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fracture toughness testing

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Journal Articles
AM&P Technical Articles (2013) 171 (11): 13–18.
Published: 01 November 2013
...Tom McGaughy; Fabian Orth This article identifies several factors that are not fully addressed in most fracture toughness test standards and explains how they may influence calculated values obtained from ferritic steels. Of particular consequence are test temperatures within the ductile-to-brittle...
Journal Articles
AM&P Technical Articles (2014) 172 (4): 19–23.
Published: 01 April 2014
...Xiang (Frank) Chen; Randy K. Nanstad; Mikhail A. Sokolov; Eric T. Manneschmidt Ductile fracture toughness testing is useful for evaluating a material’s structural integrity. This article briefly reviews three widely used J-integral vs. crack growth resistance (J-R) curve test methods for metals...
Journal Articles
AM&P Technical Articles (2019) 177 (2): 27–30.
Published: 01 February 2019
... Consultants LLC, Knoxville, Tenn. Jin-Song Liu, Shenyang Ligong University The J-integral versus crack-growth resistance curve (J-R curve) is a useful tool for evaluating material fracture toughness in the ductile region[1]. A widely accepted practice for conducting J-R curve testing is ASTM standard E1820[2...
Journal Articles
AM&P Technical Articles (2020) 178 (2): 20–24.
Published: 01 February 2020
... 68 82 152 148 154 Avg. absorbed energy, J 75 151 Result Qualified 23 (a) (b) ADVANCED MATERIALS & PROCESSES | FEBRUARY/MARCH 2020 Fig. 6 (a) fracture position in weld joints in tensile tests and (b) SEM image of fracture surface. (a) (b) (c) (d) Fig. 7 (a) Macrostructures of impact test specimen...
Journal Articles
AM&P Technical Articles (2012) 170 (9): 24–26.
Published: 01 September 2012
... toughness (-160ºC test temperature). Argonshielded welds absorbed 71% of the energy that the base material absorbed, while nitrogen welds performed better, absorbing 94% of the energy. Microporosity present in the fracture face of argonshielded weld specimens may have contributed to their lower WCL...
Journal Articles
AM&P Technical Articles (2017) 175 (6): 23–26.
Published: 01 September 2017
... are optimized to maximize toughness. During micro and nanoscale testing, the CVD coating did not fracture after 100 nano-impacts, and a diamond cube corner indentation failed to induce cracks (Fig. 4). Its fracture toughness exceeded the level that can be measured by methods commonly used on hard coatings...
Journal Articles
AM&P Technical Articles (2012) 170 (1): 24–27.
Published: 01 January 2012
... mapping of SEM image showing silicon signal in red (top right); EDS elemental mapping of SEM image showing aluminum signal in green (bottom left); and SEM image showing iron signal in green (bottom right). Joint test results Joined assemblies were fractured using a three point-bend test and the braze...
Journal Articles
AM&P Technical Articles (2016) 174 (3): 21–23.
Published: 01 March 2016
..., and shear tests. Other tests are used to characterize properties related to inhomogeneity, such as interlaminar fracture toughness, which measures resistance to delamination. Creep and fatigue testing is needed to predict the long-term durability of a material in service. It is often necessary to understand...
Journal Articles
AM&P Technical Articles (2013) 171 (8): 19–23.
Published: 01 August 2013
... 400,000 600,000 800,000 Time (s) Fig. 3 Load (blue) and crack mouth opening displacement (CMOD) behavior (red) during the incremental step loading setup is shown in Fig. 1. To test AA5083 specimens in the fracture mechanics setup, an adaptation of incremental step loading, ASTM F1624 09 was used...
Journal Articles
AM&P Technical Articles (2015) 173 (1): 34–37.
Published: 01 January 2015
... such as ASTM A-36. In addition, weld testing on plate thicknesses from 0.20 up to 0.75 in. of higher strength marine (EH-36) and structural (ASTM A709-Gr 50) steels exhibits good strength, ductility, and fracture toughness (Fig. 5). Hobart Metal Cor 6 welding wire was used during testing, along with an argon...
Journal Articles
AM&P Technical Articles (2014) 172 (5): 23–27.
Published: 01 May 2014
... microstructure, a higher volume fraction of the B2 phase results in an increase of strength, ductility, and fracture toughness. The B2 phase can decompose into 2 and O by aging, with the higher aging temperature causing a decrease in strength and increase in ductility. For the B2 phase, higher Al content...
Journal Articles
AM&P Technical Articles (2013) 171 (9): 20–25.
Published: 01 September 2013
... heat treatment Heat treatment steps for spinodal decom- position include: TABLE 2 PROPERTIES OF COPPER NICKEL TIN SPINODAL ALLOY PRODUCTS Tensile elongation Hardness CVN impact strength K1c fracture toughness Product forms Alloy UNS C96970 ToughMet 2 CX UNS C96900 ToughMet 3 CX UNS C72900 ToughMet 3...
Journal Articles
AM&P Technical Articles (2015) 173 (1): 31–33.
Published: 01 January 2015
... in sheet product, while doubling Fig. 4 DonJoy OA nano orthopedic knee brace. elongation and fatigue strength and increasing fracture toughness (Fig. 3). In a heat treatment study conducted with researchers at the University of Michigan, low textures were found to improve cold formability[7]. The new...
Journal Articles
AM&P Technical Articles (2018) 176 (2): 26–28.
Published: 01 February 2018
... including wear, fatigue, creep, and fracture toughness are listed in Fig. 1. This article discusses examples from various industries where new materials and surface modifications are used to extend the useful life of engineering components and equipment. Fig. 1 Variables affecting predictable...
Journal Articles
AM&P Technical Articles (2015) 173 (4): 24–27.
Published: 01 April 2015
... incurred. In cases where there is disagreement over who is to blame, the dispute might go to a court of law where several important aspects of the failure analysis (FA) are tested, discussed, and judged. Aspects to consider include: Did the investigative FA methodolo- gy follow accepted scientific...
Journal Articles
AM&P Technical Articles (2024) 182 (2): 24–28.
Published: 01 March 2024
... temper are often used for skins due to their superior fracture toughness and fatigue properties. The skins are attached to the circular frames that form the barrel of the fuselage. Longitudinal stringers (or longerons) support the skin. The stringers are made from either rollformed sheet or thin extruded...
Journal Articles
AM&P Technical Articles (2016) 174 (3): 16–20.
Published: 01 March 2016
... fraction is effective in preserving high-temperature properties. Strengthening is also induced through incoherent oxide particles such as in Al-Mg and Fig. 1 Modeled temperature distribution within a combustion engine[2]. 17 Al-Ti systems, but resulting alloys have low ductility and fracture toughness...
Journal Articles
AM&P Technical Articles (2013) 171 (3): 19–22.
Published: 01 March 2013
... elongation. This result is only for simple tensile loading; it is expected that the higher oxygen content would negatively impact properties such as fracture toughness and fatigue. Because the design of the BALD bracket is limited by strength, mechanical properties were deemed adequate for production...
Journal Articles
AM&P Technical Articles (2016) 174 (2): 26–27.
Published: 01 February 2016
... missiles upon launching set back the U.S. defense effort by several years. It was brought under control after research on steel cleanliness, improved welding techniques, new tools for nondestructive testing to locate defects in the interior of metals, and a new approach to fracture toughness technology...
Journal Articles
AM&P Technical Articles (2014) 172 (3): 22–24.
Published: 01 March 2014
... safety both rely on sound welds. The stress state at the weld, fracture toughness of the weldment, and presence of pores, cracks, and embrittled regions in AHSS are driving factors resulting in different failure modes compared to conventional steels particularly interfacial type failures[1]. Traditional...