Controlled single and repeated impact testing for material plastic behaviour characterisation under high strain rates

Strain ◽  
2021 ◽  
Author(s):  
Simon Breumier ◽  
Francis Trudeau‐Lalonde ◽  
Thierry Lafrance ◽  
Etienne Robert ◽  
Aurélien Villani ◽  
...  
Keyword(s):  
High Strain ◽  
Impact Testing ◽  
Strain Rates ◽  
High Strain Rates ◽  
Repeated Impact ◽  
Plastic Behaviour

Modelling of the Ship Structural Ballistic Shields from the 10GHMBA Steel

2011 ◽  
Vol 180 ◽  
pp. 303-312
Author(s):  
Wojciech Jurczak ◽  
Lesław Kyzioł
Keyword(s):  
High Strain ◽  
Terrorist Attack ◽  
Testing Machine ◽  
Impact Testing ◽  
Strain Rates ◽  
High Strain Rates ◽  
Critical Elements ◽  
Hull Structure ◽  
Ballistic Pendulum ◽  
Protective Structures

The contemporary protective structures are now critical elements of the floating units, military, public and other objects. Their task is to weaken the effects of a terrorist action against selected areas with the use of explosives or projectiles. The knowledge of material behaviour at high strain rates is essential for designing the ballistic shields. The hull external shells of the Polish Navy ships now in service do not meet the requirements of ballistic anti-terrorist shields against small arms shooting or the rocket and shell splinters. This is a significant problem in the case of defending a ship against terrorist attack threats. Therefore, there is a tendency for building internal and external ballistic shields in the ship hull structure to protect the critical compartments and action stations. The paper presents investigations of materials subjected to high strain rates, with the 10GHMBA E-620 bainitic steel as an example. The experiments were carried out on the MTS 810.12 testing machine, rotary impact testing hammer, the Taylor test stand and on the ballistic pendulum. In the final part of the paper, some numerical simulations are presented allowing to analyse the fast-changing processes arising during loading the structure by an impact of high velocity bodies.

scholarly journals Brittle materials at high-loading rates: an open area of research

2017 ◽  
Vol 375 (2085) ◽  
pp. 20160436 ◽  
Author(s):  
Pascal Forquin
Keyword(s):  
Strain Rate ◽  
High Strain ◽  
Concrete Structures ◽  
Brittle Materials ◽  
Impact Testing ◽  
High Loading ◽  
Strain Rates ◽  
High Strain Rates ◽  
Loading Rates ◽  
Complex Features

Brittle materials are extensively used in many civil and military applications involving high-strain-rate loadings such as: blasting or percussive drilling of rocks, ballistic impact against ceramic armour or transparent windshields, plastic explosives used to damage or destroy concrete structures, soft or hard impacts against concrete structures and so on. With all of these applications, brittle materials are subjected to intense loadings characterized by medium to extremely high strain rates (few tens to several tens of thousands per second) leading to extreme and/or specific damage modes such as multiple fragmentation, dynamic cracking, pore collapse, shearing, mode II fracturing and/or microplasticity mechanisms in the material. Additionally, brittle materials exhibit complex features such as a strong strain-rate sensitivity and confining pressure sensitivity that justify expending greater research efforts to understand these complex features. Currently, the most popular dynamic testing techniques used for this are based on the use of split Hopkinson pressure bar methodologies and/or plate-impact testing methods. However, these methods do have some critical limitations and drawbacks when used to investigate the behaviour of brittle materials at high loading rates. The present theme issue of Philosophical Transactions A provides an overview of the latest experimental methods and numerical tools that are currently being developed to investigate the behaviour of brittle materials at high loading rates. This article is part of the themed issue ‘Experimental testing and modelling of brittle materials at high strain rates’.

Ductility of aluminium alloy AA7075 at high strain rates

2000 ◽  
Vol 10 (PR9) ◽  
pp. Pr9-335-Pr9-340 ◽  
Author(s):  
E. El-Magd ◽  
M. Brodmann
Keyword(s):  
Aluminium Alloy ◽  
High Strain ◽  
Strain Rates ◽  
High Strain Rates
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