Optical-structural machine analysis of heterogeneous materials as a basis for forming its physical mechanical properties

1994 ◽  
Author(s):  
Eduard I. Ulianov ◽  
Konstantin M. Ivanov
Keyword(s):  
Mechanical Properties ◽  
Heterogeneous Materials ◽  
Machine Analysis

scholarly journals Microstructure and Mechanical Properties of Al-Mg-Si Similar Alloy Laminates Produced by Accumulative Roll Bonding

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4200
Author(s):  
Zhigang Li ◽  
Hao Jiang ◽  
Minghui Wang ◽  
Hongjie Jia ◽  
Hongjiang Han ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Accumulative Roll Bonding ◽  
Thin Sheet ◽  
Heterogeneous Materials ◽  
Thick Sheet ◽  
Subsequent Aging ◽  
Roll Bonding ◽  
Roll Casting ◽  
Promotive Effect ◽  
Similar Materials

As the applications of heterogeneous materials expand, aluminum laminates of similar materials have attracted much attention due to their greater bonding strength and easier recycling. In this work, an alloy design strategy was developed based on accumulative roll bonding (ARB) to produce laminates from similar materials. Twin roll casting (TRC) sheets of the same composition but different cooling rates were used as the starting materials, and they were roll bonded up to three cycles at varying temperatures. EBSD showed that the two TRC sheets deformed in distinct ways during ARB processes at 300°C. Major recrystallizations were significant after the first cycle on the thin sheet and after the third cycle on the thick sheet. The sheets were subject to subsequent aging for better mechanical properties. TEM observations showed that the size and distribution of nano-precipitations were different between the two sheet sides. These nano-precipitations were found to significantly promote precipitation strengthening, and such a promotive effect was referred to as hetero-deformation induced (HDI) strengthening. Our work provides a new promising method to prepare laminated heterogeneous materials with similar alloy TRC sheets.

Micromechanical Modeling of Heterogeneous Materials with Irregularly Shaped Pores

2011 ◽  
Vol 488-489 ◽  
pp. 327-330
Author(s):  
Igor Tsukrov ◽  
Borys Drach
Keyword(s):  
Mechanical Properties ◽  
Numerical Analysis ◽  
Heterogeneous Materials ◽  
Micromechanical Modeling ◽  
Pore Geometry ◽  
Irregular Shapes ◽  
Mechanical Properties Of Materials ◽  
Properties Of Materials ◽  
Compliance Contribution Tensor

An approach to predict the overall mechanical properties of materials containing pores of irregular shapes is described. Micromechanical modeling is performed by evaluating cavity compliance contribution tensors of individual pores [1] which are then used as an input for well-developed homogenization models. The cavity compliance contribution tensor can be found either analytically or numerically depending on the pore geometry and the level of anisotropy of the surrounding material. The results of numerical analysis can be used to compare the ability of differently shaped pores to initiate fracture.

scholarly journals Microstructure and mechanical properties of hyperuniform heterogeneous materials

2017 ◽  
Vol 96 (4) ◽  
Author(s):  
Yaopengxiao Xu ◽  
Shaohua Chen ◽  
Pei-En Chen ◽  
Wenxiang Xu ◽  
Yang Jiao
Keyword(s):  
Mechanical Properties ◽  
Heterogeneous Materials ◽  
Microstructure And Mechanical Properties

scholarly journals Some Novel Numerical Applications of Cosserat Continua

2018 ◽  
Vol 15 (06) ◽  
pp. 1850054 ◽  
Author(s):  
Nicholas Fantuzzi ◽  
Lorenzo Leonetti ◽  
Patrizia Trovalusci ◽  
Francesco Tornabene
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Size Effects ◽  
Heterogeneous Materials ◽  
Numerical Implementation ◽  
The Finite Element Method ◽  
Strong Formulation ◽  
Cosserat Continua ◽  
Element Method

Cosserat continua demonstrated to have peculiar mechanical properties, with respect to classic Cauchy continua, because they are able to more accurately describe heterogeneous materials, as particle composites and masonry-like material, taking into account size effects. Many studies have been devoted to their numerical implementation. In this paper, some reference benchmarks, referred to an isotropic heterogeneous sample, are shown by comparing the solutions provided by strong and weak formulations. The strong formulation finite element method (SFEM), implemented in MATLAB®, is compared to the finite element method (FEM), given by COMSOL® Multiphysics, and the advantages of the two approaches are highlighted and discussed.

scholarly journals A Study on Strengthening Mechanical Properties of a Punch Mold for Cutting by Using an HWS Powder Material and a DED Semi-AM Method of Metal 3D Printing

2020 ◽  
Vol 4 (4) ◽  
pp. 98 ◽  
Author(s):  
Seong-Woong Choi ◽  
Yong-Seok Kim ◽  
Young-Jin Yum ◽  
Soon-Yong Yang
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Powder Material ◽  
Hot Stamping ◽  
Heterogeneous Materials ◽  
Heterogeneous Material ◽  
High Strength ◽  
High Wear Resistance ◽  
Metal 3D Printing ◽  
Directed Energy

The post-processing (punching or trimming) of high-strength parts reinforced by hot stamping requires punch molds with improved mechanical properties in hardness, resistance to wear, and toughness. In this study, a semi-additive manufacturing (semi-AM) method of heterogeneous materials was proposed to strengthen these properties using high wear resistance steel (HWS) powder and directed energy deposition (DED) technology. To verify these mechanical properties as a material for the punch mold for cutting, specimens were prepared and tested by a semi-AM method of heterogeneous material. The test results of the HWS additive material by the semi-AM method proposed in this study are as follows: the hardness was 60.59–62.0 HRc, which was like the Bulk D2 specimen. The wear resistance was about 4.2 times compared to that of the D2 specimen; the toughness was about 4.0 times that of the bulk D2 specimen; the compressive strength was about 1.45 times that of the bulk D2 specimen; the true density showed 100% with no porosity. Moreover, the absorption energy was 59.0 J in a multi-semi-AM specimen of heterogeneous materials having an intermediate buffer layer (P21 powder material). The semi-AM method of heterogeneous materials presented in this study could be applied as a method to strengthen the punch mold for cutting. In addition, the multi-semi-AM method of heterogeneous materials will be able to control the mechanical properties of the additive material.

scholarly journals Mechanical Deconvolution of Elastic Moduli by Indentation of Mechanically Heterogeneous Materials

2021 ◽  
Vol 9 ◽  
Author(s):  
J. N. M. Boots ◽  
R. Kooi ◽  
T. E. Kodger ◽  
J. van der Gucht
Keyword(s):  
Mechanical Properties ◽  
Accurate Determination ◽  
Finite Size ◽  
Heterogeneous Materials ◽  
Heterogeneous Material ◽  
Length Scale ◽  
Mechanical Heterogeneity ◽  
Force Microscopy ◽  
Probe Size ◽  
Stress Signal

Most materials are mechanically heterogeneous on a certain length scale. In many applications, this heterogeneity is crucial for the material’s function, and exploiting mechanical heterogeneity could lead to new materials with interesting features, which require accurate understanding of the local mechanical properties. Generally used techniques to probe local mechanics in mechanically heterogeneous materials include indentation and atomic force microscopy. However, these techniques probe stresses at a region of finite size, so that experiments on a mechanically heterogeneous material lead to blurring or convolution of the measured stress signal. In this study, finite element method simulations are performed to find the length scale over which this mechanical blurring occurs. This length is shown to be a function of the probe size and indentation depth, and independent of the elastic modulus variations in the heterogeneous material, for both 1D and 2D modulus profiles. Making use of these findings, we then propose two deconvolution methods to approximate the actual modulus profile from the apparent, blurred measurements, paving the way for an accurate determination of the local mechanical properties of heterogeneous materials.

Computational homogenisation approach applied to improve mechanical properties of heterogeneous materials

2021 ◽  
Vol 40 (6) ◽  
Author(s):  
José Julio de Cerqueira Pituba ◽  
Wanderson Ferreira dos Santos ◽  
Geovana Alves Ribeiro ◽  
Gabriela Rezende Fernandes
Keyword(s):  
Mechanical Properties ◽  
Heterogeneous Materials ◽  
Computational Homogenisation
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