Fracture toughness prediction of low alloy steel as a function of specimen notch root radius and size constraints

Mourad, Abdel‐Hamid I.; El-Domiaty, A.; Chao, Yuh J.

doi:10.1016/j.engfracmech.2012.05.010

Cited by 31 publications

(7 citation statements)

References 54 publications

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“…Figure 2 shows tensile stress-strain curves for representative samples filled with size-1, size-2, and size-3 shale. The stress increases linearly with strain at the beginning with some nonlinearity before fracture [28][29][30]. Such nonlinearity disappeared with increasing the filler content.…”

Section: Tensile Testingmentioning

confidence: 99%

Mechanical behavior of Emirati red shale fillers/unsaturated polyester composite

2020

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Herein, we focus on the formulation of polymer-based heat insulators using natural local shale as a filler. The polymer composite was fabricated by blending unsaturated polyester resin with local natural Emirati shale of filler of different filler sizes and solidifying the obtained thermosetting blends. The prepared samples are subjected to compressive strength, flexural strength, and tensile strength tests. The obtained results indicate that these composites exhibit mechanical properties superior to those of commercial heat insulators and comparable with those of other building materials. Specially, the prepared composite features a much higher tensile strength (20-40 MPa) than conventional heat insulators (< 1 MPa).

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Section: Tensile Testingmentioning

confidence: 99%

Mechanical behavior of Emirati red shale fillers/unsaturated polyester composite

2020

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“…This is one of the reasons for initiating fatigue cracking under alternating or constant tension [9][10][11]. The cracks developed as a result propagate under severe load, and the fracture toughness of the welded material gets adversely affected [12][13][14][15][16][17][18]. Unfortunately, various element additions for increased mechanical performance, easiness of processing and application stability create sites susceptible to localized corrosion [19].…”

Section: Introductionmentioning

confidence: 99%

Optimization of metal inert gas-welded aluminium 6061 pipe parameters using analysis of variance and grey relational analysis

2020

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It is an underlying fact for the case of the joining process especially welding to have optimized parameters in order to achieve joints with outstanding mechanical characteristics. In the current work, aluminium 6061 pipes were welded using gas metal arc welding process with appropriate ER 4043 electrode and argon shielding gas. Optimum welding parameters (namely, current, voltage and travel speed) are investigated using analysis of variance ANOVA and grey relational analysis GRA statistical approaches. High tensile strength and low corrosion rate were set as required characteristics of quality welds. Since there are two responses and two objectives, multiple-criteria decision-making approach-GRA, and ANOVA are performed. Optimal parameters from these statistical approaches are converged to 110 A, 19 V and 3 cm/ min, respectively. It is deduced from this study that the optimal parameters are convergent irrespective of the two used techniques for the investigated experimental data.

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“…Some studies [38][39][40][41][42] showed that for values of ρ lower than a critical value (critical ρ), the value for the apparent K will not change, meaning that a small value for ρ will allow to obtain a good similarity with K IC obtained from a fatigue fracture sample (with ρ = 0).…”

Section: Discussionmentioning

confidence: 99%

Fracture toughness of the interface between Ni–Cr/ceramic, alumina/ceramic and zirconia/ceramic systems

Porto

Parente

Jorge

et al. 2016

Fatigue Fract Eng Mat Struct

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A B S T R A C T Few studies have focused on the interface fracture performance of bi-layered structures, which have an important role in dental restorations, using ceramic materials. The purpose of this study is to evaluate the fracture mechanics performance of the Ni-Cr/ceramic, alumina/ceramic and zirconia/ceramic interfaces by investigating the propagation of an interfacial crack under a wide range of mode mixities. The effect of the mechanical properties of the base materials and the interface, on the crack initiation and crack path, will also be studied. The finite element method (FEM) was used to calibrate the production of the experimental specimens, allowing to obtain the minimum dimensions and amounts of material needed to correctly characterize the fracture event. The specimens were tested until failure using a three-point bending test machine. The interface fracture parameters were obtained using the FEM. For all specimens, the cracks propagated into the ceramic.The results suggest that, in Ni-Cr/ceramic, alumina/ceramic and zirconia/ceramic bilayered structures, the ceramic is weaker than the interface, which can be used to explain the clinical phenomenon that the ceramic chipping rate is larger than interface delamination rate. Consequently, a ceramic material with a larger fracture toughness is needed to decrease the failure rate of ceramic restorations.Keywords dental ceramic; finite element analysis; fracture toughness. N O M E N C L A T U R Ea = average notch length B = specimen thickness E = Young modulus/elastic modulus ERR = energy release rate F = maximum load FEM = finite element method G = ERR of kinking crack G 0 = ERR of interface crack K = complex interface crack SIF K = K 1 + iK 2 k = material constant K 1 = real part of interface crack SIF K 2 = imaginary part of interface crack SIF K I = real part of kinking crack SIF K IC = plane strain fracture toughness K II = imaginary part of kinking crack SIF K Q = stress intensity LEFM = linear elastic fracture mechanics S = distance between load points SEM = scanning electron microscope

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Fracture toughness prediction of low alloy steel as a function of specimen notch root radius and size constraints

Cited by 31 publications

References 54 publications

Mechanical behavior of Emirati red shale fillers/unsaturated polyester composite

Mechanical behavior of Emirati red shale fillers/unsaturated polyester composite

Optimization of metal inert gas-welded aluminium 6061 pipe parameters using analysis of variance and grey relational analysis

Fracture toughness of the interface between Ni–Cr/ceramic, alumina/ceramic and zirconia/ceramic systems

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