scholarly journals Analysis of deformation twinning in tantalum single crystals under shock loading conditions

2013 ◽  
Vol 113 (8) ◽  
pp. 083522 ◽  
Author(s):  
Jeffrey N. Florando ◽  
Nathan R. Barton ◽  
Bassem S. El-Dasher ◽  
James M. McNaney ◽  
Mukul Kumar
Keyword(s):  
Single Crystals ◽  
Shock Loading ◽  
Deformation Twinning ◽  
Loading Conditions

scholarly journals Publisher's Note: “Response and representation of ductile damage under varying shock loading conditions in tantalum” [J. Appl. Phys. 119, 085103 (2016)]

2016 ◽  
Vol 119 (10) ◽  
pp. 109901
Author(s):  
C. A. Bronkhorst ◽  
G. T. Gray ◽  
F. L. Addessio ◽  
V. Livescu ◽  
N. K. Bourne ◽  
...  
Keyword(s):  
Shock Loading ◽  
Ductile Damage ◽  
Loading Conditions

Deformation twinning in vanadium single crystals tested in compression at 77 K

2018 ◽  
Vol 737 ◽  
pp. 413-421 ◽  
Author(s):  
Roman Gröger ◽  
Zdeněk Chlup ◽  
Tereza Kuběnová
Keyword(s):  
Single Crystals ◽  
Deformation Twinning

Equilibrium Conditions and Evolution of Needle Domain Arrays in Ferroelectric Single Crystals

2012 ◽  
Author(s):  
Dorinamaria Carka ◽  
Chad M. Landis
Keyword(s):  
Single Crystals ◽  
Periodic Boundary Conditions ◽  
Loading Conditions ◽  
Phase Field Modeling ◽  
Equilibrium Conditions ◽  
Periodic Arrays ◽  
Linear Finite Element ◽  
Field Modeling ◽  
Representative Unit Cell ◽  
Electromechanical Loading

Experimental imaging of ferroelectric single crystals often reveals the formation of periodic arrays of needle-shaped domains of a compatible polarization variant coexisting with a homogeneous single domain parent variant. This study examines the far field electromechanical loading conditions that favor the formation, existence and evolution of compatible and stable needle domain array patterns using a phase-field modeling approach. The infinite arrays of needles are modeled via a representative unit cell and the appropriate electrical and mechanical periodic boundary conditions. A theoretical investigation of the generalized loading conditions is carried out to determine the sets of averaged loading states that lead to stationary needle tip locations. The resulting boundary value problems are solved using a non-linear finite element method to determine the details of the needle shape as well as the field distributions around the needle tips.

Electrophysical properties of ferroelectrics under shock loading conditions

1980 ◽  
Vol 16 (4) ◽  
pp. 462-466
Author(s):  
E. Z. Novitskii ◽  
V. D. Sadunov ◽  
T. V. Trishchenko
Keyword(s):  
Shock Loading ◽  
Loading Conditions ◽  
Electrophysical Properties

DEFORMATION TWINNING IN Bi-Sb CRYSTALS UNDER DYNAMIC INDENTATION

2001 ◽  
Vol 08 (03n04) ◽  
pp. 241-243 ◽  
Author(s):  
R. C. SHAH
Keyword(s):  
Single Crystals ◽  
Impact Loading ◽  
Deformation Twinning ◽  
Spherical Indenter ◽  
Dynamic Indentation ◽  
Tensile Stresses ◽  
Compressive Stresses ◽  
Mechanical Twins

Bi–Sb single crystals (with Sb concentration varied up to 30 at. %) have been subjected to impact loading in the form of dynamic indentation on their (111) cleavage planes. The resulting mechanical twins are the theme of this report. The tensile and compressive stresses developed by the spherical indenter employed have been differentiated with respect to their role in producing the twins. While the twins produced in the crystals with Sb ≤15 at. % are interpreted as being due to tensile stresses, those in the crystals with Sb>15 at. % are found to be due to compressive stresses.

Experimental Study of the High Temperature Mechanical Behaviors of TLP Bonding of Two Ni-Base Single Crystals

2005 ◽  
Vol 297-300 ◽  
pp. 1489-1494 ◽  
Author(s):  
T. Li ◽  
Qing Yuan Wang ◽  
Ai Qin Wang ◽  
Z.X. Wen ◽  
Zhu Feng Yue
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Base Material ◽  
Static Strength ◽  
Loading Conditions ◽  
Mechanical Behaviors ◽  
Tensile Direction ◽  
Tlp Bonding

In this paper, the mechanical behavior of Ni-base single crystals joint created by TLP bonding is presented. Experimental study has been performed on the TLP single crystal under loading conditions of static uniaxial tension, creep and Three-points-bending (T-P-B) at temperature of 850 °C. Specimens made of the base material, Ni-base single crystal specimens without bonding, were also tested under the same loading conditions. The mechanical behaviors of TLP single crystal is compared to the behaviors of base material. It was found that the static strength of the TLP specimens with the boundary normal to the tensile direction was 63% of the strength of the base material. The creep strength and the fracture ductile strength was more than 57% and 55% of that of the single crystal base material, respectively. The macro and micro graphs of fracture surfaces of specimens indicated that the fracture modes of the samples were brittle fracture.

scholarly journals The effect of residual strain on twinning in shock-loaded copper

1986 ◽  
Vol 44 ◽  
pp. 422-423
Author(s):  
G.T. Gray
Keyword(s):  
Thin Films ◽  
Plastic Strain ◽  
Residual Strain ◽  
Shock Loading ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Experimental Techniques ◽  
Published Data ◽  
Loading Conditions

Under shock-loading, twinning is observed in metals that do not twin under conventional loading conditions, for example copper and nickel where the stacking fault energy is about 78 and 128 ergs/cm2, respectively. Contradictions in the published data on the twinning stress in copper (from 1.6 GPa in thin films to 14.5-20 GPa in bulk specimens suggest differences associated with experimental techniques. This study examines the role of residual plastic strain (eres) on the deformation substructures, particularly twinning, in shock-roaded copper.

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