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Publications (45)
Ultra-high-temperature materials have applications in aerospace and nuclear industry. They are usually subjected to complex thermal environments during service. The mechanical properties of materials in ultra-high-temperature environments have been attracted increasing attentions. However, the characterization and evaluation of ultra-high-temperatu...
Carbon fiber reinforced silicon carbide (C/SiC) composites are usually subjected to thermal-mechanical-oxidation-coupled loads during service. However, their mechanical properties at ultra-high temperatures in oxidizing environments have rarely been reported. In this paper, a method based on the induction heating technology is proposed for testing...
Carbon fiber reinforced silicon carbide (C/SiC) composites are enabling materials for components working in ultra-high-temperature extreme environments. However, their mechanical properties reported in the literature are mainly limited to room and moderate temperatures. In this work, an ultra-high-temperature testing method for the mechanical prope...
Advanced 2D carbon fiber reinforced silicon carbide (C/SiC) composites are highly advantageous, owing to the excellent temperature tolerance of carbon and the good oxidation resistance of SiC. Therefore, they have been regarded as the most promising thermal structural materials that operate in thermal shock environments. However, studies pertaining...
Advanced carbon-carbon composites (C/Cs) are tailored materials exhibiting properties designed to fit the end demands. However, as a kind of fiber reinforced materials, C/Cs have complex internal structures and various manufacturing defects which evolve with temperature. In addition, the micro-nano structures of the carbon fiber reinforcements and...
Hierarchical structures have been viewed as promising candidates to offer superior performance compared to regular structures. In this study, six hierarchical honeycombs are constructed by replacing each joint of regular hexagonal and square honeycombs in three different ways. Numerical simulations are performed to study the out-of-plane dynamic cr...
Ultra-high-temperature materials have been widely used as key components in high-end equipments. However, the existing studies are mainly conducted at room and moderate temperatures. Besides, they are mainly carried out by experiments. Theories on the temperature dependence of fracture strength are rarely reported. In this work, experimental method...
Carbon fiber reinforced silicon carbide (C/SiC) composites are of the few most promising materials for ultra-high-temperature structural applications. However, the existing studies are mainly conducted at room and moderate temperatures. In this work, the tensile properties of a two-dimensional plain-weave C/SiC composite are studied up to 2300 °C i...
The compressive properties of chemical vapor deposited zinc sulfide are studied up to 1050°C for the first time. The specimen with columns parallel to the compression direction fails by shear firstly and then the part below the slip plane is split. The fracture mode changes from intergranular to transgranular as temperature increases. During compre...
Carbon fiber reinforced silicon carbide (C/SiC) composites usually serve in ultra-high-temperature extreme environments and are subjected to thermal-mechanical-oxidation coupled loads. However, the mechanical properties of C/SiC composites reported in the literature are mainly limited to room and moderate temperatures. In this work, the tensile pro...
Carbon bonded carbon fiber (CBCF) composites with different fiber volume fractions (FVFs) are prepared. This paper mainly investigates the effect of FVFs and the ultra-high temperature on the mechanical and thermal properties of CBCF composites. Experimental results show that the microstructure of CBCF composites is anisotropic, random distribution...
The flexural properties of carbon-carbon composites (C/Cs) are studied up to 2600 °C for the first time. The results show that the bending strength firstly increases with temperature up to 2000 °C, then decreases moderately to 2300 °C, and finally decreases rapidly to 2600 °C. The temperature dependence of bending strength is related to the bonding...
In this paper, MoSi2, MoSi2-20 vol% (ZrB2-20 vol% SiC) and MoSi2-40 vol% (ZrB2-20 vol% SiC) ceramics were prepared using pressureless sintering. The oxidation behaviors of these MoSi2-(ZrB2-SiC) ceramics were investigated at 1600 °C for different soaking time of 60, 180 and 300 min, respectively. The oxidation behaviors of the MoSi2-(ZrB2-SiC) cera...
The grain boundary free energy of solids at elevated temperatures has been rarely reported because of the difficulty in determining it from the existing methods. In the present work, a theoretical model for the temperature-dependent grain boundary energy is proposed via an analytical approach from the energy view by relating its temperature depende...
Knowledge of the ideal shear strength of solid single crystals is of fundamental importance. However, it is very hard to determine this quantity at finite temperatures. In this work, a theoretical model for the temperature-dependent ideal shear strength of solid single crystals is established in the view of energy. To test the drawn model, the idea...
Chiral metastructures consisting of ring (polygonal or cubic) nodes and elastic bending ligaments exhibit excellent design flexibility for compliant structures. In this paper, based on rigid cubic node rotation and the kinematic geometrical relations of a three-dimensional (3D) isotropic anti-tetrachiral structure, an analytical expression for the...
Knowledge of the ideal shear strength of solid single crystals at finite temperatures is of fundamental importance. It is mainly determined by the molecular dynamics simulations. However, thus obtained results are strongly dependent on the employed empirical potentials. In the present work, two theoretical models for the temperature-dependent ideal...
The flexural properties of chemical vapor deposited (CVD) zinc sulfide (ZnS) above 600 °C are studied for the first time. The bending strength increases up to 600 °C and then decreases rapidly. The Young's modulus initially decreases, reaches the minimum value near 900 °C, and then increases as temperature increases. Recrystallization occurring abo...
The thermal shock resistance of chemical vapor deposited zinc sulfide (CVD ZnS) infrared side window of high-speed vehicles with convective cooling is studied using finite volume method. The involved factors are the surface heat flux, coolant temperature, convective heat transfer coefficient, and thermal shock initial temperature. All the material...
A semi-analytical method is used to investigate the dispersion and damping characteristics for rectangular thin orthotropic composite plates in mid frequency analysis. A symplectic eigenproblem is formed whose solution gives analytically the dispersion equation and the wave shape for any combination of simple boundary conditions along the plate edg...
Knowledge of the surface energy of ceramic single crystals at elevated temperatures is of fundamental importance. However, it is very hard to obtain this quantity from the existing experiments, simulations, and theories. In the present work, following the Orowan-Polanyi and Gilman models' principles, two theoretical models for the temperature-depen...
In this work, mechanical properties of a T800 carbon fiber/modified epoxy composite material were researched by using a dynamic mechanical analyzer (DMA) operated under flexural mode. The dynamic mechanical behavior was investigated by DMA at a fixed frequency of 1 Hz. Because mechanical properties of the material were influenced by both time and t...
An analytical wave propagation model is proposed in this paper for damping and steady state forced vibration of orthotropic composite plate structure by using the symplectic method. By solving an eigen-problem derived in the symplectic dual system of free bending vibration of orthotropic rectangular thin plates, the wave shape of plate is obtained...
A temperature-dependent theoretical model for the surface free energy of the solid single crystals is established. This model relates the surface free energy at the elevated temperatures to that at the reference temperature, the temperature-dependent specific heat at constant pressure and coefficient of the linear thermal expansion, the heat of pha...
The compressive strength is a key factor for the design, application, and evaluation of the chemical vapor deposited (CVD) zinc sulfide (ZnS) in infrared optical engineering. However, to date, only the values of the compressive strength at room temperature (RT) have been reported. In this paper, the compressive strength of CVD ZnS from RT to 600°C...
For traditional bulk ceramics, the compressive strength is much greater than the tensile strength. Thus, only the tensile failure is usually considered in the thermal shock resistance (TSR) of these ceramics. However, the compressive strength of chemical vapour deposited (CVD) zinc sulfide (ZnS) is relatively low. It thus becomes critical in evalua...
The thermal shock resistance (TSR) of ZnS wave-transparent ceramic depends on not only the mechanical and thermal properties of materials, but also the aerodynamic heating, pneumatic pressure, external constraint, size, aspect ratio and other factors in its actual service process. The theoretical model was established by introducing the analytical...
In thermal structural engineering, ceramic components can have various shapes and be constrained. It is traditionally known that the thermal shock resistance (TSR) of ceramic components (with conduction occurring in the thickness direction), such as disk, oval plate and rectangular plate, is independent of the in-plane geometric shapes. The present...
The effects of mechanical boundary conditions, often encountered in thermalstructural engineering, on the thermal shock resistance (TSR) of ultra-high temperature ceramics (UHTCs) are studied by investigating the TSR of a UHTC plate with various types of constraints under the first, second, and third type of thermal boundary conditions. The TSR of...
This paper is aimed to fill the void in the literature regarding the temperature-dependent ideal tensile strength of the AlB2-like diborides. To this end, two models of temperature-dependent ideal tensile strength of hexagonal single crystals are developed based on the critical failure energy density principle and the critical strain principle. The...
To reveal the fracture failure mechanisms of single crystals at elevated temperatures, a new temperature-dependent ideal tensile strength model for solids has been developed, based on the critical strain principle. At the same time, the uniaxial tensile strength model, based on the critical failure energy density principle for isotropic materials t...
In order to study the combined effect of aerodynamic heating, pneumatic pressure and external constraint on the thermal shock resistance (TSR) of ZnS wave-transparent ceramic in its actual service process, the theoretical model is established by introducing the analytical solution of transient heat conduction problem of ZnS plate under aerodynamic...
The transient temperature distribution of the ultrahigh-temperature ceramic (UHTC) thermal protection system (TPS) of hypersonic vehicles is calculated using finite volume method. Convective cooling enables a balance of heat increment and loss to be achieved. The temperature in the UHTC plate at the balance is approximately proportional to the surf...
Thermal shock resistance (TSR) of ultra-high temperature ceramic (UHTC) thermal protection system was investigated. The influences of the ratio of the UHTCs' compressive-tensile strength, surface heat flux, convective heat transfer coefficient, and coolant temperature are studied. The failure of the ultra-high-temperature ceramic (UHTC) plate under...
The thermal shock resistance (TSR) of the ultra-high temperature ceramic (UHTC) plate under convective environments is studied. The critical failure temperature difference has a danger temperature range about the thermal shock initial temperature. However, the critical failure dimensionless time decreases as the thermal shock initial temperature in...
The knowledge of the fracture strength of solids from room temperature to melting point is not only important for practical application but also useful for the understanding of the failure mechanisms of materials at elevated temperatures. In the present work, an apparatus for high-temperature mechanical testing has been developed and described in d...
A model of thermal stress field from literature with temperature-dependent thermophysical properties is updated using an appropriate expression of thermal strain due to free thermal expansion. The thermal shock resistance of the ultra-high-temperature ceramic plate under aerodynamic thermal environments is then studied by combining the proposed ana...
Through introducing the analytical solution of the transient heat conduction problem of the plate with convection into the thermal stress field model of the elastic plate, the stress reduction factor is presented explicitly in its dimensionless form. A new stress reduction factor is introduced for the purpose of comparison. The properties and appro...
A model of effective thermal conductivity is established by combining the previous model of effective thermal conductivity of gas–solid composite materials and approximately effective medium theory. Based on the previous model of single idealized contact, the thermal contact resistance between the particles is considered. The study shows that the e...
A temperature-damage-dependent thermal shock resistance model for ultra-high temperature ceramics is established. This model is based on the sensitivities of thermo-physical properties to temperature and the evolution of the control mechanisms of strength with the change of temperature of ultra-high temperature ceramics, and incorporates the effect...
Taking the hafnium diboride ceramic as an example, the effects of heating rate, cooling rate, thermal shock initial temperature, and external constraint on the thermal shock resistance (TSR) of ultra-high temperature ceramics (UHTCs) were studied through numerical simulation in this paper. The results show that the external constraint has an approx...