Adiabatic shear bands in the Taylor impact test for a WHA rod

1998 ◽  
Vol 14 (9) ◽  
pp. 841-854 ◽  
Author(s):  
J.B. Stevens ◽  
R.C. Batra
Keyword(s):  
Impact Test ◽  
Shear Bands ◽  
Adiabatic Shear ◽  
Adiabatic Shear Bands ◽  
Taylor Impact ◽  
Taylor Impact Test

Multiple Adiabatic Shear Bands in Ti–6Al–4V Targets under Ballistic Impact

2012 ◽  
Vol 581-582 ◽  
pp. 448-452
Author(s):  
Kai Sun ◽  
Xiao Dong Yu ◽  
Shu Hua Li ◽  
Cheng Wen Tan ◽  
Fu Chi Wang
Keyword(s):  
High Speed ◽  
Impact Test ◽  
Maximum Shear Stress ◽  
Shear Bands ◽  
Adiabatic Shear ◽  
Ballistic Impact ◽  
Adiabatic Shear Bands ◽  
Steel Cylinder ◽  
The Impact ◽  
Good Agreement

In order to research the formation and spread of adiabatic shear bands in Ti-6Al-4V targets, LS-DYNA code is used to simulate the ballistic impact process. The projectile used in the impact test is a flat-headed steel cylinder with diameter of 7.62mm and length of 39mm. The results of simulated and impact test are in good agreement. Multiple adiabatic shear bands form in Ti-6Al-4V targets under high-speed ballistic impact. Adiabatic shear bands were found to extend parallel with a certain distance. The formation and distribution of adiabatic shear bands was related to the breaking-off of projectiles, which was caused by the distribution of maximum shear stress in Ti-6Al-4V targets and projectiles.

The Effect of Secondary Metalworking Processes on Susceptibility of Aircraft to Catastrophic Failures and Prevention Methods

2013 ◽  
Vol 58 (4) ◽  
pp. 1207-1212
Author(s):  
E.S. Dzidowski
Keyword(s):  
Dynamic Recovery ◽  
Fatigue Cracks ◽  
Shear Bands ◽  
Adiabatic Shear ◽  
Deformation Mechanisms ◽  
Processing Maps ◽  
Adiabatic Shear Bands ◽  
Flow Localization ◽  
Catastrophic Failures ◽  
Prevention Methods

Abstract The causes of plane crashes, stemming from the subcritical growth of fatigue cracks, are examined. It is found that the crashes occurred mainly because of the negligence of the defects arising in the course of secondary metalworking processes. It is shown that it is possible to prevent such damage, i.e. voids, wedge cracks, grain boundary cracks, adiabatic shear bands and flow localization, through the use of processing maps indicating the ranges in which the above defects arise and the ranges in which safe deformation mechanisms, such as deformation in dynamic recrystallization conditions, superplasticity, globularization and dynamic recovery, occur. Thanks to the use of such maps the processes can be optimized by selecting proper deformation rates and forming temperatures.

scholarly journals Adiabatic shear bands formation in polycrystalline aluminium

2021 ◽  
Vol 1121 (1) ◽  
pp. 012007
Author(s):  
I Mania ◽  
H Paul ◽  
R Chulist ◽  
P Petrzak
Keyword(s):  
Shear Bands ◽  
Adiabatic Shear ◽  
Adiabatic Shear Bands

Formation of adiabatic shear bands and instability of plastic flow in Zr and Zr-Nb alloys in spherical stress waves

1999 ◽  
Vol 42 (1) ◽  
pp. 61-71 ◽  
Author(s):  
A.V Dobromyslov ◽  
N.I Taluts ◽  
N.V Kazantseva ◽  
E.A Kozlov
Keyword(s):  
Plastic Flow ◽  
Shear Bands ◽  
Stress Waves ◽  
Adiabatic Shear ◽  
Adiabatic Shear Bands

A microstructural investigation of adiabatic shear bands in an interstitial free steel

2007 ◽  
Vol 457 (1-2) ◽  
pp. 205-218 ◽  
Author(s):  
J.F.C. Lins ◽  
H.R.Z. Sandim ◽  
H.-J. Kestenbach ◽  
D. Raabe ◽  
K.S. Vecchio
Keyword(s):  
Shear Bands ◽  
Adiabatic Shear ◽  
Interstitial Free ◽  
Adiabatic Shear Bands ◽  
Microstructural Investigation ◽  
Interstitial Free Steel

Deformation and Failure Mechanisms of Austenitic Piping Under the Influence of Oxyhydrogen Reactions

2016 ◽  
Author(s):  
Stefan Offermanns ◽  
Stefan Weihe
Keyword(s):  
Failure Mechanisms ◽  
Shear Bands ◽  
Adiabatic Shear ◽  
Material Behavior ◽  
Inert Gas ◽  
Materials Testing ◽  
Failure Model ◽  
Adiabatic Shear Bands ◽  
Deformation And Failure ◽  
Gas Component

The present paper deals with the deformation and failure mechanisms of austenitic piping under the influence of oxyhydrogen reactions for the safety evaluation of incident scenarios in technical installations based on previous work of the author [1–5]. For the characterization of the processes, detonation tests performed at the Materials Testing Institute University of Stuttgart (MPA Stuttgart) have been used. The aim of these experiments was to study the detonation processes in head spray cooling piping of boiling water reactors. The experiments were performed on austenitic pipes with an outer diameter of O. D. = 114.3 mm and various wall thicknesses. Oxyhydrogen was used in its stoichiometric ratio of 2H2+O2 mixed with various amounts of an inert gas component. These tests have shown that less amounts of reactive gas may result in a stronger reaction of the pipe structure. This observation is attributed to the influence of the so-called overdriven detonation. Depending on the ratio of oxyhydrogen to the inert gas component and the pipe-wall thickness, adiabatic shear bands can occur in the piping structure. Adiabatic shear bands are very narrow zones with intense localized shear deformations due to the conversion of a significant portion of strain energy into heat. In order to describe this phenomenon numerically, a strain-based failure model was used which can reflect material damage over a wide range of different stress states. However, it has shown that damage of the studied material depends significantly on the Lode angle. Furthermore, no clear dependence of the failure limit on the loading rate has been found for the studied material. For the constitutive description of the material behavior under the occurring loading rates and temperatures suitable material models were selected and the required parameters have been evaluated experimentally and verified by numerical methods. With the aid of this constitutive description of the material behavior and the failure model numerical simulations of the detonation tests were carried out.

Influence of Cutting Conditions on the Width of Adiabatic Shear Bands: An Investigation Using Finite Element Simulation

2013 ◽  
Vol 820 ◽  
pp. 194-199
Author(s):  
Tao Cui ◽  
Hong Wei Zhao ◽  
Ye Tian ◽  
Chuang Liu
Keyword(s):  
High Speed ◽  
Shear Bands ◽  
Chip Thickness ◽  
Rake Angle ◽  
Adiabatic Shear ◽  
Adiabatic Shear Bands ◽  
High Speed Cutting ◽  
Model Combining ◽  
Cutting Velocity ◽  
Microstructure Prediction

In this paper, a novel model combining the microstructure prediction model and a modified constitutive model of the Johnson-Cook (JC) model was developed and embedded into FEM software via the user subroutine. The chip formation and microstructure evolution in high speed cutting of Ti-6Al-4V alloy were simulated. The results indicated that dynamic recrystallization mainly happened in adiabatic shear bands (ASBs), where the grain size had a big decline. Then FEM simulations were carried out to investigate the effect of cutting velocity, uncut chip thickness, and the rake angle on the ASBs width of the serrated chips. It can be concluded that the width of ASB increases with the increasing of cutting depth and cutting velocity, and decreases with the increasing of rake angle of the tool.

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