Strain rate sensitivity of the tensile strength of two silicon carbides: experimental evidence and micromechanical modelling

Zinszner, Jean-Luc; Erzar, B.; Forquin, Pascal

doi:10.1098/rsta.2016.0167

Cited by 15 publications

(12 citation statements)

References 30 publications

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“…The threshold stress   is set to zero. The DFH model was previously successfully used to simulate the fragmentation process in SiC ceramics [16][17][18][19].…”

Section: Rockspall Testing Methodsmentioning

confidence: 99%

Numerical analysis of a testing technique to investigate the dynamic crack propagation in armour ceramic

et al. 2018

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Ceramic materials are numerically studied to understand their fracturing behaviour upon dynamic conditions and impact loadings. During a ballistic impact of a projectile against a ceramic armour system, an intense fragmentation composed of numerous oriented cracks, develops in the target. It is the reason why the conditions of crack initiation, propagation and arrest in these materials need to be investigated. In the present work, a dynamic testing configuration has been developed in order to characterise the dynamic fracture toughness (K1,d), considering a single crack that propagates from the specimen notch tip. The “Rockspall” testing technique, which employs a two-notch specimen loaded in a spalling experiment, was used. Thanks to the reflection of a compression wave into a tensile load from the sample free-end, a single dynamic crack is triggered. The sample geometry is optimised by means of a series of FE numerical simulations involving an anisotropic damage model.

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“…The threshold stress   is set to zero. The DFH model was previously successfully used to simulate the fragmentation process in SiC ceramics [16][17][18][19].…”

Section: Rockspall Testing Methodsmentioning

confidence: 99%

Numerical analysis of a testing technique to investigate the dynamic crack propagation in armour ceramic

et al. 2018

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“…The brittle-ductile failure transition mode has been investigated by several authors [64][65][66]. With regard to dynamic tensile loadings, the concept of obscuration zones driven by the propagation of cracks at limited crack speeds was proposed in the Denoual-Forquin-Hild (DFH) model [67,68] in order to describe the multiple-fragmentation process occurring in brittle materials at high strain rates (above a few thousands per second in ceramics [14] and above a few tens per second in geomaterials [17,[31][32][33]69]). Whereas a single crack will initiate at the weakest defect in the sample, and propagate through the sample when loaded quasi-statically or under low-strain-rate loadings, a large number of cracks will initiate and propagate from numerous defects at high-strain-rate loadings producing a multiple fragmentation of the sample.…”

Section: Modelling and Numerical Methods Dedicated To Brittle Materialsmentioning

confidence: 99%

“…The DFH model enables the description of a probabilistic size-dependent and strain-rate insensitive tensile strength of brittle materials at low strain rate, whereas their behaviour becomes deterministic size-independent and strain-rate sensitive at high strain rates as illustrated in figure 5. This model was applied in this theme issue to the fragmentation of SiC ceramic materials subjected to spalling [14] and EOI tests [43].…”

Section: Modelling and Numerical Methods Dedicated To Brittle Materialsmentioning

confidence: 99%

“…This technique was used by Zhang et al [39] to characterize the shock responses of a fine-grained marble and a coarse-grained gabbro over a shock pressure range of approximately 1. [14]. (b) Edge-on impact test performed on SPS-L SiC ceramic and X-ray tomography post-mortem analysis.…”

Section: Experimental Techniques Devoted To Brittle Materialsmentioning

confidence: 99%

“…10 3 -10 6 s −1 according to LaLone & Gupta [41] and Zinszner [42]). More recently, this testing facility was used to investigate the tensile strength of an alumina ceramic [13], two SiC ceramics [14] ( figure 3a) and an ultra-high-performance concrete [23].…”

Section: Experimental Techniques Devoted To Brittle Materialsmentioning

confidence: 99%

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

Forquin¹

2017

Phil. Trans. R. Soc. A.

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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’.

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