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Journal articles on the topic 'Fracture toughness'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Kantor, Matvey Matveevich, Konstantin Grigorievich Vorkachev, Vyacheslav Aleksandrovich Bozhenov, and Konstantin Aleksandrovich Solntsev. "The Role of Splitting Phenomenon under Fracture of Low-Carbon Microalloyed X80 Pipeline Steels during Multiple Charpy Impact Tests." Applied Mechanics 3, no. 3 (2022): 740–56. http://dx.doi.org/10.3390/applmech3030044.

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The ambiguity of the splitting effect on X80 low-carbon microalloyed pipeline steels’ tendency towards brittle fracture prompted an experimental study of impact toughness scattering based on multiple Charpy impact tests in a temperature range from 20 °C to −100 °C. A fractographic analysis of a large number of fractured samples was carried out. The relationships between impact toughness, deformability and splitting characteristics were studied. A number of common features of three X80 low-carbon microalloyed pipeline steel fractures were revealed. It was experimentally established that the rea

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2

Kubošová, Andrea, Miroslav Karlík, Petr Haušild, and J. Prahl. "Fracture Behaviour of Fe₃Al and FeAl Type Iron Aluminides." Materials Science Forum 567-568 (December 2007): 349–52. http://dx.doi.org/10.4028/www.scientific.net/msf.567-568.349.

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Fracture behaviour of two intermetallic alloys based on FeAl and Fe3Al was studied. On the alloys Fe-40Al-1C (at%) and Fe-29.5Al-2.3Cr-0.63Zr-0.2C (at%) (FA06Z), a basic characterization, the fracture toughness tests and fractographic analysis were carried out. Tensile tests and fracture toughness tests were performed at 20, 200, 400 and 600°C. The fracture toughness values range from 26 MPa.m1/2 at 20°C to 42 MPa.m1/2 at 400°C. In addition, Jintegral dependence on a obtained by potential method was measured. The fractographic analysis showed that samples fractured at 20, 200 and 400°C in the

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3

An, Gyubaek, Jeongung Park, Hongkyu Park, and Ilwook Han. "Fracture Toughness Characteristics of High-Manganese Austenitic Steel Plate for Application in a Liquefied Natural Gas Carrier." Metals 11, no. 12 (2021): 2047. http://dx.doi.org/10.3390/met11122047.

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High-manganese austenitic steel was developed to improve the fracture toughness and safety of steel under cryogenic temperatures, and its austenite structure was formed by increasing the Mn content. The developed high-manganese austenitic steel was alloyed with austenite-stabilizing elements (e.g., C, Mn, and Ni) to increase cryogenic toughness. It was demonstrated that 30 mm thickness high-manganese austenitic steel, as well as joints welded with this steel, had a sufficiently higher fracture toughness than the required toughness values evaluated under the postulated stress conditions. High-m

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4

An, Gyubaek, Jeongung Park, Mituru Ohata, and Fumiyoshi Minami. "Fracture Assessment of Weld Joints of High-Strength Steel in Pre-Strained Condition." Applied Sciences 9, no. 7 (2019): 1306. http://dx.doi.org/10.3390/app9071306.

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Unstable fractures tend to occur after ductile crack initiation or propagation. In most collapsed steel structures, a maximum 15% pre-strain was recorded, at the steel structural connections, during the great earthquake of 1995, in Japan. Almost-unstable fractures were observed in the beam-to-column connections, where geometrical discontinuities existed. Structural collapse and unstable failure occurred after large-scale plastic deformations. Ship structures can also suffer from unstable fractures in the welded joints. The fracture resistance of butt-welded joints subjected to tension in the p

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5

Praunseis, Zdravko, Sonja Novak, and Jurij Avsec. "THE INFLUENCE OF STRENGTH MISMATCHING ON THE FRACTURE PROPERTIES OF HETEROGENEOUS JOINTS." Journal of Energy Technology 5, no. 4 (2024): 27–36. https://doi.org/10.18690/jet.5.4.27-36.2012.

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The differences in mechanical properties among different weld regions affect the strain distribution around the crack tip during fracture toughness tests and consequently influence the fracture toughness values. This paper demonstrates that both strength and toughness affect the fracture behaviour of such complex weldments. High toughness of weld metal is necessary to enable local plastic deformation and to prevent brittle fractures. It is of the utmost importance not to exclude the possibility of plane faults and the appearance local brittle zones in steel welded joints, which can cause failu

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6

Štefan, Jan, Jan Siegl, Jan Adámek, Radim Kopřiva, and Michal Falcník. "Microstructure and Failure Processes of Reactor Pressure Vessel Austenitic Cladding." Metals 11, no. 11 (2021): 1676. http://dx.doi.org/10.3390/met11111676.

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This paper is dedicated to an experimental program focused on the evaluation of microstructure and failure mechanisms of WWER 440 type nuclear reactor pressure vessel cladding made from Sv 08Kh19N10G2B stainless steel. Static fracture toughness tests performed on standard precracked single edge bend specimens revealed extreme variations in fracture toughness values, J0.2. Fractured halves of test specimens were subject to detailed fractographic and metallographic analyses in order to identify the causes of this behavior and to determine the relationship between local microstructure, failure mo

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7

Wang, Wenke, Yang Guo, Yuanbo Li, and Zhengning Li. "Fracture Toughness of Different Region Materials from a Dissimilar Metal Welded Joint in Steam Turbine Rotor." Coatings 12, no. 2 (2022): 174. http://dx.doi.org/10.3390/coatings12020174.

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This study systematically evaluated the fracture toughness of a CrMoV/NiCrMoV dissimilar metal welded joint (DMWJ) with buttering layer technology in a steam turbine rotor. The fracture resistance curves and parameters of base metals (BM-1 and BM-2), weld metal (WM), buttering layer (BL), and heat-affected zones (HAZ-1 and HAZ-2) in the welded joint were all obtained. The characteristic microstructures, carbides, and fracture surfaces were observed by optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results revealed a different fractu

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8

BAEK, SEUNG, and CHANG-SUNG SEOK. "FRACTURE CHARACTERISTICS OF DLC ON SILICON USING NANO-INDENTATION AND FEA." International Journal of Modern Physics B 20, no. 25n27 (2006): 4213–18. http://dx.doi.org/10.1142/s0217979206041112.

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In this study, using the nano and micro-indentation tests and finite element analysis (FEA), we investigated the fracture behaviors of diamond like carbon (DLC) on silicon in indentation state. Diamond like carbon coating of 3μm and 1.5μm thickness were deposited on polished (100) single crystal silicon substrates by radio frequency plasma assisted chemical vapor deposition (RF-PACVD), respectively. Fracture toughness of DLC films was calculated from the measured lengths of the cracks formed by nano and micro-indentation on each sample. We used various equations such as Lawn's and Liang's equa

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9

Nakano, Yoshifumi. "Fracture Toughness of Steels. (II). Fracture Toughness Test Methods." Journal of the Japan Welding Society 61, no. 7 (1992): 544–50. http://dx.doi.org/10.2207/qjjws1943.61.7_544.

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10

Sun, Yong Xing, Yuan Hua Lin, Long He, et al. "Dynamic Fracture Toughness Test and Evaluation for S135 Drill Pipe." Advanced Materials Research 194-196 (February 2011): 2035–38. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.2035.

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During oil-drilling, the fractures of drill tool thread and piercement of drill pipe upset transition are very common in drill pipe failure as an object of petroleum and metallurgical researchers home and abroad. The classical fracture mechanics can only resolve the static fracture problem of oil country tubular goods (OCTG), but not resolve drill pipe failure under dynamic load. It is well known that the API 5D just prescribes strength criterion of drill pipe material but fracture toughness of drill pipe material. So, it is important to study dynamic fracture toughness of drill pipe material

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11

Tyson, W. R., O. Vosikovsky, B. Faucher, and D. J. Burns. "Brittle Fracture in Heavy Section Welded T-Joints: Correlation Between Stress Intensity at Fracture and Small-Specimen Toughness Tests." Journal of Offshore Mechanics and Arctic Engineering 112, no. 1 (1990): 53–57. http://dx.doi.org/10.1115/1.2919835.

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A fracture mechanics analysis has been made of brittle fractures encountered during a program of fatigue tests of welded plate T-joints. Fracture toughnesses are in reasonable agreement with small-sample test results, if the following factors are taken into account: a specimen size effect (with larger samples having lower toughness); existence of a substantial contribution to the stress intensity factor from residual stresses; and shakedown of residual stresses, with shakedown increasing with increasing applied stress.

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12

Lee, Deok Bo, and Joo Hyung Kim. "Failure Analysis on Rubber-Modified Epoxy Resin under Various Loading Speed Conditions." Key Engineering Materials 297-300 (November 2005): 1907–12. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.1907.

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A rubber-modified epoxy resin is widely used as adhesive and matrix materials for fiber composite material. The structural reliability of composite material depends on the fracture toughness of the matrix resin. In this study, the fracture toughness and the damage zone around a crack tip in rubber-modified epoxy resin were investigated. The volume fractures of rubber (CTBN1300×8) in the rubber-modified epoxy resin were 0%, 5% and 15% under several loading speeds. The fracture toughness(KIC) and the fracture energy(GIC) were measured by using 3-point bending specimens. The 4-point bending speci

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13

Bartsch, Marion, Iulian Mircea, Jens Suffner, and Bernd Baufeld. "Interfacial Fracture Toughness Measurement of Thick Ceramic Coatings by Indentation." Key Engineering Materials 290 (July 2005): 183–90. http://dx.doi.org/10.4028/www.scientific.net/kem.290.183.

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The basic requirement for the use of a ceramic coating is sufficient adhesion to its substrate. A measure of the adhesive properties of a coating is the interfacial fracture toughness. The test method applicable for interfacial fracture toughness measurements depends on the mechanical properties of the material system and the geometry of the test piece. In this work, indentation methods have been evaluated for the estimation of the fracture toughness of ceramic thermal barrier coatings on metallic substrates. Coatings of 100 to 300 µm thickness were applied by electron beam – physical vapour d

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14

PARUCHURU, SATYA PRASAD, ANUJ JAIN, and XIAODU WANG. "SIZE REQUIREMENTS OF COMPACT SANDWICH SPECIMEN FOR TESTING OF BONE." Journal of Mechanics in Medicine and Biology 07, no. 04 (2007): 419–31. http://dx.doi.org/10.1142/s0219519407002406.

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It is well understood that bone quality deteriorates due to aging, disease, etc., and may be affected by factors at different length scales due to its hierarchical microstructure. Fracture toughness is one of the properties that assess bone quality. The compact sandwich (CS) specimen gives a better choice of bone sample size, and therefore suits a wide variety of fracture toughness testing needs and constraints. Reliable and statistically valid overall CS specimen size requirements are established in this paper; these serve as guidelines for choosing the CS specimen size. Finite element analys

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15

Hu, Hui, Yu Peng Cao, and Pei Ning Li. "Study on Fracture Toughness Prediction of Non Power Law Hardening Material by Using Local Approach." Advanced Materials Research 197-198 (February 2011): 1640–46. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.1640.

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A new method of fracture toughness K1C prediction of non power law hardening material by using cleavage fracture local approach is proposed in this paper. The fracture toughness of A508-Ⅲ 16MnR at different cleavage fracture probability are predicted by using the method. To most of pressure vessel carbon-manganese steels, cleavage fracture is likely to occur at the load corresponding to 62% cleavage fracture probability. Hence, the fracture toughness corresponding to the load is the most possible fracture toughness of the steels. The values of fracture toughness corresponding to 62% cleavage f

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16

Liu, Chao, Xinggui Yang, Wenqi Cao, Jin Lin, Yuxuan Liu, and Hang Zhang. "Discrimination Model of Interaction Between Hydraulic Fracture and Natural Fracture Based on Energy Balance." Processes 13, no. 6 (2025): 1652. https://doi.org/10.3390/pr13061652.

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Hydraulic fracturing technology has been extensively applied for the efficient development of unconventional reservoirs. Influenced by geological discontinuities such as naturally fractured weak planes, the complex interaction behaviors between hydraulic fractures and natural fractures significantly challenge the prediction of hydraulic fracture propagation paths. Establishing interaction discrimination models to predict these behaviors proves crucial for characterizing post-stimulation fracture complexity. This study develops a discrimination model for hydraulic-natural fracture interactions

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17

Zhao, Yawei, Xinjian Sun, Peng Cao, et al. "Mechanical Performance and Numerical Simulation of Basalt Fiber Reinforced Concrete (BFRC) Using Double-K Fracture Model and Virtual Crack Closure Technique (VCCT)." Advances in Civil Engineering 2019 (November 11, 2019): 1–15. http://dx.doi.org/10.1155/2019/5630805.

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This paper mainly investigates the fracture parameters of Basalt Fiber Reinforced Concrete (BFRC) with various fiber lengths and dosages using Double-K fracture model. The model was developed by fracture criterion using ABAQUS Virtual Crack Closure Technique (VCCT), and the results of the model and experiments were compared. The basalt fiber with length of 6 mm and 12 mm was added into concrete in the dosage of 0.0%, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% by volume of concrete, respectively. Concrete specimens were cast into three dimensions, i.e., 60 mm × 180 mm × 480 mm, 80 mm × 240 mm × 640 mm, a

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18

An, Gyubaek, Jeongung Park, Daehee Seong, and Ilook Han. "FRACTURE SAFETY OF LIQUEFIED NATURAL GAS TANK IN CRYOGENIC CONDITIONS." International Journal of Maritime Engineering 165, A1 (2023): 115–24. http://dx.doi.org/10.5750/ijme.v165ia1.1208.

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High-manganese austenitic steel has been developed as a new cryogenic steel for application in liquified natural gas (LNG) storage and fuel tanks, with improved fracture toughness and safety at cryogenic temperatures. Generally, the fracture toughness decreases at lower temperatures; therefore, cryogenic steel requires a high fracture toughness to prevent unstable fractures. This study conducted unstable ductile fracture tests with 30-mm-thick high-manganese austenitic steel and evaluated its applicability to LNG storage and fuel tanks. The ductile fracture resistance in the weld joints was ev

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19

M R, Sunil Kumar, Eva Schmidova, Pavel Konopík, Daniel Melzer, Fatih Bozkurt, and Neelakantha V Londe. "Fracture Toughness Analysis of Automotive-Grade Dual-Phase Steel Using Essential Work of Fracture (EWF) Method." Metals 10, no. 8 (2020): 1019. http://dx.doi.org/10.3390/met10081019.

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Fracture toughness determination of dual-phase DP450 steel using the essential work of fracture (EWF) methodology is the major focus of this research work. The EWF method is used for the determination of fracture toughness of thin sheets in a plane stress dominant condition. The EWF method is discussed in detail with the help of DP450 steel experimental results. Double edge notched tension (DENT) specimens with fatigue pre-crack and without fatigue crack (notched) have been used for testing. Specific essential work of fracture (we), crack tip opening displacement (δce) and crack tip opening an

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20

Qu, Wen Qing, Min Yuan Song, Jun Shan Yao, and Hai Yun Zhao. "Effect of Temperature and Heat Treatment Status on the Ductile Fracture Toughness of 2219 Aluminum Alloy." Materials Science Forum 689 (June 2011): 302–7. http://dx.doi.org/10.4028/www.scientific.net/msf.689.302.

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Through measurement of fracture toughness of 2219 aluminum alloy three-point bend specimen and observation of fracture surface and microstructure at different temperature, the influences of temperature and heat treatment status on the fracture toughness of 2219 aluminum alloy are discussed. The results show that temperature has an important influence on the fracture toughness of 2219 aluminum alloy. Compared with fracture toughness in room temperature, the fracture toughness is increased by 36% at low temperature. Heat treatment status also affects fracture toughness greatly, and fracture toug

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21

He, Zhi-Bo, Pan Liu, Da-Sheng Wang, and Yue-Bing Li. "Fracture toughness evaluation of 37CrNi3MoVE steel used for high-pressure air storage cylinder." Materials Express 12, no. 1 (2022): 123–32. http://dx.doi.org/10.1166/mex.2022.2133.

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The air storage cylinders, forming part of the impulse air system for submarine, are high-pressure steel cylinders dome-shaped at each end. To prevent the risk of cylinders rupture, the fracture toughness of cylinders is necessary to be tested. The three-point bending samples used in the fracture toughness experiment were taken from a cylinder made of 37CrNi3MoVE steel. With the consideration of the effect of the manufacturing process, both axial specimens and circumferential specimens were sampled, and the fracture toughness was compared. The effective data obtained from fracture toughness ex

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22

Rief, C., and K. Kromp. "Fracture toughness testing." International Journal of High Technology Ceramics 4, no. 2-4 (1988): 301–17. http://dx.doi.org/10.1016/0267-3762(88)90054-9.

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23

Kobayashi, A. S., M. Ramulu, M. S. Dadkhah, K. H. Yang, and B. S. J. Kang. "Dynamic fracture toughness." International Journal of Fracture 30, no. 4 (1986): 275–85. http://dx.doi.org/10.1007/bf00019707.

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24

Gierth, Anne Zora, Simon Syring, Tommy Mielke, and Doru C. Lupascu. "Fracture toughness on compact tension specimen as a quality parameter for cement stone." ce/papers 6, no. 6 (2023): 1055–60. http://dx.doi.org/10.1002/cepa.2902.

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AbstractA series of tests of compression strength and fracture toughness of hardened cement paste (cement stone) was carried out. The compression strength was tested on cubes with side lengths of 10, 20, 30 and 40 mm. Fracture toughness was measured on compact tension (CT) specimens with dimensions commonly used in metallurgy; two different thicknesses were used (h x l x b: 50 x 48 x 3 mm3 and 50 x 48 x 8 mm3). A particularly stiff piezo‐controlled test frame was used as testing device. The different thicknesses of the specimens allow the investigation of a possible size effect in toughness. I

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25

Shamim, Shahrukh, Gaurav Sharma, and Chandrabalan Sasikumar. "The Effect of Intermetallic Phases on Ductile to Brittle Transition of Aluminium-Iron Alloy." Applied Mechanics and Materials 592-594 (July 2014): 770–75. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.770.

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The effect of intermetallic phases and grain size on ductile to brittle transition temperature of Aluminium-Iron alloy (Al–11% Fe) was investigated in this research work. An Izod impact testing method was adopted to study the DBTT in the temperature interval of 77 K to 373 K. The ductile-brittle transition points: fracture transition plastic (FTP), fracture-appearance transition temperature (FATT), impact energy transition temperature (IETT), fractional surface area of cleavage (brittle) and fibrous (ductile) fractures and grain size of the samples were also determined. The fracture toughness

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26

Liu, Kaiyuan, Jian Xiong, Xi Zhang, Xiao Fan, and Le Li. "Prediction of Fracture Toughness in the Shale Formation Based on Well Logging and Seismic Data: A Case Study of the Lower Silurian Longmaxi Formation in the Sichuan Basin, China." Geofluids 2020 (November 30, 2020): 1–13. http://dx.doi.org/10.1155/2020/8896352.

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The rock physics experiments and fracture toughness tests of shales from the Lower Silurian Longmaxi Formation in the Sichuan Basin in China were carried out. Based on this, the calculation model of the fracture toughness was constructed, thus, the single well evaluation of the fracture toughness in shale formation would be obtained based on the well logging data, which can be used to summarize the spatial distribution characteristics of the fracture toughness in the shale formation. However, it is difficult to obtain transverse distribution characteristics of fracture toughness in shale forma

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Kieu, Le Hai, Jean Marc Delaye, and Claude Stolz. "Modeling Radiation Effects on the Fracture Process in Simplified Nuclear Glass." Key Engineering Materials 488-489 (September 2011): 154–57. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.154.

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Experimentally, the evolution of several mechanic properties (hardness, density, Young’s modulus, fracture toughness) is observed in nuclear glasses under irradiation. In this work, classical molecular dynamics calculations are performed to better understand fracture mechanisms in simplified nuclear glasses at atomistic scale and to explain the radiation effects. Fractures are simulated in more disordered glasses, representative of irradiated samples, to reveal radiation effects. We observe a lower elastic limit and a greater plasticity in the irradiated glass that can explain its larger fract

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28

Fuhrmann, D., D. Murchison, S. Whipple, and K. Vandewalle. "Properties of New Glass-Ionomer Restorative Systems Marketed for Stress-Bearing Areas." Operative Dentistry 45, no. 1 (2020): 104–10. http://dx.doi.org/10.2341/18-176-l.

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SUMMARY Objectives: The purpose of this study was to evaluate the properties (fracture toughness, surface hardness) of newer conventional glass-ionomer restorative materials that are marketed for posterior stress-bearing areas compared with more traditional glass-ionomer restorative materials marketed for non–load-bearing areas and composite-resin restorative materials. Methods and Materials: Notched-beam fracture toughness specimens were created in a mold with each tested material (Equia Forte, GC America, with and without a surface coating of Equia Forte Coat; Ketac Universal, 3M/ESPE; ChemF

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29

Kim, Min Chul, Bong Sang Lee, Won Jon Yang, and Jun Hwa Hong. "Determination of the Key Microstructural Parameter for the Cleavage Fracture Toughness of Reactor Pressure Vessel Steels in the Transition Region." Key Engineering Materials 297-300 (November 2005): 1672–77. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.1672.

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The effects of the microstructural parameters, such as the prior austenite grain size and carbide size, on the cleavage fracture toughness were investigated in the transition region of Mn-Mo-Ni bainitic low alloy steels. Cleavage fracture toughness was evaluated by the ASTM standard E 1921 Master curve method. In order to clarify the effects of each microstructure, the grain size and carbide size of the test materials were independently controlled by modifying the heat treatment process. Firstly, the grain sizes were changed from 25㎛ to 110㎛ without any significant changes in the carbide size

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30

Lee, Jung Suk, Jae Il Jang, Keun Bong Yoo, and Dong Il Kwon. "Evaluation of Fracture Toughness for Power Plant Materials Using Continuous Indentation Technique." Key Engineering Materials 321-323 (October 2006): 480–85. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.480.

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An indentation fracture toughness model is applied to estimate non-destructively the fracture toughness of power plant materials such as ASTM A53 and ASME SA335 P91. Fracture toughness evaluated using the model showed good agreement with current standard fracture toughness test results.

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Wang, Hai Long, Chun Ling Guo, and Xiao Yan Sun. "Effect of Calcium Dissolution on the Fracture Properties of Concrete Exposed to Nitric Acid Environment." Advanced Materials Research 374-377 (October 2011): 1974–78. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.1974.

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The effect of calcium leaching by nitric acid on fracture properties of concrete was experimentally studied. The double-K fracture parameters were investigated using three-point bending beams, and the deterioration regularity of fracture properties of concrete chronically attacked by nitric acid was gotten on basis of these results. The load-crack mouth opening displacement curves under different nitric attack periods were obtained by pasting some strain gauges onto the pre-crack tip. On basis of the double-K criterion, the unstable fracture toughness as well as the initial fracture toughness

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32

Ku, H., W. Xiang, and N. Pattarachaiyakoop. "Mathematical Modeling of the Fracture Toughness of Phenol Formaldehyde Composites Reinforced with E-Spheres." Advanced Materials Research 79-82 (August 2009): 1165–68. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1165.

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The fracture toughness of SLG filled phenolic composites have been determined by short bar tests. It is expensive to prepare the samples for the tests. Therefore, it is necessary to develop a mathematical model that will predict the fracture toughness of particulate filled phenolic composites. Mathematical models for tensile strength, Young’s modulus are available but not for impact strength and fracture toughness. There is no sign that it can be built up from simple mathematical model; polynomial interpolation using Lagrange’s method was therefore employed to generate the fracture toughness m

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Li, Kairui, Nickolay N. Smirnov, Chengzhi Qi, Mingyang Wang, Dmitry A. Pestov, and Anastasia A. Shamina. "A Planar-3D Mathematical Model for Studying the Effect of Heterogeneity of Rock Fracture Toughness on Hydraulic Fracture Propagation: Early-Time Solution including the Stage before Propagation." Mathematics 11, no. 9 (2023): 2083. http://dx.doi.org/10.3390/math11092083.

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Among the studies of the effect of rock’s heterogeneity on hydraulic fracture propagation, very little information on the effects of the heterogeneity of rock’s fracture toughness is available. The objective of the present paper is to develop a planar-3D model for studying the effect of the heterogeneity of rock’s fracture toughness on hydraulic fracture propagation. Not only the stage of fracture propagation, but also the stage before the fracture propagation is considered in this model. Based on the proposed model, the evolution of hydraulic fracture propagation under a typical heterogeneous

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Bisht, Neeraj, and Prakash Chandra Gope. "Effect of rice husk (treated/untreated) and rice husk ash on fracture toughness of epoxy bio-composite." Journal of the Mechanical Behavior of Materials 29, no. 1 (2020): 177–85. http://dx.doi.org/10.1515/jmbm-2020-0018.

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Abstract Present work studies the effect of particle reinforcement on fracture toughness of bio-composites. The filler used has been taken as rice husk. Epoxy resin has been taken as matrix material. Composites with varying filler loading of 10, 20, 30 and 40 wt.% were fabricated. The fracture toughness was seen to be increasing with increase in filler loading. However beyond 20% there was a decrease in fracture toughness with increase in filler loading. The effect of fibre treatment on toughness was also observed. Rice husk fibres pre-treated with NaOH were used. It was observed that fracture

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Stefan, Calin, Liviu Marsavina, and Catalin Miu. "<b>Fracture toughness of cancellous iliac bone</b>." Open Veterinary Journal 14, no. 11 (2024): 3108. https://doi.org/10.5455/ovj.2024.v14.i11.40.

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<b>Background:</b> Cancellous bone mechanical properties are directly linked to the structural integrity, which is a result of bone quantity, the quality of its bone matrix and its microarchitecture. Several studies highlighted the bone behavior under specific loads, contributing to understanding risk factors and developing more effective therapeutic strategies. The anatomy and stability of iliac bone fractures, providing insight into pelvic trauma management. <b>Aim:</b> To evaluate the anisotropic behavior of fracture toughness of porcine iliac bone. <b>Methods:

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Parasuraman, Prabhuraj, Tushar Sonar, and Selvaraj Rajakumar. "Microstructure, tensile properties and fracture toughness of friction stir welded AA7075-T651 aluminium alloy joints." Materials Testing 64, no. 12 (2022): 1843–50. http://dx.doi.org/10.1515/mt-2022-0212.

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Abstract The main objective of this investigation is to study the microstructure, tensile properties and fracture toughness of friction stir welded (FSW) butt joints of 10 mm thick AA7075-T651 plates. The microstructural features of stir zone (SZ), thermos-mechanically affected zone (TMAZ), heat affected zone (HAZ) were analyzed using optical microscopy technique. The tensile properties were evaluated using smooth and notch tensile specimens and compared to base metal properties. The microhardness survey was done across the weld cross section and correlated to the failure of tensile specimens.

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Nakano, Yoshifumi. "Fracture Toughness of Steels(III). Fracture Toughness and Its Control Factors." Journal of the Japan Welding Society 61, no. 8 (1992): 636–43. http://dx.doi.org/10.2207/qjjws1943.61.8_636.

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Lanning, David B., and M. H. Herman Shen. "Reliability of Welded Structures Containing Cracks in Heat-Affected Zones." Journal of Offshore Mechanics and Arctic Engineering 122, no. 4 (2000): 225–32. http://dx.doi.org/10.1115/1.1289288.

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This study investigates the reliability of a plate containing a semi-elliptical surface crack intersecting regions of dissimilar material properties. A weakest-link model is developed to express fracture toughness distributions in terms of effective crack lengths that account for the varying stress intensity factor along the crack front. The model is intended to aid in the development of fracture toughness distributions for cracks encountering local brittle zones (LBZ) in the heat-affected zones (HAZ) of welded joints, where lower-bound fracture toughness values have been measured in the labor

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Zhu, Lun. "Experimental Study by Using Drilling Core Materials Inversion Formation Rock Fracture Toughness Test Research." Applied Mechanics and Materials 538 (April 2014): 315–18. http://dx.doi.org/10.4028/www.scientific.net/amm.538.315.

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On the basis of Cliftons, hydraulic fracturing is established under the condition of cylindrical specimen fracture toughness expression. Using a self-built laboratory equipment, drilling core specimen for the fracture toughness test and obtain the relevant data. Based on the rock parameters inversion theory to construct the formation rock fracture toughness inversion objective function and optimization function. according to the drilling core material fracture toughness test data and the application of Matlab programming presented the formation rock fracture toughness.

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Mutoh, Y., N. Miyahara, K. Yamaishi, and T. Oikawa. "High Temperature Fracture Toughness in Silicon Nitride and Sialon." Journal of Engineering Materials and Technology 115, no. 3 (1993): 268–72. http://dx.doi.org/10.1115/1.2904217.

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Fracture Toughness of HIP-sintered silicon nitride decreased with increasing temperature up to 1200°C. The brittle-to-ductile transition was observed in the temperature range from 1200°C to 1275°C: the fracture toughness rapidly increased in the transition region. Above the transition temperature, the fracture toughness decreased with increasing temperature. Fracture toughness of sialon increased with increasing temperature. Transition of fracture mechanism was observed in sialon around 1300°C. The differences of temperature dependence of fracture toughness between two materials are interprete

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Karthikeyan, Vasudevan, Naveen Gopi Chander, Jetti Ramesh Reddy, and Balasubramanium Muthukumar. "Effects of incorporation of silver and titanium nanoparticles on feldspathic ceramic toughness." Journal of Dental Research, Dental Clinics, Dental Prospects 13, no. 2 (2019): 98–102. http://dx.doi.org/10.15171/joddd.2019.015.

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Background. Porcelain is brittle and in many situations it requires replacement in fractured or chipped restorations. The prospects exist in improving the strength of feldspathic porcelain to widen its applications. This study evaluated the fracture toughness of feldspathic porcelain after incorporation of silver and titanium nanoparticles at varying concentrations (0.5 wt%, 1 wt%, 1.5 wt% and 2 wt%). Methods. Test specimen dimensions were standardized to ASTM C1421–16 standards and a three-point flexure test was carried out to evaluate fracture toughness. A total of 330 samples were fabricate

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OHATA, Mitsuru. "Fracture Toughness ^|^amp; Fracture Performance Evaluation." JOURNAL OF THE JAPAN WELDING SOCIETY 78, no. 5 (2009): 453–55. http://dx.doi.org/10.2207/jjws.78.453.

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TAGAWA, Tetsuya. "Fracture Toughness ^|^amp; Fracture Performance Evaluation." JOURNAL OF THE JAPAN WELDING SOCIETY 80, no. 5 (2011): 470–71. http://dx.doi.org/10.2207/jjws.80.470.

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Zhou, Yu Mei, Feng Lin Zhang, Peng Cheng Li, Kun Bai, and Shang Hua Wu. "A Study on Ultra-Hard AlMgB₁₄ Modified by TiB₂ and Ni₃Al." Materials Science Forum 848 (March 2016): 607–12. http://dx.doi.org/10.4028/www.scientific.net/msf.848.607.

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AlMgB14 is a very hard and brittle material which need be modified for utilizing as cutting tool materials. In present study, TiB2 and Ni3Al were used to strengthen and toughen AlMgB14 material. The microstructure of the AlMgB14-TiB2-Ni3Al composites was analysized by scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDX) and an X-ray diffractometer (XRD). The hardness and fracture toughness of the AlMgB14-TiB2Ni3Al composites were also examined. The results showed that the major phases in AlMgB14-Ni3Al composites were TiB2, AlMgB14, MgAl2O4 , Ni3Al and NiAl. With t

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Lee, Soo Hyun, Jink Wang Kim, Su Nam Kim, Sang Bong Cho, and Jon Do Yun. "Interfacial Fracture Toughness for Film on Substrate Determined by Indentation Method." Key Engineering Materials 345-346 (August 2007): 801–4. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.801.

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Indentation method was used to determine the interfacial fracture toughness of epoxy coating on aluminum substrate. Tensile testing followed by finite element analysis was also performed to determine the interface fracture toughness. Fracture toughness values determined by two methods were consistent, giving reliability to indentation method for interfacial fracture toughness measurement.

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Li, Jun, Fengchi Wang, Fu Yi, Jie Ma, and Zhenhuan Lin. "Fractal Analysis of the Fracture Evolution of Freeze-Thaw Damage to Asphalt Concrete." Materials 12, no. 14 (2019): 2288. http://dx.doi.org/10.3390/ma12142288.

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AC (asphalt concrete)-13, as the main material used in pavement construction, has been applied widely in seasonal frozen areas. In order to understand the fracture mechanism in the freeze-thaw (F-T) damage process, the mesoscale structure of AC-13 is obtained by computed tomography (CT). The fractal dimension of cracks is used as a damage evaluation index. Most previous studies have only focused on the fractal dimensions of whole cracks, while ignoring the fractal tectonic process and the self-similarity degree of a single fracture. Therefore, in this study, the intrinsic mechanism of fracture

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Pokluda, Jaroslav, Ivo Dlouhý, Marta Kianicová, Jan Čupera, Jana Horníková, and Pavel Šandera. "Temperature Dependence of Fracture Characteristics of Variously Heat-Treated Grades of Ultra-High-Strength Steel: Experimental and Modelling." Materials 14, no. 19 (2021): 5875. http://dx.doi.org/10.3390/ma14195875.

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The temperature dependence of tensile characteristics and fracture toughness of the standardly heat-treated low-alloyed steel OCHN3MFA along with three additionally heat-treated grades was experimentally studied. In the temperature range of ⟨−196; 22⟩ °C, all the additional heat treatments transferred the standard steel from a high- to ultra-high strength levels even with improved tensile ductility characteristics. This could be explained by a reduction of the inclusion content, refinement of the martensitic blocks, ductile retained austenite content, and homogenization of the shape ratio of m

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Song, Kejin, Peichen Liang, Xuesong Fu, Zhenggen Hu, Guoqing Chen, and Wenlong Zhou. "Thickness Effect of 2195 Al–Li Alloy Friction Stir Weld Fracture Toughness." Materials 17, no. 15 (2024): 3639. http://dx.doi.org/10.3390/ma17153639.

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For damage tolerance design in engineering components, the fracture toughness value, KIC, of the material is essential. However, obtaining specimens of sufficient thickness from stir friction welded plates is challenging, and often, the experimental test values do not meet the necessary criteria, preventing the experimental fracture toughness, Kq, from being recognized as plane strain fracture toughness KIC. The fracture toughness Kq of 2195 Al–Li alloy welding seams with different thicknesses was measured on the forward and backward sides. Microstructure characterization was conducted by scan

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Ripling, E. J., and P. B. Crosley. "Full-Thickness Crack Arrest Fracture Toughness of 9-Percent Ni (ASTM 553, Type 1) Steels." Journal of Pressure Vessel Technology 113, no. 3 (1991): 375–79. http://dx.doi.org/10.1115/1.2928769.

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Measurements were made of the full-thickness crack arrest fracture toughness (FTCAT) of three 9-percent Ni steels having the range of thicknesses and Charpy V-notch toughnesses of plates now in LNG storage tank service. Unlike the plates used in large pressure vessels, these thinner plates do not crack under a condition of plane strain, so that test method ASTM E1221 “Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, Kla, of Ferritic Steels,” was modified for these tests. The toughness of all three steels was measured at liquid nitrogen temperature (−196C), but

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Seong, Daehee, Wonjun Jo, Jisun Roh, et al. "Liquid Hydrogen Properties Affecting Fracture Toughness." Journal of Welding and Joining 42, no. 4 (2024): 414–27. http://dx.doi.org/10.5781/jwj.2024.42.4.9.

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In this study, fracture toughness with the base metal of 9% Ni steel, a cryogenic steel, was evaluated under conditions without hydrogen charging (WO-H) and with hydrogen charging (W-H). Hydrogen charging was performed using an electrochemical cathodic charging method in a electrolyte of 3% NaCl + 0.3% NH4SCN at 19℃ with a current density of 50 A/m². Fracture toughness was assessed at -80℃, -100℃, -130℃, and -160℃ using CTOD (Crack Tip Opening Displacement) tests. The results for WO-H indicated a decrease in fracture toughness values with decreasing temperature, while the results for W-H showe

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