of the predator N. tenuis in addition to a positive impact on the agronomic traits. The dry formulation, which certainly reduced the T. absoluta larvae, had no impact on N. tenuis and H. armigera.

APA, Harvard, Vancouver, ISO, and other styles

13

Decloedt, Eric H., Helen McIlleron, Peter Smith, Concepta Merry, Catherine Orrell, and Gary Maartens. "Pharmacokinetics of Lopinavir in HIV-Infected Adults Receiving Rifampin with Adjusted Doses of Lopinavir-Ritonavir Tablets." Antimicrobial Agents and Chemotherapy 55, no. 7 (May 2, 2011): 3195–200. http://dx.doi.org/10.1128/aac.01598-10.

Full text

Abstract:

ABSTRACTRifampin coadministration dramatically reduces plasma lopinavir (LPV) concentrations. In healthy volunteers, doubling the dose of a lopinavir-ritonavir (LPV/r) capsule formulation overcame this interaction, but a subsequent study of double doses of the tablet formulation was stopped early owing to hepatotoxicity. However, healthy-volunteer study findings may not apply to HIV-infected adults. We evaluated the steady-state pharmacokinetics of LPV in HIV-infected adults virologically suppressed on an LPV/r regimen who were given rifampin, and the dose of the LPV/r tablet formulation was gradually increased. The steady-state pharmacokinetics of LPV/r were evaluated at baseline, a week after commencing rifampin, a week after the LPV/r dose was increased 1.5 times, and a week after the LPV/r dose was doubled. Twenty-one participants were enrolled. The median [interquartile range (IQR)] predose LPV concentrations (C0) were 8.1 (6.2 to 9.8) mg/liter at baseline, 1.7 (0.3 to 3.0) mg/liter after 7 days of rifampin, 5.9 (2.1 to 9.9) mg/liter with 1.5 times the dose of LPV/r, and 10.8 (7.0 to 13.1) mg/liter with double-dose LPV/r. There were no significant differences in the LPV area under the plasma concentration-time curve from 0 to 12 h (AUC0-12),C0,C12, maximum concentration of drug in serum (Cmax), or half-life (t1/2) between the baseline and double-dose LPV/r time points. Treatment was generally well tolerated, with two participants developing asymptomatic grade 3/4 transaminitis. Doubling the dose of the tablet formulation of LPV/r overcomes induction by rifampin. Less hepatotoxicity occurred in our cohort of HIV-infected participants than was reported in healthy-volunteer studies.

APA, Harvard, Vancouver, ISO, and other styles

14

Gmu¨r, T. C., and J. D. Rodrigues. "Shaft Finite Elements for Rotor Dynamics Analysis." Journal of Vibration and Acoustics 113, no. 4 (October 1, 1991): 482–93. http://dx.doi.org/10.1115/1.2930212.

Full text

Abstract:

This paper presents efficient C0-compatible finite elements for the modelling of rotor-bearing systems. The proposed linearly tapered elements, which have a variable number of nodal points, are simple and attractive from a cost viewpoint. They include the effects of translational and rotatory inertia, gyroscopic moments, internal viscous and hysteretic damping, shear deformations, and mass eccentricity. Developed from the weak formulation associated with the differential equations governing the transverse dynamic behavior of rotors, these elements show a convergence pattern similar to the one obtained with conventional C1-compatible shaft elements. Numerical examples are provided, which compare the proposed approach to the C1-formulation or to previously published results.

APA, Harvard, Vancouver, ISO, and other styles

15

Cotoni, Vincent, Patrice Masson, and François Cĉté. "A Finite Element for Piezoelectric Multilayered Plates: Combined Higher-order and Piecewise Linear C0 Formulation." Journal of Intelligent Material Systems and Structures 17, no. 2 (February 2006): 155–66. http://dx.doi.org/10.1177/1045389x06056501.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Zhen, Wu, and Lin Kun. "Efficient C0 Finite Element Formulation for Thermal Stress Analysis of Laminated Composite and Sandwich Plates." Journal of Aerospace Engineering 28, no. 4 (July 2015): 04014113. http://dx.doi.org/10.1061/(asce)as.1943-5525.0000450.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Laurent, H., and G. Rio. "Formulation of a thin shell finite element with continuity C0 and convected material frame notion." Computational Mechanics 27, no. 3 (March 28, 2001): 218–32. http://dx.doi.org/10.1007/s004660100243.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Dvořáková, Edita, and Bořek Patzák. "ON EVALUATION OF THE THREE-DIMENSIONAL ISOGEOMETRIC BEAM ELEMENT." Acta Polytechnica CTU Proceedings 26 (March 17, 2020): 24–29. http://dx.doi.org/10.14311/app.2020.26.0024.

Full text

Abstract:

The exact description of the arbitrarily curved geometries, including conic sections, is an undeniable advantage of isogeometric analysis (IGA) over standard finite element method (FEM). With B-spline/NURBS approximation functions used for both geometry and unknown approximations, IGA is able to exactly describe beams of various shapes and thus eliminate the geometry approximation errors. Moreover, naturally higher continuity than standard C0 can be provided along the entire computational domain. This paper evaluates the performance of the nonlinear spatial Bernoulli beam adapted from formulation of Bauer et al. [1]. The element formulation is presented and the comparison with standard FEM straight beam element and fully three-dimensional analysis is provided. Although the element is capable of geometrically nonlinear analysis, only geometrically linear cases are evaluated for the purposes of this study.

APA, Harvard, Vancouver, ISO, and other styles

19

Anish, Ajay Kumar, and Anupam Chakrabarti. "Influence of openings and additional mass on vibration of laminated sandwich rhombic plates using IHSDT." Journal of Thermoplastic Composite Materials 33, no. 1 (October 11, 2018): 3–34. http://dx.doi.org/10.1177/0892705718785682.

Full text

Abstract:

In this article, investigations on the influence of openings and additional mass on free vibration analysis of laminated composite sandwich skew plates using improved higher order shear deformation theory (IHSDT) have been done. The IHSDT model satisfies the interlaminar shear stress continuity at the layer interfaces and also ensures zero transverse shear stress conditions at the top and bottom of the plate. The piecewise parabolic shear stress variation across the thickness of each layer is considered. No shear correction factors are required. The 2-D C0 finite element (FE) model has been developed by authors based on IHSDT. FE model based on IHSDT has been coded in FORTRAN. The problem of C1 continuity requirement associated with the IHSDT is overcome using an appropriate C0 FE formulation. The free vibration frequencies of laminated composite and sandwich plates obtained using the present 2-D FE model are in good agreement with the 3-D elasticity results. The influence of the side-to-thickness ratio, skew angles, boundary conditions, and mode shapes is taken into consideration for the present study.

APA, Harvard, Vancouver, ISO, and other styles

20

Kutlu, Akif. "Mixed finite element formulation for bending of laminated beams using the refined zigzag theory." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 235, no. 7 (July 2021): 1712–22. http://dx.doi.org/10.1177/14644207211018839.

Full text

Abstract:

This study presents a mixed finite element formulation for the stress analysis of laminated composite beams based on the refined zigzag theory. The Hellinger–Reissner variational principle is employed to obtain the first variation of the functional that is expressed in terms of displacements and stress resultants. Due to C0 continuity requirements of the formulation, linear shape functions are adopted to discretize the straight beam domain with two-noded finite elements. The proposed formulation is shear locking free from nature since it introduces displacement and stress resultant terms as independent field variables. A monolithic solution of the global finite element equations is preferred, hence the stress resultants are directly obtained from the solution of these equations. The in-plane strain measures of the beam are obtained directly at the nodes over the compliance matrix and stress resultants by avoiding error-prone spatial derivatives. Following, transverse shear stresses are calculated from the equilibrium equations at the post-processing level. This simple but effective finite element formulation is first verified and tested for convergence behavior. The robustness of the approach is shown through some examples and its accuracy in predicting the displacement and stress components is revealed.

APA, Harvard, Vancouver, ISO, and other styles

21

LESIČAR, TOMISLAV, ZDENKO TONKOVIĆ, and JURICA SORIĆ. "C1 CONTINUITY FINITE ELEMENT FORMULATION IN SECOND-ORDER COMPUTATIONAL HOMOGENIZATION SCHEME." Journal of Multiscale Modelling 04, no. 04 (December 2012): 1250013. http://dx.doi.org/10.1142/s1756973712500138.

Full text

Abstract:

The paper describes a second-order two-scale computational homogenization procedure for modeling of heterogeneous materials at small strains. The Aifantis theory of linear elasticity has been described and implemented into the two dimensional C1 continuity triangular finite element formulation. The element has been verified on several patch tests and the computational efficiency of numerical integration of the element stiffness matrix has been tested as well. Furthermore, the C1 two dimensional triangular finite element based on full second gradient continuum is formulated and used for the macrolevel discretization in the frame of a multiscale scheme, where the RVE is discretized by the C0 quadrilateral finite element. The application of generalized periodic boundary conditions and the microfluctuation integral condition on RVE has been investigated. The presented numerical algorithms have been implemented into FE software ABAQUS via user subroutines and verified on a pure bending problem. The comparability of RVE size to the length scale parameter of gradient elasticity has been proved, and elastoplastic behavior of heterogeneous material has been also considered. The results obtained show good numerical efficiency of the proposed algorithms.

APA, Harvard, Vancouver, ISO, and other styles

22

Lieu, Nguyen Thi Bich, and Nguyen Xuan Hung. "Static analysis of piezoelectric functionally graded porous plates reinforced by graphene platelets." Journal of Science and Technology in Civil Engineering (STCE) - NUCE 13, no. 3 (August 31, 2019): 58–72. http://dx.doi.org/10.31814/stce.nuce2019-13(3)-06.

Full text

Abstract:

In this study, for the first time an isogeometric finite element formulation for bending analysis of functionally graded porous (FGP) plates reinforced by graphene platelets (GPLs) embedded in piezoelectric layers is presented. It is named as PFGP-GPLs for a short. The plates are constituted by a core layer, which contains the internal pores and GPLs dispersed in the metal matrix either uniformly or non-uniformly according to three different patterns, and two piezoelectric layers perfectly bonded on the top and bottom surfaces of host plate. The modified Halpin–Tsai micromechanical model is used to estimate the effective mechanical properties which vary continuously along thickness direction of the core layer. In addition, the electric potential is assumed to vary linearly through the thickness for each piezoelectric sublayer. A generalized C0-type higher-order shear deformation theory (C0-HSDT) in association with isogeometric analysis (IGA) is investigated. The effects of weight fractions and dispersion patterns of GPLs, the coefficient and distribution types of porosity as well as external electrical voltages on structure’s behaviors are investigated through several numerical examples. Keywords: piezoelectric materials; FG-porous plate; graphene platelet reinforcements; isogeometric analysis.

APA, Harvard, Vancouver, ISO, and other styles

23

Iurlaro, L., M. Gherlone, and M. Di Sciuva. "The (3,2)-Mixed Refined Zigzag Theory for generally laminated beams: Theoretical development and C0 finite element formulation." International Journal of Solids and Structures 73-74 (November 2015): 1–19. http://dx.doi.org/10.1016/j.ijsolstr.2015.07.028.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Pandey, Shashank, and S. Pradyumna. "A new C0 higher-order layerwise finite element formulation for the analysis of laminated and sandwich plates." Composite Structures 131 (November 2015): 1–16. http://dx.doi.org/10.1016/j.compstruct.2015.04.034.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Campbell, John S., and Bernice Horgan. "A curved triangular plate bending element for Kirchhoff plates using a C0 coharmonic mixed two-field formulation." Communications in Applied Numerical Methods 6, no. 5 (July 1990): 351–58. http://dx.doi.org/10.1002/cnm.1630060504.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Domenico, Dario De, and Harm Askes. "A new multi-scale dispersive gradient elasticity model with micro-inertia: Formulation and C0-finite element implementation." International Journal for Numerical Methods in Engineering 108, no. 5 (February 22, 2016): 485–512. http://dx.doi.org/10.1002/nme.5222.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Belkaid, Khmissi, Nadir Boutasseta, Hamza Aouaichia, Djamel Eddine Gaagaia, Adel Deliou, and Badreddine Boubir. "A Simple and Efficient eight node Finite Element for Multilayer Sandwich Composite Plates Bending Behavior Analysis." Frattura ed Integrità Strutturale 16, no. 61 (June 19, 2022): 372–93. http://dx.doi.org/10.3221/igf-esis.61.25.

Full text

Abstract:

In this paper, a C0 simple and efficient isoparametric eight-node displacement-model based on higher order shear deformation theory is proposed for the bending behavior study of multilayer composites sandwich plates. Difficult C1-continuity requirement is overcome by extracting the seven degrees of freedom from strain relations for each element node: two displacements for in-plane behavior and five bending unknowns namely: a transverse displacement, two rotations and two shear angles, which results in a kinematic approximation formulation having only first order derivative requirement. The governing equations of the element (constitutive, virtual work and equilibrium equations) are implemented for the prediction of approximate solutions of deflections and stresses of sandwich plates linear elastic problems. Thereby, the formulation element is able to present a cubic in-plane displacement along both core and faces sandwich thickness, as well as, the shear stresses are found to vary as quadratic field without requiring shear correction factors and independent from any transverse shear locking problems. The accuracy and validity of the proposed formulation is verified through the numerical evaluation of displacements and stresses and their comparison with the available analytical 3D elasticity solutions and other published finite element results.

APA, Harvard, Vancouver, ISO, and other styles

28

LAL, ACHCHHE, B. N. SINGH, and SUSHIL KALE. "STOCHASTIC THERMAL POST-BUCKLING RESPONSE OF LAMINATED COMPOSITE CYLINDRICAL SHELL PANEL WITH SYSTEM RANDOMNESS." International Journal of Applied Mechanics 04, no. 01 (March 2012): 1250009. http://dx.doi.org/10.1142/s1758825112001385.

Full text

Abstract:

The effect of random system properties on thermal post-buckling temperature of laminated composite cylindrical shell panel with temperature independent (TID) and dependent (TD) material properties subjected to uniform temperature distribution is examined in this study. System properties such as material properties, thermal expansion coefficients and lamina plate thickness are modeled as independent basic random variables. The basic formulation is based on higher-order shear deformation (HSDT) theory with von-Karman nonlinearity using modified C0 continuty. A direct iterative-based C0 nonlinear finite element method (FEM) combined with Taylor series-based mean-centered first-order perturbation technique (FOPT) developed by the authors for composite plate is extended for shell panel with reasonable accuracy to compute second-order statistics of post-buckling temperature of cylindrical shell panel. Typical numerical results for second order statistics (mean and coefficient of variance) of thermal post-buckling temperature of laminated cylindrical shell panel are obtained through numerical examples for various support conditions, amplitude ratios, shell thickness ratios, aspect ratios, lamination lay-up sequences, curvature to length ratios, types of material properties with the effect of random system parameters. The performance of outlined approach has been validated with those results available in the literatures and independent MCS.

APA, Harvard, Vancouver, ISO, and other styles

29

Ayoola, Simeon Oluwatoyin, and Hubaidat Oyinkansola Ishola. "The growth performance and genotoxicity effect of dietary Aloe vera on Oreochromis niloticus juveniles." Aceh Journal of Animal Science 5, no. 2 (June 10, 2020): 92–97. http://dx.doi.org/10.13170/ajas.5.2.16044.

Full text

Abstract:

Growth and all activities of fish depend significantly on the food they consume. However, with the rising price of conventional feedstuffs, there is a need to investigate less expensive and readily available plant source as an additive. This research is designed to study the effect of dietary Aloe vera on the growth performance of Oreochromis niloticus juveniles (41.71±0.78g) and its effect on genotoxicity (MN: Micronucleus; LB: Lobed; BD: Bud; BL: Blebbed; BN: Binucleated; NT: Notched). This research investigated the growth performance and genotoxicity activity of Oreochromis niloticus juveniles in a tank culture system. Aloe vera (fine powder) was used as a test ingredient in the feed formulation at five inclusion levels (T1 = 5g, T2 =10g, T3 =15g, T4 =20g, T5 =25g) and the Control diet (C0) without the test ingredient. Test diets were fed to Oreochromis niloticus juveniles, and each diet was assigned to the treatments and control overall in triplicates. Feeding with test diets was for twelve (12) weeks at 5% of their total body weight daily, which was divided into two and administered at 8 hrs and 16 hrs. The result showed that the highest growth rate (10.99 ± 5.49g) and the lowest FCR (0.68 ± 0.08) were recorded in the fish fed with the Control diet (C0). Better growth and nutrient utilization were achieved at low inclusion levels of Aloe vera, at 5g(T1) (8.98 ± 4.49) and 10g (T2) (6.73 ± 3.28) compared to the higher levels of incorporations of the test ingredient. The mean pH and temperature (°C) and dissolved Oxygen level mg/L are 6.50±0.30, 26.3±0.60 and 4.48±0.52mg/L respectively. The values of micronuclei for the cultured Oreochromis niloticus juveniles were recorded to be (T1 = 5.50 ± 0.50, T2 = 2.00 ± 1.00, T3 = 2.00 ± 0.00, T4 = 2.50 ± 1.50, T5 = 4.00 ± 1.00, and C0 = 7.00 ± 2.00). Nuclear abnormalities were recorded in T2 (BD = 1.00 ± 0.00), T3 (NT = 1.00 ± 0.00), T4 (BD = 1.33 ± 0.47, BN = 3.33 ± 0.47), and T5 (BN = 5.33 ± 0.47, LB = 3.00 ± 1.00, BL = 1.67 ± 0.47) . However, no abnormality was recorded in the fish fed with the Control diet (C0). This result showed that the slight addition of this Aloe vera to the diet of Oreochromis niloticus would enhance productivity.

APA, Harvard, Vancouver, ISO, and other styles

30

Zuo, Hao, Yixin Chen, and Feng Jia. "A new C0 layerwise wavelet finite element formulation for the static and free vibration analysis of composite plates." Composite Structures 254 (December 2020): 112852. http://dx.doi.org/10.1016/j.compstruct.2020.112852.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Rêgo Silva, J. J., H. Power, and L. C. Wrobel. "The use of C0,α boundary elements in an improved numerical formulation for three‐dimensional acoustic radiation problems." Journal of the Acoustical Society of America 95, no. 5 (May 1994): 2387–98. http://dx.doi.org/10.1121/1.409848.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Kim, J. H., and Y. Y. Kim. "Analysis of Thin-Walled Closed Beams With General Quadrilateral Cross Sections." Journal of Applied Mechanics 66, no. 4 (December 1, 1999): 904–12. http://dx.doi.org/10.1115/1.2791796.

Full text

Abstract:

This paper deals with the one-dimensional static and dynamic analysis of thin-walled closed beams with general quadrilateral cross sections. The coupled deformations of distortion as well as torsion and warping are investigated in this work. A new approach to determine the functions describing section deformations is proposed. In particular, the present distortion function satisfies all the necessary continuity conditions unlike Vlasov's distortion function. Based on these section deformation functions, a one-dimensional theory dealing with the coupled deformations is presented. The actual numerical work is carried out using two-node C0 finite element formulation. The present one-dimensional results for some static and free-vibration problems are compared with the existing and the plate finite element results.

APA, Harvard, Vancouver, ISO, and other styles

33

Hachemi, M., and SM Hamza-Cherif. "Free vibration analysis of composite laminated and sandwich plate with circular cutout." Journal of Sandwich Structures & Materials 22, no. 8 (November 24, 2018): 2655–91. http://dx.doi.org/10.1177/1099636218811393.

Full text

Abstract:

This paper presents the free vibration analysis of a composite laminated and sandwich square plate with circular cutout. The problem formulation is based on the higher order shear deformation plate theory HDST C0 coupled with a curved quadrilateral p-element. The elements of the stiffness and mass matrices are calculated analytically. The curved edges are accurately represented using the blending function method. A calculation program is developed to determine the fundamental frequencies for different physical and mechanical parameters such as the cutout size and location, plate thickness, fiber orientation angle and boundary conditions. The results obtained show a good agreement with the available solutions in the literature. New results for the fundamentals frequencies of composite laminated and sandwich plates with circular cutout are presented.

APA, Harvard, Vancouver, ISO, and other styles

34

de Jonge, Hylke, Dirk R. Kuypers, Kristin Verbeke, and Yves Vanrenterghem. "Reduced C0 Concentrations and Increased Dose Requirements in Renal Allograft Recipients Converted to the Novel Once-Daily Tacrolimus Formulation." Transplantation 90, no. 5 (September 2010): 523–29. http://dx.doi.org/10.1097/tp.0b013e3181e9feda.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Militello, Carmelo, and Carlos A. Felippa. "A variational justification of the assumed natural strain formulation of finite elements—II. The C0 four-node plate element." Computers & Structures 34, no. 3 (January 1990): 439–44. http://dx.doi.org/10.1016/0045-7949(90)90268-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Mittelstedt, Christian, and Wilfried Becker. "A Variational Model for Boundary Layer Effects in Cross-ply Laminates based on a C0-Continuous Layerwise Displacement Formulation." Journal of Composite Materials 39, no. 20 (June 14, 2005): 1789–818. http://dx.doi.org/10.1177/0021998305051121.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Xiaohui, Ren, and Wu Zhen. "Buckling of soft-core sandwich plates with angle-ply face sheets by means of a C0 finite element formulation." Archive of Applied Mechanics 84, no. 8 (June 8, 2014): 1173–88. http://dx.doi.org/10.1007/s00419-014-0876-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Carpinteri, Alberto, Gianni Niccolini, and Alessio Rubino. "Fractal scaling and crack-size effects on creep crack growth." Strength, Fracture and Complexity 13, no. 3 (December 17, 2020): 131–42. http://dx.doi.org/10.3233/sfc-200260.

Full text

Abstract:

Scaling effects on the creep crack growth behaviour are investigated by analyzing the results of compact tension (CT) tests on different-sized notched steel specimens appearing in the literature. Creep crack growth rate data are correlated to the elastic stress-intensity factor in terms of a Paris-type law, da∕dt = C0Kq, where C0 turns out to be a crack-size dependent coefficient of proportionality. Considering specimens with the same loading configuration (CT) and the same thickness, the observed crack-size effect on the creep crack growth rate is discussed on the basis of self-similarity considerations, and geometrically interpreted in terms of fractal tortuosity of the crack profile. A size-independent formulation of the creep crack growth law correlating renormalized quantities is finally deduced and confirmed by the experimental results.

APA, Harvard, Vancouver, ISO, and other styles

39

Oladeinde, M. H., and John A. Akpobi. "Numerical Analysis of Cold Tube Drawing Operation using Finite Element Method." International Journal of Engineering Research in Africa 5 (July 2011): 44–52. http://dx.doi.org/10.4028/www.scientific.net/jera.5.44.

Full text

Abstract:

In this paper the effect of semi die angle on drawing load in cold tube drawing has been investigated numerically using the finite element method. The equation governing the stress distribution was derived and solved using Galerkin finite element method. An isoparametric formulation for the governing equation was utilized along with C0 cubic isoparametric element. Numerical experimentation showed that the results obtained using the present method is very close to the analytical solution and more accurate than finite difference solution. Having established the accuracy of the present solution method, parametric studies were carried out to show the effect of semi die angle on the drawing load for different tube drawing processes. The analysis was carried out using a Visual Basic.Net program developed by the authors. The results are presented in both graphical and tabular forms.

APA, Harvard, Vancouver, ISO, and other styles

40

&NA;. "MEAN MYCOPHENOLIC ACID TROUGH LEVEL (MPA C0) IS 25% HIGHER FOR MYFORTIC?? COMPARED TO MMF DUE TO DELAYED RELEASE FORMULATION." Transplantation 82, Suppl 2 (July 2006): 999. http://dx.doi.org/10.1097/00007890-200607152-02834.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Shegokar, Niranjan L., and Achchhe Lal. "Stochastic Nonlinear Free Vibration Analysis of Functionally Graded Beam Subjected to Thermal Loading with Random Material Properties." Advanced Materials Research 747 (August 2013): 551–54. http://dx.doi.org/10.4028/www.scientific.net/amr.747.551.

Full text

Abstract:

This paper deals with the stochastic nonlinear free vibration response of functionally graded materials (FGMs) beam subjected to thermal loadings with uncertain material properties subjected to uniform and nonuniform temperature changes with temperature independent (TID) and dependent (TD) material properties. System properties such as material properties of each constituents material and volume fraction index are taken as independent random input variables. The basic formulation is based on higher order shear deformation theory (HSDT) with von-Karman nonlinear strains using modified C0 continuity. A direct iterative based nonlinear finite element method in conjunction with first order perturbation technique (FOPT) is used for FGMs beam to compute the second order statistics (mean and coefficient of variation) of the nonlinear fundamental frequency. The present outlined approach has been validated with the results available in literatures and independent Monte Carlo simulation (MCS).

APA, Harvard, Vancouver, ISO, and other styles

42

Carbaja, Eliu, Mariana Diniz, Roberto Rodriguez-Pacheco, and André Cavalcante. "Contaminant transport model in transient and unsaturated conditions applied to laboratory column test with tailings." Soils and Rocks 45, no. 2 (May 9, 2022): 1–15. http://dx.doi.org/10.28927/sr.2022.076021.

Full text

Abstract:

Mining is an important economic activity in the modern world. However, despite the generated benefits, mining produces tremendous volumes of tailings, an environmental liability with numerous adverse effects. Researches about contaminant transport in tailings dam are important to assess the degree of contamination and to propose preventive or remedial measures. In geotechnical practice, the flow of solutes is generally characterized by numerical solution of the Richards equation to describe water movement followed by advection-dispersion equation to describe contaminant movement. This study aimed to model and simulate contaminant transport in a laboratory column test, using a new analytical formulation and mathematical codes, through tailings in transient unsaturated conditions. The analytical solution for the Richards equation was used to simulate the variation in the volumetric water content and to determine the transient contaminant plume using the advection-dispersion equation subsequently. The models were used to calibrate experimental data from hydraulic characterization and contamination tests. Finally, the normalized contaminant plume (cw/c0) was simulated as a function of time and space. Comparisons with experimental data showed that the analytical formulations adequately expressed the process of contaminant infiltration through the unsaturated porous medium. The formulations offered effectively and are configured as a new approach to solve various contamination problems in transient unsaturated conditions, providing insights into many complex processes that occur in the lab tests and requires far less computational effort compared with current programs to modeling the solute transport using numerical solutions, as the versatile commercial Software HYDRUS.

APA, Harvard, Vancouver, ISO, and other styles

43

NAKAMACHI, Eiji, and Hiroshi KITAGAWA. "Nonlinear Shell Elastic-Plastic Finite-Element Analyses of Rigid Body Contact Problems. C0 Continuity Shell Finite-Element and Implicit-Type Formulation." Transactions of the Japan Society of Mechanical Engineers Series A 57, no. 543 (1991): 2677–82. http://dx.doi.org/10.1299/kikaia.57.2677.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Padhi, Ansuman, and Mihir K. Pandit. "Bending and free vibration response of sandwich laminate under hygrothermal load using improved zigzag theory." Journal of Strain Analysis for Engineering Design 52, no. 5 (July 2017): 288–97. http://dx.doi.org/10.1177/0309324717714710.

Full text

Abstract:

In this work, the effects of variations in temperature and moisture concentrations on the static and free vibration response of sandwich laminated plates with low-density core have been studied. A higher order zigzag laminate theory is used which satisfies the continuity in transverse shear stress at the layer interfaces and zero transverse shear stress condition at the top and bottom surfaces of the laminate . The displacement field in this theory suitably allows for the quadratic distribution of transverse shear stress across the thickness and transverse compressibility effect of the core. An effective finite element formulation is carried out by employing a nine-node C0 isoparametric element for the above plate model. Numerical examples of composite and sandwich laminates with different material properties, effect of temperature and moisture variation, aspect ratios, boundary conditions, number of layers and ply orientations are considered for the analysis. Efficiency of the present plate model in predicting various responses subjected to hygrothermal loading is verified by comparing with the available published results.

APA, Harvard, Vancouver, ISO, and other styles

45

Gadade, Appaso M., Achchhe Lal, and B. N. Singh. "Stochastic First-Ply Failure Analysis of Laminated Composite Plates under in Plane Tensile Loading." Advanced Materials Research 747 (August 2013): 269–72. http://dx.doi.org/10.4028/www.scientific.net/amr.747.269.

Full text

Abstract:

The present work deals with second order statistics of first-ply failure response of geometrically nonlinear laminated composite plate subjected to in-plane tensile loading with random system properties. System properties such as the material properties and lamina plate thickness are modeled as independent random variables.The mathematical formulation is based on higher order shear deformation theory (HSDT) with von-Karman nonlinear kinematics. An efficient C0 nonlinear finite element method based on direct iterative procedure in conjunction with a first order perturbation approach (FOPT) is extended successfully and applied for failure problem in random environment and is employed to evaluate the dimensionless mean failure load and variance of failure index by modeling the system properties as basic random variables using Tsai-Wu and Hoffman failure criteria.Typical numerical results are presented to examine the effect of amplitude ratios, boundary conditions, lamination schemes with random system properties for different failure criterion.The results obtained using present solution approach is validated with the results available in the literatures.

APA, Harvard, Vancouver, ISO, and other styles

46

WOLFF, SEBASTIAN, and CHRISTIAN BUCHER. "ON CONTINUOUS ASSUMED GRADIENT ELEMENTS OF SECOND ORDER." International Journal of Computational Methods 10, no. 01 (February 2013): 1340009. http://dx.doi.org/10.1142/s0219876213400094.

Full text

Abstract:

This paper presents and compares continuous assumed gradient (CAG) methods when applied to structural elasticity. CAG elements are finite elements where the strain, i.e., the deformation gradient, is replaced by a C0-continuous interpolation. Similar approaches are found in nodal integration and SFEM. Recently, interpolation schemes for a continuous assumed deformation gradient were proposed for first order tetrahedral and hexahedral finite elements. These schemes try to balance accuracy and numerical efficiency. At the same time, the stability of the interpolation with respect to hourglassing and spurious low energy modes is ensured. This paper recalls the fundamentals of CAG elements, i.e., the formulation and linearization. Furthermore, it extends the approach to second order finite elements. Examples prove convergence and accuracy of the quadratic elements. Two interpolation schemes, one being supported by finite element nodes and interior points and the other being a higher-order tensor-product polynomial, are identified to be most accurate.

APA, Harvard, Vancouver, ISO, and other styles

47

Lal, Achchhe, and Niranjan L. Shegokar. "Thermoelectrically induced nonlinear free vibration analysis of piezo laminated composite conical shell panel with random fiber orientation." Curved and Layered Structures 4, no. 1 (September 26, 2017): 237–54. http://dx.doi.org/10.1515/cls-2017-0016.

Full text

Abstract:

Abstract This paper presents the free vibration response of piezo laminated composite geometrically nonlinear conical shell panel subjected to a thermo-electrical loading. The temperature field is assumed to be a uniform distribution over the shell surface and through the shell thickness and the electric field is assumed to be the transverse component E2 only. The material properties are assumed to be independent of the temperature and the electric field. The basic formulation is based on higher order shear deformation plate theory (HSDT) with von-Karman nonlinearity. A C0 nonlinear finite element method based on direct iterative approach is outlined and applied to solve nonlinear generalized eigenvalue problem. Parametric studies are carried out to examine the effect of amplitude ratios, stacking sequences, cone angles, piezoelectric layers, applied voltages, circumferential length to thickness ratios, change in temperatures and support boundary conditions on the nonlinear natural frequency of laminated conical shell panels. The present outlined approach has been validated with those available results in the literature.

APA, Harvard, Vancouver, ISO, and other styles

48

Kumar, Rahul, Achchhe Lal, and B. M. Sutaria. "Non-linear deflection and stress analysis of laminated composite sandwich plate with elliptical cutout under different transverse loadings in hygro-thermal environment." Curved and Layered Structures 7, no. 1 (August 12, 2020): 80–100. http://dx.doi.org/10.1515/cls-2020-0008.

Full text

Abstract:

AbstractIn this paper, non-linear transverse deflection, stress and stress concentration factors (SCF) of isotropic and laminated composite sandwich plate (LCSP) with and without elliptical cutouts subjected to various trans-verse loadings in hygrothermal environment are studied. The basic formulation is based on secant function-based shear deformation theory (SFSDT) with von-Karman nonlinearity. The governing equation of non-linear deflection is derived using C0 finite element method (FEM) through minimum potential energy approach. Normalized trans-verse maximum deflections (NTMD) along with stress concentration factor is determined by using Newton’s Raphson method through Gauss point stress extrapolation. Influence of fiber orientations, load parameters, fiber volume fractions, plate span to thickness ratios, aspect ratios, thickness of core and face, position of core, boundary conditions, environmental conditions and types of transverse loading in MATLAB R2015a environment are examined. The numerical results using present solution methodology are verified with the results available in the literatures.

APA, Harvard, Vancouver, ISO, and other styles

49

Kumar, V., and A. V. Singh. "Vibrations of Composite Noncircular Cylindrical Shells." Journal of Vibration and Acoustics 117, no. 4 (October 1, 1995): 470–76. http://dx.doi.org/10.1115/1.2874485.

Full text

Abstract:

The free vibrational characteristics of composite noncircular cylindrical shells are investigated in this paper. The shells are composed of layered media of different material properties. The thickness of each layer is considered to be constant. First order composite shell theory, which includes the effects of shear deformation and rotary inertia, is used in the formulation. A combination of Bezier functions and beam functions is used to describe the displacement fields along the circumference and longitudinal directions, respectively, of the shell surface. The shell is modelled using a number of curved cylindrical panels. Displacement (C0), slope (C1) and curvature (C2) continuities between the panels are enforced by proper blending of the Bezier curves. Numerical results are included for a circular sandwich shell and a two-layer cross-ply oval cylinder that provide excellent agreement with those from the literature. The natural frequencies of clamped oval sandwich cylinders made of stiff outer layers and light middle layer are also presented.

APA, Harvard, Vancouver, ISO, and other styles

50

Sarangan, Suganyadevi, and B. N. Singh. "Evaluation of free vibration and bending analysis of laminated composite and sandwich plates using non-polynomial zigzag models: C0 Finite element formulation." Aerospace Science and Technology 68 (September 2017): 496–508. http://dx.doi.org/10.1016/j.ast.2017.06.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'C0 formulation'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles