Experimental evaluation of the double torsion analysis on soda-lime glass

Madjoubi, M. A.; Hamidouche, M.; Bouaouadja, N.; Chevalier, Jérôme; Fantozzi, Gilbert

doi:10.1007/s10853-007-1660-4

Cited by 15 publications

(18 citation statements)

References 16 publications

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“…Chevalier's and Ciccotti's corrections were derived for analysis of load relaxation tests, however, since the fracture toughness is obtained at a maximum load, their correction methodologies can be used. In agreement with Madjoubi [30], Chevalier's correction generally gives an overestimation in SIF due to the exponent value. Ciccotti's correction on the other hand decreases the SIF.…”

Section: Crack Length Independencesupporting

confidence: 79%

“…Their correction results in a shift of the VK curve and an increase of the stress corrosion index n [30]. Crack velocities are found using equations (11) or (13).…”

Section: Chevaliers' Correctionmentioning

confidence: 99%

“…Ciccotti's corrected compliance, which aims to provide a crack length independent geometry, did not agree with experimental data. The non linearity of the compliance has been attributed to the deformation of the unbroken ligament [14,30], which introduces error in the prediction of torsional deformation of the broken ligaments. The direct measurement of surface displacements by two-camera DIC (Fig.…”

Section: Compliance Relationshipmentioning

confidence: 99%

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An Evaluation of the Double Torsion Technique

2011

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Double Torsion (DT) is a powerful testing technique for fracture mechanics characterisation of brittle materials as, in principle, it provides a crack length independent test configuration. However, several corrections have been proposed to address variations of experimental results reported from various laboratories. These correction factors address the validity of the DT configuration and its crack length independent stress intensity. Never the less, there seems to be no consensus in literature on the various corrections and the reason of reported variations. This paper presents firstly a critical review of the DT technique, followed by proposed corrections through an experimental analysis using the proposed corrections, a Finite Element model of the geometry and the use of Digital Image Correlation to measure out-of-plane surface deformations. It focuses on the validity of the constant stress intensity regime and the independence of crack length in a critical evaluation using Polymethylmethacrylate test specimens. Assessment of three un-grooved specimen geometry configurations demonstrated the apparent regime of approximately constant stress intensity, although a small but clear dependence of the stress intensity on crack length was observed in all specimen configurations. This dependence is attributable to significant load-point deflections and out-of plane deformations that are not accounted for in the DT analysis. Revisions of the proposed analysis methodologies show that a crack length independent specimen geometry can be achieved, however at the cost of less accurate data. Reliable and accurate data can be achieved with a DT testing configuration using an optimum specimen configuration.

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Section: Crack Length Independencesupporting

confidence: 79%

“…Their correction results in a shift of the VK curve and an increase of the stress corrosion index n [30]. Crack velocities are found using equations (11) or (13).…”

Section: Chevaliers' Correctionmentioning

confidence: 99%

Section: Compliance Relationshipmentioning

confidence: 99%

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An Evaluation of the Double Torsion Technique

2011

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“…By experiments with soda-lime glass, Madjoubi et al [30] reported that the applicability of equations for DT RLX method was satisfactory when the length of the specimen reached three times the width. Sano [31] reported that the stress intensity factor is independent of the crack length by showing the proportional relation between the compliance and the crack length in DT specimen of soda-lime glass, basalt and quartz andesite.…”

Section: Specimenmentioning

confidence: 99%

Effects of relative humidity and temperature on subcritical crack growth in igneous rock

Nara

Hiroyoshi

Yoneda

et al. 2010

International Journal of Rock Mechanics and Mining Sciences

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The effects of relative humidity and temperature on subcritical crack growth in igneous rock have been investigated experimentally on samples of Kumamoto andesite and Oshima granite. Stress intensity factors and crack velocities were measured using the double-torsion technique, and all experiments were conducted in moist air. Our results show that, in experiments conducted under the same relative humidity, crack velocity increased with increasing temperature, in agreement with previous studies. Our results also show that, in experiments conducted at the same temperature, crack velocity increased dramatically with increasing relative humidity. A three-to four-fold increase in relative humidity resulted in an increase in crack velocity of between one and four orders of magnitude. Such an increase is larger than that predicted by classical stress corrosion theory. It is suggested that capillary condensation of water vapour close to crack tips of small aperture influences the rate of crack growth. It is concluded that relative humidity needs to be controlled to avoid time-dependent weakening and extend the lifetime of structures in a rock mass.

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“…Additionally, based on their results, they used thicker specimens (W : d = 8 : 1) than those recommended by Evans et al (1974) or Atkinson (1979b) (Ciccotti et al 2000b(Ciccotti et al , 2001). Recently, Madjoubi et al (2007) reported that the applicability of Eqs. (1) and (2) was conditioned by using longer specimen by experiments with soda-lime glass.…”

Section: Experimental Methodsmentioning

confidence: 99%

Subcritical crack growth and long-term strength in rock and cementitious material

Nara

Takada

Mori³

et al. 2010

Int J Fract

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High-strength and ultra low-permeability concrete (HSULPC) is a strong candidate for a radioactive waste package containing transuranic radionuclides (TRU waste) for geological disposal. Knowledge of the time-dependent fracturing of HSULPC and surrounding rock mass is essential to assess the long-term stability of such underground repositories. We have measured crack velocity in andesite and HSULPC both in air and water to examine subcritical crack growth by the Double-Torsion method. In air, the crack velocity in andesite increased when the temperature and relative humidity increased. On the other hand, the temperature and relative humidity had little effect on the crack velocity in HSULPC in air. In water, the crack velocity increased when the temperature was higher for both andesite and HSULPC. Using these experimental results, the longterm strength was estimated. It was shown that the long-term strength of HSULPC was higher than that of andesite. In air, the long-term strength for andesite was affected by the temperature and relative humidity. The long-term strength for andesite decreased when the temperature or relative humidity increased. For HSULPC, the change of the long-term strength with varying temperature or relative humidity was smaller than andesite in air. In water, the long-term strength for both materials decreased with increasing the temperature. Comparing the longterm strength of andesite and HSULPC at the same environmental conditions, it was recognized that the decrease of the long-term strength of HSULPC is smaller than that of andesite. The long-term strength in water was smaller than that in air for both materials.

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Experimental evaluation of the double torsion analysis on soda-lime glass

Cited by 15 publications

References 16 publications

An Evaluation of the Double Torsion Technique

An Evaluation of the Double Torsion Technique

Effects of relative humidity and temperature on subcritical crack growth in igneous rock

Subcritical crack growth and long-term strength in rock and cementitious material

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