The method of fracture toughness measurement of brittle materials by means of high speed camera and DIC

Brynk, Tomasz; Laptiev, Anatolii; Тоlochyn, О. І.; Pakieła, Zbigniew

doi:10.1016/j.commatsci.2012.05.025

Cited by 20 publications

(11 citation statements)

References 9 publications

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“…The elastic modulus ( E ), bending yield strength ( σ y ), flexural strength ( σ F ), and fracture toughness ( K 1C ) values were calculated using Eqs.

E = \frac{F_{m a x} L^{3}}{4 δ b d^{3}}

σ_{y} = \frac{3 F_{y} L}{2 b d^{2}}

σ_{F} = \frac{3 F_{m a x} L}{2 b d^{2}}

K_{I C} = \frac{3 F_{m a x} L}{2 b d^{2} Y (|, \frac{a}{b}) \sqrt{a}}

where

Y (|, \frac{a}{b}) = 1.93 - 3.07 (|, \frac{a}{b}) + 14.5 {(\frac{a}{b})}^{2} + 25.1 {(\frac{a}{b})}^{3} + {25.8 (\frac{a}{b})}^{4}

where F y is the yield force, F max is the maximum force applied, L is the distance between the supports, δ is the deflection of the tested specimen, b is the width of the tested specimen, d is the height of...…”

Section: Methodsmentioning

confidence: 99%

Removable partial denture alloys processed by laser‐sintering technique

et al. 2017

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Removable partial dentures (RPDs) are traditionally made using a casting technique. New additive manufacturing processes based on laser sintering has been developed for quick fabrication of RPDs metal frameworks at low cost. The objective of this study was to characterize the mechanical, physical, and biocompatibility properties of RPD cobalt-chromium (Co-Cr) alloys produced by two laser-sintering systems and compare them to those prepared using traditional casting methods. The laser-sintered Co-Cr alloys were processed by the selective laser-sintering method (SLS) and the direct metal laser-sintering (DMLS) method using the Phenix system (L-1) and EOS system (L-2), respectively. L-1 and L-2 techniques were 8 and 3.5 times more precise than the casting (CC) technique (p < 0.05). Co-Cr alloys processed by L-1 and L-2 showed higher (p < 0.05) hardness (14-19%), yield strength (10-13%), and fatigue resistance (71-72%) compared to CC alloys. This was probably due to their smaller grain size and higher microstructural homogeneity. All Co-Cr alloys exhibited low porosity (2.1-3.3%); however, pore distribution was more homogenous in L-1 and L-2 alloys when compared to CC alloys. Both laser-sintered and cast alloys were biocompatible. In conclusion, laser-sintered alloys are more precise and present better mechanical and fatigue properties than cast alloys for RPDs. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1174-1185, 2018.

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“…The elastic modulus ( E ), bending yield strength ( σ y ), flexural strength ( σ F ), and fracture toughness ( K 1C ) values were calculated using Eqs.

E = \frac{F_{m a x} L^{3}}{4 δ b d^{3}}

σ_{y} = \frac{3 F_{y} L}{2 b d^{2}}

σ_{F} = \frac{3 F_{m a x} L}{2 b d^{2}}

K_{I C} = \frac{3 F_{m a x} L}{2 b d^{2} Y (|, \frac{a}{b}) \sqrt{a}}

where

Y (|, \frac{a}{b}) = 1.93 - 3.07 (|, \frac{a}{b}) + 14.5 {(\frac{a}{b})}^{2} + 25.1 {(\frac{a}{b})}^{3} + {25.8 (\frac{a}{b})}^{4}

Section: Methodsmentioning

confidence: 99%

Removable partial denture alloys processed by laser‐sintering technique

et al. 2017

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“…12 Strain field of a Specimen A and b Specimen B at point B Fig. 13 Strain field of a Specimen A and b Specimen B at point C was randomly distributed, while in the y direction, a higher strain value appeared at the interlayer position of the two layers of glass plates.…”

Section: Displacement Field and Strain Field Distribution Of Laminated Glassmentioning

confidence: 99%

“…1. Subsequently, a black/white paint was randomly applied to the side of the specimens for measuring the displacement and strain fields [13].…”

Section: Specimen Preparationmentioning

confidence: 99%

Acoustic Emission Monitoring for Bending Failure of Laminated Glass Used on Glass Water Slide

Liu

Shen

Zhang

et al. 2021

Lecture Notes in Mechanical Engineering

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In recent years, a new kind of amusement ride called glass water slide has been rapidly increasing. As a key component of this ride, laminated glass may be subject to all kinds of applied loads, which impose safety risks. In addition, the test data and evaluation method for laminated glass used on glass water slide is not enough. To address this issue, a method combining acoustic emission (AE) with digital image correlation (DIC) is used to monitor the damage and deformation under three-point bend loading conditions. The results show that the lower tempered glass is broken when loaded to the maximum bending load (about 16kN), then the load dropped rapidly. Afterward, the bending load is restored to about 8kN, at the moment, the upper tempered glass is broken, which indicated the tempered glass completely failure. For the laminated glass with bonding defects, more AE signals with higher amplitude value are generated during the load process. The strain concentration and severe displacement deformation are observed when the upper and lower parts of the glass fail. The distribution characteristics of the displacement and strain fields can be well correlated with the amplitude and frequency distribution of the AE signals, revealing the whole process of the damage evolution of the laminated glass. It is suggested that the complementary technology combining AE with DIC is effective for damage monitoring and evaluation of the laminated glass.

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“…A combination of DIC and high-speed camera has been used to investigate metals at high strain rates in uniaxial tests [7], by Split Hopkinson bar methods [8] or by 3-point bending methods to receive the stress intensity factor on a brittle metallic composite [9]. In these investigations 0.05 Mfps was the fastest recording speed.…”

Section: Sebastian Myslicki Markus Ortlieb Gerrit Frieling and Franmentioning

confidence: 99%

High-precision deformation and damage development assessment of composite materials by high-speed camera, high-frequency impulse and digital image correlation techniques

Myslicki¹,

Ortlieb²,

Frieling³

et al. 2015

Materials Testing

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Although composite materials like wood, vulcanized fiber and carbon reinforced plastic (CFRP) are already investigated by means of their mechanical properties, the abrupt fracture mechanism as well as the deformation behavior right before and after fracture has not been investigated. However, it is marginally investigated for CFRP because of the quite high fracture speed. The knowledge about the damage evolution as the crack start and propagation can help to improve the strength and sensitivity to fracture by improving the materials structure and to utilize these materials for structural applications. For the investigated materials, fracture happens abruptly as it is the nature of composites and the detailed fracture mechanisms could not be detected by conventional measurement techniques. Therefore, an innovative combination of testing devices is presented which is able to fill this gap. Tensile tests were performed to receive conventional stress-strain curves. At the fracture stage, a high-speed camera recorded the fracture process. This information could be combined with digital image correlation (DIC) to visualize the deformation behavior. At the same time acoustic emission (AE) was used to detect the spectrum of mechanical vibrations which gives information about the released energy due to fracture. The challenging triggering of the high-speed camera was solved for each material individually. By using improved light sources, the recording speed could be set up to 2 million frames per second (Mfps). The investigations show different fracture mechanisms for each composite. Wood and vulcanized fiber were also investigated in different directions due to their anisotropy.

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The method of fracture toughness measurement of brittle materials by means of high speed camera and DIC

Cited by 20 publications

References 9 publications

Removable partial denture alloys processed by laser‐sintering technique

Removable partial denture alloys processed by laser‐sintering technique

Acoustic Emission Monitoring for Bending Failure of Laminated Glass Used on Glass Water Slide

High-precision deformation and damage development assessment of composite materials by high-speed camera, high-frequency impulse and digital image correlation techniques

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