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article

The Behavioural Framework of a Lightly Cemented High Plasticity Clay Under Low Effective Stresses

Smaragda Efthymiou, Michael Kavvadas

Geotechnical and Geological Engineering > 2019 > 37 > 5 > 4269-4283

This paper presents the findings of an experimental study on the primary yielding and failure mechanisms of an artificially prepared lightly cemented high plasticity clay, using fly ash as the cementation binder and on the influence of its presence in the soil matrix. The study was conducted for a series of triaxial isotropically consolidated compression and extension tests in the low stress range...

article

Texture and Anisotropy Parameters of Pressed MA14 Alloy Pipes Produced by Granule Metallurgy Methods

S. Ya. Betsofen, V. Yu. Konkevich, O. E. Osintsev, I. A. Grushin, more

Inorganic Materials: Applied Research > 2018 > 9 > 3 > 551-557

The effect of the granular technology on the formation of the crystallographic texture during the extrusion of MA14 magnesium alloy pipes with a diameter of 105 mm and a wall thickness of 5 mm was studied. The pipes were manufactured from pressed workpieces fabricated by hot molding compaction of magnesium granules, which were produced by centrifugal spraying of melt in a helium gas medium at the...

article

Biaxial tensile behavior and yield loci of dual-phase steel sheets

Zhao-xuan Hou, Min Wan, Xiang-dong Wu, Zheng-yang Cai, more

Journal of Iron and Steel Research International > 2018 > 25 > 5 > 589-597

The biaxial tensile tests were carried out to investigate the deformation behavior and yield loci of dual-phase (DP) steel sheets under biaxial tensile conditions. The true stress–true strain curves of DP steel sheets for different loading ratios were obtained, and the experimental yield loci were determined based on the equivalent plastic work principle. The experimental yield loci were compared...

article

Microstructure, texture and mechanical properties of hot rolled metastable β-titanium alloy Ti-5Al-3.5Mo-7.2V-3Cr

Premkumar Manda, Srinivasa Rao Nandam, Uday Chakkingal, A.K. Singh

Materials Today: Proceedings > 2017 > 4 > 2 Part A > 851-856

This paper presents the microstructure, texture and mechanical properties of a 70% unidirectionally hot rolled metastable β-titanium alloy Ti-5Al-3.5Mo-7.2V-3Cr. The alloy displays two-phase microstructure consisting of fine α phase within the β matrix. The presence of the α phase within β matrix retards the recrystallization kinetics. Texture of the β phase displays both the deformation and recrystallization...

article

Yielding of cement-mixed gravelly soil affected by viscous property, ageing and damage

Alan Ezaoui, Fumio Tatsuoka, Yohei Maeda, Yuta Sasaki, more

Soils and Foundations > 2016 > 56 > 1 > 73-92

The yielding of compacted moist cement-mixed gravelly (CMG) soil, subjected to arbitrary loading histories with two stress variables, is studied by means of non-standard drained triaxial compression tests. A non-linear three-component model is modified to describe the elasto-viscoplastic property affected by ageing and shear yielding-associated damage. The development of the inviscid yield locus (YL)...

article

How tightly does calcite e-twin constrain stress?

Atsushi Yamaji

Journal of Structural Geology > 2015 > 72 > Complete > 83-95

Mechanical twinning along calcite e-planes has been used for paleostress analyses. Since the twinning has a critical resolved shear stress at ∼10 MPa, not only principal stress axes but also differential stress can be determined from the twins. In this article, five-dimensional stress space used in plasticity theory was introduced to describe the yield loci of calcite e-twinning. The constraints to...

article

Deduction of a porosity-dependent yield criterion and its geometrical description for porous materials

Shunhu Zhang, Xiaodong Chen

International Journal of Mechanical Sciences > 2014 > 89 > Complete > 58-64

A yield criterion for porous materials, referred to as porosity-dependent (PD) yield criterion, is proposed in this paper. In order to reflect the change law between Poisson׳s ratio and material porosity, the relationship between them is established using a logarithm-fraction compound function. Then the criterion firstly weighted by Poisson׳s ratio and ultimately incorporated with material porosity...

article

Mechanical properties anisotropy of cold rolled and solution annealed Ni–20Cr–8Fe alloy

K.K. Mehta, Prantik Mukhopadhyay, R.K. Mandal, A.K. Singh

Materials Science and Engineering: A > 2014 > 613 > C > 71-81

Present work describes a correlation amongst texture, in-plane anisotropy in tensile properties and yield locus in Ni–20Cr–8Fe alloy. The alloy exhibits high and moderate values of in-plane anisotropy and anisotropy index, respectively. This has been attributed to the presence of moderate overall intensity of texture as well as partially recrystallized microstructure. The tensile properties evaluated...

article

Yielding of cement-treated marine clay

HuaWen Xiao, Fook Hou Lee, Kheng Ghee Chin

Soils and Foundations > 2014 > 54 > 3 > 488-501

This paper presents the findings of an experimental study on the primary yielding and post-yield behavior of cement-treated Singapore marine clay. The study was conducted using unconfined compression tests and triaxial tests. The results show that all the primary yield loci for the cement-treated marine clay have a consistent shape regardless of the mix ratio, curing stress or curing period. Three...

article

Correlation of powder flow properties to interparticle interactions at ambient and high temperatures

Igino Tomasetta, Diego Barletta, Massimo Poletto

Particuology > 2014 > 12 > Complete > 90-99

A combination of a continuum approach and a particle–particle approach to describe the multi-scale nature of the mechanical properties of bulk solids may be beneficial to scientific and engineering applications. In this paper, a procedure is proposed to estimate the interparticle forces beginning with the bulk flow properties as measured with standardized techniques. In particular, the relationship...

article

In-situ measurement of loading stresses with X-ray diffraction for yield locus determination

A. Güner, B. Zillmann, T. Lampke, A. E. Tekkaya

International Journal of Automotive Technology > 2014 > 15 > 2 > 303-316

The application of the X-ray diffraction method is introduced to solve the problem of inhomogeneous deformation fields in the specimens used for sheet metal characterization. In this method, strains are measured on one side of a specimen with optical measurement systems. On the other side, loading stresses on a specimen are captured with an X-ray diffractometer mounted on a universal testing machine...

article

Yield Locus of a Cold Rolled and Solution Treated Nimonic-263 Alloy Sheet, Determined Using Asymmetrical Knoop Micro Hardness Indenter

K. Ankamma, A. K. Singh, K. S. Prasad, G. Chandra Mohan Reddy, more

Transactions of the Indian Institute of Metals > 2014 > 67 > 4 > 531-539

The Von Mises or perhaps the Tresca criterion is adequate for predicting the onset of yielding under combined stress loading for isotropic materials. However, this prediction is not so straight forward for anisotropic materials in which the magnitude of tensile and compressive yield stresses are different along the different orientations. Such directionality in yield behavior of anisotropic materials...

article

Effects of Anisotropic Yield Functions on the Accuracy of Forming Simulations of Hole Expansion

Eiji Iizuka, Kazuma Hashimoto, Toshihiko Kuwabara

Procedia Engineering > 2014 > 81 > Complete > 2433-2438

The deformation behavior of a high strength steel sheet in hole expansion tests using a flat-bottomed cylindrical punch has been investigated both experimentally and analytically to clarify the effects of anisotropic yield functions on the accuracy of finite element simulations of hole expansion. The material used in the hole expansion tests is a high strength steel with a tensile strength of 590MPa...

article

Evolution of the plastic anisotropy with straining and its implication on formability for sheet metals

Y.G. An, H. Vegter, S. Melzer, P. Romano Triguero

Journal of Materials Processing Tech. > 2013 > 213 > 8 > 1419-1425

The plastic anisotropy r-value is an important material parameter in sheet metal forming. The length and width strains are measured conventionally in the uniaxial tensile test using two extensometers and the r-value is fitted within a certain strain range by linear regression according to the international standard. In this study, the physical character of the plastic anisotropy is analyzed for several...

article

The High Temperature Annular Shear Cell: A modified ring shear tester to measure the flow properties of powders at high temperature

Igino Tomasetta, Diego Barletta, Massimo Poletto

Advanced Powder Technology > 2013 > 24 > 3 > 609-617

Although changes of cohesive behaviour of powders is observed at high temperature in several industrial process units, conventional testers and procedures are still not suited for testing powder flow properties at high temperature. In this work a High Temperature Annular Shear Cell was designed, built and set-up in order to directly measure the flow properties of powders up to 500°C. A temperature...

article

Thermal Annealing Effect on Elastic-Plastic Behavior of Al-Si-Cu Structural Films Under Uniaxial and Biaxial Tension

Takahiro Namazu, Masayuki Fujii, Hiroki Fujii, Kei Masunishi, more

Journal of Microelectromechanical Systems > 2013 > 22 > 6 > 1414 - 1427

In this paper, the influence of thermal annealing on the elastic-plastic behavior of Al-Si-Cu films under uniaxial and biaxial tensile stress states is described. For the mechanical evaluation of the films, we used an in-plane biaxial tensile test equipment that was specially designed and developed. In the uniaxial tensile test in which the strain rate was varied from $4.0\times 10^{-4}$ to $5.0\times 10^{-3}~{\rm s}^{-1}$ ...

article

Characterization of anisotropy of sheet metals employing inhomogeneous strain fields for Yld2000-2D yield function

A. Güner, C. Soyarslan, A. Brosius, A.E. Tekkaya

International Journal of Solids and Structures > 2012 > 49 > 25 > 3517-3527

A method to include the distribution of strains in the identification of the planar anisotropy of sheet metals is proposed. The method includes the optical measurement of strains on a flat specimen with a varying cross-section and an inverse parameter identification scheme which minimizes the differences between the numerical simulation results and the experimental measurements by using Levenberg–Marquardt...

article

Effect of mode of deformation by rolling on texture evolution and yield locus anisotropy in a multifunctional β titanium alloy

M. Premkumar, V.S. Himabindu, S. Banumathy, A. Bhattacharjee, more

Materials Science & Engineering A > 2012 > 552 > Complete > 15-23

Present work describes the evolution of texture during different modes of deformation by cold rolling of a Gum metal or multifunctional β titanium alloy. The cold rolled materials exhibit the presence of β and small amount of stress induced martensitic (α″) phases. The development of texture has been explained in terms of α and γ fibres. The effect of different modes of rolling results in different...

article

Effect of pendular liquid bridges on the flow behavior of wet powders

Tim O. Althaus, Erich J. Windhab, Nathalie Scheuble

Powder Technology > 2012 > 217 > Complete > 599-606

Yield loci of wet glass bead powders in the pendular state were measured at different consolidation stresses, solid mass fractions and binder viscosities. A semi-empirical model was developed to describe the relationship between the liquid bridge adhesion forces and the yield loci. It is demonstrated that the slope angle of the linearized yield locus does not vary with the consolidation stress nor...

article

Crystal plasticity finite-element simulation of work-hardening behavior in a magnesium alloy sheet under biaxial tension

Takayuki Hama, Hirohiko Takuda

Computational Materials Science > 2012 > 51 > 1 > 156-164

This paper presents the prediction of the contours of plastic work for an AZ31 magnesium alloy sheet in the first quadrant of the stress space using a rate-dependent crystal plasticity finite-element method. The contour of plastic work was initially rather flat in the vicinity of equi-biaxial tension, but bulged severely thereafter. Evidently, the shapes of the contours changed as the plastic work...

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The Behavioural Framework of a Lightly Cemented High Plasticity Clay Under Low Effective Stresses

Texture and Anisotropy Parameters of Pressed MA14 Alloy Pipes Produced by Granule Metallurgy Methods

Biaxial tensile behavior and yield loci of dual-phase steel sheets

Microstructure, texture and mechanical properties of hot rolled metastable β-titanium alloy Ti-5Al-3.5Mo-7.2V-3Cr

Yielding of cement-mixed gravelly soil affected by viscous property, ageing and damage

How tightly does calcite e-twin constrain stress?

Deduction of a porosity-dependent yield criterion and its geometrical description for porous materials

Mechanical properties anisotropy of cold rolled and solution annealed Ni–20Cr–8Fe alloy

Yielding of cement-treated marine clay

Correlation of powder flow properties to interparticle interactions at ambient and high temperatures

In-situ measurement of loading stresses with X-ray diffraction for yield locus determination

Yield Locus of a Cold Rolled and Solution Treated Nimonic-263 Alloy Sheet, Determined Using Asymmetrical Knoop Micro Hardness Indenter

Effects of Anisotropic Yield Functions on the Accuracy of Forming Simulations of Hole Expansion

Evolution of the plastic anisotropy with straining and its implication on formability for sheet metals

The High Temperature Annular Shear Cell: A modified ring shear tester to measure the flow properties of powders at high temperature

Thermal Annealing Effect on Elastic-Plastic Behavior of Al-Si-Cu Structural Films Under Uniaxial and Biaxial Tension

Characterization of anisotropy of sheet metals employing inhomogeneous strain fields for Yld2000-2D yield function

Effect of mode of deformation by rolling on texture evolution and yield locus anisotropy in a multifunctional β titanium alloy

Effect of pendular liquid bridges on the flow behavior of wet powders

Crystal plasticity finite-element simulation of work-hardening behavior in a magnesium alloy sheet under biaxial tension

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