An Experimental Study on Determination of Crack Propagation Energy of Rock Materials under Dynamic (Impact) and Static Loading Conditions

Komurlu, Eren

doi:10.17350/hjse19030000126

Cited by 4 publications

(4 citation statements)

References 41 publications

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“…Finding the increase of the UCS values with an increase in loading rate is parallel with the results obtained from other previous studies carried out by different researchers [13][14][15][16][17]. Under a load controlled rate (kN/s), change in the size causes also a change in the strain rate (s −1 ) that a decrease of the size makes an increase in the rate value.…”

Section: Discussionsupporting

confidence: 87%

“…In the UCS tests of rock materials, the loading rate is many times load control selected with the unit of kN/s. It is known that the increase in the loading rate makes also an increase in the UCS values [13][14][15][16][17]. Big size specimens tested under a same load controlled rate (kN/s) have lower deformation rates (mm/min) and strain rates (s −1 ) which cause to measure lower UCS values than those of the specimens with smaller sizes.…”

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confidence: 99%

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Loading rate conditions and specimen size effect on strength and deformability of rock materials under uniaxial compression

Komurlu

2018

Geo-Engineering

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Determination of the uniaxial compressive strength (UCS), one of the most crucial inputs in rock engineering design works is detailed in different standards and suggestions by the International Society for Rock Mechanics and Rock Engineering (ISRM). The relevant standards and suggestions include some statements to select appropriate values of different parameters like geometry, size and loading rate. As ideal geometry of the UCS test specimens, length to diameter (L/D) ratio of the cylindrical specimens is suggested to be 2-2.5 by ASTM (American Society for Testing and Materials) and TSE (Turkish Standards Institution). On the other hand, the ratio should be 2.5-3 according to ISRM suggestions [1][2][3]. The geometry effect on the UCS values is one of the wellstudied topics in rock testing. It is known that an increase in the ratio of length to diameter of the cylindrical core specimens make strength values to decrease [4][5][6].The specimen size has also a significant effect on the UCS test results that an increase in the size makes a decrease in the UCS values [7][8][9]. Stress concentration at the crack

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Section: Discussionsupporting

confidence: 87%

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confidence: 99%

Loading rate conditions and specimen size effect on strength and deformability of rock materials under uniaxial compression

Komurlu

2018

Geo-Engineering

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“…It was assessed that the energy absorption capacities of grouted rock bolts increase due to the MS Polymer additive content, under both static and dynamic loading conditions. Energy absorption capacities of the grout materials are improved because of increasing in the crack propagation resistivity and ductility [27][28][29].…”

Section: Resultsmentioning

confidence: 99%

An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

Komurlu

2020

Int. J. of Geosynth. and Ground Eng.

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Effect of thermoset type polymeric additives on load-bearing capacities of grouted rock bolts was investigated with both laboratory and site studies. For the specimen preparation, two different silicone-based polymeric materials were added with different amounts in the cement and water mixes. Additionally, cement grouts without the polymeric additive were also used to compare results obtained from different grout usage cases. The additives are in the liquid phase while adding into the fresh cement mix and start to solidify due to the polymerization after being mixed in the grout material. Support performances of various grouted rock bolt specimens were tested under axial and shear loading conditions. According to the results of this study, use of the polymeric additives with an amount of 3.5% by weight in total mix significantly improves the ductility in support reactions of grouted bolts and increases the energy absorption capacity by high rates over 50%.

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“…The impact test measures the energy required to break the specimen by applying a dynamic load. 39 The total measured energy includes kinetic, frictional, and vibrational energies that are not correlated with the fracture resistance of the denture base material. The test methodology depends on specimen dimensions, notch depth, radius, impact velocity, etc.…”

Section: Discussionmentioning

confidence: 99%

Novel Cold Cure Acrylic Denture Base with Recycled Zirconia Nano-Fillers That Were Functionalized by HEMA Agent Incorporation: Using the Sprinkle Approach

Elzahar¹,

El-Okaily²,

Khedr³

et al. 2022

IJN

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Background Though acrylic resins possess many useful properties, denture fracture is nevertheless a familiar issue. Objective This study aimed to determine the effect of low-percent recycled Zirconia nanoparticles as filler on the transverse strength, impact strength, surface hardness, water sorption, and solubility of resin using the sprinkle cold-curing technique. Materials and Methods Various formulae were prepared and mixed with PMMA (polymer) powder containing varying percentages (0.01%, 0.1%, 0.3%, and 0.5%) of recycled ZrO2NPs to mono-methyl methacrylate (MMA monomer). A 2-hydroxyethyl-methacrylate (HEMA) agent was used to functionalize recycled zirconia (ZrO 2 ) nano-fillers. X-ray diffraction, field emission scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, and dynamic light scattering were used to characterize the samples. For mechanical tests, standard metallic moulds (according to American Dental Association specification no. 27) were machined for 60 specimens’ preparation, 12 for each percent (zero, 0.01%, 0.1%, 0.3%, and 0.5%). A one-way ANOVA test was used to compare the five groups for parametric data, while the Kruskal–Wallis test was employed for nonparametric data. The P 0.05 value was accepted as the significance level. All formulae were tested for cytotoxicity at 24 and 48 hours on WI38 normal lung cell lines. Results The XRD analysis demonstrated the tetragonal crystallographic structure of the recycled zirconia nanoparticles. Incorporating a low percentage of recycled ZrO 2 nanoparticles (0.01%, 0.1%, 0.3%, and 0.5%) improved the tested properties of PMMA to different degrees in a significant and non-significant pattern, while the optimal tested percent was 0.3%. Conclusion The 0.3% percentage of recycled zirconia nanoparticles maintained and improved the physical and mechanical properties of acrylic resin. Recycled ZrO 2 /PMMA nanocomposite is a synergistic candidate due to its economic return and clinical application safety.

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An Experimental Study on Determination of Crack Propagation Energy of Rock Materials under Dynamic (Impact) and Static Loading Conditions

Cited by 4 publications

References 41 publications

Loading rate conditions and specimen size effect on strength and deformability of rock materials under uniaxial compression

Loading rate conditions and specimen size effect on strength and deformability of rock materials under uniaxial compression

An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

Novel Cold Cure Acrylic Denture Base with Recycled Zirconia Nano-Fillers That Were Functionalized by HEMA Agent Incorporation: Using the Sprinkle Approach

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