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.

Mechanical Behavior of Advanced High Strength Steel at High Strain Rates

2011 ◽  
Vol 82 ◽  
pp. 178-183 ◽  
Author(s):  
Nilamber Kumar Singh ◽  
Ezio Cadoni ◽  
Maloy K. Singha ◽  
Narinder K. Gupta
Keyword(s):  
Mechanical Behavior ◽  
High Strength Steel ◽  
High Strain ◽  
Testing Machine ◽  
High Strength ◽  
Strain Rates ◽  
Advanced High Strength Steel ◽  
High Strain Rates ◽  
Loading Rates ◽  
Universal Testing

This paper presents the mechanical behavior of advanced high strength steel, Dual Phase 1200 steel (DP1200) at high strain rates (250s-1- 750s-1) under tensile loading. The mechanical behavior of materials depends on the loading rates. The accurate knowledge of the mechanical behavior of materials at high strain rates is essential in order to improve the safety against crash, impacts and blast loads. High strain rate experiments are performed on modified Hopkinson bar (MHB) apparatus; however, some quasi-static (0.001s-1) tests are also conducted on electromechanical universal testing machine at tensile loads. Based on the experimental results, the material parameters of the existing Cowper-Symonds and Johnson-Cook models are determined. These models fit the experimental data well and hence can be recommended for the numerical simulation of the problems involving this material at high strain rates.

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

Dynamic Characteristics of the Sinter-Forged Cu-Cr Alloys with the Variation of Chrome Content

2006 ◽  
Vol 116-117 ◽  
pp. 255-258
Author(s):  
Jung Han Song ◽  
Hoon Huh
Keyword(s):  
Dynamic Response ◽  
Dynamic Characteristics ◽  
High Speed ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Testing Machine ◽  
Impact Behavior ◽  
Stress Wave Propagation ◽  
Strain Rates ◽  
High Strain Rates

This paper is concerned with the dynamic characteristics of sinter-forged Cu–Cr alloy for various strain-rates. The amount of the chrome content is varied from 10 %wt to 30 %wt in order to investigate the influence of the chrome content on the dynamic characteristics. The dynamic response at the corresponding level of strain-rate should be obtained with an adequate experimental technique and corresponding apparatus due to the inertia effect and the stress wave propagation. In this paper, the high speed tensile testing machine is utilized in order to identify the dynamic response of the Cu–Cr alloy at the intermediate strain-rates and the split Hopkinson pressure bar is used at the high strain-rates. Experimental results from both the quasi-static and the high strain-rates up to the 5000/s are interpolated with respect to the amount of the chrome content in order to construct the Johnson–Cook and the modified Johnson–Cook model as the constitutive relation for numerical simulation of the dynamic impact behavior of electrodes.

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’.

Material Behaviors of PBX Simulant with Various Strain Rates

2013 ◽  
Vol 535-536 ◽  
pp. 117-120 ◽  
Author(s):  
Chung Hee Park ◽  
Seh Wan Jeong ◽  
Hoon Huh ◽  
Jung Su Park
Keyword(s):  
Strain Hardening ◽  
High Speed ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Testing Machine ◽  
Materials Testing ◽  
Strain Rates ◽  
High Strain Rates ◽  
Material Behaviors ◽  
Compressive Tests

This paper is concerned with the material behaviors of PBX(Polymer Bonded eXplosive) simulant at various strain rates ranging from 0.0001/sec to 3150/sec. Material behaviors of PBX at the high strain rates are important in the prediction of deformation modes of PBX in a warhead which undergoes severe impact loading. Inert PBX stimulant which has analogous material behaviors with PBX was utilized for material tests due to safety issues. Uniaxial compressive tests at quasi-static and intermediate strain rates were conducted with cylindrical specimen using a dynamic materials testing machine, INSTRON 8801. Uniaxial compressive tests at high strain rates ranging from 1200/sec to 3150/sec were conducted using a split Hopkinson pressure bar. Deformation behaviors were investigated using captured images obtained from a high-speed camera. The strain hardening behaviors of PBX simulant were formulated by proposed strain rate-dependent strain hardening model.

scholarly journals Experimental characterization of dynamic deformation behaviour for SCM440 steel at high strain rates

2018 ◽  
Vol 183 ◽  
pp. 02019
Author(s):  
Keunho Lee ◽  
Yerim Lee ◽  
Sanghyun Woo ◽  
Changsoo Lee ◽  
Leeju Park
Keyword(s):  
High Strain ◽  
Dynamic Deformation ◽  
Deformation Behaviour ◽  
Testing Machine ◽  
Experimental Tests ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Strain Rates ◽  
Hopkinson Pressure Bar ◽  
High Strain Rates

The dynamic deformation behaviours of SCM 440 steel were characterized at the strain rates from 10-3 s-1 to 106 s-1. The uniaxial tensile tests at different temperature of 25 °C, 350 °C, and 700 °C were performed by a hydraulic universal testing machine equipped with a heating stage, and the compressive tests were conducted by using a spilt Hopkinson pressure bar (SHPB) at room temperature. Material coefficients of the Johnson-Cook constitutive model considering temperature effects were obtained based on the stressstrain relations from the experimental tests. In addition, Taylor impact tests on the SCM 440 steel were carried out to evaluate the accuracy of the determined material coefficients and characterize the dynamic behavior at the ultra-high strain rates and high temperature, by comparison with numerical simulations.

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