Measuring residual stress and its influence on properties of porous ZrO2/(ZrO2+Ni) ceramics

Zhou, Wenbin; Zhou, Hao; Zhang, Rubing; Pei, Yongmao; Fang, Daining

doi:10.1016/j.msea.2014.11.018

Cited by 33 publications

(19 citation statements)

References 31 publications

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“…A large number of researchers have turned their attention to FGMs. Some of them focused on the analysis of the production process of these materials as well as on the modelling and simulation of the process [2][3][4][5][6] while others turned their attention to the inevitably generated residual stresses of FGMs due to thermal mismatch of each basic material using experimental and analytical methods [7,8] or their characterization [1]. Over time, a number of techniques have been developed in order to obtain FGMs: Powder metallurgy, vapor deposition, solid free form fabrication, centrifugal casting, and additive manufacturing [9,10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Aluminum Alloy–Silicon Carbide Functionally Graded Materials Developed by Centrifugal Casting Process

et al. 2021

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The continuous development of modern industries rises the necessity for functionally graded materials. This research starts from the consideration that the incorporation of SiC particles in the molten aluminum alloy can be difficult due to the very low wettability of SiC particles. In order to increase their wettability, SiC particles were covered with a layer of metallic copper. The incorporation of SiC particles into the aluminum alloy mass was performed by centrifugal casting. The secondary hypoeutectic Al-Si alloy used in this study was elaborated within the crucible of a resistors heated furnace. The metallic coating of SiC particles, in addition to the effect of increasing their wettability by molten metal, also has a role in preventing the formation of aluminum carbide in case of heating above 700 °C. A great amount of attention was paid to the parameters used during the centrifugal casting process. The results showed that adjusting the proportion of SiC particles within the composite allows us to obtain values of the thermal expansion coefficient within previously established limits. The present work demonstrates that the coating of SiC particles covered with a thin layer of metallic Cu creates the conditions to easily incorporate them into the molten Al mass, thus obtaining FGMs with controlled properties.

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Section: Introductionmentioning

confidence: 99%

Characterization of Aluminum Alloy–Silicon Carbide Functionally Graded Materials Developed by Centrifugal Casting Process

et al. 2021

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“…Microstructures and properties of the porous ZrO 2 /(ZrO 2 þ Ni) sandwich ceramics were experimentally studied in our previous work [11][12]. Then a finite element model is established to verify the correctness of the analytical model.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling of thermal residual stresses and optimal design of ZrO2/(ZrO2+Ni) sandwich ceramics

Zhou

Zhang

et al. 2015

Ceramics International

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The joining of ceramics with metals have been extensively used in applications requiring high strength and excellent heat insulation. However, evaluating the residual stress generated inevitably due to the mismatch in coefficients of thermal expansion of ceramic and metal is challenging, which is very important for fabrication and characterization of layered inhomogeneous material. A simplified analytical model considering the overall deformation compatibility is established to compute the interlaminar residual stresses of the ZrO 2 /(ZrO 2 þNi) sandwich ceramics, which agrees well with the results obtained by the commercial finite element package. The effects of the thickness ratio of the transitional layer to the middle layer, and the number of transitional layers on the properties of the ZrO 2 /(ZrO 2 þNi) sandwich ceramics are researched to obtain the optimal structure.

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“…The most potential dangerous locations of the bolted joint are the interface between the bearing load layer (ZrO 2 þ 30 vol.%Ni) and the transition layer (ZrO 2 þ 15 vol.%Ni), and the root of the first thread, which are shown in Fig. 5a and are marked as locations B and C. This is because the residual thermal stress at location B is the maximum tensile stress, which can be seen in our previous work [22]. Besides, stress concentration is the most severe at location C. In the present work, we only give results of three representative situations, namely, Little preload (15 MPa), Critical preload (33.5 MPa) and Big preload (50 MPa).…”

Section: Transient Thermodynamic Behaviormentioning

confidence: 76%

“…For example, the ceramicemetal FGMs can be designed to take advantages of the mechanical strength of metals and the heat and corrosion resistance of ceramics [19,20]. In our previous work, we fabricated and experimentally investigated the microstructure and thermomechanical properties of the porous ZrO 2 /(ZrO 2 þ Ni) ceramics and found that they had a low thermal conductivity and high strength [21,22]. Therefore, the ceramicemetal FGMs can be a potential candidate for heat shorts blocking joints.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and thermodynamic analysis of the porous ZrO2/(ZrO2 + Ni) functionally graded bolted joint

Zhou

Chen

et al. 2015

Composites Part B: Engineering

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a b s t r a c tCeramicemetal functionally graded materials (FGMs) have been extensively used in aerospace engineering where high strength and excellent heat insulation materials are desired. In this paper, the thermodynamic behavior of the Thermal Protection System (TPS) used bolted joints made up of porous ZrO 2 /(ZrO 2 þ Ni) FGMs is investigated by finite-element (FE) modeling. The bolted joint is subjected to reentry heating corresponding to the Access to Space Vehicle. Thermodynamic simulations are carried out to yield the transient response of the porous ZrO 2 /(ZrO 2 þ Ni) functionally graded bolted joint (FGBJ). The effects of the preload on the thermomechanical behavior and service reliability of the bolted joint are numerically analyzed in detail by ABAQUS codes. It is found that the preload relaxation of the bolted joint occurs at elevated temperature, and the preload has significant influence on service reliability of the bolted joint under transient thermomechanical circumstances. With the increase of the preload, stress concentration which occurs at the root of the first thread of the bolt increases rapidly and predominates in service reliability. Proper preload is thus defined to balance the service reliability and tightness of the bolted joint. Further studies show that the shape of the nut has a great effect on the stress concentration of the thread, the optimized nut is designed to reduce the stress concentration of the thread, and thus the reliability of the bolted joint is also improved.

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Measuring residual stress and its influence on properties of porous ZrO2/(ZrO2+Ni) ceramics

Cited by 33 publications

References 31 publications

Characterization of Aluminum Alloy–Silicon Carbide Functionally Graded Materials Developed by Centrifugal Casting Process

Characterization of Aluminum Alloy–Silicon Carbide Functionally Graded Materials Developed by Centrifugal Casting Process

Analytical modeling of thermal residual stresses and optimal design of ZrO2/(ZrO2+Ni) sandwich ceramics

Preparation and thermodynamic analysis of the porous ZrO2/(ZrO2 + Ni) functionally graded bolted joint

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