He has done a lot of research on the interface engineering of composite materials, composite material reinforcement technology for large structures and optical fiber sensor monitoring technology, smart composite materials driven by shape memory alloys and the application of memory alloys in engineering. research and achieved fruitful results. To date, *** has published more than 120 papers in international journals, which have been cited more than 400 times, and more than 50 papers at international academic conferences.
(1) In the field of composite material interface engineering
He has made very important contributions in the field of composite material interface engineering. Based on the early Gao Mi (Gao Yuchen, Mi Yaorong) fiber pull-out model, a lot of systematic research work has been done, and the limited embedded fiber length, the binding of adjacent fibers, and the coating on the fiber surface have also been considered. and the influence of fiber surface roughness, etc. Taking into account the Poisson expansion effect of the fiber and the variable friction at the fiber-matrix interface debonding, this model has been widely extended to the case of fiber push-out (relevant to ceramic matrix composites), based on the Griffith fracture mechanics criterion, and Considering the statistical distribution of fiber defects and the transition between interface debonding and matrix fracture, the applicant further extended this theoretical model to single fiber fragmentation testing and fatigue expansion of the fiber matrix interface and its impact on the basic cracks of composite materials. Based on these research results, the applicant and his collaborators*** published nearly twenty papers in international academic journals included in SCI, which have been cited more than 230 times.
(2) Composite material reinforcement and optical fiber sensor monitoring technology used in large structures
A large number of systematic studies have been conducted on the use of composite materials to strengthen and repair large structures, and at the same time, they have successfully Optical fiber sensor technology is applied to monitor the changes in strain and force inside the reinforced and repaired structure and at the interface between the composite material and the structure. The study considered the effects of the number of fiber layers, temperature changes, matrix crack shapes, and bonding methods of composite materials on interface and temperature bond strength and fracture. Taking into account the small and fragile characteristics of optical fiber sensors, a variety of pre-embedded, concrete or plastic-wrapped optical fiber sensors have been designed and produced and successfully used in concrete structures. A lot of research has been done on optical fiber sensing technology based on the principle of white light interference. He has designed and manufactured a variety of sensors and applied them to landslide monitoring projects. Based on the above research results, he and his collaborators have published more than 40 academic papers in international journals.
(3) Application of memory alloys in engineering and smart composite materials
Shape memory alloy (SMA) is an important smart material and has been used in the field of medical devices. Wide range of applications. However, it is not widely adopted in other engineering fields. The applicant has done a lot of research work on the engineering of SMA, and has designed and manufactured a variety of SMA drives that can be used in a variety of products in daily life, including automatic control of fire escapes, silent drives of three-dimensional decorative products, and household products. Electrical appliances, toys, etc. And successfully obtained two US patents (US6,686,564; US6,390,878), a British patent (GB2357555) and a Chinese patent (CN200610092375.0). The applicant has done a lot of research in the field of SMA smart composite materials and established new optimized driving conditions by considering the interaction between SMA fiber and composite matrix, the limit of stress transfer, and the phase changes caused by stress and temperature, SMA-matrix Interface failure criterion and natural frequency control model of composite beams.
(4) Nanomaterials and technology
The applicant has expanded its research field to nanocomposite materials and technology in recent years, and recently successfully developed titanium dioxide nanotubes. Now it is Development of biosensors based on titanium nanotubes.