Qiang Yang

Qiang Yang
Harbin Institute of Technology | HIT · Center for Composite Materials and Structures (CCMS)

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40
Publications
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499
Citations

Publications

Publications (40)
Article
Carbon fiber-reinforced composites (CFRCs) exhibit the characteristic of coupling resistance and damage; therefore, electrical resistance tomography (ERT) can be used to image in situ damage. However, there is a lack of research on the development of forward calculation for CFRCs anisotropy in ERT. In this article, a resistor network (RN) is propos...
Article
The dynamic responses of key regions are critical inputs for the structural life estimation of spacecraft. Response reconstruction methods are needed for structural locations where sensors are not placed due to resource limitations. In this paper, a reconstruction method based on complete ensemble empirical mode decomposition with adaptive noise (C...
Article
Reusable spacecraft has great potential in reducing space launch cost. Structural reliability evaluation is critical for mission planning of reusable spacecraft. A dynamic reliability prognosis method based on digital twin framework is proposed for mission planning in the paper. In this method, Uncertainties integration and dynamic model updating a...
Article
Full-text available
Intelligent composite structures with self-aware functions are preferable for future aircrafts. The real-time location of damaged areas of composites is a key step. In this study, deep transfer learning was used to achieve the real-time location of damaged areas. The sensor network obtained acoustic emission signals from different damaged areas of...
Article
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...
Article
In this paper, dynamic Bayesian networks (DBNs) were employed to solve one-dimensional inverse heat transfer problems (IHTPs) with temperature history data. Temperature-dependent conductivities and surface heat flux histories were discretized into a finite number of parameters and used as parent nodes in the DBN. Parameter sensitivity analyses were...
Article
Charring ablators are widely used for the thermal protection structure (TPS) of return capsules. However, adopting only a single type of ablator limits the structural efficiency of the TPS due to the thermal protection and insulation requirement conflicts. Here, we report on different types of hybrid TPSs to improve the heat-shielding performance....
Article
Carbon/Carbon (C/C) composites are expected to serve as structural materials over 2800℃. Experiments under ultra-high temperatures (UHT) are critical and demanding. In this paper, we established the UHT compressive experiment technique using simultaneous Joule heating and compressive loading fixtures. The specimen was designed and validated to achi...
Article
Full-text available
In-plane elastic and interlaminar properties of composite laminates are commonly obtained through separate experiments. In this paper, a simultaneous identification method for both properties using a single experiment is proposed. The mechanical properties of laminates were treated as uncertainties and Bayesian inference was employed with measured...
Article
The electrical properties of C/SiC composites could be used for online and in-situ damage monitoring. To investigate alternating current (AC) impedance response to damage in the C/SiC composites, monotonic and incremental cyclic tensile tests were performed. Both AC impedance and acoustic emission (AE) techniques were applied to clarify the damage...
Article
Reusable spacecraft can significantly reduce the cost of space travel, while evaluation of the structural health of the craft between flights becomes one of the key issues. A digital twin framework is proposed in this paper to track the life of spacecraft structures. A digital twin is a digital representation of an engineering system. It can simula...
Article
The reliable characterization of uncertainties is critical for system evaluations and safety designs. However, insufficient samples are frequently encountered especially in composite materials. Four characterization methods for sparsely sampled quantities (SSQs) were discussed in the current study, including extreme value (EV) interval, tolerance i...
Article
Virtual tests for a single-fiber–reinforced composite model subjecting to transverse tension are carried out based on a phase-field method considering a varying interface toughness parameter. Without pre-treating the crack initiation location and propagation path, the complete fracture process is realized for the first time in a three-dimensional n...
Article
In this paper, the applicability of the conventional random balanced design method for the Fourier amplitude sensitivity test (RBD-FAST) is extended to uncertainty parameters with nonuniform distributions. The latter is a more general premise in real-world applications. The Halton low discrepancy sequence is proposed for direct random sampling (DRS...
Article
Material strength under complex stress states is vital for structure design. This paper studied the strength and failure behaviour of 3D C/C composites under compression-shear coupled loads. Experiments were conducted using a modified anti-symmetric four-point bending (MAFPB) method and off-axis compression method. Two dominant failure modes were o...
Article
C/SiC composites exhibit nonlinearity and dispersions in macroscopic constitutive behaviors, and both characteristics are dependent on external load. Previously, only uncertainties in elastic modulus have been considered, and this is not sufficient. In this paper, a characterization method for uncertainty in material behavior of a C/SiC composite i...
Article
The application of uncertainty quantification (UQ) in complex structural response analysis is limited by solution efficiency. A multi-fidelity (MF) method for UQ is proposed in this paper, in which statistical moments are first evaluated using low cost low-fidelity (LF) model first, and then calibrated with a small number of high-fidelity (HF) samp...
Article
Full-text available
A finite element-based phase field method for modeling the complex failure mechanism of a unidirectional fiber composite under transverse tensile loading was developed. An interface layer with a finite width was incorporated between a fiber and the matrix to implement interfacial failure. Different processes such as onset of interfacial cracking an...
Article
With both thermal insulation and load-bearing capabilities, integrated thermal protection systems (ITPS) can effectively improve structural efficiency, and thus are promising TPS concepts for future hypersonic vehicles. However, the connection structure of ITPS must adhere to the constraints of both low thermal conductivity and high mechanical perf...
Article
Due to damage coupling and anisotropic evolution, constitutive models of Ceramic Matrix Composites are generally deficient in the description of material behavior under complex load conditions. This paper studied the mechanical behavior of a PIP prepared 3k carbon fabric plain woven C/SiC material under complex stress states. The phenomenon and mec...
Article
Silicon nitride ceramics doped with four different composition of sintering additives were prepared by hot pressing (HP) sintering. The effect of CeO2 addition and Yb2O3 addition on the formation temperature of liquid phase, the densification, the microstructure and the mechanical properties of Si3N4 ceramics were investigated. The results show tha...
Article
The credibility of structural stress response predictions is critical in the design and analysis of increasingly used C/SiC structures. The complexities of the damage mechanisms pose a challenge to the accuracy of the predictions. In this paper, the bi-modulus characteristic of C/SiC, which is induced by the micro cracks opening and closing under t...
Article
This paper presented an innovative integrated Thermal Protection System (ITPS) with both thermal insulation and load bearing capabilities. Thermal short and thermal expansion mismatch effects are the key design challenges of an ITPS. The objective of this paper is to establish a topology optimization method against these two effects. The thermal-me...
Article
Molybdenum disilicide (Si3N4-MoSi2) was prepared by spark plasma sintering (SPS) of the Si3N4 and Mo powder mixture with 7 mol% CeO2 sintering additives. The sintering time and sintering temperature were optimized, and the effect of in-situ formed MoSi2 on the microstructure, phase transformation and thermal diffusivity of Si3N4 ceramic was investi...
Article
A coupling framework of hypersonic flow, heat transfer and structural response is presented in this paper in order to accurately predict aerodynamic environment, extreme aerothermal environment, as well as thermal and structural response for hypersonic flight. Multi-field coupling analysis is implemented in conjunction with the hypersonic chemical...
Article
Graphene nanoribbons (GNRs) were obtained by unzipping multiwall carbon nanotubes (MWCNTs). Three different silicon nitride-carbon nanostructures were prepared by spark plasma sintering (SPS): ceramic composites that contained 1 wt% carbon nanofibers (CNFs), 1 wt% MWCNTs and 1 wt% GNRs respectively. The α to β-Si3N4 transformation ratio and thermal...
Article
Integrated thermal protection systems with both thermal protection and load-bearing capabilities are regarded as one of the most promising thermal protection concepts for future hypersonic vehicles. Yet improper design could cause the structure to be overweight and even fail prematurely during service. In this paper, the thermal–mechanical analysis...
Article
Thermal protection material and structure is one of the key technologies enabling near space hypersonic flights. For the past few years, new design and analysis methods have constantly emerged. This paper will focus on these new concepts and technologies, and a survey of literature reveals that: design of thermal protection materials has been devel...
Article
Composites are multi-scale in nature. The multi-scale simulation stands among one of the most important methods for response analysis of composites, due to its ability to incorporate micro scale damage initiation, evolution and the corresponding effects in macro material property and mechanical behavior. The multi-scale asymptotic expansion theory...
Article
With the development of hypersonic vehicles, aerodynamic heat loads on thermal protection materials under high enthalpy disassociated environment is affected by surface catalytic properties to a large extent. According to the research development in characterization of high enthalpy environment and surface catalytic properties, this paper presents...
Article
Thermal-structural Integrated Thermal Protection System (ITPS) is more efficient than typical TPS because of its' load carrying capability. Recently, several ITPS concepts including thermally integrated corrugated core sandwich panel and its improved concept, rigid insulation bar ITPS, and hierarchical sandwich panel ITPS have been developed. In th...
Article
The demanding requirements of high-speed aircraft for structural efficiency lead to their thermal protection system to be lightweight and integrated. The new thermal-mechanical coupling integrated thermal protection system (ITPS) has great potential for development. Firstly, the concept and characteristics of a new integrated thermal protection str...
Article
The heating rate and size effect on thermal shock resistance of a ZrB2–SiC–graphite (ZSG) composite was studied by measuring the retention of the flexural strength after rapid resistance heating in a low oxygen partial pressure environment. The residual strength values for the specimen heated in a low oxygen partial pressure of 200 Pa decreased gra...
Article
In order to study the factors affecting thermal shock resistance of ultra-high temperature ceramic composite materials, a home-made multiparameter thermal shock testing device for conducting thermal protection materials was established to test the impact of factors, such as surface temperature response, the rate of temperature rising, dimensional e...

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