Generalized Stress–Strain Curves for IBII Tests on Isotropic and Orthotropic Materials

Pierron, Fabrice; Fletcher, Lloyd

doi:10.1007/s40870-019-00197-9

Cited by 7 publications

(13 citation statements)

References 27 publications

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“…Apart from the theory of adiabatic heating in the vicinity of the crack tip resulting in lower K Ic values at high loading rates, it is also known that cobalt, like most metals with a face centered cubic microstructure, is very rate sensitive with the flow stress seen to be an increasing function of strain rate [11,12]. Therefore, the faster it is loaded, the more brittlely it behaves, and the rate dependency in the material is mainly due to the influence of the cobalt binder phase.…”

Section: Discussionmentioning

confidence: 99%

Fracture mechanisms of polycrystalline advanced ceramics

Petrović¹,

Mešić²

2020

PEN

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Polycrystalline advanced ceramics are synthetic products produced by sintering together selected ceramics grains in a metal matrix serving as a binder. In order to be able to propose their optimization, achieving high performance cutting and leading to reduced operating costs and improved working environment, relevant fracture mechanisms involved in their failure need to be determined. In this work, experimental results of plane strain fracture toughness obtained earlier on single-edge-V-notched-beam specimens were supported with microscopy analysis. These findings establish a clear connection between the fracture toughness results and the fracture mechanisms visible on and beneath the fracture surfaces, revealing adiabatic conditions that occur at the crack tip during fracture.

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Section: Discussionmentioning

confidence: 99%

Fracture mechanisms of polycrystalline advanced ceramics

Petrović¹,

Mešić²

2020

PEN

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“…The most general approach is to use the generalized stress-strain curve procedure described in ref. [18]. However, the use of the generalized stress-strain curves requires that the kinematic fields are sufficiently heterogeneous to activate all terms in the equations.…”

Section: Rigid Body Virtual Fieldsmentioning

confidence: 99%

“…In the future it would be interesting to use more complex geometry in the test section to obtain a more heterogeneous stress-state. In this case the uniaxial assumption will not hold but it should be possible to design the test sample to have enough information to use the generalized stress-strain curve procedure described in [18].…”

Section: Dynamic Stiffness Identificationmentioning

confidence: 99%

“…The design process could be optimised using a parametric sweep of a suitable finite element model. A basic example of extending the IBIR test would be to use an off-axis unidirectional carbon fibre composite sample along with the analysis procedures described in [18,42] to obtain the in-plane transverse and shear modulus in the same test. It could even be extended to the full set of orthotropic stiffness components using a short open-hole off-axis specimen as in [40].…”

Section: Test Designmentioning

confidence: 99%

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The Image-Based Inertial Release (IBIR) Test: A New High Strain Rate Test for Stiffness Strain-Rate Sensitivity Identification

Fletcher

Pierron

2020

Exp Mech

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A key limitation of current moderate and high strain rate test methods is the need for external force measurement. For high loading rate hydraulic machines, ringing in the load cell corrupts the force measurement. Similarly, the analysis of split-Hopkinson bar tests requires the assumption that the specimen is in a state of quasi-static equilibrium. Recently, image-based inertial test methods have shown that external force measurement is not required if full-field measurements are available and inertial effects are significant enough. In this case the load information is provided by the acceleration fields which are derived from full-field displacement measurements. This article describes a new image-based inertial test method that can be used for simultaneous quasi-static and high strain rate stiffness identification on the same test sample. An experimental validation of the new test method is provided using PMMA samples. A major advantage of this new test method is that it utilises a standard tensile test machine and the only specialist equipment that is required is an ultra-high speed camera. Keywords High strain rate • Full-field measurements • Virtual fields method • Grid method • Polymers 493 Experimental Mechanics (2020) 0:-6 508

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“…[15] The idea of using the inertial component of a dynamic test through the sample unbalance state has been used for measuring uniaxial stress and strain response in several works using only imaging data. [16][17][18][19][20][21][22][23][24] Furthermore, some recent works propose data processing methods for a complete multiaxial stress reconstruction [25] and spatially resolved stress identification. [26] Although these works mark the beginning of a new approach to high strain rate testing of materials, most of them mainly focused on measuring material response in the elastic regime until the material fails.…”

Section: Introductionmentioning

confidence: 99%

Validation of the photomechanical spalling test in the case of non‐linear dynamic response: Application to a granite rock

Lukić

Saletti

Forquin

2020

Strain

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In this paper, the use of the virtual fields method for the identification of a strongly asymmetric compression-tension response of rock-like materials under dynamic tensile loading is investigated. The photomechanical spalling setup is used, which induces an indirect tensile load in a non-balanced sample, and the inertial component of the test is directly related to the measured dynamic stress with no previous assumption on the material behaviour. This experimental method provides a direct route to identifying the material asymmetric constitutive response in compression and tension under a uniaxial stress state as well as the material non-linear response after tensile strength is reached. To validate this approach, the entire measurement chain for the case of a post-peak response is investigated through simulated experiments that incorporate a damage model and synthetic grid images. Finally, the method is applied to the case of granite rock, namely, a Bohus granite, as to directly measure the material asymmetric compression-tension and the softening response after peak tensile stress. K E Y W O R D S damage, dynamic tension, simulated experiments, the grid method, the virtual fields method, ultra-high speed imaging

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Generalized Stress–Strain Curves for IBII Tests on Isotropic and Orthotropic Materials

Cited by 7 publications

References 27 publications

Fracture mechanisms of polycrystalline advanced ceramics

Fracture mechanisms of polycrystalline advanced ceramics

The Image-Based Inertial Release (IBIR) Test: A New High Strain Rate Test for Stiffness Strain-Rate Sensitivity Identification

Validation of the photomechanical spalling test in the case of non‐linear dynamic response: Application to a granite rock

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