Tensile strength of aluminum-epoxy resin composite structure under high strain rate conditions

2012 ◽  
Author(s):  
Damien Laporte ◽  
Frederic Malaise ◽  
Michel Boustie ◽  
Jean-Marc Chevalier ◽  
Eric Buzaud
Keyword(s):  
Tensile Strength ◽  
High Strain Rate ◽  
Strain Rate ◽  
Epoxy Resin ◽  
Composite Structure ◽  
High Strain ◽  
Resin Composite ◽  
Epoxy Resin Composite

scholarly journals An Image-Based Impact Test for the High Strain Rate Tensile Properties of Brittle Materials

2018 ◽  
Vol 183 ◽  
pp. 02042
Author(s):  
Lloyd Fletcher ◽  
Fabrice Pierron
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
High Strain Rate ◽  
Strain Rate ◽  
Stress Wave ◽  
High Strain ◽  
Brittle Materials ◽  
Test Method ◽  
Strain Rates ◽  
High Strain Rates

Testing ceramics at high strain rates presents many experimental diffsiculties due to the brittle nature of the material being tested. When using a split Hopkinson pressure bar (SHPB) for high strain rate testing, adequate time is required for stress wave effects to dampen out. For brittle materials, with small strains to failure, it is difficult to satisfy this constraint. Because of this limitation, there are minimal data (if any) available on the stiffness and tensile strength of ceramics at high strain rates. Recently, a new image-based inertial impact (IBII) test method has shown promise for analysing the high strain rate behaviour of brittle materials. This test method uses a reflected compressive stress wave to generate tensile stress and failure in an impacted specimen. Throughout the propagation of the stress wave, full-field displacement measurements are taken, from which strain and acceleration fields are derived. The acceleration fields are then used to reconstruct stress information and identify the material properties. The aim of this study is to apply the IBII test methodology to analyse the stiffness and strength of ceramics at high strain rates. The results show that it is possible to identify the elastic modulus and tensile strength of tungsten carbide at strain rates on the order of 1000 s-1. For a tungsten carbide with 13% cobalt binder the elastic modulus was identified as 516 GPa and the strength was 1400 MPa. Future applications concern boron carbide and sapphire, for which limited data exist in high rate tension.

Alumina nanoparticle filled epoxy resin: High strain rate compressive behavior

2014 ◽  
Vol 54 (12) ◽  
pp. 2896-2901 ◽  
Author(s):  
N.K. Naik ◽  
Kedar S. Pandya ◽  
V.R. Kavala ◽  
W. Zhang ◽  
N.A. Koratkar
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Epoxy Resin ◽  
High Strain ◽  
Compressive Behavior ◽  
Alumina Nanoparticle

Research on compression properties of unidirectional carbon fiber reinforced epoxy resin composite (UCFREP)

2020 ◽  
pp. 002199832097217
Author(s):  
Zhao Changfang ◽  
Zhou Zhitan ◽  
Zhao Changxing ◽  
Zhu Hongwei ◽  
Zhang Kebin ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Strain Rate ◽  
Epoxy Resin ◽  
Compression Strength ◽  
Resin Composite ◽  
Dynamic Compression ◽  
Compression Failure ◽  
Compression Properties ◽  
Epoxy Resin Composite ◽  
Shear Cracking

To research the axial compression properties of unidirectional carbon fiber reinforced epoxy resin composite (UCFREP), the compression experiments at different strain rates were carried out by using the MTS universal electronic testing machine and the equipment of split Hopkinson pressure bar (SHPB). Furthermore, the finite element analysis (FEA) was also used to study the compression properties of UCFREP with different conditions. The true stress-strain curves in quasi-static and dynamic compression were obtained, and the relationship between yield limit and strain rate was coupled. The microstructure of the failure area was observed by scanning electron microscope (SEM). A formula for predicting compression strength of combined buckling under the quasi-static condition was presented. The application range of Chang-Chang failure criterion was discussed by FEA, and the compression failure of UCFREP with different fiber directions was predicted. The results show that UCFREP has the obvious strain rate effect, the mechanical properties at dynamic compression are nonlinear. Shear is the main compression failure mode, which includes the shear cracking of matrix between fibers and the shear buckling of fiber. The direction of the fiber is the main factor that causes the shear cracking, such as the shear cracking shows the feature of 45° when the direction of the fiber is 45°. As a conclusion, increasing the shear strength of matrix and fiber will be a way to increase the compression strength of UCFREP. This paper could be used as a reference to develop the new constitutive model, especially considering the nonlinear effect.

High-strain rate compressive behavior of multi-walled carbon nanotube dispersed thermoset epoxy resin

2014 ◽  
Vol 49 (8) ◽  
pp. 903-910 ◽  
Author(s):  
Niranjan K Naik ◽  
Kedar S Pandya ◽  
Venkateswara R Kavala ◽  
Wei Zhang ◽  
Nikhil A Koratkar
Keyword(s):  
Carbon Nanotube ◽  
High Strain Rate ◽  
Strain Rate ◽  
Epoxy Resin ◽  
High Strain ◽  
Compressive Behavior ◽  
Multi Walled Carbon Nanotube ◽  
Thermoset Epoxy

scholarly journals High Strain Rate Tensile Properties of Annealed 2 1/4 Cr-1 Mo Steel

1976 ◽  
Vol 98 (4) ◽  
pp. 361-368 ◽  
Author(s):  
R. L. Klueh ◽  
R. E. Oakes
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
High Strain Rate ◽  
Strain Rate ◽  
Tensile Properties ◽  
Elevated Temperatures ◽  
High Strain ◽  
Total Elongation ◽  
Major Effect ◽  
Dynamic Strain

The high strain rate tensile properties of annealed 2 1/4 Cr-1 Mo steel were determined and the tensile behavior from 25 to 566°C and strain rates of 2.67 × 10−6 to 144/s were described. Above 0.1/s at 25°C, both the yield stress and the ultimate tensile strength increased rapidly with increasing strain rate. As the temperature was increased, a dynamic strain aging peak appeared in the ultimate tensile strength-temperature curves. The peak height was a maximum at about 350°C and 2.67 × 10−6/s. With increasing strain rate, a peak of decreased height occurred at progressively higher temperatures. The major effect of strain rate on ductility occurred at elevated temperatures, where a decrease in strain rate caused an increase in total elongation and reduction in area.

scholarly journals Mechanical characterization of 3D printed concrete subjected to dynamic loading

2021 ◽  
Vol 250 ◽  
pp. 01009
Author(s):  
Rosanna Napolitano ◽  
Costantino Menna ◽  
Daniele Forni ◽  
Domenico Asprone ◽  
Ezio Cadoni
Keyword(s):  
Tensile Strength ◽  
High Strain Rate ◽  
Strain Rate ◽  
Waiting Time ◽  
High Strain ◽  
Waiting Times ◽  
Digital Fabrication ◽  
Tensile Tests ◽  
Experimental Program ◽  
3D Printed

In concrete structures realized by digital fabrication techniques, such as 3D concrete printing, under severe dynamic loadings (e.g. earthquakes and impact loads), the strength at the bond interfaces between layers is weak. Since these contact zones, also referred as cold joint, could potentially compromise the structural stability and also the durability of printed elements, their behaviour under high dynamic loads is fundamental to investigate. An experimental program on 3D printed concrete elements varying the waiting time, through medium and high strain-rate tensile tests is running, with a Hydro-Pneumatic Machine and a modified Hopkinson tensile bar respectively. The results of dynamic tensile tests at three different strain rates (10-5, 50 and 200 s-1) on 3D printed cementitious elements for waiting times of 0min, 10min and 30 min have been presented, in terms of Dynamic increase factors DIF versus strain rate, showing a behaviour highly strain-rate sensitive, recording an increase in tensile strength DIF up to 7.6 in the case of high strain-rate and waiting time of 30 min. The results exhibited a decrease in the dynamic interface tensile strength with the waiting time up to over 90% for a medium strain-rate and over 20% for a high strain-rate.

The tensile strength of pultruded carbon fibre/epoxy resin composite

Composites ◽  
1973 ◽  
Vol 4 (5) ◽  
pp. 227-228 ◽  
Author(s):  
J.J. Dibb ◽  
A.S. Wronski ◽  
B. Watson-Adams
Keyword(s):  
Tensile Strength ◽  
Carbon Fibre ◽  
Epoxy Resin ◽  
Resin Composite ◽  
Epoxy Resin Composite
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