Tensile behaviour of corroded steel bars under different strain rates

2016 ◽  
Vol 68 (3) ◽  
pp. 127-140 ◽  
Author(s):  
Wei-ping Zhang ◽  
Hui Chen ◽  
Xiang-lin Gu
Keyword(s):  
Tensile Behaviour ◽  
Strain Rates ◽  
Steel Bars

Dynamic Behaviour of Reinforcing Steel Bars in Tension

2011 ◽  
Vol 82 ◽  
pp. 86-91 ◽  
Author(s):  
Ezio Cadoni ◽  
Matteo Dotta ◽  
Daniele Forni ◽  
Nicoletta Tesio
Keyword(s):  
Testing Machine ◽  
Maximum Load ◽  
Gauge Length ◽  
Strain Rates ◽  
Reinforcing Bars ◽  
Static Tests ◽  
Split Hopkinson Tensile Bar ◽  
Steel Bars ◽  
Split Hopkinson ◽  
Reinforced Steel

In this paper the preliminary results of the tensile behavior of reinforced steel in a large range of strain rates are presented. Tensile testing at several strain rates, using different experimental set-ups, was carried out. For the quasi-static tests a universal electromechanical testing machine with the maximum load-bearing capacity of 50 kN was used, while for the intermediate and high-strain rate regimes a hydro-pneumatic apparatus and a JRC-Split Hopkinson Tensile Bar respectively were used. The target strain rates were set at the following five levels: 10-3, 30, 250, 500, and 1000 1/s. The specimens used in this research were round samples having 3mm in diameter and 5mm of gauge length obtained from reinforcing bars. Finally, the material parameters for Cowper-Symonds and Johnson-Cook models were determined.

Strain-Rate Effect on the Tensile Behaviour of High Strength Alloys

2011 ◽  
Vol 82 ◽  
pp. 124-129 ◽  
Author(s):  
Ezio Cadoni ◽  
Matteo Dotta ◽  
Daniele Forni ◽  
Stefano Bianchi
Keyword(s):  
Strain Rate ◽  
Rate Sensitivity ◽  
High Strength ◽  
Constitutive Law ◽  
Tensile Behaviour ◽  
Strain Rates ◽  
Cross Sectional ◽  
Split Hopkinson Tensile Bar ◽  
Wide Range ◽  
First Results

In this paper the first results of the mechanical characterization in tension of two high strength alloys in a wide range of strain rates are presented. Different experimental techniques were used for different strain rates: a universal machine, a Hydro-Pneumatic Machine and a JRC-Split Hopkinson Tensile Bar. The experimental research was developed in the DynaMat laboratory of the University of Applied Sciences of Southern Switzerland. An increase of the stress at a given strain increasing the strain-rate from 10-3 to 103 s-1, a moderate strain-rate sensitivity of the uniform and fracture strain, a poor reduction of the cross-sectional area at fracture with increasing the strain-rate were shown. Based on these experimental results the parameters required by the Johnson-Cook constitutive law were determined.

Strain Rate Effect on Progressive Failure and Tensile Behaviour of Kevlar Epoxy Composites

2020 ◽  
Vol 12 (4) ◽  
Author(s):  
C. Ganesan ◽  
P.S. Joanna ◽  
Dalbir Singh
Keyword(s):  
Mechanical Properties ◽  
Progressive Failure ◽  
Axial Loading ◽  
Experimental Tests ◽  
Strain Rate Effect ◽  
Matrix Cracking ◽  
Epoxy Composites ◽  
Tensile Behaviour ◽  
Strain Rates ◽  
The Difference

This study investigates about the effect of different strain rates on the tensile behaviour of kevlar epoxy composites and progressive failure of kevlar epoxy composites under displacement controlled axial loading. A series of experimental tests were conducted under different strain rates to find out the tensile behaviour of kevlar epoxy composites. Two different strain rates 0.5mm/ min and 1.5mm/ min were applied to the kevlar epoxy specimen in order to understand the difference in mechanical properties and progressive failures of composites. Tensile strength increases with an increase in strain rates. Failure in kevlar epoxy composites is analysed under different stages for both 0.5mm/min and 1.5 mm/min. For all the tests, failure starts with matrix cracking followed by delamination and ends with fracture.

Experimental study on direct tensile behaviour of UHPFRC under high strain-rates

2019 ◽  
Vol 218 ◽  
pp. 667-680 ◽  
Author(s):  
Ezio Cadoni ◽  
Daniele Forni ◽  
Emmanuel Bonnet ◽  
Svatopluk Dobrusky
Keyword(s):  
Experimental Study ◽  
High Strain ◽  
Tensile Behaviour ◽  
Strain Rates ◽  
High Strain Rates ◽  
Direct Tensile

Superplasticity and Superplastic Tensile Behaviour of AA5083

2014 ◽  
Vol 902 ◽  
pp. 24-28 ◽  
Author(s):  
B. Yogesha ◽  
H.V. Divya ◽  
S.S. Bhattacharya
Keyword(s):  
Superplastic Deformation ◽  
Polycrystalline Materials ◽  
Uniaxial Tensile ◽  
Tensile Behaviour ◽  
Uniaxial Tensile Test ◽  
Strain Rates ◽  
Analytical Characterization ◽  
Structural Superplasticity ◽  
Aa5083 Alloy

In the present investigation experimental and analytical characterization of the high temperature (superplastic) deformation of AA5083 alloy was carried out. Uniaxial tensile test was performed in a temperature range of 748 823K at different initial strain rates. Superplasticity is the ability of polycrystalline materials to exhibit, in a relatively uniform/isotropic manner, very large tensile elongations prior to failure, under appropriate conditions of temperature and strain rates. The phenomenon of superplasticity arising due to specific microstructural conditions is commonly referred to as "structural" superplasticity or "micrograin" superplasticity.

Bond behaviour between corroded steel bars and concrete under different strain rates

2016 ◽  
Vol 68 (7) ◽  
pp. 364-378 ◽  
Author(s):  
Wei-Ping Zhang ◽  
Hui Chen ◽  
Xiang-Lin Gu
Keyword(s):  
Strain Rates ◽  
Bond Behaviour ◽  
Steel Bars

Performance of Nylon Based Polymer Foams at Elevated Temperature under Tensile Loading

2011 ◽  
Vol 488-489 ◽  
pp. 286-289
Author(s):  
V.G. Izzard ◽  
C.H. Bradsell ◽  
H. Hadavinia ◽  
V.J. Morris ◽  
P.J.S. Foot ◽  
...  
Keyword(s):  
Glass Transition ◽  
Elastic Modulus ◽  
Elevated Temperatures ◽  
Compressive Strain ◽  
Tensile Behaviour ◽  
Strain Rates ◽  
Polymer Foams ◽  
Polymeric Foams ◽  
Highly Nonlinear ◽  
Wide Range

One of the primary applications of polymer based cellular solids is to act as an energy absorbing material during impact where compressive strain rates may reach 500-800/s. In reality, impacts occur over a wide range of temperatures and velocities at different angles of incidence. Understanding and modelling the behaviour of the polymer foams requires characterisation of the material response in detail. The stress-strain response that covers both compressive and tensile behaviour for a wide range of strain rates and temperatures are needed to characterize the mechanical performance of polymer foams as polymeric foams are highly nonlinear materials that undergo large deformation in crashworthiness related cases. It is reported in literature that any increase or decrease in temperature over the glass transition region can cause changes by order of magnitude in elastic modulus of polymeric foams. However, creation of cross linking at high temperature can affect the elastic modulus. In this work, the behaviour of two, polyamide-6 (PA-6) based closed cell foams at elevated temperatures were investigated covering the glass transition temperature. This work presents the variation of elastic and tangent modulus of two low densities PA-6 and PA-6/polyolefin (Nylon alloy) based foams. Empirical equations have been proposed to allow the prediction of modulus over a temperature range of 23°C to 120°C for these materials.

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