Synergistic Effect of Energy Absorption and Adiabatic Temperature on the Microstructural Evolution and Mechanical Properties During High-Speed Impacts

Siddique, Farah; Li, Fuguo; Hussain, Mirza Zahid; Zhao, Qian; Li, Qinghua

doi:10.1007/s12540-023-01466-y

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…This corresponds to the fact that dDRX (dynamic recrystallization) was initialized during the deformation; it eliminated the dislocations and refined the grain size, thereby enhancing the toughness and ductility. Therefore, it can be inferred that the result of a high stress and low thermal softening generates uniformly distributed equiaxed fine grains, as reported in various studies [ 28 , 35 ].…”

Section: Numerical Simulation Of Projectile Target Impact Of Layered ...mentioning

confidence: 66%

“…Equations (9) and (10) were obtained from the modified Thomson model [ 35 ], where

is the energy in the through-thickness direction of the front layer and

is the energy that propagates in the radial direction in the front layer. When the leftover energy is sufficient enough to reach the second layer and travel through it, it can be given by

based on the Florence model [ 36 ].…”

Section: Analytical Model Of Layered Composite Materials Systemmentioning

confidence: 99%

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Design and Performance of Layered Heterostructure Composite Material System for Protective Armors

Siddique

Hussain

et al. 2023

Materials

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A new layered heterostructure composite material system (TC4 as front layer and 2024Al alloy as back layer) was developed and analyzed for its design and performance in terms of an enhanced absorption capability and anti-penetration behavior. The Florence model for energy absorption was modified, so that it can be utilized for the layered heterostructure composite material system with more efficacy. Numerical simulation through Ls-Dyna validated the analytical model findings regarding the energy absorption of the system and both were in good agreement. Results showed that two ductile materials with diverse properties, the hardness gradient and varied layer thickness joined together, specifically behaved like a unified structure and exhibited elastic collision after slight bending, which is possibly due to the decreased yield strength of the front layer and increased yield strength of the second layer. To validate the analytical and numerical findings, the samples of the layered heterostructure composite material system were subjected to a SHPB (Split Hopkinson pressure bar) compression test. The deformation behavior was analyzed in the context of the strain energy density and stain rate sensitivity parameter at different strain rates. The encouraging results proposed that two ductile materials with a hardness gradient can be used as an alternate structure instead of a brittle–ductile combination in a layered structure.

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Section: Numerical Simulation Of Projectile Target Impact Of Layered ...mentioning

confidence: 66%

“…Equations (9) and (10) were obtained from the modified Thomson model [ 35 ], where

is the energy in the through-thickness direction of the front layer and

is the energy that propagates in the radial direction in the front layer. When the leftover energy is sufficient enough to reach the second layer and travel through it, it can be given by

based on the Florence model [ 36 ].…”

Section: Analytical Model Of Layered Composite Materials Systemmentioning

confidence: 99%

Design and Performance of Layered Heterostructure Composite Material System for Protective Armors

Siddique

Hussain

et al. 2023

Materials

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A Practical Inverse Identification of Johnson–Cook Parameters at Intermediate Strain Rates Using Split Hopkinson Pressure Bar Test

Jeong,

Hong,

Won

et al. 2024

Met. Mater. Int.

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A practical inverse method based on the hybrid experiment-finite element (FE) simulation is proposed for identifying strain rate sensitivity of a metal covering intermediate to dynamic loading conditions. The methodology uses the dynamic split Hopkinson pressure bar (SHPB) test for measuring mechanical responses at medium strain rates by optimizing temperature increase, non-uniform strain rate distributed in the non-standard notched SHPB specimens. From the standard dynamic SHPB test, the thermal softening index of the Johnson–Cook (JC) model is first determined by fitting the FE simulation to temperature changes in the specimen. The discrepancy between the measured and predicted flow stresses with the conventional JC model can be attributed to the assumption of constant strain rate sensitivity. Therefore, the new approach using the notched SHPB specimens under dynamic loadings is introduced to identify mechanical responses covering a broader range of strain rate. Finally, the strain rate sensitivity parameter in the JC model as a function of strain rate is evaluated through the inverse FE scheme, in which the sigmoidal function is determined to be optimum by predicting the flow stresses under wider range of strain rate, especially in the intermediate range of strain rate. The present study provides a new methodology based on hybrid experiment and numerical simulation to fill the gap in predicting mechanical responses between quasi-static and dynamic tests using commonly available tensile test and SHPB test. Graphical Abstract

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Effect of Elevated Temperature on Low Cycle Fatigue and Tensile Strength of 12Cr Ferritic Steel

Baek,

Park,

Nguyen

2024

Met. Mater. Int.

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Synergistic Effect of Energy Absorption and Adiabatic Temperature on the Microstructural Evolution and Mechanical Properties During High-Speed Impacts

Cited by 6 publications

References 29 publications

Design and Performance of Layered Heterostructure Composite Material System for Protective Armors

Design and Performance of Layered Heterostructure Composite Material System for Protective Armors

A Practical Inverse Identification of Johnson–Cook Parameters at Intermediate Strain Rates Using Split Hopkinson Pressure Bar Test

Effect of Elevated Temperature on Low Cycle Fatigue and Tensile Strength of 12Cr Ferritic Steel

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