Shear Stress in Nickel and Ni-60Co under One-Dimensional Shock Loading

2006 ◽  
Author(s):  
A. Workman
Keyword(s):  
Shear Stress ◽  
Shock Loading ◽  
One Dimensional

Shear stress measurement in nickel and nickel–60 wt% cobalt during one-dimensional shock loading

2007 ◽  
Vol 42 (15) ◽  
pp. 5941-5948 ◽  
Author(s):  
J. C. F. Millett ◽  
Y. J. E. Meziere ◽  
N. K. Bourne
Keyword(s):  
Shear Stress ◽  
Shock Loading ◽  
Stress Measurement ◽  
One Dimensional

Modeling of Wall Friction for Multispecies Solid-Gas Flows

1986 ◽  
Vol 108 (4) ◽  
pp. 486-488 ◽  
Author(s):  
E. D. Doss ◽  
M. G. Srinivasan
Keyword(s):  
Shear Stress ◽  
Flow Model ◽  
Flow Characteristics ◽  
Wall Friction ◽  
Gas Flows ◽  
Two Phase ◽  
One Dimensional ◽  
Friction Models ◽  
Wall Interaction ◽  
The One

The empirical expressions for the equivalent friction factor to simulate the effect of particle-wall interaction with a single solid species have been extended to model the wall shear stress for multispecies solid-gas flows. Expressions representing the equivalent shear stress for solid-gas flows obtained from these wall friction models are included in the one-dimensional two-phase flow model and it can be used to study the effect of particle-wall interaction on the flow characteristics.

Computational design of recovery experiments for ductile metals

2005 ◽  
Vol 461 (2062) ◽  
pp. 3297-3312 ◽  
Author(s):  
N.K Bourne ◽  
G.T Gray
Keyword(s):  
Fracture Toughness ◽  
Shock Loading ◽  
Computational Design ◽  
Current Paper ◽  
Uniaxial Loading ◽  
Ductile Metals ◽  
One Dimensional ◽  
Recovery Techniques ◽  
Recovery Technique

Previous work on the shock loading of metals, has shown that one-dimensional strain histories may be only be approximated in a loaded sample if it is to be recovered at late times to examine microstructure. This proceeds through the use of a system of partial momentum traps and soft, shock-recovery techniques. However, limitations in the degree of uniaxial loading, and on the trapping of tensile pulses, have led to redesign of the target. In the current paper the technique is first assessed, and then modifications are explored to further refine it. Additionally it is illustrated how it may be applied to successfully recover targets of lower innate fracture toughness than has been previously documented. In the first part of the paper, the authors review work undergone to shock recover metals, and highlight associated constraints. In the latter part of the paper, a series of hydrocode simulations is presented to illustrate the design of an improved shock recovery technique that has now been adopted.

scholarly journals The Behavior of Ni, Ni-60Co, and Ni3Al during One-Dimensional Shock Loading

2007 ◽  
Vol 39 (2) ◽  
pp. 322-334 ◽  
Author(s):  
J.C.F. Millett ◽  
N.K. Bourne ◽  
G.T. Gray
Keyword(s):  
Shock Loading ◽  
One Dimensional

Measurement of the shear strength of pure tungsten during one-dimensional shock loading

2007 ◽  
Vol 101 (3) ◽  
pp. 033520 ◽  
Author(s):  
J. C. F. Millett ◽  
G. T. Gray ◽  
N. K. Bourne
Keyword(s):  
Shear Strength ◽  
Shock Loading ◽  
Pure Tungsten ◽  
One Dimensional

The response of TiAl based alloys to one-dimensional shock loading

2002 ◽  
Vol 50 (19) ◽  
pp. 4801-4811 ◽  
Author(s):  
J.C.F. Millett ◽  
N.K. Bourne ◽  
G.T. Gray ◽  
I.P. Jones
Keyword(s):  
Shock Loading ◽  
One Dimensional

scholarly journals Variations in Hardness with Position In One Dimensionally Recovered Shock Loaded Metals

2018 ◽  
Vol 183 ◽  
pp. 02013 ◽  
Author(s):  
G. Whiteman ◽  
D.L. Higgins ◽  
B. Pang ◽  
J.C.F. Millett ◽  
Y-L. Chiu ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Shock Loading ◽  
Mechanical Response ◽  
High Strain ◽  
Cold Work ◽  
Constitutive Models ◽  
Target Assembly ◽  
One Dimensional ◽  
The Impact

The microstructural and mechanical response of materials to shock loading is of the utmost importance in the development of constitutive models for high strain-rate applications. However, unlike a purely mechanical response, to ensure that the microstructure has been generated under conditions of pure one dimensional strain, the target assembly requires both a complex array of momentum traps to prevent lateral releases entering the specimen location from the edges and spall plates to prevent tensile interactions (spall) affecting the microstructure. In this paper, we examine these effects by performing microhardness profiles of shock loaded copper and tantalum samples. In general, variations in hardness both parallel and perpendicular to the shock direction were small indicating successful momentum trapping. Variations in hardness at different locations relative to the impact face are discussed in terms of the initial degree of cold work and the ability to generate and move dislocations in the samples.

Analysis of Single-Grooved Slider and Journal Bearing With Partial Slip Surface

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
T. V. V. L. N. Rao
Keyword(s):  
Shear Stress ◽  
Pressure Distribution ◽  
Journal Bearing ◽  
Slip Surface ◽  
Partial Slip ◽  
Maximum Pressure ◽  
Slider Bearing ◽  
Slip Coefficient ◽  
One Dimensional ◽  
Slip Region

In this paper, pressure and shear stress are derived under steady state using one-dimensional analysis of the single-grooved slider bearing and journal bearing with partial slip on the stationary surface. The Reynolds boundary conditions are used in the analysis of journal bearing to predict the extent of the full film region. In the cases of partial slip slider and journal bearing, the pressure distribution is higher compared with the conventional bearing with no slip. In the case of partial slip on both slider and journal bearing surfaces, the single-groove, immediately followed by the partial slip region, results in the increase in pressure distribution. The results also show that in comparison to the conventional bearing with no slip, in the cases of partial slip slider and journal bearing, the shear stress increases before the region of slip/no slip interface, while the shear stress decreases in the region of no slip. In the case of the partial slip region on bearing surfaces, the shear stress distribution is lower in the region immediately after the groove. Significant pressure distribution is obtained due to the influence of partial slip on the slider bearing with uniform film thickness and the concentric journal bearing. The maximum pressure occurs at the end of the region of groove, immediately followed by the region of the partial slip. It is found that the pressure distribution of the slider and journal bearing with partial slip surface are not influenced with the further increase in the nondimensional slip coefficient (A) from 10 to 100.

Sign in / Sign up

Export Citation Format

Share Document