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Journal articles on the topic 'Fracture toughness; Mechanical properties'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

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1

Murphy, B. R., and T. H. Courtney. "Mechanochemically synthesized NbC cermets: Part II. Mechanical properties." Journal of Materials Research 14, no. 11 (1999): 4285–90. http://dx.doi.org/10.1557/jmr.1999.0580.

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The mechanical behavior of mechanochemically synthesized NbC cermets was investigated. Material hardnesses range from a high of 19.6 GPa for as-synthesized cermets containing about 4 vol% of Fe to a low of about 4 GPa for heat-treated cermets containing about 34 vol% Cu. Higher hardness generally correlates with lower fracture toughness (about 2 MPa m1/2 for cermets containing the highest percentage of NbC) and vice versa. Highest fracture toughness (about 7.5 MPa m1/2) is found in NbC–18 vol% Fe cermets heat treated extensively following consolidation. Abnormally low fracture toughnesses are
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2

Biswas, Nilormi, Arjun Dey, Saugata Kundu, Himel Chakraborty, and Anoop K. Mukhopadhyay. "Mechanical Properties of Enamel Nanocomposite." ISRN Biomaterials 2013 (April 9, 2013): 1–15. http://dx.doi.org/10.5402/2013/253761.

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For adult Indian premolar teeth, we report for the first time ever the simultaneous evaluations of nanohardness, Young's modulus, and fracture toughness of the enamel nanocomposite. The nanohardness and Young's moduli were evaluated from near the beginning of the middle enamel region to within ~10 μm of the dentino-enamel junction (DEJ) and in the dentin region using the nanoindentation technique. The fracture toughness from near the middle of the enamel region to near the DEJ zone was measured using the microindentation technique. The deformation was studied using scanning electron microscopy
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3

Low, It Meng, Z. Y. Che, Bruno A. Latella, and K. S. Sim. "Mechanical and Fracture Properties of Bamboo." Key Engineering Materials 312 (June 2006): 15–20. http://dx.doi.org/10.4028/www.scientific.net/kem.312.15.

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The microstructure, mechanical, impact and fracture properties of Australian bamboo have been investigated. The graded composition and property has been confirmed by depth-profiles obtained by synchrotron radiation diffraction and Vickers indentation. The mechanical performance of bamboo is stronly dependent on age. Results showed that young bamboo has higher strength, elastic stiffness and fracture toughness than its old counterpart. Both crack-deflection and crackbridging are the major energy dissipative processes for imparting a high toughness in bamboo.
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4

Min, Guang Hui, Li Xia Yang, Hua Shun Yu, and Jiande Han. "Mechanical Properties of CaB6 Sintered Body." Key Engineering Materials 297-300 (November 2005): 2707–12. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2707.

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In this paper, CaB6 sintered body was fabricated by hot-pressed sintering with/without nickel as a sintering aid. The microstructure and fracture morphology were observed by means of SEM. CaB6 polycrystalline hot-pressed at 2123K showed insufficient densification. Fracture surface revealed that the existence of pores and the poor grain boundaries made the occurrence of intergranular fracture. When 28wt% nickel was added, nearly full density was obtained, although the sintering temperature is 200K lower. Hardness, Bending strength and fracture toughness of polycrystalline CaB6 were measured. By
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5

Zhao, Jing Song, Yi Feng, Nan Nan Chen, et al. "Fabrication and Mechanical Properties of Alumina—CNTs Composites." Applied Mechanics and Materials 66-68 (July 2011): 1390–96. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.1390.

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The transmutation target of nuclear waste material has been fabrication by a powder metallurgy method by using Alumina as the matrix and CNTs as reinforcement. The effect of different nanotube contents on the fracture toughness and the bending strength was investigation. The results showed the fracture toughness and the bending strength of composites increased with increasing CNTs mass fraction when the content of CNTs was less than 1.5%. However, when the contents of CNTs greater than 1.5%, the fracture toughness and the bending strength of composites decreased as the content of CNTs increase
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6

Zhang, Tao, Hai Yun Jin, Yong Ian Wang, and Zhi Hao Jin. "The Mechanical Properties of AlN/BN Laminated Ceramic Composites." Materials Science Forum 569 (January 2008): 97–100. http://dx.doi.org/10.4028/www.scientific.net/msf.569.97.

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AlN/BN laminated ceramic composites were fabricated using tape-casting and hot-pressing by optimizing the designs of the structure and geometry of AlN/BN laminated ceramic composites. The results showed that the fracture toughness and bending strength for AlN/BN laminated ceramics reached 9.1MPa.m1/2 and 378MPa respectively. The fracture toughness is two times higher than that of AlN monolithic ceramics. The excellent fracture toughness of AlN/BN laminated ceramics could be mainly attributed to crack deflection, delaminating, branching, parallel propagation and crack laminate pilling out at th
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7

Yuan, Zhi Shan, Zheng Lu, You Hua Xie, Xiu Liang Wu, Sheng Long Dai, and Chang Sheng Liu. "Mechanical Properties of a Novel High-Strength Aluminum-Lithium Alloy." Materials Science Forum 689 (June 2011): 385–89. http://dx.doi.org/10.4028/www.scientific.net/msf.689.385.

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As a heat treatable aluminum alloy to be used in T6 and T8 temper, belongs to Al-Cu-Li system, a novel high-strength aluminum-lithium alloy 2A97 was developed. In order to improve the relationships of strength and ductility and fracture toughness, and to urge the applications in the aeronautical and aerospace industries, the effects of normal heat treatments and thermomechanical heat treatments on the mechanical properties and fracture toughness were investigated by Transmission Electron Microscope(TEM), Scanning Electronic Microscope (SEM), tensile test, and fracture toughness test. The resul
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8

Wang, Zhi, Jiajia Zhou, and Long Li. "Fracture Mechanical Properties of Rocklike Materials Under Half Symmetric Loading." Archives of Civil Engineering 63, no. 4 (2017): 71–82. http://dx.doi.org/10.1515/ace-2017-0041.

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AbstractThe authors studied the fracture mechanical properties under half-symmetric loading in this paper. The stress distribution around the crack tip and the stress intensity factor of three kinds of notched specimens under half symmetric loading were compared. The maximum tensile stress σmax of double notch specimens was much greater than that of single notch specimens and the maximum shear stress τmax was almost equal, which means that the single notch specimens were more prone to Mode II fractures. The intensity factors KII of central notch specimens were very small compared with other sp
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9

Liu, Xue Quan, Cun Guang Ding, Chang Hai Li, Yi Li, Li Xin Li, and Jin Pu Li. "Microstructure and Mechanical Properties of Sintered Fibrous Monolith Cemented Carbide." Advanced Materials Research 815 (October 2013): 233–39. http://dx.doi.org/10.4028/www.scientific.net/amr.815.233.

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A fibrous monolith cemented carbide with WC-6Co as cell and WC-20Co as cell boundaries was produced through hot co-extrusion process in this paper. The density, hardness, bending strength and fracture toughness of the fibrous monolith cemented carbide were tested, and the fracture and crack propagation were observed by metalloscope and SEM. The results showed that the bending strength and fracture toughness of the fibrous monolith cemented carbides was remarkably improved 71.91% and 45.7% respectively, while the hardness was slightly decreased 1% compared with WC-6Co composites. It is the reas
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10

Sung, Rak Joo, Takafumi Kusunose, Tadachika Nakayama, et al. "Mechanical Properties of Transparent Polycrystalline Silicon Nitride." Key Engineering Materials 317-318 (August 2006): 305–8. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.305.

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A novel transparent polycrystalline silicon nitride was fabricated by hot-press sintering with MgO and AlN as additives. The mixed powder with 3 wt.% MgO and 9 wt.% AlN was sintered at 1900oC for 1 hour under 30 MPa pressure in a nitrogen gas atmosphere. Transparent polycrystalline silicon nitride was successfully fabricated. The mechanical properties such as density, hardness, young’s modulus, fracture strength and fracture toughness were evaluated. The effect of α/β phase on the mechanical properties of transparent polycrystalline silicon nitride was investigated. The properties were changed
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11

Peng, Ke Wu, Nian Wen Pu, He Li Ma, Ren Chen, and Yan Wang. "Mechanical Properties and Microstructure of Boron Carbide-Cerium Boride Composite." Advanced Materials Research 482-484 (February 2012): 1551–55. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1551.

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The mechanical properties of B4C-CeB6 composite prepared by hot pressed sintering method were tested. The study shows: the hardness of B4C-CeB6 composite increases with the content of cerium boride. When the content of the cerium boride is 4wt%, the hardness reaches its supreme value of 31.98Gpa，its hardness is improved nearly 21.09% compared to monolithic boron carbide. The content of the cerium boride does not affect greatly on flexibility strength. However，it gives much effect on fracture toughness. When the content of the cerium boride is 4wt%, the fracture toughness reaches its supreme va
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12

Wang, Xiao Xiang, Wei Qi Wang, Wei Qing Li, Feng Li Li, and Yu Lan Yang. "The Effect of Heat Treatment System on Mechanical Properties of Titanium Alloy BTi-6554." Materials Science Forum 618-619 (April 2009): 177–80. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.177.

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The effects of solution and aging treatment on the mechanical properties of BTi-6554 alloy titanium were investigated. The results showed: As to βsolution and aging treatment, the increase of fracture toughness is quite conspicuous as the solution temperature was raised, but the change of strength and plasticity is not obvious; As to (α+β) solution and aging treatment, the decline of fracture toughness and plasticity is quite conspicuous as the solution temperature increased, but the strength increased. The strength of (α+β) solution and aging treatment is higher than that of βsolution and agi
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13

Zhang, Peng, Jia Wang, Qingfu Li, Jinyi Wan, and Yifeng Ling. "Mechanical and fracture properties of steel fiber-reinforced geopolymer concrete." Science and Engineering of Composite Materials 28, no. 1 (2021): 299–313. http://dx.doi.org/10.1515/secm-2021-0030.

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Abstract In this study, the effects of steel fibers on the mechanical properties of the geopolymer concrete – compressive, splitting tensile, and flexural strength; compressive elastic modulus; and fracture properties – were evaluated. Milling steel fibers were incorporated into the geopolymer concrete, and the volume fraction of the steel fibers was varied from 0 to 2.5%. Fly ash and metakaolin were chosen as the geopolymer precursors. Fracture parameters – critical effective crack length, initial fracture toughness, and unstable fracture toughness – were measured by a three-point bending tes
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14

Hsieh, Tsung-Han, Ming-Yuan Shen, Yau-Shian Huang, Qi-Qian He, and Hsuan-Chih Chen. "Mechanical Properties of Glass Bead-Modified Polymer Composite." Polymers and Polymer Composites 26, no. 1 (2018): 35–44. http://dx.doi.org/10.1177/096739111802600105.

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This present work investigated the adhesive effect of the material properties and fracture toughness of a thermosetting epoxy polymer modified with micron-sized glass beads. Various surface treatments were used to modify the surfaces of the glass beads in order to consider the effect of the glass bead particle/epoxy adhesion on the material properties and toughness of the polymer-based composites. Adding glass beads into polymer resulted in an increase in the modulus. The maximum value of the modulus was obtained for the polymer composite modified with well-bonded glass beads. The addition of
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15

Fereidoon, Abdolhossein, Lia Mottahedin, and Sara Tahan Latibari. "Investigation of fracture toughness parameters of epoxy nanocomposites for different crack angles." Journal of Polymer Engineering 32, no. 4-5 (2012): 311–17. http://dx.doi.org/10.1515/polyeng-2011-0120.

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Abstract The effects of single-walled carbon nanotubes (SWCNTs) on the mechanical properties of nanocomposites with epoxy matrix were studied, with the emphasis on fracture toughness under tensile loading conditions. It has been demonstrated that adding CNTs into polymer-based materials can improve the mechanical properties of this material. CNTs possess a certain potential to improve the fracture toughness of epoxy systems due to their mechanical properties and increase the fracture toughness of nanocomposites. Since the fracture toughness parameters were best manifested in the scaling proper
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16

Jun, Liu, Liu Su, Chen Zhigang, Zhou Fei, and Chang Min Suh. "Effect of Y-TZP on Mechanical Properties of Al2O3-TiB2 Ceramics." International Journal of Modern Physics B 17, no. 08n09 (2003): 1279–84. http://dx.doi.org/10.1142/s0217979203018879.

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The effect of Y-TZP additive on the mechanical properties of Al2O3-TiB2 ceramics was investigated. The results indicate that Y-TZP additive can enhance the flexure strength and fracture toughness of Al2O3-TiB2 ceramics, but has little effect on their hardness. The maximum bending strength of Al2O3-TiB2 and Al2O3-TiB2-Y-TZP ceramics are at 20vol% TiB2 content. The maximum fracture toughness for two kinds of ceramics all are at 30vol% TiB2 content. The bending strength and fracture toughness as well as impact resistance of Al2O3-TiB2-Y-TZP ceramics are higher than those of Al2O3-TiB2 ceramics. T
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17

Liu, Yongwei, Fuwen Chen, Guanglong Xu, Yuwen Cui, and Hui Chang. "Correlation between Microstructure and Mechanical Properties of Heat-Treated Ti–6Al–4V with Fe Alloying." Metals 10, no. 7 (2020): 854. http://dx.doi.org/10.3390/met10070854.

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The microstructure and mechanical properties of a newly developed Fe-microalloyed Ti–6Al–4V titanium alloy were investigated after different heat treatments. The volume fraction and the morphological features of the lamellar α phase had significant effects on the alloy’s mechanical performance. A dataset showing the relationship between microstructural features and tensile strength, elongation, and fracture toughness was developed. A high aging temperature resulted in high plasticity and fracture toughness, but relatively low strength. The high strength favored the fine α and the slender β. Th
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18

Sun, Zhu Feng, and Ling Yun Xie. "Impact of Metallic Foam’s Microstructure to its Mechanical Property." Advanced Materials Research 634-638 (January 2013): 2808–12. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2808.

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Explored the influence of pore structure of foam metal material on mechanical behavior of fracture. Discuss fracture toughness of several different micro geometric structure of foam metal material with finite element method. The author's calculations showed, microstructure and loading mode has an important effect on the fracture toughness of the foam metal material. due to ignoring the effects of cell structure on the mechanical properties of materials, the classic fracture toughness criterion -crack tip opening displacement (COD) is incomplete, it would be more efficient to take opening displ
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19

Kim, Seong-Eun, and In-Jin Shon. "Mechanical Properties and Rapid Sintering of Nanostructured WC-Al2O3-Al Hard Materials." Journal of Nanoscience and Nanotechnology 21, no. 7 (2021): 3929–33. http://dx.doi.org/10.1166/jnn.2021.19244.

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Nanostructured WC-Al2O3-Al composites was sintered using rapid high-frequency induction heated sintering (HFIHS) and the mechanical properties such as hardness and fracture toughness with consolidation were investigated. The HFIHS method induced a very fast densification nearly at the level of theoretical density and successfully prohibited grain growth, resulting in nano-sized grains. The fracture toughness was improved due to the consolidation facilitated by adding Al to WC-Al2O3 matrix. The WC-Al2O3 composites added with 5 and 10 vol.% Al showed higher hardness and fracture toughness compar
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20

Tohgo, Keiichiro, and Takayuki Kawaguchi. "Influence of Material Composition on Mechanical Properties and Fracture Behavior of Ceramic-Metal Composites." Key Engineering Materials 297-300 (November 2005): 1516–21. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.1516.

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In order to estimate distribution of mechanical properties and fracture toughness in ceramic-metal functionally graded materials (FGMs), mechanical properties and fracture behavior have been investigated on non-graded ceramics-metal composites which correspond to each region of FGMs. The materials are fabricated by powder metallurgy using partially stabilized zirconia (PSZ) and stainless steel (SUS 304). Vickers hardness, Young’s modulus and bending fracture strength were examined on smooth specimens. The Vickers hardness of the composites continuously decreases with an increase in a volume fr
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21

Reynolds, T. D., M. Acosta, and David R. Johnson. "Processing and Mechanical Properties of RuAl-Based Alloys." Materials Science Forum 539-543 (March 2007): 1469–74. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1469.

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Alloys of Ru-Al-Cr with compositions between Ru-10Al-35Cr and Ru-3Al-39Cr (at.%) were directionally solidified and heat treated to produce single phase hcp-Ru(Cr,Al) and two phase B2-hcp microstructures. The room temperature fracture toughness, tensile behavior, and cyclic oxidation behavior at 1100°C were investigated and compared to previous results measured from RuAl and Ru-Al-Mo alloys. For microstructures consisting of a Ru(Cr,Al) matrix with fine RuAl precipitate, a good room temperature fracture toughness, tensile ductility, and oxidation resistance at 1100°C were measured.
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22

Wu, Xi Wang, Jian Zhong Xiao, Feng Xia, Yong Gang Hu, and Zhou Peng. "Preparation and Mechanical Properties of Carbon Nanotubes Reinforced Alumina Ceramic Composite." Advanced Materials Research 239-242 (May 2011): 2721–27. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2721.

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How to uniformly disperse carbon nanotubes (CNTs) and densely sinter green body are the key issues to prepare carbon nanotubes reinforced alumina (Al2O3) composite. We prepare CNTs-Al2O3 powder by shearing extruding dispersion method, and then obtain CNTs-Al2O3 composite by hydrogen atmosphere pressureless sintering. 93% of the relative increased fracture toughness can be achieved, when the CNTs content of composite is 1%. Because of Absorbing energy by pulling CNTs out from alumina matrix and refining grain by CNTs bundles sitting along alumina grain, the fracture toughness is improved obviou
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23

Li, Hong Bo, Jing Wang, Han Chi Cheng, Chun Jie Li, and Xing Jun Su. "Effect of Tempering Temperature on Mechanical Properties of High Strength Wear Resistant Cast Steel." Advanced Materials Research 791-793 (September 2013): 440–43. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.440.

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This paper mainly studied the high temperature quenching oil quenching, tempering temperature on the influence of high strength steel mechanical properties of wear resistant. The results show that high strength and toughness wear-resistant cast steel with 880°C× 30min after oil quenching, the hardness of 38.6HRC steel, the impact toughness value reaches 40.18J/cm2. After 200°C, 400°C and 600°C tempering, with the increase of the tempering temperature, the hardness decreased linearly, as by 600°C tempering, the hardness has been reduced to 22.3HRC. Impact toughness with the tempering temperatur
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24

Kwon, Seok Jin, Dong Hyung Lee, Jung Won Seo, and Hyun Mu Hur. "Mechanical Properties of Railway Wheel for Standard Reinforcement." Advanced Materials Research 26-28 (October 2007): 1247–50. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.1247.

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For the high quality of wheel, the railway wheel has standardized such as UIC, KS, and JIS code but the chemical composition, the mechanical property and the hardness is merely requested. Although the standard of railway wheel has sustained, the damages of railway wheel have been occurred in service running. Because of wheel damage with spalling, shelling and thermal crack, the maintenance cost for the railway wheel has increased. In order to reduce wheel damage, it is necessary to reinforce the standard of railway wheel. In present study, the fracture mechanics characteristics of railway whee
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25

Jordan, William M., Walter L. Bradley, and Richard J. Moulton. "Relating Resin Mechanical Properties to Composite Delamination Fracture Toughness." Journal of Composite Materials 23, no. 9 (1989): 923–43. http://dx.doi.org/10.1177/002199838902300904.

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26

Kim, Jang Kyo, Naveed A. Siddiqui, Ricky S. C. Woo, Christopher K. Y. Leung, and Arshad Munir. "Carbon Fibre-Organoclay Hybrid Epoxy Composites: Fracture Behaviours and Mechanical Properties." Key Engineering Materials 312 (June 2006): 179–86. http://dx.doi.org/10.4028/www.scientific.net/kem.312.179.

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The fracture resistance and mechanical properties of carbon fiber reinforced composites (CFRPs) containing organoclay-filled epoxy resin are studied. The XRD analysis and TEM examination revealed well-dispersed organoclay in the epoxy matrix displaying a mixture of exfoliation and intercalation. There was a significant improvement in flexural modulus and a marginal reduction in flexural strength of epoxy matrix due to the incorporation of organoclay. The quasi-static fracture toughness of epoxy increased nearly 60% with the addition of 3wt% clay, but there was a 45% drop in impact fracture tou
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27

Baer, Wolfram. "Performance of Modern DCI Materials – Investigation of Microstructural, Temperature and Loading Rate Effects on Mechanical and Fracture Mechanical Properties." Materials Science Forum 783-786 (May 2014): 2244–49. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.2244.

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Design and safety assessment of advanced ductile cast iron (DCI) components like windturbines or transport and storage casks for radioactive materials require appropriate material data interms of strength and fracture toughness. Therefore, it is of vital importance to characterize andunderstand the deformation, damage and fracture behaviour of DCI which may substantially changefrom ductile to brittle by increasing loading rate, decreasing temperature and/or increasing stresstriaxiality. This paper reports on recent BAM investigations on different qualities of the widely usedDCI grade EN-GJS-40
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28

Markandan, Kalaimani, Jit Kai Chin, and Michelle T. T. Tan. "Study on Mechanical Properties of Zirconia-Alumina Based Ceramics." Applied Mechanics and Materials 625 (September 2014): 81–84. http://dx.doi.org/10.4028/www.scientific.net/amm.625.81.

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This paper describes the characterisations of ceramic composites consisting of different compositions of alumina and zirconia. The material characterisations were performed from the aspects of densification, hardness and fracture toughness. The surface morphology and elemental composition of the composite were studied using SEM and EDX respectively. As for physical properties, the highest attainable hardness and fracture toughness were 11.35 GPa and 3.41 MPa m0.5respectively for ceramic composite consisted of 80 wt % Zr and 20 wt% Al. Sintering at 1150oC assisted in the densification of cerami
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Carrasquero Rodriguez, Edwuin Jesus, Jaime Moises Minchala Marquino, Byron Ramiro Romero Romero, Luis Marcelo Lopez Lopez, and Jorge Isaac Fajardo Seminario. "Determination of fracture toughness and elastic module in materials based silicon nitride." Ingeniería Investigación y Tecnología 20, no. 4 (2019): 1–13. http://dx.doi.org/10.22201/fi.25940732e.2019.20n4.048.

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The knowledge of the mechanical properties of any material subjected to loads is necessary for its use in structural applications. Silicon nitride (Si3N4) ceramics are well-known materials used in engineering applications due to their outstanding combination of high strength and fracture toughness. The most studied mechanical properties of Si3N4 are hardness, fracture toughness and mechanical resistance. Recent advances in the production processes that incorporate high purity rare earth elements as sintering additives have improved these mechanical properties. Using Vickers indentation method,
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30

Maier, Marcus, Alireza Javadian, Nazanin Saeidi, Cise Unluer, Hayden K. Taylor, and Claudia P. Ostertag. "Mechanical Properties and Flexural Behavior of Sustainable Bamboo Fiber-Reinforced Mortar." Applied Sciences 10, no. 18 (2020): 6587. http://dx.doi.org/10.3390/app10186587.

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In this study, a sustainable mortar mixture is developed using renewable by-products for the enhancement of mechanical properties and fracture behavior. A high-volume of fly ash—a by-product of coal combustion—is used to replace Portland cement while waste by-products from the production of engineered bamboo composite materials are used to obtain bamboo fibers and to improve the fracture toughness of the mixture. The bamboo process waste was ground and size-fractioned by sieving. Several mixes containing different amounts of fibers were prepared for mechanical and fracture toughness assessment
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31

Fei, Yu Huan, Chuan Zhen Huang, Han Lian Liu, and Bin Zou. "Mechanical Properties of Al2O3-TiN Nanocomposite Ceramic Tool Materials." Key Engineering Materials 499 (January 2012): 108–13. http://dx.doi.org/10.4028/www.scientific.net/kem.499.108.

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Al2O3-TiN nanocomposite ceramic tool materials were fabricated by hot-pressing technique and the mechanical properties were measured. Mechanical properties such as room temperature flexural strength, Vickers hardness and fracture toughness were measured through three-point bending test and Vickers indentation. The effects of the content of nano-scale TiN, sintering temperature and holding time on the mechanical properties were investigated. The results shows that the addition of nano-scale TiN can improve the mechanical properties of alumina ceramics. Both the flexural strength and the fractur
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32

Shimada, Yusuke, Yoichi Kayamori, Shohei Nishida, Mitsuhiro Matsuda, and Kazuki Takashima. "Micromechanical Characterisation of Microstructure in Weld Heat Affected Zone of Structural Steel." Key Engineering Materials 525-526 (November 2012): 585–88. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.585.

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Microstructures in the weld heat affected zone (HAZ) can cause a decrease in fracture toughness, and evaluating the effect of microstructures on fracture toughness is helpful in understanding the cause of the fracture toughness decrease. In this study, micro-sized tensile specimens were sampled from base metal and HAZ, and the mechanical properties and fracture behaviours of different steel microstructures were directly investigated by micro-sized mechanical testing.
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33

Eun, Jong H., Bo K. Choi, Sun M. Sung, Min S. Kim, and Joon S. Lee. "Effect of toughened polyamide-coated carbon fiber fabric on the mechanical performance and fracture toughness of CFRP." Journal of Composite Materials 55, no. 20 (2021): 2721–38. http://dx.doi.org/10.1177/0021998321999458.

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In this study, carbon/epoxy composites were manufactured by coating with a polyamide at different weight percentages (5 wt.%, 10 wt.%, 15 wt.%, and 20 wt.%) to improve their impact resistance and fracture toughness. The chemical reaction between the polyamide and epoxy resin were examined by fourier transform infrared spectroscopy, differential scanning calorimetry and X-ray photoelectron spectroscopy. The mechanical properties and fracture toughness of the carbon/epoxy composites were analyzed. The mechanical properties of the carbon/epoxy composites, such as transverse flexural tests, longit
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Fan, Chun Ping, Zi Qiao Zheng, Min Jia, Ji Fa Zhong, and Bin Cheng. "Microstructure and Mechanical Properties of Al-Li Alloy 2397-T87 Rolled Plate." Materials Science Forum 788 (April 2014): 249–57. http://dx.doi.org/10.4028/www.scientific.net/msf.788.249.

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The microstructure, tensile property and fracture toughness of Al-Li alloy 2397-T87 rolled plate were investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, tensile and plane-strain fracture toughness tests. The results show that a pronounced texture variation through the plate thickness was found. Near the surface, Goss texture dominated. While in the center of the plate, typical β fiber texture and a scattering of cube texture were observed. And the subsurface layer exhibited a very weak texture. From the center to the subsurfac
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Zhang, Lian Meng, Li Chun Yu, Dao Ren Gong, and Qiang Shen. "Fabrication and Mechanical Properties of TZ-3Y20A /Mo Multilayer Composites." Materials Science Forum 492-493 (August 2005): 605–8. http://dx.doi.org/10.4028/www.scientific.net/msf.492-493.605.

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In the present work, TZ-3Y20A/Mo multilayer composites were prepared by sedimentation method. Appropriate settling parameters were chosen and green bodies of multilayer composites were obtained by settling TZ-3Y20A powder and Mo powder in turn according to the designed individual layer thickness. Then green laminates were hot pressed at 1773K for an hour under the pressure of 20MPa. Three-point Bending and Single Edge Notched Beam (SENB) tests were adopted to evaluate the flexure strength and fracture toughness of the samples. The results showed that, compared to TZ-3Y20A ceramics, the fractur
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36

Yan, Xingheng, Xingui Zhou, and Honglei Wang. "Effect of Additive Ti3SiC2 Content on the Mechanical Properties of B4C–TiB2 Composites Ceramics Sintered by Spark Plasma Sintering." Materials 13, no. 20 (2020): 4616. http://dx.doi.org/10.3390/ma13204616.

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B4C–TiB2 composite ceramics with ultra-high fracture toughness were successfully prepared via spark plasma sintering (SPS) at 1900 °C using B4C and Ti3SiC2 as raw materials. The results showed that compared with pure B4C ceramics sintered by SPS, the hardness of B4C–TiB2 composite ceramics was decreased, but the flexural strength and fracture toughness were significantly improved; the fracture toughness especially was greatly improved. When the content of Ti3SiC2 was 30 vol.%, the B4C–TiB2 composite ceramic had the best comprehensive mechanical properties: hardness, bending strength and fractu
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37

Yi, Ting. "Mechanical properties of a hierarchical honeycomb with sandwich walls." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 16 (2016): 2765–75. http://dx.doi.org/10.1177/0954406215602284.

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The in-plane compressive collapse and fracture toughness of a hierarchical hexagonal honeycomb with sandwich walls consisting of corrugated cores are studied by using finite element method. Its near-optimal configuration is identified by maximizing its elastic limit, which is determined by three competing failure modes including plastic yielding of the larger struts, or elastic wrinkling of the face sheets of the larger struts, or elastic buckling of the smaller struts. The overall mechanical properties of the optimal hierarchical honeycomb, including the Young’s modulus, elastic limit, peak s
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38

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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39

Chen, Jian, Wei Liu, Xin Deng, and Shanghua Wu. "Effects of Mo and Vc on the microstructure and properties of nano-cemented carbides." Science of Sintering 48, no. 1 (2016): 41–50. http://dx.doi.org/10.2298/sos1601041c.

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In this study, four unique groups of nano-cemented carbides with 8 wt.% Co and trace amount of Mo and VC have been successfully synthesized. The effect of Mo and VC has been investigated comprehensively on both the microstructure and mechanical behavior of nano-cemented carbide. The results show that Mo significantly increases hardness but decreases the fracture toughnesses and VC slightly increases hardness and strongly increases fracture toughness of nano-cemented carbide. It is found that the optimum Mo and VC contents are both 0.5 wt.%. The average WC grain size is about 370 nm. The hardne
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40

Alam, M. R., A. S. J. Swamidas, J. Gale, and K. Munaswamy. "Mechanical and physical properties of slate from Britannia Cove, Newfoundland." Canadian Journal of Civil Engineering 35, no. 7 (2008): 751–55. http://dx.doi.org/10.1139/l08-042.

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The experimental investigation described in this study was carried out to determine the physical and mechanical properties (elastic moduli, Poisson’s ratio, compressive and tensile strengths, hardness and plane strain fracture toughness) of slate quarried from Britannia Cove, Bonavista, Newfoundland, Canada. Microscopic observations were carried out to determine layers’ orientation and thickness and the grain boundaries. All tests were carried out according to American Society for Testing and Materials (ASTM) and International Society for Rock Mechanics (ISRM) procedures. The results obtained
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41

Hu, An Min, Kai Ming Liang, Feng Zhou, Fei Peng, and Guoliang Wang. "Crystallization and Mechanical Properties of Spodumene-Diopside Glass Ceramics." Key Engineering Materials 280-283 (February 2007): 1639–42. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1639.

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The mechanical properties of spodumene-diopside glasses ceramics with 4-12% TiO2 were investigated. The main crystalline phases precipitated were eucryptite, β-spodumene and diopside. As TiO2 content increasing, the morphology of glass ceramics transformed from coarse to fine microstructure, then to reverse. The flexural strength, elastic moduli, Vickers hardness and fracture toughness of the glass-ceramics were measured. The flexural strength of glass–ceramics containing 9%TiO2 was 198MPa, the Young’s modulus and fracture toughness were 91.3GPa and 2.3 MPa·m1/2 respectively. It was indicated
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42

Chou, Y.-S., J. W. Stevenson, T. R. Armstrong, J. S. Hardy, K. Hasinska, and L. R. Pederson. "Microstructure and Mechanical Properties of Sm1-xSrxCo0.2Fe0.8O3." Journal of Materials Research 15, no. 7 (2000): 1505–13. http://dx.doi.org/10.1557/jmr.2000.0216.

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The room temperature mechanical properties of a mixed conducting perovskite Sm1?xSrxCo0.2Fe0.8O3 (x = 0.2 to 0.8) were examined. Density, crystal phase, and microstructure were characterized. It was found that the grain size increased abruptly with increasing Sr content. Mechanical properties of elastic modulus, microhardness, indentation fracture toughness, and biaxial flexure strength were measured. Young's modulus of 180–193 GPa and shear modulus of 70–75 GPa were determined. The biaxial flexure strength was found to decrease with increasing Sr content from ∼70 to ∼20 MPa. The drop in stren
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Smith, Ryan Scott, Ting Y. Tsui, and Paul S. Ho. "Effects of ultraviolet radiation on ultra-low-dielectric constant thin film fracture properties." Journal of Materials Research 24, no. 9 (2009): 2795–801. http://dx.doi.org/10.1557/jmr.2009.0346.

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The effects of ultraviolet (UV) radiation on ultra-low-k dielectric (ULK) thin film fracture toughness were studied. This work discusses both critical and subcritical crack growth behavior under different environments. The critical fracture toughness was measured as a function of applied phase angle by using the four-point bend flexure and mixed-mode double cantilever beam techniques. Results of critical fracture toughness obtained under different loading configurations and phase angles were found to increase with the UV treatment time. In contrast, mode I subcritical fracture toughness thresh
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44

Xiang, Song, Jiang Ping Wang, Yu Ling Sun, Yong You Yan, and Shi Gang Huang. "Effect of Ageing Process on Mechanical Properties of Martensite Precipitation-Hardening Stainless Steel." Advanced Materials Research 146-147 (October 2010): 382–85. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.382.

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17-4PH precipitation-hardening martensite stainless steel is an important commercially available stainless steel. And the mechanical properties of this steel are very sensitive to quenching and aging process. In this paper, the effects of aging process on mechanical properties of this steel were investigated. The results show that the microstructure of this steel consists of quenched martensite, tempered martensite and precipitates. With the increase of the aging temperature, the strength decreases and the toughness increase. And the fracture mode of this steel transforms brittle fracture into
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45

Nambu, Shoichi, and Manabu Enoki. "Evaluation of Mechanical Properties of Alumina Green Compact during Sintering at Relative Low Temperature." Key Engineering Materials 297-300 (November 2005): 945–50. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.945.

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Recently, ceramics was used extensively as structural materials and ceramics components became larger and more complex. Fracture sometimes occurs during firing because of large and complex shape, and this fracture interrupts manufacturing process. The simulation of sintering has been studied to prevent this fracture. However, it was difficult to simulate fracture process because there was little data on strength of green compact. It is necessary to measure strength during sintering in order to perform a useful simulation. In this study, we measured strength of two kind of alumina green compact
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46

Seo, Dong Seok, Hwan Kim, Kyu Hong Hwang, and Jong Kook Lee. "Dissolution and Mechanical Properties of Sintered Hydroxyapatite Immersed in Water." Key Engineering Materials 317-318 (August 2006): 789–92. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.789.

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Dissolution of hydroxyapatite (HAp) in distilled water and related mechanical properties were investigated. The commercially obtained stoichiometric HAp powders were used as starting materials. After preparing powder compacts, the disks were sintered at 1200oC for 2 h in air with under moisture protection. The sintered specimens were then placed into 40 ml of 7.4 distilled water. After immersing for certain period of time at 37oC, weight loss, microstructure, and mechanical characteristics of the specimens were investigated. Fracture toughnesses were measured for both sintered and immersed HAp
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47

Pourhamid, Reza, and Ali Shirazi. "Microstructural evolution and mechanical behaviors of equal channel angular pressed copper." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 1 (2019): 171–79. http://dx.doi.org/10.1177/0954406219872520.

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The mechanical properties including Vickers hardness, tensile properties, fracture toughness, impact toughness and also, the microstructure of copper severely deformed by equal channel angular pressing through route C after two, four, and eight passes at ambient temperature, were studied in the present work. The results indicated that the grains size reduced from 16.7 to 4.8 µm after two and to 2.1 µm after eight passes. This study cleared that because of the recrystallization phenomenon and reducing the effect of stress concentration and increasing the number of grain boundaries, the values o
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48

Zidan, Saleh, Nikolaos Silikas, Abdulaziz Alhotan, Julfikar Haider, and Julian Yates. "Investigating the Mechanical Properties of ZrO2-Impregnated PMMA Nanocomposite for Denture-Based Applications." Materials 12, no. 8 (2019): 1344. http://dx.doi.org/10.3390/ma12081344.

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Acrylic resin PMMA (poly-methyl methacrylate) is used in the manufacture of denture bases but its mechanical properties can be deficient in this role. This study investigated the mechanical properties (flexural strength, fracture toughness, impact strength, and hardness) and fracture behavior of a commercial, high impact (HI), heat-cured denture base acrylic resin impregnated with different concentrations of yttria-stabilized zirconia (ZrO2) nanoparticles. Six groups were prepared having different wt% concentrations of ZrO2 nanoparticles: 0% (control), 1.5%, 3%, 5%, 7%, and 10%, respectively.
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Cui, Ning, Qianqian Wu, Kexiao Bi, Tiewei Xu та Fantao Kong. "Effect of Heat Treatment on Microstructures and Mechanical Properties of a Novel β-Solidifying TiAl Alloy". Materials 12, № 10 (2019): 1672. http://dx.doi.org/10.3390/ma12101672.

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The effect of heat treatment on the microstructures and mechanical properties of a novel β-solidifying Ti–43Al–2Cr–2Mn–0.2Y alloy was investigated. A fully lamellar (FL) microstructure with a colony size of about 100 μm was obtained by heat treatment at 1320 °C/10 min/furnace cooling (FC). A duplex (DP) microstructure with globular γ grains and γ/α2 lamellae was obtained by heat treatment at 1250 °C/4 h/FC. The residual hard–brittle β0 phase was also eliminated after heat treatment. The mechanical properties of the β-solidifying TiAl alloy depended closely on the heat treatment. The FL alloy h
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50

Azhar, Ahmad Zahirani Ahmad, Nik Akmar Rejab, Mohamad Hasmaliza, Mani Maran Ratnam, and Zainal Arifin Ahmad. "The Effects of Cr2O3 Addition on Fracture Toughness and Phases of ZTA Ceramic Composite." Advanced Materials Research 620 (December 2012): 35–39. http://dx.doi.org/10.4028/www.scientific.net/amr.620.35.

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Fracture toughness and phases of ceramic composites produced from alumina, yttria stabilized zirconia and chromia oxide system was investigated. The Cr2O3weight percent was varied from 0 wt% to 1.0 wt%. Each batch of composition was mixed, uniaxially pressed 13mm diameter and sintered at 1600 C for 4 h in pressureless conditions. Studies on on their mechanical and physical properties such as Vickers hardness and fracture toughness were carried out. Results show that an addition of 0.6 wt% of Cr2O3produces the best mechanical properties. Results of the highest fracture toughness is 4.73 MPa.m1/
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