scholarly journals Investigation on Deformation of DP600 Steel Sheets in Electric-pulse Triggered Energetic Materials Forming

2021 ◽  
Author(s):  
Xueyun Xie ◽  
HaiPing Yu ◽  
Yang Zhong
Keyword(s):  
Plastic Strain ◽  
Energetic Materials ◽  
Strain Distribution ◽  
High Speed ◽  
Pulse Generator ◽  
Electric Pulse ◽  
Chemical Energy ◽  
Discharge Characteristics ◽  
Triggering Process ◽  
Action Stage

Abstract Electric-pulse triggered energetic materials forming (ETEF) is a high-speed manufacturing process, which utilizes the chemical energy released by energetic materials (EMs) triggered by underwater wire discharge to plastically shape metals. The understanding of ETEF is not comprehensive, especially in the research on the discharge characteristics of energetic materials triggered by metal wires and the deformation process of metal sheets. In this paper, the above two problems were studied by means of experiment and numerical simulation. For the pulse discharge characteristics, the peak values of voltage and current were reduced during the triggering process of energetic materials. The triggering energy consumption of energetic materials was quantified to be about 200J. The matching parameters of different capacitor-voltage devices had no effect on triggering the energy release of energetic materials, so the electric pulse generator only played a triggering role on energetic materials. Compared with the quasi-static specimen with the same bulging height, the maximum major strain and thinning rate of the bulged specimen under ETEF condition were significantly reduced, and the deformation uniformity and strain distribution of the specimen were improved. The simulation results showed that the addition of energetic materials significantly improved the plastic strain energy of the blank. The deformation of the blank in ETEF can be divided into two stages: the initial chemical energy action stage and the inertia action stage. The bulging height of sheet metal increased by nearly 301% in inertia action stage, accounting for 80% of the total deformation time, and the effective plastic strain distribution was more uniform.

scholarly journals Energetic-Materials-Driven Synthesis of Graphene-Encapsulated Tin Oxide Nanoparticles for Sodium-Ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2550
Author(s):  
Yingchun Wang ◽  
Jinxu Liu ◽  
Min Yang ◽  
Lijuan Hou ◽  
Tingting Xu ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Energetic Materials ◽  
High Speed ◽  
Coulombic Efficiency ◽  
Sno2 Nanoparticles ◽  
Direct Synthesis ◽  
Exothermic Reaction ◽  
Rate Capability ◽  
Rapid Expansion ◽  
Core Shell

By evenly mixing polytetrafluoroethylene-silicon energetic materials (PTFE-Si EMs) with tin oxide (SnO2) particles, we demonstrate a direct synthesis of graphene-encapsulated SnO2 (Gr-SnO2) nanoparticles through the self-propagated exothermic reaction of the EMs. The highly exothermic reaction of the PTFE-Si EMs released a huge amount of heat that induced an instantaneous temperature rise at the reaction zone, and the rapid expansion of the gaseous SiF4 product provided a high-speed gas flow for dispersing the molten particles into finer nanoscale particles. Furthermore, the reaction of the PTFE-NPs with Si resulted in a simultaneous synthesis of graphene that encapsulated the SnO2 nanoparticles in order to form the core-shell nanostructure. As sodium storage material, the graphene-encapsulated SnO2 nanoparticles exhibit a good cycling performance, superior rate capability, and a high initial Coulombic efficiency of 85.3%. This proves the effectiveness of our approach for the scalable synthesis of core-shell-structured graphene-encapsulated nanomaterials.

Local Texture Evolution by Rate-Independent Polycrystal Model Allowing for Coordination of Interacting Crystals

2005 ◽  
Vol 495-497 ◽  
pp. 965-970
Author(s):  
A.A. Zisman ◽  
Nikolay Y. Zolotorevsky ◽  
N.Yu. Ermakova
Keyword(s):  
Experimental Data ◽  
Plastic Strain ◽  
Strain Distribution ◽  
Texture Evolution ◽  
Spatial Coordination ◽  
Local Texture ◽  
Plastic Strain Distribution ◽  
Simulation Results

A rate-independent polycrystal model, allowing for the shape and spatial coordination of neighboring constitutive crystals and for the plastic strain distribution among them, has been used to simulate the local texture evolution in an Al polycrystal under compression. The simulation results compare favourably to relevant experimental data and show the reorientation path of each crystal to strongly depend on orientations of its immediate neighbors.

Plastic Strain Distribution at the Tips of Propagating Fatigue Cracks

1976 ◽  
Vol 98 (1) ◽  
pp. 24-29 ◽  
Author(s):  
D. L. Davidson ◽  
J. Lankford
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Plastic Strain ◽  
Plastic Zone ◽  
Strain Distribution ◽  
Dimensionless Parameter ◽  
Fatigue Cracks ◽  
Crack Tip ◽  
Cyclic Plastic Zone ◽  
Plastic Zones

The techniques of selected area electron channeling and positive replica examination have been used to study the plastic zones attending fatigue crack propagation in 304 SS, 6061-T6 aluminum alloy, and Fe-3Si steel. These observations allowed the strain distribution at the crack tip to be determined. The results indicate that the concepts of a monotonic and a cyclic plastic zone are essentially correct, with the strains at demarcation between these two zones being 3 to 6 percent. Strain distribution varies as r−1/2 in the cyclic zone and as ln r in the monotonic plastic zone. The strain distributions for all materials studied may be made approximately coincident by using a dimensionless parameter related to distance from the crack tip.

scholarly journals Visualization of Plastic Strain Distribution in a Dual-Phase Steel Using High-Precision Grid-Markers

2012 ◽  
Vol 98 ◽  
pp. 303-310 ◽  
Author(s):  
Hidekazu Minami ◽  
Hiroshi Ikeda ◽  
Tatsuya Morikawa ◽  
Kenji Higashida ◽  
Tsuyoshi Mayama ◽  
...  
Keyword(s):  
Plastic Strain ◽  
High Precision ◽  
Strain Distribution ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
Plastic Strain Distribution

FINITE ELEMENT ANALYSIS OF CONSTRAINED GROOVE PRESSING OF PURE ALUMINUM SHEETS

2013 ◽  
Vol 02 (01) ◽  
pp. 1350001 ◽  
Author(s):  
S. S. SATHEESH KUMAR ◽  
I. BALASUNDAR ◽  
T. RAGHU
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Plastic Strain ◽  
Deformation Behavior ◽  
Strain Distribution ◽  
Pure Aluminum ◽  
Detailed Examination ◽  
Deformation Characteristics ◽  
Element Analysis ◽  
Aluminum Sheets

Constrained groove pressing (CGP) is an attractive severe plastic deformation technique capable of processing ultrafine grained/nanostructured sheet materials. The deformation behavior of pure aluminum during constrained groove pressing is investigated by carrying out a two-dimensional finite element analysis (FEA). FEA predicted deformation behavior observed during each stages of pressing indicated almost negligible deformation in flat regions, whereas the inclined shear regions revealed diverse deformation characteristics. The plastic strain distributions unveiled inhomogeneous strain distribution at the end of one pass. Detailed examination of plastic strain evolution during CGP along various sections divulged superior strain distribution along middle surfaces when compared to top and bottom surfaces. The degree of strain homogeneity is evaluated quantitatively along different regions of the sheet and is correlated to the deformation characteristics. Load–stroke characteristics obtained during corrugating and flattening of sheets exhibited three stages and two stages behavior, respectively. The results obtained from the analysis are experimentally validated by processing pure aluminum sheets by CGP and the measured deformation homogeneity is benchmarked with FEA results.

Overview: High Speed Dynamics and Modelling as It Applies to Energetic Solids

1992 ◽  
Vol 296 ◽  
Author(s):  
J. Covino ◽  
S. A. Finnegan ◽  
O. E. R Heimdahl ◽  
A. J. Lindfors ◽  
J. K. Pringle
Keyword(s):  
Energetic Materials ◽  
High Speed ◽  
Shock Loading ◽  
Dynamic Deformation ◽  
Two Dimensional ◽  
State Data ◽  
Impact Modelling ◽  
Shock Response ◽  
Hazard Assessments ◽  
Reaction Thresholds

AbstractThis paper discusses experimental techniques and modelling tools used to characterize energetic solids subjected to dynamic deformation and shock. Critical experiments have been designed to study shock response and impact sensitivity of energetic materials. For example, a simplified two dimensional experiment has been developed to study the critical phenomena involved in delayed detonation reactions (XDT). In addition, wedge tests are used to obtain equation-of-state data. Coupled with hydrocodes, these experiments give us an in-depth understanding of the response of energetic materials subjected to shock loading. A coupled methodology using both experimental and modelling tools is presented. Consisting of three parts, it addresses all possible responses to fragment impact. The three parts are: (1) Fragment impact modelling (hydrocodes and empirically based codes); (2) Experiments to obtain accurate data for predicting prompt detonation; and (3) Tests with planar rocket motor models to explore mechanisms related to bum reaction thresholds and degree of violence. This methodology is currently being used in weapon design and munitions hazard assessments.

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