Experimental investigation of thermally induced interacting cracks in brittle solids

Geyer, J.F.; Nemat-Nasser, S.

doi:10.1016/0020-7683(82)90059-2

Cited by 73 publications

(35 citation statements)

References 4 publications

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“…In Geyer's experiment [17], a glass plate uniformly heated to about 200°C was put into contact with dry ice (at -78°C). Seconds after contact, a few cracks suddenly shot up in a dynamic manner.…”

Section: Experimental Evidencementioning

confidence: 99%

Initiation of parallel cracks from surface of elastic half-plane

Hong

Bažant

1995

Int J Fract

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The paper deals with the problem of initiation of thermal or shrinkage cracks from the surface of a half plane. Linear elastic fracture behavior is assumed. The initial spacing and initial stable equilibrium length of parallel equidistant cracks emanating from the surface is determined from three conditions formulated in a preceding study of penetration of sea ice plate: (1) The stress at the surface reaches a given strength limit.(2) After the initial cracks form, the energy release rate equals its given critical value. (3) The finite energy release due to the initial crack jump equals the energy needed to form the crack (according to the given fracture energy of the material or fracture toughness). The problem is reduced to a singular integral equation which is solved numerically by Erdogan's method. The results of analysis appear to be compatible with the experimental evidence on thermal cracking in glass, and appear to give also reasonable predictions for thermal cracking on top of sea ice plates and shrinkage cracking in concrete.

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Section: Experimental Evidencementioning

confidence: 99%

Initiation of parallel cracks from surface of elastic half-plane

Hong

Bažant

1995

Int J Fract

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“…In this paper, we focus on the thermal shock problem of a brittle slab, for which experimental results are reported in Bahr et al (1986), Shao et al (2010), and Geyer and S.Nemat-Nasser (1982). The specimen is a thin slab, free at the boundary, composed of a homogeneous material without prestress in its initial configuration.…”

Section: Introductionmentioning

confidence: 99%

“…Examples of such a situation come from various fields: civil engineering with the drying of concrete (Bisschop and Wittel, 2011), mechanical engineering with the exposure of glass (Geyer and S.Nemat-Nasser, 1982) or ceramics to a thermal shock (Bahr et al, 2010;Shao et al, 2010), geomaterials with the drying of soils (Morris et al, 1992;Chertkov, 2002;Goehring et al, 2009) or colloidal suspensions (Gauthier et al, 2010), and the thermal shocks in overexploited gas storage caverns (Berest et al, 2012). These cracks are of importance as they can weaken the body or govern future diffusion process, modify the strength of the material (Shao et al, 2011) or compromise the safety of the structure.…”

Section: Introductionmentioning

confidence: 99%

Initiation of a periodic array of cracks in the thermal shock problem: A gradient damage modeling

Sicsic

Marigo

Maurini

2014

Journal of the Mechanics and Physics of Solids

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This paper studies the initiation of cracks in the thermal shock problem through the variational analysis of the quasi-static evolution of a gradient damage model. We consider a two-dimensional semi-infinite slab with an imposed temperature drop on its free surface. The damage model is formulated in the framework of the variational theory of rate-independent processes based on the principles of irreversibility, stability and energy balance. In the case of a sufficiently severe shock, we show that damage immediately occurs and that its evolution follows first a fundamental branch without localization. Then it bifurcates into another branch in which damage localization will take place to finally generate cracks. The determination of the time and mode of that bifurcation allows us to explain the periodic distribution of the so-initiated cracks and to calculate the crack spacing in terms of the material and loading parameters. Numerical investigations complete and quantify the analytical results.

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“…A series of studies have also been conducted to understand the mechanical and thermal behavior of thermally induced fractures and their interactions in brittle-elastic materials [9][10][11][12]. Nemat-Nasser et al [13] investigated stability of growing thermal fractures.…”

Section: Introductionmentioning

confidence: 99%

On Heat and Mass Transfer within Thermally Shocked Region of Enhanced Geothermal System

et al. 2017

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An Enhanced Geothermal System (EGS) is an artificially created geothermal reservoir formed by hydrofracturing hot dry rock. Thermal shock occurs when the cold water contacts the hot rock near the injection borehole, creating a network of small, disorganized, closely spaced micro cracks. As the cold-water injection continues, the hot rock cools down and the micro cracks coalesce, becoming a better-defined network of thermal fractures. Thermal fractures in an EGS reservoir are believed to improve reservoir performance by increasing the surface area for heat exchange and lowering flow impedance; however, it is difficult to precisely predict how they grow and affect the permeability of the reservoir. The goal of this paper is to provide an insight into the transport mechanisms within the thin, permeable, thermally shocked region of an EGS reservoir. COMSOL Multiphysics5 is used to set up an indealized porous region with identical geometrical features at different domain scales to show the scale dependence of heat and mass transport in the initial microscale crack network and in the later coalesced thermal fractures. This research shows the importance of EGS maturity in determining how heat and mass are transferred and how to select appropriate analytical tools for different stages of development.

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Experimental investigation of thermally induced interacting cracks in brittle solids

Cited by 73 publications

References 4 publications

Initiation of parallel cracks from surface of elastic half-plane

Initiation of parallel cracks from surface of elastic half-plane

Initiation of a periodic array of cracks in the thermal shock problem: A gradient damage modeling

On Heat and Mass Transfer within Thermally Shocked Region of Enhanced Geothermal System

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