scholarly journals The strain-rate sensitivity of irreversible deformation of the metallic multilayer composite GLARE

2019 ◽  
Vol 487 (5) ◽  
pp. 507-510
Author(s):  
N. S. Selyutina ◽  
Yu. V. Petrov ◽  
V. Parameswaran ◽  
A. P. Sharma
Keyword(s):  
Strain Rate ◽  
Sheet Metal ◽  
Dynamic Loading ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
Irreversible Deformation ◽  
Multilayer Composite ◽  
Relaxation Model ◽  
Al 2024

Responses of the aluminum multilayer composite to dynamic loading are described by the relaxation model of plasticity. Relations between the rate sensitivity of the multilayer composite, parameters of the dynamic loading and the strain rate sensitivity of its components are established. It is shown that estimates of the rate sensitivity turned out to be higher for GLARE composite in comparison to the rate sensitivity estimates for its component of Al 2024-T3 sheet metal.

The Strain-Rate Sensitivity of Irreversible Deformation of the Metallic Multilayer Composite GLARE

2019 ◽  
Vol 64 (8) ◽  
pp. 340-343
Author(s):  
N. S. Selyutina ◽  
Yu. V. Petrov ◽  
V. Parameswaran ◽  
A. P. Sharma
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
Irreversible Deformation ◽  
Multilayer Composite

scholarly journals Effect of Cell Wall Ductility and Toughness on Compressive Response and Strain Rate Sensitivity of Aluminium Foam

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Alexandra Byakova ◽  
Svyatoslav Gnyloskurenko ◽  
Andrey Vlasov ◽  
Nikolay Semenov ◽  
Yan Yevych ◽  
...  
Keyword(s):  
Cell Wall ◽  
Strain Rate ◽  
Dynamic Loading ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity ◽  
Melt Processing ◽  
Wall Material ◽  
Static Compression ◽  
Quasi Static Compression ◽  
Al Foams

The study presents the effect of cell wall ductility and toughness on the compressive behaviour of closed-cell Al foams under static and dynamic loading and localised deformation by indentation. Two kinds of Al alloys including relatively ductile AlSiMg alloy and high-strength AlZnMg alloy, which comprises a great amount of brittle eutectic domains, were used as matrix materials. Both kinds of Al foams were fabricated via newly developed melt processing using the CaCO3-foaming agent without Ca additive. Mechanical behaviour of Al foams under quasi-static compression and indentation was examined and compared with that performed under dynamic loading using direct impact tests. Characteristic events revealed in deformation patterns of Al foams at quasi-static compression were also monitored with the CCD camera. Significant differences in stress-strain response and strain rate sensitivity of Al foams arose from the difference in the microstructure, and hence, ductility and toughness of the cell wall material were investigated and discussed.

The Influence of Strain Hardening and Strain-Rate Sensitivity on Sheet Metal Forming

1977 ◽  
Vol 99 (3) ◽  
pp. 264-274 ◽  
Author(s):  
A. K. Ghosh
Keyword(s):  
Strain Rate ◽  
Strain Hardening ◽  
Sheet Metal ◽  
Strain Rate Sensitivity ◽  
Metal Forming ◽  
Rate Sensitivity ◽  
Uniaxial Tensile ◽  
Flow Properties ◽  
Sensitivity Distribution ◽  
Metal Stamping

The current understanding of sheet metal stamping processes is discussed in the light of materials’ ability to distribute plastic strains in uniaxial and biaxial deformation. The focus is on the plastic flow properties, namely strain hardening and strain-rate sensitivity. Distribution of strain from uniaxial tensile specimens and sheets stretched over a rigid punch are presented for a number of sheet materials to illustrate the importance of these properties. Some effects of deformation rate are also presented.

scholarly journals Influence on strain-rate history effects on the development of necking instabilities under dynamic loading conditions

2021 ◽  
Author(s):  
Nicolas Jacques ◽  
Jose Rodriguez-Martinez
Keyword(s):  
Strain Rate ◽  
Dynamic Loading ◽  
Strain Rate Sensitivity ◽  
Work Hardening ◽  
Rate Sensitivity ◽  
Neck Formation ◽  
History Effects ◽  
Instantaneous Strain ◽  
Instantaneous Strain Rate Sensitivity ◽  
Dynamic Loading Conditions

The present paper is devoted to the analysis of strain-rate history effects on neck formation under dynamic loading. For materials presenting strain-rate history effects, two different strain-rate sensitivities should be distinguished: the instantaneous strain-rate sensitivity and the work-hardening strain-rate sensitivity. We have analysed the relative contributions of these two kinds of strain-rate sensitivities to neck retardation for two different configurations: a bar under impact tension and a dynamically expanding ring. For this purpose, we have developed finite element models and, for the second configuration, an analytical model based on the linear stability analysis. The obtained results show that strain-rate history effects have a significant influence on the onset and development of necking. The reason of thisphenomenon is that, contrary to the instantaneous strain-rate sensitivity, the work-hardening strain-rate sensitivity does not contribute to delay the neck formation.

scholarly journals Negative Strain Rate Sensitivity Induced by Structure Heterogeneity in Zr64.13Cu15.75Ni10.12Al10 Bulk Metallic Glass

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 339
Author(s):  
Xiang Wang ◽  
Zhi Qiang Ren ◽  
Wei Xiong ◽  
Si Nan Liu ◽  
Ying Liu ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Strain Rate Sensitivity ◽  
Critical Role ◽  
Rate Sensitivity ◽  
Confined Compression ◽  
Negative Strain Rate Sensitivity ◽  
Cast Specimen ◽  
Structure Heterogeneity

The negative strain rate sensitivity (SRS) of metallic glasses is frequently observed. However, the physical essence involved is still not well understood. In the present work, small-angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (HRTEM) reveal the strong structure heterogeneity at nanometer and tens of nanometer scales, respectively, in bulk metallic glass (BMG) Zr64.13Cu15.75Ni10.12Al10 subjected to fully confined compression processing. A transition of SRS of stress, from 0.012 in the as-cast specimen to −0.005 in compression processed specimen, was observed through nanoindentation. A qualitative formulation clarifies the critical role of internal stress induced by structural heterogeneity in this transition. It reveals the physical origin of this negative SRS frequently reported in structurally heterogeneous BMG alloys and its composites.

Strain rate sensitivity of a 1.5 GPa nanotwinned steel

2021 ◽  
Author(s):  
R.D. Liu ◽  
Y.Z. Li ◽  
L. Lin ◽  
C.P. Huang ◽  
Z.H. Cao ◽  
...  
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Rate Sensitivity
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