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| 1 | Evaluation of numerical ablation model for charring composites显示文摘Charring composites are widely used in the thermal protection system(TPS) to consume the intense aerodynamic heating during vehicle reentry. The ablation and thermal responses for the charring composites can be studied by using a numerical ablation model, in which the surface ablation and volume ablation could be taken into account. The coupling interactions among temperature, gas motion and interior pressure producing the pyrolysis gas could make the computation more complicated. A multi-physics model is developed to simulate the thermal response coupled with volume ablation and surface ablation. After studying four typical ablation cases, the model is validated, and then the heat transfer mechanisms in ablation are investigated. It is found that the viscous dissipation energy by the motion of pyrolysis gas can be neglected in the simulation. Also, the flow of pyrolysis gas plays an important role in the temperature response, especially under high heat flux condition. | LI Wei ZHANG Jun FANG GuoDong LI WeiJie LIANG Jun MENG SongHe | 2019 | Science China(Technological Sciences)2019，62，8： | 4 |
| 2 | Editorial: Special subject on the mechanical behavior of thermal protection materials and structures显示文摘The thermal protection materials and structures are widely used in hypersonic vehicles for the purpose of thermal insulation,and their mechanical behavior is one of the key issues in design and manufacture of hypersonic vehicles.It is our great pleasure to present the seven papers in this special subject of Theoretical&Applied Mechanics Letters(TAML)and introduce | Songhe Meng Huimin Xie | 2014 | Theoretical & Applied Mechanics Letters2014，4，2： | 2 |
| 3 | Valence electron structure and properties of the ZrO_2显示文摘To reveal the properties of ZrO2 at the atom and electron levels, the valence elec- tron structures of three ZrO2 phases were analyzed on the basis of the empirical electron theory of solids and molecules. The results showed that the hybridization levels of Zr and O atoms in the m-ZrO2 were the same as those in the t-ZrO2, while those in the c-ZrO2 rose markedly. The electron numbers and bond energies on the strongest covalent bonds in the m-ZrO2 phase were the greatest, the values were 0.901106 and 157.5933 kJ/mol, respectively. Those in the t-ZrO2 phase took second place, which were 0.722182 and 123.9304 kJ/mol, and those in the c-ZrO2 phase were the smallest, which were 0.469323 and 79.0289 kJ/mol. According to the product of the bond energy on the strongest covalent bond and equivalent bond number (this value reflected the crystal cohesive energy), the order from the greatness to smallness was the c-ZrO2> t-ZrO2 > m-ZrO2. This showed that the m-phase bonds were the tightest, their energy was the smallest, the crystal cohe- sive energy of the m-phase was the largest, and the m-phase existed most stably at room temperature. So it must need energy or higher temperature to take apart the stronger covalent bonds to form a new phase. | LI JinPing, MENG SongHe, HAN JieCai & ZHANG XingHong Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China | 2008 | Science China(Technological Sciences)2008，51，11： | 2 |
| 4 | Comparison of ablative and compressive mechanical behavior of several PICA-like ablative materials显示文摘It is significant to compare the ablative and compressive mechanical behavior of different PICA-like materials in the engineering applications.The plasma wind tunnel ablation tests with high-entropy air and CO2 atmospheres,and compressive experiments in the ambient and 150℃,were conducted for three kinds of PICA-like materials(CF/PR-Si,CBCF/PR-SiOC and NQF/PR-Si composites).The traditional carbon/phenolic(C/PR)braided composites were also used for comparison.PICA-like materials have the better thermal insulation than traditional C/PR composite,especially for CBCF/PR-SiOC composite.The ablation behavior of CF/PR-Si and CBCF/PR-SiOC PICA-like materials in the CO2 atmosphere can produce a large amount of SiO2 in the form of coatings,oxide layers and skeletons on the ablated surface,which are greatly different from that in the air atmosphere.The compressive behavior of PICA-like material is greatly depended on the fiber fabrics,and exhibits the large discrete characteristics.The longer fiber in the PICA-like materials plays the role in maintaining the material integrity,while it may increase the thermal conductivity. | ZHANG Jun FANG GuoDong YANG LingWei LI Wei HONG ChangQing MENG SongHe | 2020 | Science China(Technological Sciences)2020，63，8： | 2 |
| 5 | Prediction on Carbon/Carbon Composites Ablative Performance by Artificial Neutral Net显示文摘A preliminary estimation of ablation property for carbon-carbon composites by artificial neutral net (ANN) method was presented.It was found that the carbon-carbon composites' density,degree of graphitization and the sort of matrix are the key controlling factors for its ablative performance.Then,a brief fuzzy mathe- matical relationship was established between these factors and ablative performance.Through experiments, the performance of the ANN was evaluated,which was used in the ablative performance prediction of C/C composites.When the training set,the structure and the training parameter of the net change,the best match ratio of these parameters was achieved.Based on the match ratio,this paper forecasts and evalu- ates the carbon-carbon ablation performance.Through experiences,the ablative performance prediction of carbon-carbon using ANN can achieve the line ablation rate,which satisfies the need of precision of practical engineering fields. | Guanghui BAI Songhe MENG Boming ZHANG Yang LIU | 2008 | Journal of Materials Science & Technology2008，24，6： | 1 |
| 6 | Mechanisms of thermal shock failure for ultra-high temperature ceramic显示文摘 | MENG Songhe LIU Guoqian GUO Yue | 2009 | Materials and Design2009，30，6： | 1 |
| 7 | Correlations between substrate bias, microstruc- ture and surface morphology of tetrahedral amor- phous carbon films显示文摘 | ZHU Jiaqi HAN Jiecai MENG Songhe | 2004 | Vacuum2004，72，： | 1 |
| 8 | Effect of Shouldering Angle on Distribution of Thermal Stress in Sapphire Single Crystal Growth Using Improved Kyropoulos显示文摘A two-dimensional model was established in the rectangular co-ordinate to study the thermal stress in the sapphire single crystal grown by the improved Kyropoulos. In the simulation, the distribution, the maximum and minimum values of the thermal stress were calculated. In addition, the relationship between the thermal stress and the shouldering angles was obtained that for lower shouldering angles, the maximum of the thermal stress value is lower and the minimum value is higher. It indicates that the distribution of the thermal stress can be improved by decreasing the shouldering angles of the crystal during the growth process. To evaluate the model, the experiment was carried out and the results are in good agreement with the calculation. | Yao Tai Han Jiecai Zuo Hongbo Meng Songhe Zhang Mingfu | 2006 | Journal of Rare Earths2006，24，z1： | 1 |
| 9 | Microstructure of a Mo-Si-C-N multi-layered anti-oxidation coating on carbon/carbon composites by fused slurry显示文摘A Mo-Si-C-N multi-layered anti-oxidation coating was in-situ fabricated by introducing nitrogen atmosphere during the fused sintering of Mo-Si slurry pre-layer on carbon/carbon composites. The phase composition and microstructure of the Mo-Si-C-N coating were characterized by X-ray diffractometry, optical microscopy, scanning electron microscopy with energy dispersive spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. The Mo-Si-C-N coating exhibited a three-layered structure. Besides the MoSi2/Si main-layer and the SiC bonding-layer, a surface layer of about 10 μm in thickness was synthesized on the coating surface. The surface layer mainly consisted of SiC nanowires and contained some Si3N4 and Si phases. SiC nanowires of 10 to 200 nm in diameter presented a terrace and distortion structure. Transmission electron microscopy indicated that the SiC nanowires grew along the preferred <111> direction. During oxidation test, SiC nanowires transmuted into SiO2 glass, which can play an important role in improving the oxidation resistance of C/C composites. | LAI Zhonghong MENG Songhe ZHU Jingchuan JEON Jaeho | 2009 | Rare Metals2009，28，5： | 1 |
| 10 | Correlations be- tween substrate bias, microstructure and surface morphology of tetrahedral amorphous carbon films 显示文摘 | Zhu Jiaqi Hart Jiecai Meng Songhe | 2004 | Vaccum2004，72，3： | 1 |
| 11 | Correlations between substrate bias,microstructure and surface morphology of tetrahedral amorphous carbon films显示文摘 | Zhu Jiaqi Han Jiecai Meng Songhe | 2004 | vacuum2004，72，： | 1 |
| 12 | Thermal shock resistance of a ZrB 2 –SiC–graphite composite in low oxygen partial pressure environment显示文摘 | Jin Hua Meng Songhe Yang Qiang Zhu Yanwei | 2013 | Ceramics International2013，，： | 1 |
| 13 | Mechanism analysis of thermal shock properties for ZrB 2 -20%SiCp-10%AlN ultra-high temperature ceramic with the surface defects显示文摘 | Songhe Meng Hua Jin Jing An Guanghui Bai Weihua Xie | 2010 | Solid State Sciences2010，，9： | 1 |
| 14 | Fabrication of electrical semi-conductive SiCN ceramics by vat photopolymerization显示文摘The emergence of additive manufacturing(AM)enables ceramics to be fabricated with customized geometry,and polymer-derived ceramics(PDCs)has attracted growing attention owing to their irreplaceable advantages.The combination of 3D printing and PDCs endows the resultant ceramics with both precision and performance.However,AM of ceramics from preceramic polymers is still challenging,and insufficient investigation of functionality also limits the versatility of precursor and its derived ceramics.Herein,we propose a novel paradigm for 3D printing dense silicon carbonitride ceramic and study its electrical semiconducting properties.The formulated photosensitive precursor inks could achieve self-polymerization and cross-linking under the radiation of UV light(405 nm).The green body with intricate structures is fabricated by digital light processing(DLP).Lightweight(1.79-2.08 g cm^(-3))and low porosity(<5%)amorphous ceramics were obtained after thermal treatments.Processes of cross-linking,decomposition,and ceramization are monitored and analyzed.Furthermore,the semi-conducting behaviors of resultant ceramics are identified where the conductivity(10^(-5)-10^(-1)S m^(-1))has a monotonic correspondence with the testing temperatures(25-1000℃).The numerical relationship is fitted by exponential functions,and its conducting mechanism could be interpreted by the band tail hopping(BTH)model.This work could provide alternative solutions for the fabrication of PDCs and potentials for sensing applications. | Siyao Chen Xue Wan Jinping Li Bo Gao Xuliang Chen Songhe Meng Jian Lu | 2023 | Journal of Materials Science & Technology2023，，34： | 0 |
| 15 | Effect of Substrate Bias on Microstructure and Properties of Tetrahedral Amorphous Carbon Films显示文摘The microstructure and properties of tetrahedral amorphous carbon (ta-C) films deposited by the filtered cathodic vacuum arc technology has been investigated by visible Raman spectroscopy, AFM and Nano-indentor. The Raman spectra have been fitted with a single skewed Lorentzian lineshape described by BWF function defining coupling coefficient, which characterizes the degree of asymmetry and is correlated with the sp3 content. When the substrate bias is -80 V, the sp3 content is the most and simultaneously the coupling coefficient is the least, following with the minimum root mean square surface roughness (Rq=0.23 nm) and the highest hardness (51.49 GPa), Young′s modulus (512.39 GPa), and critical scratching load (11.72 mN). As the substrate bias is increased or decreased, the sp3 content and other properties lower correspondingly. | Jiaqi ZHU Jiecai HAN Songhe MENG Qiang LI Manlin TAN | 2003 | Journal of Materials Science & Technology2003，19，z1： | 0 |
| 16 | Valence electron structure and properties of stabilized ZrO_2显示文摘To reveal the properties of stabilizers in ZrO2 on nanoscopic levels, the valence electron structures of four stable ZrO2 phases and c-ZrO2 were analyzed on the basis of the empirical electron theory of solids and molecules. The results showed that the hybridization levels of Zr atoms in c-ZrO2 doped with Ca and Mg dropped from B17 to B13, the hybridization levels of Zr atoms in c-ZrO2 doped with Y and Ce dropped from B17 to B15, and that the four stabilizing atoms all made the hybridization levels of O atoms drop from level 4 to level 2. The numbers of covalent electrons in the strongest covalent bond in the descending order are c-ZrO2>Zr0.82Ce0.18O2> Zr0.82Y0.18O1.91>Zr0.82Mg0.18O1.82>Zr0.82Ca0.18O1.82. The bond energies of the strongest covalent bond and the melting points of the solid solutions in the descending order are Zr0.82Ce0.18O2> c-ZrO2>Zr0.82Y0.18O1.91>Zr0.82Mg0.18O1.82>Zr0.82Ca0.18O1.82. The percent-ages of the total number of covalent electrons in the descending order are c-ZrO2>Zr0.82Y0.18O1.91> Zr0.82Ce0.18O2>Zr0.82Mg0.18O1.82> Zr0.82Ca0.18O1.82. From the above analysis, it can be concluded that the stabilizing degrees of the four stabilizers in the descending order are CaO> MgO>Y2O3>CeO2. | LI JinPing, HAN JieCai, MENG SongHe & ZHANG XingHong Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China | 2008 | Science China(Technological Sciences)2008，51，7： | 0 |
| 17 | Preface显示文摘Materials chemomechanics is an exciting and fast growing field where mechanics meets chemistry, and has drawn increasing attention in recent years. It is concerned with the phenomena and mechanisms of coupled chemical and mechanical interactions. Chemomechanical coupling phenomena exist in many research areas, ranging from the development of advanced batteries, biomechanical engineering, hydrogen embrittlement, and high temperature oxidation. In fact, a typical chemomechanical problem usually involves the processes of diffusion, chemical reaction, deformation and stress generation. Such a strong coupling between chemistry and mechanics can give rise to the complex spatial-temporal evolution of composition, microstructure and morphology in materials. | SHEN ShengPing ZHU Ting MENG SongHe FENG Xue | 2019 | Science China(Technological Sciences)2019，62，8： | 0 |
| 18 | An experimental study of ultra-high temperature ceramics under tension subject to an environment with elevated temperature,mechanical stress and oxygen显示文摘Ultra-high temperature ceramic(UHTC) composites are widely used in high-temperature environments in aerospace applications. They experience extremely complex environmental conditions during service, including thermal, mechanical and chemical loading. Therefore, it is critical to evaluate the mechanical properties of UHTCs subject to an environment with elevated temperature, mechanical stress and oxygen. In this paper, an experimental investigation of the uniaxial tensile properties of a ZrB_2-SiC-graphite subject to an environment with a simultaneously elevated temperature, mechanical stress and oxygen is conducted based on a high-temperature mechanical testing system. To improve efficiency, an orthogonal experimental design is used. It is suggested that the temperature has the most important effect on the properties, and the oxidation time and stress have an almost equal effect. Finally, the fracture morphology is characterized using scanning electron microscopy(SEM), and the mechanism is investigated. It was concluded that the main fracture mode involved graphite flakes pulling out of the matrix and crystalline fracture, which indicates the presence of a weak interface in the composites. | HAN XinXing XU ChengHai JIN Hua XIE WeiHua MENG SongHe | 2019 | Science China(Technological Sciences)2019，62，8： | 0 |
| 19 | Valence electron structure of the(ZrTi)B_2 solid solutions calculated by the three models显示文摘The Zr-rich(Zr0.8Ti0.2)B2 and the Ti-rich(Ti0.8Zr0.2)B2 solid solutions are formed when TiB2 and ZrB2 are hot-pressed.To forecast the properties of the two solid solutions,their valence electron structure was analyzed based on the empirical electron theory(EET) of solids and molecules.We used three different models,the average atom model,the average cell model and the real cell model,and compared with the calculation results from the three models.In the real cell model,the lattice constants of the solid solu-tions were supposed to be changed or unchanged.The results showed that different models could only result in slight change in the hybridization levels of the metal atoms in the two solid solutions and little difference between the calculation values.However,they can not change the variant trend of the va-lence electron structure nor the properties of the solid solutions.Thus,the three models and the methods are appropriate and the calculation results are reasonable and consistent. | LI JinPing,HAN JieCai,MENG SongHe & WANG BaoLin Center for Composite Materials,Harbin Institute of Technology,Harbin150001,China | 2009 | Science China(Technological Sciences)2009，52，5： | 0 |
| 20 | A reconfigurable dynamic Bayesian network for digital twin modeling of structures with multiple damage modes显示文摘Dynamic Bayesian networks(DBNs)are commonly employed for structural digital twin modeling.At present,most researches only consider single damage mode tracking.It is not sufficient for a reusable spacecraft as various damage modes may occur during its service life.A reconfigurable DBN method is proposed in this paper.The structure of the DBN can be updated dynamically to describe the interactions between different damages.Two common damages(fatigue and bolt loosening)for a spacecraft structure are considered in a numerical example.The results show that the reconfigurable DBN can accurately predict the acceleration phenomenon of crack growth caused by bolt loosening while the DBN with time-invariant structure cannot,even with enough updates.The definition of interaction coefficients makes the reconfigurable DBN easy to track multiple damages and be extended to more complex problems.The method also has a good physical interpretability as the reconfiguration of DBN corresponds to a specific mechanism.Satisfactory predictions do not require precise knowledge of reconfiguration conditions,making the method more practical. | Yumei Ye Qiang Yang Jingang Zhang Songhe Meng Jun Wang Xia Tang | 2023 | Theoretical & Applied Mechanics Letters2023，13，4： | 0 |
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