Relevant bibliographies by topics / Facture toughness

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Facture toughness'

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

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Journal articles on the topic "Facture toughness"

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Kuang, Jia Cai, Hong Lei Wang, Xin Gui Zhou, and Ying Jun Deng. "Fracture Toughness of CNTs/AlN Ceramics Tested by Indentation." Advanced Materials Research 177 (December 2010): 151–53. http://dx.doi.org/10.4028/www.scientific.net/amr.177.151.

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CNTs/AlN ceramics were fabricated by hot-pressing sintering process. The fracture toughness was measured by indentation method. The morphologies of indentation cracks were analyzed by SEM. The results show that the facture toughness of AlN was slightly improved because appreciate toughening mechanisms such as CNTs pull-out, crack bridging and deflect operate in CNTs/AlN. In addition, the facture toughness of CNTs/AlN increased with increasing CNTs content up to 3wt%. Then, the fracture toughness decrease when the CNTs content is 4wt%.
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Gu, Sidi, and Zhao Qiang Zeng. "Synthesis and Properties of Al2O3 Nanocomposite Ceramics Toughened by Nano Metallic Particles." Key Engineering Materials 280-283 (February 2007): 1099–102. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1099.

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Al2O3/Ni composite ceramics toughened by metallic particles was fabricated by the vacuum reduction of Al2O3 and nickel nitrate (Ni(NO3)2•6H2O) mixed powders at 800-1000° for 2-4h and hot pressed at 1400° ~ 1500°C for 1-2h. Three-point bending strength and facture toughness of the composite were studied. With the increase of Ni content, its flexural strength and facture toughness increases significantly. Microstuctural investigations of the composite revealed that fine nickel particles dispersed homogeneously at the matrix grain boundaries, forming the intergranular nanocomposite.
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Chen, Y. L., B. Liu, Y. Huang, and K. C. Hwang. "Fracture Toughness of Carbon Nanotube-Reinforced Metal- and Ceramic-Matrix Composites." Journal of Nanomaterials 2011 (2011): 1–9. http://dx.doi.org/10.1155/2011/746029.

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Hierarchical analysis of the fracture toughness enhancement of carbon nanotube- (CNT-) reinforced hard matrix composites is carried out on the basis of shear-lag theory and facture mechanics. It is found that stronger CNT/matrix interfaces cannot definitely lead to the better fracture toughness of these composites, and the optimal interfacial chemical bond density is that making the failure mode just in the transition from CNT pull-out to CNT break. For hard matrix composites, the fracture toughness of composites with weak interfaces can be improved effectively by increasing the CNT length. However, for soft matrix composite, the fracture toughness improvement due to the reinforcing CNTs quickly becomes saturated with an increase in CNT length. The proposed theoretical model is also applicable to short fiber-reinforced composites.
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Qi, Hong Yu, Xiao Guang Yang, and Rui Li. "Interfacial Fracture Toughness of APS Thermal Barrier Coating under High Temperature." Key Engineering Materials 348-349 (September 2007): 181–84. http://dx.doi.org/10.4028/www.scientific.net/kem.348-349.181.

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Thermal barrier coating (TBC) is an essential requirement of a modern gas turbine engine. The TBC failure is the delamination and spallation. The oxidation damage under high temperature results in the reduction of interfacial adhesion. The interfacial fracture toughness is an important property to analyze the TBC failure. The interfacial fracture toughness of ceramic coating - bond coating has been researched in the past. However, the facture toughness of the bond coating - substrate due to the Al depletion was very few studied. In this study, a NiCrAlY bond coating by air plasma spray (APS) was deposited. The substrate was directionally solidified superalloy (DZ40M). Isothermal oxidation was performed at 10500 for 100h. Using the HXZ-1000 micro-hardness equipment, the five different times was chosen to test the hardness and the crack length, and then the fracture toughness was obtained. While the oxidation exposure time increased at 10500, the hardness of the substrate close to the bond coating decreased with the increase of the bond coating’ hardness. Meanwhile, the interfacial fracture toughness of the bond coating - substrate decreased because of the Al depletion.
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Shukla, Dharmendra Kumar, Pankaj Sonia, and Vijay Verma. "Characterization of Fracture Properties of Epoxy-Alumina Polymer Nanocomposite." Applied Mechanics and Materials 390 (August 2013): 557–61. http://dx.doi.org/10.4028/www.scientific.net/amm.390.557.

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Polymer nanocomposites (PNC) were prepared by in-situ polymerization technique. Rod shape alumina nanoparticles of two different sizes; i) having an average diameter in the range of 10 nm and length less than 50 nm and ii) having diameter in the range of 20-40 nm and length in the range of 200-400 nm; were selected as reinforcement material for epoxy matrix. PNCs having 0.5 %, 1 %, and 1.5 % weight fraction of alumina nanorods were prepared. Transmission electron micrographs (TEM) of the nanocomposites showed good dispersion of alumina nanoparticles in the epoxy. The quasi static plane strain fracture toughness of the PNCs was determined. Addition of both the types of alumina nanoparticles gives good improvement in the facture toughness of epoxy. An increment of 34% in fracture toughness was observed for composites having smaller size alumina nanorods at 1.5 wt.% over that of neat epoxy whereas fracture toughness was improved by 56 % for composites having alumina nanorods of higher aspect ratio at the same weight fraction. Scanning electron microscopic (SEM) images of the fracture surfaces were analyzed to investigate the mechanisms responsible for the increase in the fracture toughness of the PNCs.
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Chan, Kwai S. "Fracture Resistance in Multiphase Alloys." Key Engineering Materials 345-346 (August 2007): 611–18. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.611.

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The fracture behavior of Nb-based in-situ composites is reviewed to elucidate the effects of alloy additions on the fracture process in multiphase alloys. The overview paper summarizes the current understanding of the processes by which alloying addition and microstructure alter the near-tip deformation and fracture mechanism, and presents a methodology for predicting the fracture toughness of the constituent phases and the composite. The alloying effects observed in Nb-based in-situ composites can be attributed to changes in dislocation mobility in the metallic solid solution matrix that provides ductile phase toughening in the composites. The size, volume fraction, and the continuity of the intermetallic phases dictate the fracture path and impact significantly the facture toughness of the in-situ composites.
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Blugan, Gurdial, Richard Dobedoe, I. Gee, Nina Orlovskaya, and Jakob Kübler. "Failure Behaviour of High Toughness Multi-Layer Si3N4 and Si3N4-TiN Based Laminates." Key Engineering Materials 290 (July 2005): 175–82. http://dx.doi.org/10.4028/www.scientific.net/kem.290.175.

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Multi-layer laminates were produced using alternating layers of Si3N4 and Si3N4+TiN. The differences in the coefficient of thermal expansions between the alternating layers lead to residual stresses after cooling. These are compressive in the Si3N4 layers and tensile in the Si3N4+TiN layers. The existence of these stresses in the laminates effect the crack propagation behaviour during failure. Different designs of laminates were produced with external layers under compression and tension exhibiting different failure mechanisms. Facture toughness was measured by SEVNB method. In systems with external layers under compression the measured fracture toughness was up to three times that of Si3N4, i.e. up to 17 MPa m1/2. In systems with external layers under tension during failure the energy absorbing effects of crack deflection and crack bifurcation were obtained. High temperature tests were performed to determine the onset temperature for residual stresses in these laminates. Micro-laminates with compressive layers of only 30 µm thickness with high strength and fracture toughness and were manufactured.
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Kalam, Anizah, Aidah Jumahat, Z. Salleh, and Koay Mei Hyie. "Mechanical Properties and Fracture Toughness of Alkali Treated Oil Palm Fruit Bunch (OPFB) Fibre/Epoxy Composites." Applied Mechanics and Materials 390 (August 2013): 521–25. http://dx.doi.org/10.4028/www.scientific.net/amm.390.521.

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Mechanical properties of oil palm fruit bunch (OPFB) fibre composites have been quite extensively research by many researchers. However fracture toughness of this composite is still not fully understood. Hence this research used Sodium hydroxide (NaOH) at three different concentrations (1%, 3% and 5%) to treat the Oil palm fruit bunch (OPFB) fibre to investigate the effects of alkali treatment on the mechanical properties and facture toughness of OPFB fibre/epoxy composites. Tensile and fracture tests results indicate that the 3% NaOH concentration gave the best mechanical properties. An increase of 12% and 18% were observed for tensile and flexural moduli, meanwhile the increament of 9% was observed for tensile strength. However no increase on flexural strength was observed due to the OPFB treatment. Suggestion has been made to further study on the NaOH concentration in the range of 2% - 4%.
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Pham, Hai Vu, and Makoto Nanko. "Crack-Healing Function of Nano-Ni/(ZrO2+Al2O3) Hybrid Materials." Materials Science Forum 804 (October 2014): 179–82. http://dx.doi.org/10.4028/www.scientific.net/msf.804.179.

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Ni/(ZrO2+Al2O3) nanocomposites have excellent mechanical properties, as well as self-healing function. The powder preparation was conducted by drying slurry consisting of distilled water, Al2O3, 3 mol % Y2O3doped ZrO2and nickel nitrate. After reduction at 600°C in a stream of Ar-1% H2, the powder mixture was consolidated by pulsed electric current sintering (PECS) at 1300°C for 5 min under 50 MPa. Surface cracks were generated by Vickers indentation on the polished surface of the test samples. Ni/(YZ+Al2O3) shows 1200 MPa in bending strength and 6.1 MPa m1/2in facture toughness. Crack-healing and oxidation tests were conducted at temperature ranging from 1100 to 1300°C in air. As a result, crack-disappearance occurred slightly faster than that of Ni/Al2O3.
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SADASUE, Teruki, Tsunehisa HANDA, Kohichi TANIGUCHI, Tetsuya TAGAWA, and Rinsei IKEDA. "Effect of sheet thickness on facture behavior of resistance spot welding joints in high strength steel sheets and dominant factors for fracture toughness." QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 36, no. 4 (2018): 253–63. http://dx.doi.org/10.2207/qjjws.36.253.

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Dissertations / Theses on the topic "Facture toughness"

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Morsi, Khaled M. B. E. "Mechanical properties of particle reinforced alumina." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320644.

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Ma, Wei. "Fracture toughness characterization of thin Ti/SiC composites." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/9324.

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Titanium based alloys reinforced uniaxially with silicon carbide fibres (Ti/SiC) are advanced and innovative materials for aerospace vehicles. To avoid potential problems, these new materials should be extensively tested and analyzed before application. This research focuses on experimental fracture toughness study on 0.5 mm thick Ti/SiC composite materials for aerospace applications. The fracture toughness tests are mainly based on BS 7448 with some modifications for transversely isotropic behaviour of the composite materials. By loading on specimens in the direction perpendicular to the fibre axis, three critical values of fracture toughness parameters characterizing fracture resistance of material, plane strain fracture toughness [Plane strain fracture toughness }, critical crack tip opening displacement [Critical crack tip opening displacement ] and critical J-integral [Critical at the onset of brittle crack extension or pop-in when Δa is less than 0.2 mm. ]are measured for two kinds of titanium alloy specimens and three kinds of Ti/SiC composites specimens. The values of [Provisional value of Plane strain fracture toughness ] obtained from the fracture toughness tests are not valid [Plane strain fracture toughness ] for these materials, since the thickness of specimens is insufficient to satisfy the minimum thickness criterion; however, the results could be used as particular critical fracture toughness parameter for 0.5 mm thick structures of the materials. The valid values of [Critical J at the onset of brittle crack extension or pop-in when Δa is less than 0.2 mm. ] and [Critical crack tip opening displacement ] could be used as fracture toughness parameters for all thickness of structures of the materials. The results also show that: fracture toughness of the titanium alloys decreases dramatically after being unidirectional reinforced with SiC fibre, which is mainly triggered by poor fibre/matrix bonding condition. Moreover, Ti-Al3-V2.5 reinforced with 25% volume fraction SiC fibre performs better than the other two composites in fracture resistance.
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Tsikopoulos, Nicholas. "Toughness and factors in graphs." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59616.

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The author proved independently, every 2-tough graph is hamiltonian (3), that if G is a K-tough graph with n vertices and if kn is even then G has a k-factor (4) is best possible by showing that for every positive integer k and for every positive $ varepsilon$ there is a (k-$ varepsilon$)-tough graph G with no k-factor; furthermore, if k is odd then G can be made to have an even number of vertices; this result makes chapter 1 of the present thesis.
Enomoto elaborated further on the subject and gave two results, in (4) and (5) respectively, which are improvements over (4):
(5) provided that k$ vert$G$ vert$ is even and $ vert$G$ vert sbsp{=}{>}$ k + 1, G has a k-factor if, for each set S of vertices, G-S has at most $ vert$S$ vert$/k + 7/8 components; and (6) provided that k$ vert$G$ vert$ is even and $ vert$G$ vert sbsp{=}{>}$ k$ sp{2}$ + 1, G has a k-factor if, for each set S of vertices, G-S has at most $ vert$S$ vert$/k + 1 components. The proofs of (4), (5) and (6) make chapters 2, 3 and 4 respectively.
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Stamp, Elizabeth. "Mental toughness and health-related lifestyle factors." Thesis, University of Lincoln, 2017. http://eprints.lincoln.ac.uk/28659/.

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Mental toughness (MT) originated within elite sport and was identified as an attribute of success. MT has emerged as being important for enhancing health-related lifestyle factors (HRLF; e.g., physical activity). Investigating the healthiness of one’s lifestyle appears a timely area to research given the current health status of the population. Therefore, the aim of this thesis was to investigate MT in relation to HRLF and weight loss. Study One investigated MT and HRLF in university students (n = 167). Self-reported MT, physical activity, exercise barriers, dietary behaviour, and psychological wellbeing were recorded. MT was significantly different between regular exercisers (M = 3.43 ± .42) and non-regular exercisers (M = 3.24 ± .54, p < .05). Components of eating identity, exercise barriers, and psychological wellbeing, were significantly correlated with MT. Study Two longitudinally investigated weight loss progress, and adherence to a weight loss support group, in slimming club members who were pursuing a weight loss goal (n = 132). MT and eating identity were assessed at baseline, three-months, and six-months, and weight was recorded at weekly meetings. Overall MT was not significantly related to weight loss (r = -.15, p > 0.05) or adherence to the service (r = .03, p > 0.05). Study Three sampled individuals who held a weight loss goal, but were not attending a weight loss support club (n = 78). Overall MT was not significantly related to weight loss (r = -.21, p > 0.05). MT was not significantly different between weight loss goal achievers (M = 3.62 ± .49) and non-goal achievers (M =3.42 ± .38, p > 0.05). Thus, irrespective of whether structured support is received, overall MT was not related to weight loss progress. II Study Four investigated the experiences of high (n = 9) and low (n = 7) mentally tough individuals pursing a weight loss goal. High and low MT individuals, identified using the MTQ48, were interviewed. Thematic analysis revealed that amongst the high mentally tough individuals, those who prioritised leading a healthy lifestyle reported weight loss success compared to those who prioritised other goals. Strategies to overcome low levels of MT (e.g., control), as well as receive additional support, appeared crucial for successful weight loss in low MT individuals. Study Five further investigated the low MT individuals’ (n = 7) perceptions, experiences, and attitudes, towards weight loss. Low MT individuals were sampled based on their MT score assessed via the MTQ48. Vignette based interviews extended the findings in Study Four. Thematic analysis revealed key findings, including the potential to change low MT individuals’ perceptions to enhance behaviour change. Overall, this thesis expanded the understanding of MT; the processes that one experiences when trying to lose weight appears to differentiate between high and low MT individuals, which offers an explanation as to why MT did not appear to play a significant role in weight loss outcomes. These findings challenged the predominant contemporary understanding of MT and demonstrated that MT was not associated with behaviour change to achieve weight loss.
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Stonkus, Mark. "The development and validation of the Inventory of Mental Toughness Factors in Sport (IMTF-S)." Thesis, Boston University, 2011. https://hdl.handle.net/2144/32837.

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Thesis (Ed.D.)--Boston University
PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
The purpose of this study was to develop and validate a new measure of mental toughness in sport. The role of mental toughness in sport has been characterized as key in assisting athletes to obtain success by optimizing practice, overcome failures, and develop the mental skills necessary to win (Norris, 1999). A literature review concluded with six concepts (hardiness, coping, self-efficacy, mindset, resilience, and optimism) being used to develop an 80-item instrument measuring mental toughness on a 5-point Likert scale (always-never). Athletes (N=359, 195 males, 164 females, mean age = 17.57, SD = 3.4) drawn from a variety of sports were administered the Inventory of Mental Toughness Factors in Sport (IMTF-S) during the spring of 2011. Item analysis and principal component analysis yielded a four-factor 48-item model with an overall reliability (Cronbach's alpha) score of .925. The mental toughness factors and corresponding reliability scores were labeled as follows: Identification (.933), Negation (.812), Determination (.765), and Motivation (.890). Test-retest reliability measures were also obtained on a sample of 25 athletes (r= .892). Concurrent validity was demonstrated (r= .798, p ≤ .001) by comparing a set of scores (N= 75) on the IMTF-S and the Psychological Performance Inventory (PPI; Loehr, 1986). Predictive validity was assessed by comparing means of three sample's scores with ratings of their respective coaches. One independent samples t-test on a high school boys lacrosse team (N=18) indicated that the IMTF-S may have predictive properties (p= .021), however two other samples (women's elite field hockey, N=19) and junior A ice hockey (N=24) revealed non-significant findings when coaches ratings were compared to athlete self-assessment. Finally, correlation analysis found no significant relationships between mental toughness and age or experience. The results of this study provide empirical evidence for the valid use of the IMTF-S in measuring mental toughness in athletes. Perhaps of greater importance is that this study bolsters the existing research on mental toughness and further promotes its identification and development in assisting athletes in overcoming high-pressured and adverse conditions in their sporting environments.
2031-01-01
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Gwin, Mary Elizabeth. "Factors affecting the impact toughness of ultra low carbon steel weld metal." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA320665.

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Alpay, Ceyda. "Investigation Of Geometrical Factors For Determining Fracture Toughness With The Modified Ring Test." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609883/index.pdf.

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Modified Ring specimens are of the shape of discs having a hole inside and flattened ends. These specimens are used for determination of Mode I fracture toughness. Finite element program, named ABAQUS, is used for numerical modeling for finding stress intensity factors. Varying disc geometries were used for the experiments and numerical modeling in which size of the flat ends, radius of the hole inside, and external radius of the specimen were varied. Experiments were done by using pink Ankara andesite. Effects of internal hole radius, external disc radius and size of the flat ends on both stress intensity factor and fracture toughness were studied. In order to compare the results, fracture tests with semi-circular specimens under three point bending (SCB) were also performed. From a similar previous study, fracture toughness values of gray andesite were recalculated and compared to the fracture toughness values of pink andesite for varying geometrical factors. Size effect studies were performed as well for varying diameter of core specimens.Fracture toughness values of andesite were found to increase with increasing specimen size. Fracture toughness of 100 mm specimens was determined as 1.11±
0.07 MPa&
#8730
m, whereas fracture toughness of 75 mm specimens was 0.96±
0.08 MPa&
#8730
m. 100 mm or larger diameter specimens were suggested for the fracture toughness determination with the modified ring tests.
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Het, Kivanc. "Effects Of Geometrical Factors On Fracture Toughness Using Semi-circular Bending Type Specimens." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609320/index.pdf.

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Semi-circular specimens (SCB) under three point-bending which are commonly used for fracture testing of rocks were used here for fracture mechanics tests. A total of 65 specimens were tested by using Ankara andesite rock. Investigations including the effects of initial notch thickness, different loading span ratios (S/R), flattened loading end, and little dimensional variations when preparing the specimens were carried out. Stress intensity factors for specimens with different geometries were computed individually by using a 3D finite element program ABAQUS. Specimens with a preliminary notch thickness varying from 0.84 to 3.66 mm were tested under three point bending. For a second group of specimens loading span was changed and fracture toughness variation was studied. Another change in the specimen geometry was made by machining a flat loading end at the upper load application point. Fracture toughness values were computed using the stress intensity values computed from numerical modeling and failure loads from the experiments. It was found that up to 2 mm fracture toughness was not affected by variations in the thickness of preliminary notches. Fracture toughness was not affected by changing the loading span. For specimens with flat loading ends, fracture toughness was about 16% lower than the value found from regular SCB type specimens loaded at a point at the top by a steel roller. As a result of about 46 experiments average fracture toughness of Ankara Gö
lbasi andesite was found as 1.36 MPa .
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Van, Slyke Jonathon J. "Factors affecting the strength and toughness of ultra-low carbon steel weld metal." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA374133.

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Thesis (Degree of Mechanical Engineer) Naval Postgraduate School, December 1999.
"December 1999". Thesis advisor(S): A.G. Fox. Includes bibliographical references (p. 63-64). Also available online.
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Baker, Frank W. Jr. "Mental Toughness: Effect on Factors Associated with Injury and Illness in Adolescent Athletes." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1407271208.

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Books on the topic "Facture toughness"

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Hart, P. H. M. Offshore pipeline girth welds: The factors influencing mechanised MIG weld metal toughness. London: HMSO, 1988.

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Gwin, Mary Elizabeth. Factors affecting the impact toughness of ultra low carbon steel weld metal. Monterey, Calif: Naval Postgraduate School, 1996.

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Slyke, Jonathon J. Van. Factors affecting the strength and toughness of ultra-low carbon steel weld metal. Monterey, Calif: Naval Postgraduate School, 1999.

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Towers, O. L. Test for fracture toughness and fatigue assessment: A compilation of stress intensity, compliance, and elastic n factors. Cambridge, England: Welding Institute, 1985.

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Chan, Ho Yin. Factors influencing the izod impact toughness of filled polypropylene. 1987.

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Factors Affecting the Impact Toughness of Ultra Low Carbon Steel Weld Metal. Storming Media, 1996.

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Factors Affecting the Strength and Toughness of Ultra-Low Carbon Steel Weld Metal. Storming Media, 1999.

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Towers, O. L. Tests for fracture toughness and fatigue assessment: A compilation of stress intensity, compliance and elastic n factors. Welding Institute, 1985.

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Book chapters on the topic "Facture toughness"

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Clair-Thompson, Helen St, and Sarah Mcgeown. "Mental Toughness." In Non-cognitive Skills and Factors in Educational Attainment, 331–53. Rotterdam: SensePublishers, 2016. http://dx.doi.org/10.1007/978-94-6300-591-3_15.

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Popovich, V. A., and I. M. Richardson. "Fracture Toughness of Welded Thick Section High Strength Steels and Influencing Factors." In TMS2015 Supplemental Proceedings, 1031–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093466.ch125.

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Popovich, V. A., and I. M. Richardson. "Fracture Toughness of Welded Thick Section High Strength Steels and Influencing Factors." In TMS 2015 144th Annual Meeting & Exhibition, 1031–38. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48127-2_125.

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Zhu, Linli, Haci Mehmet Baskonus, and Wei Gao. "A Variant of Sun Toughness and the Existence of Path Factors in Networks." In Machine Learning for Cyber Security, 12–19. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-62460-6_2.

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Figueroa, Jesús Gerardo Martínez, and Perla Itzel Alcántara Llanas. "Fracture Toughness of Fiber Metal Laminates Through the Concepts of Stiffness and Strain-Intensity-Factor." In Proceedings of the 17th International Conference on New Trends in Fatigue and Fracture, 313–28. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70365-7_37.

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Huh, Yong, Sung Keun Cho, Hyung Ick Kim, and Chang Sung Seok. "Plastic-Factor for the Fracture Toughness Test of the SA508Cl.1a Narrow-Gap Welding Part." In Key Engineering Materials, 146–49. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.146.

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Nishimoto, Soya, Michiaki Yamasaki, Shin-ichi Inoue, and Yoshihito Kawamura. "Investigation of Microstructural Factors Affecting the Plane-Strain Fracture Toughness of Mg–Zn–Y–Al Alloys Processed by Consolidation of Rapidly Solidified Ribbons." In The Minerals, Metals & Materials Series, 71–77. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72432-0_8.

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Anand, Lallit, and Sanjay Govindjee. "Linear elastic fracture mechanics." In Continuum Mechanics of Solids, 485–505. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198864721.003.0026.

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This chapter introduces the basics of linear elastic fracture mechanics. It starts by recalling the asymptotic elastic crack tip solutions and the concept of stress intensity factors for Mode-I, Mode-II, and Mode-III loading. The concept of critical stress intensity factor is next introduced as a model for fracture under small scale yielding conditions. In this context the limits of linear elastic facture mechanics are discussed. Further, methods and requirements for fracture toughness testing are discussed.
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"Core Properties and Case Depth." In Carburizing, 135–70. ASM International, 1999. http://dx.doi.org/10.31399/asm.tb.cmp.t66770135.

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Abstract The design of case-hardened components is an iterative process, requiring the consideration of multiple interrelated factors. This chapter walks readers through the steps involved in selecting an appropriate material and assessing the influence of alloy composition and cooling rate on core properties including hardenability, microstructure, tensile and yield strength, ductility, toughness, and fatigue resistance. It likewise explains how carbon affects case hardenability, surface hardness, and case toughness and how case depth influences residual stresses and bending and contact fatigue. It also discusses the effect of quenching methods and addresses the issue of distortion.
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Pico, Manuel Viseras, Rafael González-Palma, María Carmen Carnero, Carlos López-Escobar, and David Almorza. "Fatigue Fracture, CTOD, and CVN Testing in Heat-Affected Zone of High Strength Low Alloy Steels." In Advanced Models and Tools for Effective Decision Making Under Uncertainty and Risk Contexts, 90–156. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-3246-1.ch004.

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High strength low alloy steels (HSLA) are currently used in large quantities for constructions in the North Sea and elsewhere. For success operation under such rigorous conditions, it is essential to ensure adequate weld metal toughness at temperatures of -10ºC or even lower is used. To comply with this high requirement, the heat input control is needed to avoid forming martensitic microstructure in high strength low alloy steels (HAZ) near to the fusion line during weldment cooling. This work carried out CTOD tests to ensure that, under welding conditions, the fatigue crack, toughness, hardness, and resilience in the HAZ are acceptable with the standards. Crack size in accordance with number cycles will be represented as the crack growth rate da/dN vs. stress intensity factor amplitude.
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Conference papers on the topic "Facture toughness"

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Wolodko, John, and Mark Stephens. "Applicability of Existing Models for Predicting Ductile Fracture Arrest in High Pressure Pipelines." In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10110.

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The ductile fracture arrest capability of gas pipelines is seen as one of the most important factors in the future acceptance of new high strength pipeline steels for high pressure applications. It has been acknowledged for some time that the current methods for characterizing and predicting the arrest toughness for ductile fracture propagation in high strength steels are un-conservative. This observation is based on the inability of existing models to predict the required arrest toughness in full-scale ductile fracture propagation tests. While considerable effort is currently being applied to develop more accurate methods for predicting ductile facture arrest, the resulting models are still in a preliminary stage of development and are not immediately amenable for use by the general engineering community. As an interim solution, a number of authors have advocated the empirical adjustment or reformulation of the existing models for use with the newer, high strength pipe grades. While this approach does not address the fundamental issues surrounding the fracture arrest problem, it does provide methods that can be used in the near term for analysis and preliminary design. The desire to use these existing methods, however, is tempered by the uncertainty associated with their applicability in situations involving high pressures and/or high toughness materials. In an attempt to address some of these concerns, a statistical analysis was conducted to assess the accuracy of a number of available fracture arrest models by comparing predictions to actual values determined from full-scale fracture propagation experiments. From the results, correction factors were developed for determining the required toughness levels in high pressure applications that account for the uncertainty in the theoretical prediction methods.
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Chang, Shih-Jung. "A Fracture Probability Integral for Pressure Vessel Life Estimate and Accident Analysis." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25968.

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A multiple integral representation has been developed to analytically model the probability of failure of reactor vessel. The probability of fracture is a basic methodology for projecting for the life of a new vessel as well as to estimate the remaining life of an existing vessel. The integral representation for the probability of fracture calculation is based on the number count of critical cracks across the whole section of a vessel, based on a given calibrated crack distribution function, obtained by experimental examination of the vessel cross section. Multiple integral is implemented because of the degraded, or variable, fracture toughness and other factors representing the variable facture toughness. For example, the nuclear reactor vessel that is subjected to neutron radiation, will increase the reactor vessel steel brittleness. The effect of neutron irradiation can be calibrated by its increase in ductile-brittle transition temperature (DBTT) in fracture toughness versus temperature curve. Higher DBTT implies a decrease in fracture toughness and an increase in the chance of vessel fracture in brittle fracture mode. The extent of degradation that the High Flux Isotope Reactor (HFIR) vessel has experienced is characterized by its probability of fracture in this paper. The fracture probabilities under the accident pressure conditions against possible HFIR operating life are calculated for the safety analysis of the reactor vessel. Conventional numerical methods of fracture probability calculation such as that adopted by the NRC-sponsored PRAISE CODE and the FAVOR CODE developed in this Laboratory are based on Monte Carlo simulation. Heavy computations are required. The present method of Probability Integral has been used to verify numerical results of approximately 8–10 reports on HFIR remaining-life calculations by Cheverton using FAVOR CODE for the installation of HFIR new cold neutron source. The numerical result based on the method of Probability Integral confirms almost exactly as compared with that obtained by Monte Carlo Method adopted by FAVOR CODE. This Method of Probability Integral, because of its analytical structure, shows the clear physical interpretation of the fracture probability. It provides simple and expedient procedure to obtain numerical values of fracture probability. Moreover, it retains all possible features that the Monte Carlo Method of simulation can accomplish.
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Amano, Toshihiko, Satoshi Igi, Takahiro Sakimoto, Takehiro Inoue, and Shuji Aihara. "Fracture Behavior in West Jefferson Test Under Low-Temperature Condition for X65 Steel Pipe With High Charpy Energy: Current Activities in HLP Committee, Japan, Report 1." In 2016 11th International Pipeline Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ipc2016-64308.

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This paper describes the results of pressure vessel fracture test which called West Jefferson and/or partial gas burst testing using Grade API X65 linepipe steel with high Charpy energy that exhibits inverse facture in the Drop Weight Tear Test (DWTT). A series of pressure vessel fracture tests which is as part of an ongoing effort by the High-strength Line Pipe committee (HLP) of the Iron and Steel Institute of Japan (ISIJ) was carried out at low temperature in order to investigate brittle-to-ductile transition behavior and to compare to DWTT fracture behavior. Two different materials on Fracture Appearance Transition Temperature (FATT) property were used in these tests. One is −60 degree C and the other is −25 to −30 degree C which is defined as 85 % shear area fraction (SA) in the standard pressed notch DWTT (PN-DWTT). The dimensions of the test pipes were 24inches (609.6 mm) in outside diameter (OD), 19.1 mm in wall thickness (WT). In each test, the test pipe is cooled by using liquid nitrogen in the cooling baths. Two cooling baths are set up separately on the two sides of the test vessel, making it possible to obtain fracture behaviors under two different test temperatures in one burst test. The test vessel was also instrumented with pressure transducers, thermocouples and timing wires to obtain the pressure at the fracture onset, temperature and crack propagation velocity, respectively. Some informative observations to discuss appropriate evaluation method for material resistance to brittle facture propagation for high toughness linepipe materials are obtained in the test. When the pipe burst test temperatures are higher than the PN-DWTT transition temperature, ductile cracks were initiated from the initial notch and propagated with short distance in ductile manner. When the pipe burst test temperatures were lower than the PN-DWTT transition temperature, brittle cracks were initiated from the initial notch and propagated through cooling bath. However, the initiated ductile crack at lower than the transition temperature was not changed to brittle manner. This means inverse facture occurred in the PN-DWTT is a particular problem caused by the API DWTT testing method. Furthermore, results for the pipes tested indicated that inverse facture occurred in PN-DWTT at the temperature above the 85 % FATT may not affect the arrestability against the brittle fracture propagation and it is closely related with the location of brittle fracture initiation origin in the fracture appearance of PN-DWTT.
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Gao, Zengliang, Yuebing Li, and Yuebao Lei. "A Comparison Between Probabilistic and Deterministic Fracture Mechanics Assessments of the Structural Integrity of a Reactor Pressure Vessel Subjected to a Pressurized Thermal Shock Transient." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97569.

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Both probabilistic and deterministic methods are used in structural integrity assessment of reactor pressure vessels (RPV) under pressurized thermal shock (PTS) conditions. The deterministic assessment is normally performed using flaw assessment procedures based on linear elastic or elastic-plastic fracture mechanics. Over the past two decades, the probabilistic assessment approach, which is based on probabilistic fracture mechanics (PFM), has undergone continuous development, mostly driven by the desire to address some of the weaknesses of the deterministic approach and to facilitate increasing the life and safety of nuclear power plants. In this paper, structural integrity assessments for a selected RPV subjected to a typical PTS transient are performed using the deterministic approach according to different flaw assessment codes. The failure probabilities corresponding to the deterministic facture mechanics method with defined safety factors are evaluated and compared with the failure probability value determined using the PFM method. Several sources of uncertainty that affect the assessment of the structural integrity of an RPV under PTS, including uncertainties in the material property values, the fracture toughness and the flaw size are incorporated in the failure probability evaluation. The response distribution of crack driving force is obtained from the PFM analysis and the failure probability is calculated using Monte Carlo simulation, where the failure criteria used in the deterministic assessment are adopted. The results of analysis from the two approaches are compared and discussed. The results show that the defined safety factor in the deterministic methods does affect the limit failure probability implied by the method. However, there is no unique relationship between safety factor and the limit failure probability.
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Aryanto, Dian Bagus, and Ajeng Larasati. "Factors Influencing Mental Toughness." In Proceedings of the 5th ASEAN Conference on Psychology, Counselling, and Humanities (ACPCH 2019). Paris, France: Atlantis Press, 2020. http://dx.doi.org/10.2991/assehr.k.200120.066.

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Erdelen-Peppler, Marion, Christoph Kalwa, and Alexander Völling. "Understanding Inverse Fracture: A Comparison of Results of Drop Weight Tear Tests and Partial Gas Tests." In 2018 12th International Pipeline Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipc2018-78686.

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For a safe operation of gas pipelines, the prevention of propagating brittle facture is one of the most important requirements. To evaluate the transition temperature of a propagating fracture, the Drop Weight Tear (DWT) Test was developed in the 60s. Fracture surfaces of DWT specimens have been shown to correspond well to the fracture surface of a pipe exposed to a propagating fracture at a certain temperature. Historically, there have always been observations of the fracture initiating in a ductile manner in the DWT test. Nevertheless, the most widely used test standard rules out such behavior, known as inverse or abnormal fracture. As an option to prevent ductile initiation, an alternative notch is proposed. While this might have served in the earlier days, high toughness steels of today are known to provide a high resistance against crack initiation and are therefore prone to inverse fracture, even when making use of the suggested alternative notch. Other, non-standard notch types have been investigated and discussed in literature, amongst these the static pre-crack and brittle weld notch. Observations of the DWT test, especially comparing material showing non-inverse and inverse behaviour, show delayed crack initiation resulting in large deflection when the specimens are inverse. This high degree of pre-deformation of the material will have an adverse influence on the material performance by the time the crack propagates into it. This implies that the appearance of inverse fracture is a test effect in the laboratory test, and not an inherent material property, leading to the question if such DWT test results still correspond to the behavior of pipes. If the correlation is shown to be valid, the brittle initiation requirement as such becomes questionable. This study summarises investigations of different notch types in DWT tests. West Jefferson tests that have been conducted to verify the correlation to shear area fraction in DWT tests. The investigation revealed that ductile initiation could not be reliably suppressed. While neither Chevron nor static pre-crack specimen lead to any reduction of the occurrence of inverse fracture, test series of brittle weld specimens did have a higher number of valid specimens. Interestingly, the results of valid, non-inverse specimens and invalid, inverse specimens showed no shift in transitional behavior. Correspondingly, both valid and invalid specimens showed a good representation of the pipe behaviour in the upper transition region.
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Xu, S., R. Bouchard, and W. R. Tyson. "Flow Behaviour and Ductile Fracture Toughness of a High Toughness Steel." In 2004 International Pipeline Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ipc2004-0192.

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This paper reports results of tests on flow and ductile fracture of a very high toughness steel with Charpy V-notch absorbed energy (CVN energy) at room temperature of 471 J. The microstructure of the steel is bainite/ferrite and its strength is equivalent to X80 grade. The flow stress was determined using tensile tests at temperatures between 150°C and −147°C and strain rates of 0.00075, 0.02 and 1 s−1, and was fitted to a proposed constitutive equation. Charpy tests were carried out at an initial impact velocity of 5.1 ms−1 using drop-weight machines (maximum capacity of 842 J and 4029 J). The samples were not broken during the test, i.e. they passed through the anvils after significant bending deformation with only limited crack growth. Most of the absorbed energy was due to deformation. There was little effect of excess energy on absorbed energy up to 80% of machine capacity (i.e. the validity limit of ASTM E 23). As an alternative to the CVN energy, the crack tip opening angle (CTOA) measured using the drop-weight tear test (DWTT) has been proposed as a material parameter to characterize crack propagation resistance. Preliminary work on evaluating CTOA using the two-specimen CTOA test method is presented. The initiation energy is eliminated by using statically precracked test specimens. Account is taken of the geometry change of the specimens (e.g. thickening under the hammer) on the rotation factor and of the effect of strain rate on flow stress.
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Choi, Shin-Beom, Young-Jin Kim, and Yoon-Suk Chang. "Fracture Toughness Estimation of Miniature Specimens by Considering Geometry Effects." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25588.

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Since small-sized specimens are widely used for fracture toughness tests to assure safety of a reactor pressure vessel in service, as a part of surveillance program, various geometry parameters affecting on the stress level near the crack-tip should be investigated for realistic assessment of cleavage fracture behavior. The aim of the present paper is to improve the current master curve method for typical miniature specimens, especially pre-cracked Charpy V-notched (PCVN) specimens. In this context, effects of thickness and side-grooves were quantified from comparing finite element (FE) analyses results in use of various PCVN specimens with and without side-grooves. Then, a scale factor to deal with geometry effects was suggested by employing the fracture toughness diagram, which was derived from FE analyses data of compact tension specimens and PCVN specimens. The scale factor was applied to calculate equivalent stress intensity factors influencing on the reference temperature embodied in the master curve method. The approach proposed in this paper will be useful to estimate fracture toughness of PCVN specimen made of SA508 carbon steel.
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Zhu, Xian-Kui, and Tom McGaughy. "Assessing Low-Constraint Fracture Toughness Test Methods Using Clamped SENT Specimens." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93088.

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Abstract The low-constraint fracture toughness can be measured using a single edge-notched tension (SENT) specimen in the clamped-end conditions. The SENT specimen has been used in the oil and gas industry in the strain-based design and the crack assessment for transmission pipelines. Since 2006 when DNV published the first SENT test practice, many investigations have been done, and various SENT test methods were developed, including CANMET and ExxonMobil methods in terms of the J-integral and CTOD. The effort led to the first SENT test standard BS 8571 being published in 2014. However, the experimental evaluation methods remain in developing, and different methods may determine inconsistent results. For this reason, the present paper gives a brief review on SENT fracture testing and assesses the available test methods, including progresses on study of stress intensity factor, geometric eta factors, elastic compliance equation, and constraint m factor as well. The difference between J-converted CTOD and double clip gage measured CTOD is also discussed. On those bases, agreements and challenges in SENT testing are identified. The results provide a direction for further investigation to improve the current SENT test methods.
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Li, Yuebing, Weiya Jin, Zengliang Gao, Zhenyu Ding, and Yuebao Lei. "Characteristic Values of Fracture Toughness Test Data." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63891.

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Fracture toughness of reactor pressure vessel materials appears obvious scatter. It is desirable in assessment codes to characterize fracture toughness by a low fractile of its distribution. This low fractile is known as a characteristic value. However, the real distribution type is unknown, and usually assumed to be normal, lognormal or Weibull. In this paper, the characteristic values with given confidence level and probability are obtained by one-sided tolerance factors for normal, lognormal and Weibull distribution. These characteristic values are compared with that obtained with minimum of three equivalent.
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Reports on the topic "Facture toughness"

1

Blackburn, J. M. Factors Affecting the Strength and Toughness of Low Carbon Alloy Steel Weld Metal. Fort Belvoir, VA: Defense Technical Information Center, November 1998. http://dx.doi.org/10.21236/ada363763.

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