stress-strain properties of polycrystalline graphites in tension and compression

A microplane constitutive model for shape memory alloys

2015/6/4To attribute suitable material parameters to the finite element model, the experimental stress–strain response in uniaxial tension–compression is used to calibrate the required quantities. Table 7 shows the calibrated material parameters for case 6, which was performed isothermally at 298 K. Figure 11 depicts the predicted stress–strain response that correlates fairly well and is fitted

On the mechanical behavior of single crystal NiTi shape memory alloys and related polycrystalline

2008/4/18and tension-compression asymmetry of the critical stress required to trigger the transformation in single crystals of NiTi as experimentally demonstrated [12,22,23] and predicted by models [35,36,38,39]. There-fore, if polycrystalline NiTi contains a strong

1.4: Stress

2021/3/24Figure 15: Stress-strain curve in tension and compression. There are some practical difficulties in performing stress-strain tests in compression. If excessively large loads are mistakenly applied in a tensile test, perhaps by wrong settings on the testing machine, the specimen simply breaks and the test must be repeated with a new specimen.

On the mechanical behavior of single crystal NiTi shape memory alloys and related polycrystalline

2008/4/18and tension-compression asymmetry of the critical stress required to trigger the transformation in single crystals of NiTi as experimentally demonstrated [12,22,23] and predicted by models [35,36,38,39]. There-fore, if polycrystalline NiTi contains a strong

Stress

Longitudinal and transverse stress-strain curves were obtained by static tension and compression tests for several grades of polycrystalline graphite. The stress was applied cyclically either in tension or compression to observe hysteresis effects and residual strain as a function of stress.

Crystallographic texturing effects on shape recovery strain

In addition, the critical stress for stress-induced martensitic transformation was higher in compression than in tension. The recovery strain associated with the transformation, had an average value of 5.5 +/-0.25% in tension and 3.5 +/-0.25% in compression, giving a strain ratio of 1:57.

Plasticity size eects in free

amine size eects on mechanical properties of free-standing polycrystalline FCC thin lms.We present stress–strain curves obtained on lms 0.2, 0.3, 0.5 and 1 :0 m thick including speci-men widths of 2.5, 5.0, 10.0 and 20:0 m for each thickness.Elastic modulus

(PDF) Correlation between Engineering Stress

Correlation between Engineering Stress-Strain and True Stress-Strain Curve Mohammad Azimi Related Papers Mechanical Properties of Metals By Lav Kush Kumar Chapter-6-----MSE-177 By Nazmul Ahsan Mechanical Behaviour of Modified 9Cr-1Mo Steel Weld

On the theoretical interrelations between

1994/7/1The stress-strain curves of polycrystalline martensitic NiTi shape memory alloys are often different for loading under tension and compression. Under tension, a flat stress-plateau occurs, while under compression, the material is quickly strain hardened and no flat stress-plateau is observed.

On the Strain Saturation Conditions for Polycrystalline

properties of the matrix are taken to be a self-consistent average of the incremental behavior of all of the single crystals. Hence, a stress or strain history can be applied to the polycrystal and the model can be used to determine the corresponding strain or stress

Modeling the Stress Strain Relationships and Predicting Failure

inelastic stress-strain behavior in tension and compression. If the inelastic behavior of graphite exhibits anisotropic behavior the model will be extended to account for transversely isotropic time dependent responses. The theory is derived from a scalar dissipative

TAM 554 Lecture #3

True Stress-Strain Curve Stress - Strain curve in tension and compression coincide if true stress σ is plotted against time (or natural) strain ε. σ= P A = current load/current crossectional area dε= dℓ ℓ = change in length/current length. ε= ℓn ℓ ℓ o ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ ; ℓ

A microplane constitutive model for shape memory alloys

2015/6/4To attribute suitable material parameters to the finite element model, the experimental stress–strain response in uniaxial tension–compression is used to calibrate the required quantities. Table 7 shows the calibrated material parameters for case 6, which was performed isothermally at 298 K. Figure 11 depicts the predicted stress–strain response that correlates fairly well and is fitted

Effect of Non

2011/10/3In general the presented model predicts well the level of the superelastic stress plateau and maximum transformation strain in tension. The agreement in compression is worse but the overall characteristics of the tension-compression asymmetry are predicted correctly.

Tensile fracture in notched polycrystalline graphite

2010/7/1It is well-known that some of the polycrystalline graphites exhibit nonlinear stress–strain responses in a standard tension (or compression) test conducted on a plain test specimen. When using a plain specimen with no stress concentration, a considerable volume of material often undergoes nonlinear deformation before final failure.

On the mechanical behavior of single crystal NiTi shape memory alloys and related polycrystalline

2008/4/18and tension-compression asymmetry of the critical stress required to trigger the transformation in single crystals of NiTi as experimentally demonstrated [12,22,23] and predicted by models [35,36,38,39]. There-fore, if polycrystalline NiTi contains a strong

Stress

Longitudinal and transverse stress-strain curves were obtained by static tension and compression tests for several grades of polycrystalline graphite. The stress was applied cyclically either in tension or compression to observe hysteresis effects and residual strain as a function of stress.

TAM 554 Lecture #3

True Stress-Strain Curve Stress - Strain curve in tension and compression coincide if true stress σ is plotted against time (or natural) strain ε. σ= P A = current load/current crossectional area dε= dℓ ℓ = change in length/current length. ε= ℓn ℓ ℓ o ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ ; ℓ

Strain rate dependence of tension and compression

2017/10/15Fig. 2 shows the stress-strain curves of the npc VN sample under uniaxial tension and compression at a series of strain rates, and these curves are very close to each other at initial linear elastic stage, showing that the elastic property is modestly sensitive to the strain rate.

Microstructure and Properties of Deformation Processed

2012/9/13K. Gall, H. Sehitoglu, Y.I. Chumlyakov, and I.V. Kireeva, Tension-Compression Asymmetry of the Stress-Strain Response in Aged Single Crystal and Polycrystalline NiTi, Acta Mater., 1999, 47(4), p 1203–1217 CrossRef Google Scholar

A Neutron Diffraction and Modeling Study of Uniaxial Deformation in Polycrystalline Beryllium

The deformation of polycrystalline beryllium to strains of 60.8 pct in uniaxial tension and com pression was studied by neutron diffraction and modeled using an elasto-plastic self-consistent (EPSC) model.

(PPT) Mechanical properties of nanocrystalline metals

Stress–strain response of a NC metal, e.g., copper, under tension shows a rapid peak and subsequent softening due largely to necking. The absence of strain hardening (dr/de = 0) causes localized deformation leading to low ductility. Flat compression curves have also been observed for other nanocrystalline metals including Fe (BCC) [10] and Ti (HCP) [7].

Tensile fracture in notched polycrystalline graphite

2010/7/1It is well-known that some of the polycrystalline graphites exhibit nonlinear stress–strain responses in a standard tension (or compression) test conducted on a plain test specimen. When using a plain specimen with no stress concentration, a considerable volume of material often undergoes nonlinear deformation before final failure.

Investigation of Cyclic Deformation and Fatigue of Polycrystalline Cu under Pure Compression Cyclic Loading Conditions

Instead, the cyclic stress-strain response for pure compression fatigue was correlated with surface morphology evolution. In other words, cyclic creep under pure compression fatigue was caused mainly by the mechanism of grain boundary extrusion. Such

Functional Properties of Shape Memory Materials and

of strain rate on deformation behavior, cyclic deformation properties, micromechanical model of polycrystalline SMAs, application of thermomechanical model to tension-compression behavior, the transformation-induced creep and stress relaxation

Asymmetry of stress

1998/7/24The stress-strain curves of polycrystalline martensitic NiTi shape memory alloys are often different for loading under tension and compression. Under tension, a flat stress-plateau occurs, while under compression, the material is quickly strain hardened and no flat stress-plateau is observed.

Prediction of stress

sensitive properties should be reflected also in a change in the damping capacity. It is known that damping is a function of stress (3-4), although the precise function may not be known; it is also known that strain is a function of stress. Therefore, a correlation

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