1,932 research outputs found
A numerical approach to multi-level, elastic modeling of weakened particle-reinforced brittle composites
No full textMicromechanics-based Elastoplastic Multi-Level Damage Modeling of Ductile Polymeric Composites with Weakened Interface
No full textMulti-scale prediction of mechanical properties of nanoparticle reinforced polymeric composites
No full textAn elastoplastic damage model for metal matrix composites considering progressive imperfect interface under transverse loading
No full textAn elastoplastic damage model considering progressive imperfect interface is proposed to predict the effective elastoplastic behavior and multi-level damage progression in fiber-reinforced metal matrix composites (FRMMCs) under transverse loading. The modified Eshelby's tensor for a cylindrical inclusion with slightly weakened interface is adopted to model fibers having mild or severe imperfect interfaces [Lee, H.K., Pyo, S.H., 2009. A 3D-damage model for fiber-rein forced brittle composites with microcracks and imperfect interfaces. J. Eng. Mech. ASCE. doi: 10.1061/(ASCE)EM.1943-7889.0000039]. An elastoplastic model is derived micromechanically on the basis of the ensemble-volume averaging procedure and the first-order effects of eigenstrains. A multi-level damage model [Lee, H.K., Pyo, S.H., 2008a. Multi-level modeling of effective elastic behavior and progressive weakened interface in particulate composites. Compos. Sci. Technol. 68, 387-397] in accordance with the Weibull's probabilistic function is then incorporated into the elastoplastic multi-level damage model to describe the sequential, progressive imperfect interface in the composites. Numerical examples corresponding to uniaxial and biaxial transverse tensile loadings are solved to illustrate the potential of the proposed micromechanical framework. A series of parametric analysis are carried out to investigate the influence of model parameters on the progression of imperfect interface in the composites. Furthermore, a comparison between the present prediction and experimental data in the literature is made to assess the capability of the proposed micromechanical framework
An elastoplastic multi-level damage model for ductile matrix composites considering evolutionary weakened interface
No full textAbstractAn elastoplastic multi-level damage model considering evolutionary weakened interface is developed in this work to predict the effective elastoplastic behavior and multi-level damage evolution in particle reinforced ductile matrix composites (PRDMCs). The elastoplastic multi-level damage model is micromechanically derived on the basis of the ensemble-volume averaging procedure and the first-order effects of eigenstrains. The Eshelby’s tensor for an ellipsoidal inclusion with slightly weakened interface [Qu, J., 1993a. Eshelby tensor for an elastic inclusion with slightly weakened interfaces. Journal of Applied Mechanics 60 (4), 1048–1050; Qu, J., 1993b. The effect of slightly weakened interfaces on the overall elastic properties of composite materials. Mechanics of Materials, 14, 269–281] is adopted to model particles having mildly or severely weakened interface, and a multi-level damage model [Lee, H.K., Pyo, S.H., in press. Multi-level modeling of effective elastic behavior and progressive weakened interface in particulate composites. Composites Science and Technology] in accordance with the Weibull’s probabilistic function is employed to describe the sequential, progressive weakened interface in the composites. Numerical examples corresponding to uniaxial, biaxial and triaxial tension loadings are solved to illustrate the potential of the proposed micromechanical framework. A series of parametric analysis are carried out to investigate the influence of model parameters on the progression of weakened interface in the composites. Furthermore, the present prediction is compared with available experimental data in the literature to verify the proposed elastoplastic multi-level damage model
Numerical investigation on strengthening performance of shear deficient RC beams bonded with CFRP laminates
No full textNumerical Analysis of Laminated Composite Beam Based on Micromechanical Multi-Level Damage Model
No full textMicromechanics-based elastic-damage analysis of laminated composite structures
No full textAbstractBased on the micromechanics-based constitutive model, derived in our preceding work [Lee, H.K., Pyo, S.H., 2009. A 3D-damage model for fiber-reinforced brittle composites with microcracks and imperfect interfaces. Journal of Engineering Mechanics-ASCE, in press, doi:10.1061/(ASCE)EM.1943.7889.0000039.], incorporating a multi-level damage model and a continuum damage model, the overall elastic behavior and damage evolution of laminated composite structures are studied in detail. The constitutive model is implemented into the finite element program ABAQUS using a user-subroutine UMAT to solve boundary value problems of the composite structures. The validity of the implemented constitutive model is assured by comparing the predicted stress–strain curves with experimental data available in literature under uniaxial tension with various fiber orientations. The results show that the proposed micromechanics-based constitutive model accurately predict the overall elastic-damage behavior of laminated composite structures having different material compositions, thicknesses and boundary conditions
Pada Notaris Dan Pejabat Pembuat Akta Tanah ( PPAT ) Triniken Tiyas Tirlin, S.H. PROSEDUR PERALIHAN HAK MILIK ATAS TANAH DALAM JUAL BELI
No full textIn practice the implementation of the Job�s authors chose a place in the Field Word Practive Notary and PPAT (Pejabat Pembuat Akta Tanah) Triniken Tiyas Tirlin, S.H., which is located at Jalan Kaliurang Km. 6,3, Sleman, Yogyakarta, on a recommendation by a friend that the Notary Triniken Tiyas Tirlin, S.H., Notary is one of the senior and very professional, it can be seen from the experience of the Triniken Tiyas Tirlin, S.H. working in the field, so i think it would be a lot of knowledge and experience which can be given to the author.
In this final writer lift procedure swiching land ownership in buying and selling, because the authors have based on observations of the author during an internship in the office of the Notary and PPAT Triniken Tiyas Tirlin, S.H. the office very often visited clients who want to enlist the services to be made a deed of agreement buying and selling land in particular. Thus the authors are very interested to learn and understand the procedures and processes of transfer of rights over land for sale.
the TA is the author discusses about the procedur transitional land ownership in the sale and purchase on the understanding that it includes buying and selling, understanding and agreement of sale with the procedures of ground objects began with the issuance of the certificate request to the tranfer of rights
Micromechanics-based elastic damage modeling of particulate composites with weakened interfaces
No full textAbstractA micromechanical framework is proposed to predict the effective elastic behavior and weakened interface evolution of particulate composites. The Eshelby’s tensor for an ellipsoidal inclusion with slightly weakened interface [Qu, J., 1993a. Eshelby tensor for an elastic inclusion with slightly weakened interfaces. Journal of Applied Mechanics 60 (4), 1048–1050; Qu, J., 1993b. The effect of slightly weakened interfaces on the overall elastic properties of composite materials. Mechanics of Materials 14, 269–281] is adopted to model spherical particles having imperfect interfaces in the composites and is incorporated into the micromechanical framework. Based on the Eshelby’s micromechanics, the effective elastic moduli of three-phase particulate composites are derived. A damage model is subsequently considered in accordance with the Weibull’s probabilistic function to characterize the varying probability of evolution of weakened interface between the inclusion and the matrix. The proposed micromechanical elastic damage model is applied to the uniaxial, biaxial and triaxial tensile loadings to predict the various stress–strain responses. Comparisons between the present predictions with other numerical and analytical predictions and available experimental data are conducted to assess the potential of the present framework
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