Nickel–alumina interfacial fracture toughness using the thick foil technique

Tang, Shujun; Zehnder, Alan T.

doi:10.1016/s0013-7944(01)00094-7

Cited by 17 publications

(8 citation statements)

References 22 publications

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“…cooling time and this result almost agrees with previous study of joining graphite to Inconel 718, see Fig. (2) [16]. 3-For all joints, the maximum value of tensile stress using transient thermal analysis is lower than that of static analysis for (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) min. cooling range and this is related to introducing the elastic and plastic creep which is decreases with increasing cooling time [17], see Figs.(3-12).…”

Section: (9)supporting

confidence: 89%

“…Transient Axisymmetric finite element analysis reveals the following: 1-For all joints, the increase in maximum principal stress with increasing cooling time was observed and this is due to the fact that, when we relate the time of recrystallization to the recrystallization temperature. 2-The maximum value of tensile stress (using transient thermal analysis) along all joints appeared at Inconel/ graphite joints 3-For all joints, the maximum value of tensile stress using transient thermal analysis is lower than that of static analysis for (3)(4)(5)(6)(7)(8)(9)(10)(11)(12) min. cooling range.…”

Section: Discussionmentioning

confidence: 98%

“…Where C and B of equation (8) are ln R o and E/K, respectively. 2-The maximum value of tensile stress (using transient thermal analysis) along all joints appeared at Inconel / graphite joints and equal to (914MPa) at 18min.…”

Section: (9)mentioning

confidence: 99%

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Transition Analysis to Study the Effect of Cooling Rates on Thermal Stresses for Diffusion Bonded Joints

Abdullah

2013

JNUS

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In this work the analytical and numerical methods were used to calculate the residual stresses induced in the joint due to the deference in the physical and mechanical properties of the materials, cooling from bonding temperature to room temperature. The residual stresses induced in graphite may be become too high that the joint break down so it takes as major stress in the joint. It was found that the residual stress is affected by the joint geometry and the nickel interlayer thickness. The analytical calculation of the residual thermal stresses in graphite/Inconel 600 and Inconel 600/nickel interlayer/Graphite multilayered was done for bonding temperature T bond =800 o Cwith various nickel foil thickness, it found that increasing nickel thickness reduce the thermal residual stresses inside the graphite. Numerical method by FEM was used to estimate the distribution of the maximum residual stresses (first principle stress) in the joint. The results indicate that increasing nickel thickness reduces the maximum tensile residual stress. So the joint thicknesses with graphite (5 mm) /Ni (0.1-0.2)mm/ Inconel600 (5 mm) are convenient.

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Section: (9)supporting

confidence: 89%

Section: Discussionmentioning

confidence: 98%

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Transition Analysis to Study the Effect of Cooling Rates on Thermal Stresses for Diffusion Bonded Joints

Abdullah

2013

JNUS

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“…Similar conclusions were drawn in [29] after strength tests on an aluminum-nickel composition with an interface crack under asymmetric loading.…”

Section: A a Crack Under Shearsupporting

confidence: 82%

Initial kinking of an interface crack between two elastic media under tension and shear

2009

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The initial kinking of a thin fracture process zone near the tip of an interface crack between two elastic media under plane strain is studied using the Wiener-Hopf method. The zone is modeled by the discontinuity plane of the normal displacement. This plane is assumed to emerge from the crack tip at an angle to the interface. The angle between the fracture process zone and the interface is determined from the condition that the potential energy is maximum in the zone. The dependence of the length of the zone and its angle on the external load and other parameters is analyzed in the cases of biaxial tension and pure shear. The results obtained are compared with theoretical and experimental data reported by other researchers Keywords: interface crack, crack kinking, thin process zone, Wiener-Hopf method Introduction. The fracture mechanism for piecewise-homogeneous bodies with an interface crack is addressed, according to [25], in more than 500 publications most of which used mainly the classical approach, some allowed for the contact zones at the crack tips [2, 8-12, 24, 25, 27, 28], and some studied the fracture process zones at the edges of interphase cracks [1,4,5,[18][19][20]26].However, the issue of kinking of interphase cracks has poorly been studied in the literature, though relevant studies have intensified in the last two decades. Noteworthy are experiments on the kinking of an interface crack in polymer-metal and polymer-polymer composites [30], theoretical and experimental studies of the fracture of a metal-ceramic composite [11], and theoretical studies of crack kinking out of the interface between elastic media [24,25].Some of these studies [23,31] are based on the classic approach [28]: the crack is modeled by a cut at the interface between two linear elastic media without a fracture process zone. However, since the stresses and displacements near the edge of such a crack oscillate, it is difficult to determine the kink angle [11]. This is why a different approach was proposed in [24,25]. It is based on the contact crack model [9, 10, 12] that eliminates the oscillation by introducing zones where the crack edges come into contact near the tips.However, as follows from [12,24], the contact zone is extremely small (subatomic) under simple tension (mode I), which makes the methods of continuum mechanics inapplicable in such an important case. In this connection, it is advised in [24,25] to use this approach to study crack kinking under shear.The most promising way of studying the kinking of interface cracks under tension is to develop various Leonov-Panasyuk-Dugdale-type models of fracture process zones at the tips of interface cracks in materials of different physical nature [1,3,4,26]. As shown in [18,20], in this case the crack faces do not overlap and the fracture process zone is not so extremely small as in the contact model.The present paper, based on the earlier theoretical developments [20], calculates the kink angle for the fracture process zone at the edge of an interface crack using the exac...

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“…Many ideas have been proposed for the characteristic length, such as a size closed to the process zone by Ikeda (5) , the element size ahead of the crack tip by Bjerkén and Christer (6) , the crack length by Sun (7) and crossing point of log(σ n ) and log(σ s ) versus log(r) on the ligament region by Tang and Zehnder (8) . In this work, the element length 1.0 mm is taken as the characteristic length.…”

Section: Modified Interface Spring Model and Crack Clo-mentioning

confidence: 99%

Static Debonding Initiation Stress of Fiber Glass Composite

Gunawan

Homma

Kurniawati

et al. 2004

JSME Int. J., Ser. A

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Mesoscale debonding initiation stress of a bundle of glass fibers and epoxy matrix under static loading is investigated. A special cylindrical bar specimen was designed for the experiment. The specimen contains a bundle of glass fibers in the center and the bundle diameters were 1 and 2 mm. The fiber diameter is 7 µm. A static tension test was performed under the displacement control. The applied load-displacement curve was recorded for each specimen and then the debonding initiation load was defined as the deviation point from the linear curve. In addition, the debonding length was measured directly from the tested specimen. Using the debonding load measured from experiment, an axisymmetric finite element analysis is performed and debonding parameters K 1 and K 2 were computed. The results show the debonding initiation is fully dominated by an opening mode rather than a sliding mode and the stress intensity factor K 1 for the debonding initiation is 2.0E+05 Pa √ m. The mixed mode fracture takes place in the debonding propagation with constant mode mixity around 41.0 degree and the averaged stress intensity factors are 1.67E+05 Pa √ m and 1.41E+05 Pa √ m for the opening and the sliding mode, respectively.

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Nickel–alumina interfacial fracture toughness using the thick foil technique

Cited by 17 publications

References 22 publications

Transition Analysis to Study the Effect of Cooling Rates on Thermal Stresses for Diffusion Bonded Joints

Transition Analysis to Study the Effect of Cooling Rates on Thermal Stresses for Diffusion Bonded Joints

Initial kinking of an interface crack between two elastic media under tension and shear

Static Debonding Initiation Stress of Fiber Glass Composite

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