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American Society for Testing and Materials

A review of recent research on mechanics of multifunctional composite materials and structures

The paper provides a state of the art review of guided wave based structural health monitoring (SHM). First, the fundamental concepts of guided wave propagation and its implementation for SHM is explained. Following sections present the different modeling schemes adopted, developments in the area of transducers for generation, and sensing of wave, signal processing and imaging technique, statistical and machine learning schemes for feature extraction. Next, a section is presented on the recent advancements in nonlinear guided wave for SHM. This is followed by section on Rayleigh and SH waves. Next is a section on real-life implementation of guided wave for industrial problems. The paper, though briefly talks about the early development for completeness,. is primarily focussed on the recent progress made in the last decade. The paper ends by discussing and highlighting the future directions and open areas of research in guided wave based SHM.

https://iopscience.iop.org/article/10.1088/0964-1726/25/5/053001/pdf

Guided wave based structural health monitoring: A review

Electrospun nanofiber reinforced composites: a review

Data fusion and machine learning for industrial prognosis: Trends and perspectives towards Industry 4.0

Erratum to Monitoring of delamination onset and growth during Mode I and Mode II interlaminar fracture tests using guided waves [Compos Sci Technol 2011;72(2):145-51]

With the continuous development of China’s distribution system, large-scale interconnection of power grids has become an inevitable trend of development, and distribution network as an important part of the distribution system, its safe and reliable operation is an important guarantee of production and life. In recent years, power outage accidents and chain failures are frequent, which urges us to further explore the optimization of network characteristics of power system from a scientific point of view. In the actual operation process, the distribution network topology will change irregularly due to uncertain factors such as the change of contact relationship, equipment maintenance, and supply transfer in the case of failure. Therefore, scientific and effective identification of the distribution network topology is very important for the stable operation of the network. In this paper, a topology identification model construction method based on voltage correlation coefficient is proposed. According to the principle of electrical distance and voltage correlation of nodes, a physical-probability model of switching state and voltage correlation of distribution network nodes is formed as state variables.

Construction of distribution network topology identification model based on voltage correlation coefficient

Computational modelling of fracture constitutes an indispensable tool not only to predict the failure of cracked structures but also to shed insights into the mechanism of the fracture processes of many materials. This work presents the first application of a phase field fracture model to the modelling of multiple crack growth in brittle solids. Furthermore, a comparison with an XFEM based discrete fracture model is also given. Phase field fracture (PFF) models are the regularised versions of the variational approach to fractures which generalise the classic Griffith's fracture mechanics theory for brittle materials. PFF models can handle topologically complex fractures such as intersecting cracks, branching cracks in both two dimensions and three dimensions with a quite straightforward implementation.

Computational modelling of multiple crack growth: A comparison between discrete and phase field models

Stringer-stiffened plate-like structure is a typical engineering structure and its structural integrity is critical. A guided Lamb wave-based damage identification scheme and an online structural health monitoring (SHM) system with an integrated PZT-sensor network were developed. In the previous studies, the specimens were relatively simple. In this paper, the abovementioned method was extended to the stiffened plate-like structure—a flat plate reinforced by stringer. FE dynamic simulation was applied to investigate the Lamb wave propagation characteristics due to the existence of stringer with the consideration of its material and geometric configurations.

Propagation characteristics of lamb waves in stringer-stiffened panels

\n The electro-mechanical (EM) admittance signals acquired from piezoelectric transducers (PZT) surface bonded to the host structure are often used for structural health monitoring (SHM). However, it is well known that the method is susceptible to contamination from environmental and operational conditions. This paper introduces a co-integration method to remove dynamic load effects from electro-mechanical admittance data. The proposed method is based on the concept of co-integration that is partially built on the analysis of the non-stationary behavior of time series. Instead of directly using admittance signatures of PZT for damage detection, the analysis of the co-integrated residual obtained from the co-integration procedure of EM admittance responses and the resonant peaks frequency of the real part of admittance (conductance) are chosen as co-integrated variables. The experiments of aluminum beam bolt loosening identification, which is under dynamic stress, were carried out to verify the effectiveness of the proposed method. The results showed that the method can isolate damage-sensitive features from stress variations, so as to successfully detect the existence of damage.

Ye Lu

Papers

Erratum to Monitoring of delamination onset and growth during Mode I and Mode II interlaminar fracture tests using guided waves [Compos Sci Technol 2011;72(2):145-51]

Construction of distribution network topology identification model based on voltage correlation coefficient

Computational modelling of multiple crack growth: A comparison between discrete and phase field models

Propagation characteristics of lamb waves in stringer-stiffened panels

Co-Integration-Based Compensation Technique for Dynamic Load Effects on the Electro-mechanical Impedance Method