Experimental and numerical investigation on the dumbbell-shaped specimen of concrete-like materials under tension

Zhang, Shu; Lu, Yao

doi:10.1590/1679-78254632

Cited by 9 publications

(4 citation statements)

References 8 publications

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“…Commonly used load transfer methods include adhesive bonding, anchoring/clamping and friction grip, each of which presents particular challenges. Zhang and Lu (2018) noted that stress concentration on specimen interfaces is unavoidable with clamping connection or adhesive bonding. Al-Hussaini and Townsend (1974) indicated that the difference in the physical properties of the adhesive and the specimen causes uneven deformation and eventual failure at the interface of these materials.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Test Methods for Determining the Tensile Strength of Soil and Weak Rocks

Wang

et al. 2022

Front. Earth Sci.

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Tensile strength is a key parameter governing tensile cracking and subsequent failure of soil or rock mass. Existing methods for measuring tensile strength are mainly designed for hard materials and come with inherent problems. As such, they are continuously being adapted and improved by the scientific community. In line with this effort, we recently developed two new tensile test methods for application to soil and weak rocks, namely, the inner hole fracturing test (IHFT) and horizontal compression test (HCT). In this study, we compared the performance of these newly developed methods and the three most commonly used approaches for tensile strength determination, namely, the uniaxial direct tensile test (UDTT), Brazilian test (BT) and three-point bending test (TPBT). Results show that IHFT and HCT exhibit distinct advantages over the three conventional methods when testing soil and weak rocks: first, IHFT and HCT can overcome the eccentric force problem that is a main challenge in UDTT and BT, and second, results obtained from these tests are highly reproducible and stable. Between IHFT and HCT, the latter is found more suitable for routine laboratory testing because of simpler and easier procedure, more stable and reliable results and uniform stress distribution within specimens.

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Section: Discussionmentioning

confidence: 99%

Comparison of Test Methods for Determining the Tensile Strength of Soil and Weak Rocks

Wang

et al. 2022

Front. Earth Sci.

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“…As an example, use of the dog-bone (or dumbbell) shaped rock specimens for effective holding is among various DTS testing methods. However, the dog-bone shaped specimens are not widely used as a result of impractical preparation details [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Water Saturation Induced Changes in the Indirect (Brazilian) Tensile Strength and the Failure Mode of Some Igneous Rock Materials

Yasar

Komurlu

2020

GSE

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The present study concentrates on water induced strength reduction and variation of the failure mode in indirect (Brazilian) tension tests of several igneous rock materials under three moisture cases of ovendry, air-dry and fully saturated states. In this respect, two andesite and three tuff materials which contain no visible flaws were subjected to indirect tensile strength tests using the Brazilian disc method. Once the tension tests were carried out, photographs of the broken samples were taken to investigate the changes in the failure mode. As a result, it was found that tensile strengths of the samples were highly reduced with the presence of the water and the natural humidity. Additionally, it has been deduced that the failure mode of the samples mainly shifts to central fracturing with the presence of natural moisture and saturation. Although the central crack is the ideal type for the theory of Brazilian tensile strength determination, indefinite contact properties like contact angle and frictions are some notable issues to make only considering failure shapes for the validity of the test results misleading.

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“…For instance, different DTS test methods like using dog‐bone (or dumbbell)–shaped rock specimens have been developed for effective holding. However, the use of dog‐bone–shaped specimens are not popular because of its impractical specimen preparation works 1–4 …”

Section: Introductionmentioning

confidence: 99%

Investigation of a new drilling design for loading core specimens with triple holes to determine direct tensile strength values of rock materials

Komurlu

Demir

2020

Mat Design & Process Comms

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Drilled core specimens including a reaming and two loading holes were investigated with both numerical and experimental studies to assess its usability to determine direct tensile strength values of rock materials. A new loading apparatus with rods to insert into the loading holes has been designed and manufactured to supply tension. Elimination of the gluing in the standard direct tensile strength test method is a significant advantage to make both hard and soft rocks possible to be tested. The cylindrical specimens with the diameter of NX size and length to diameter ratio of 3 were used in the tests. In this test method, reaming holes with higher diameter than that of the loading holes were drilled at the middle length of the specimens as the target location for the crack initiation. However, the drilled discs were determined to fail because of the crack initiation at sidewalls of loading holes, instead of the reaming hole. Therefore, loading with inserted rods was not found applicable. The test method and its failure mechanism were discussed for the aim of contributing to relevant studies.

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Experimental and numerical investigation on the dumbbell-shaped specimen of concrete-like materials under tension

Cited by 9 publications

References 8 publications

Comparison of Test Methods for Determining the Tensile Strength of Soil and Weak Rocks

Comparison of Test Methods for Determining the Tensile Strength of Soil and Weak Rocks

Water Saturation Induced Changes in the Indirect (Brazilian) Tensile Strength and the Failure Mode of Some Igneous Rock Materials

Investigation of a new drilling design for loading core specimens with triple holes to determine direct tensile strength values of rock materials

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