scholarly journals Конечно-элементное моделирование одноосного растяжения образцов из функционально-градиентного материала с использованием мультилинейной модели пластичности

2021 ◽  
Vol 91 (1) ◽  
pp. 26
Author(s):  
В.Ш. Суфияров ◽  
А.В. Орлов ◽  
Е.В. Борисов ◽  
И.А. Полозов ◽  
А.А. Попович ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Plastic Material ◽  
Material Model ◽  
Mechanical Effect ◽  
Functionally Graded ◽  
Bilinear Model ◽  
Graded Materials ◽  
Element Approach ◽  
Simulation Results ◽  
Level Of Agreement

In this paper, the authors suggested a finite element approach to the simulation of mechanical properties of functionally graded materials (FGM) using a multilinear plastic material model. The approach was used to simulate tensile test experiments on the homogeneous specimens manufactured at two laser power regimes and composite specimens based on the materials considered. We showed a correlation between the simulation results and the experiment. We studied the mechanical effect of geometry and size of inserts in the composite specimens and determined that changing the size and geometry of the inserts can modify the mechanical characteristics of the specimen. We found that the multilinear plastic material model provides the highest level of agreement between simulation and experimental results and, unlike the bilinear model, is more comprehensive.

scholarly journals Micromechanical Behavior of Single-Crystal Superalloy with Different Crystal Orientations by Microindentation

2015 ◽  
Vol 2015 ◽  
pp. 1-15
Author(s):  
Jinghui Li ◽  
Fuguo Li ◽  
Junzhe Dong ◽  
Zhanwei Yuan ◽  
Shuo Zhang
Keyword(s):  
Single Crystal ◽  
Interplanar Spacing ◽  
Plastic Material ◽  
Material Model ◽  
Material Parameters ◽  
Nickel Based Superalloy ◽  
Crystal Orientations ◽  
Dislocation Hardening ◽  
Simulation Results ◽  
Elastic Plastic Material

In order to investigate the anisotropic micromechanical properties of single-crystal nickel-based superalloy DD99 of four crystallographic orientations, (001), (215), (405), and (605), microindentation test (MIT) was conducted with different loads and loading velocities by a sharp Berkovich indenter. Some material parameters reflecting the micromechanical behavior of DD99, such as microhardnessH, Young’s modulusE, yield stressσy, strain hardening componentn, and tensile strengthσb, can be obtained from load-displacement relations.HandEof four different crystal planes evidently decrease with the increase ofh. The reduction ofHis due to dislocation hardening whileEis related to interplanar spacing and crystal variable.σyof (215) is the largest among four crystal planes, followed by (605), and (001) has the lowest value.nof (215) is the lowest, followed by (605), and that of (001) is the largest. Subsequently, a simplified elastic-plastic material model was employed for 3D microindentation simulation of DD99 with various crystal orientations. The simulation results agreed well with experimental, which confirmed the accuracy of the simplified material model.

Two-Dimensional Modeling of Functionally Graded Viscoelastic Materials Using a Boundary Element Approach

2012 ◽  
Vol 463-464 ◽  
pp. 570-574 ◽  
Author(s):  
Hosein Ashrafi ◽  
M.R. Bahadori ◽  
M. Shariyat
Keyword(s):  
Boundary Element ◽  
Material Properties ◽  
Boundary Integral ◽  
Functionally Graded ◽  
Graded Materials ◽  
Dimensional Modeling ◽  
Integral Equation Approach ◽  
Element Approach ◽  
Composition Changes ◽  
Exponentially Graded

In this paper, a 2D boundary element approach able to model viscoelastic functionally graded materials (FGM) is presented. A numerical implementation of the Somigliana identity for displacements is developed to solve 2D problems of exponentially graded elasticity. An FGM is an advanced material in which its composition changes gradually resulting in a corresponding change in properties of the material. The FGM concept can be applied to various materials for structural and functional uses. Our model needs only the Green’s function of nonhomogeneous elastostatic problems with material properties that vary continuously along a given dimension. We consider the material properties to be an exponential function of Cartesian coordinates x. As application, a numerical example is provided to validate the proposed boundary integral equation approach.

Control of Mechanical Properties of Functionally Graded Dual-Nanoparticle-Reinforced Composites

2018 ◽  
Vol 941 ◽  
pp. 2037-2040
Author(s):  
Han Sang Kwon ◽  
Je Hong Park ◽  
Kwon Hoo Kim ◽  
Marc Leparoux ◽  
Jean Francois Silvain ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Mechanical Characteristics ◽  
Functionally Graded ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Layered Composites ◽  
Graded Materials ◽  
Al Matrix Composites ◽  
Al Matrix Composite ◽  
Al Matrix

Functionally graded aluminium (Al) matrix composite materials reinforced with carbon nanotubes (CNT) and silicon carbide nanoparticles (nSiC) or nanodiamond (nD) were fabricated using a powder-metallurgical route. The nSiC and nD were not only used as a reinforcement but also as an active solid mixing agent for dispersing the CNT in the Al powder. Dual-nanoparticle-reinforced functionally graded multiple-layered composites were found to exhibit different mechanical characteristics. In particular, the hardnesses of the CNT-and nSiC-reinforced composites were dramatically increased, being up to eight times greater (330 HV) than that of bulk pure Al. In the case of the combination of the CNT and nD nanoparticles, the reinforced Al matrix composites exhibited the highest flexural strength (about 760 MPa). This functionally graded dual-nanoparticle approach could also be applied to other nanoreinforced systems, such as ceramics or complex hybrid-matrix materials. Keywords: Carbon nanotubes (CNT), nanosilicon carbide (nSiC), nanodiamond (nD), functionally graded materials (FGM), Powder metallurgy

Tensile and Compression Analyses to Investigate the Mesoscale Mechanical Characteristics Influential for Press Formability of CFRP Sheets

2018 ◽  
Vol 920 ◽  
pp. 217-222 ◽  
Author(s):  
Takahiro Hayashi ◽  
Tetsuo Oya
Keyword(s):  
Carbon Fiber ◽  
Mechanical Characteristics ◽  
Plastic Material ◽  
Material Model ◽  
Ductile Material ◽  
Cfrp Sheets ◽  
Specific Strength ◽  
Test Standards ◽  
Press Forming ◽  
Increasing Demand

Carbon fiber reinforced plastic (CFRP) is applied in various fields such as automobile and aerospace industry due to high specific strength and rigidity than metals. However, since its ductility is poor, there are problems that it is difficult to perform press forming and the production cost increases. In recent years, studies on improving the ductility of CFRP for realizing press forming are gradually increasing. Experiments to obtain the mechanical properties of CFRP are costly and time consuming. Although there are several test standards in the compression test for CFRP, none of them evaluates mesoscale compression characteristics, and it is difficult to capture the deformation of internal fibers and resins when the sheet is subjected to forming. Therefore, establishing an analytical model that expresses the deformation of CFRP by evaluating mesoscale mechanical characteristics would be important to meet the increasing demand for the press forming of CFRP sheets. In this research, by modeling and analyzing CFRP sheets in microscale, the influence of the interaction between resin and fiber within a CFRP during plastic deformation was evaluated. The carbon fiber was modeled to observe its kink behavior based on an orthotropic elastic material model. The epoxy resin was regarded as a ductile material and a Gurson-Tvergaard-Needleman (GTN) model was applied, which represent a viscoelastic plastic material considering damage by void generation, growth and coalescence. Simulations were performed by changing the GTN parameters, and this paper explains the influence of each parameter on formability based on the analysis result.

Dynamic Analysis with Stress Recovery for Functionally Graded Materials: Numerical Simulation and Experimental Benchmarking

2014 ◽  
Vol 2 (1) ◽  
pp. 21
Author(s):  
Carlos Alberto Dutra Fraga Filho ◽  
Fernando César Meira Menandro ◽  
Rivânia Hermógenes Paulino de Romero ◽  
Juan Sérgio Romero Saenz
Keyword(s):  
Numerical Simulation ◽  
Dynamic Analysis ◽  
Functionally Graded Materials ◽  
Functionally Graded ◽  
Stress Recovery ◽  
Graded Materials
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