作者：
Deng Yulong;Ding Ke;Ouyang Chunsheng;Luo Yingshe;Tu Yu;...
期刊：
Results in Engineering,2023年17:100837 ISSN：2590-1230
通讯作者：
Ding Ke<&wdkj&>Ouyang Chunsheng
作者机构：
Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China;College of Civil Engineering, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China;[Tu Yu; Fu Jianyi; Wang Wei] Hunan Institute of Traffic Engineering, Hengyang, 421000, China;[Du Yaguang] Wuhan Municipal Engineering Design & Research Institute Co., Ltd., Wuhan, Hubei, 430015, China;[Deng Yulong; Ding Ke] Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China<&wdkj&>College of Civil Engineering, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China
通讯机构：
[Ding Ke; Ouyang Chunsheng] H;Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China<&wdkj&>College of Civil Engineering, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China<&wdkj&>Hunan Institute of Traffic Engineering, Hengyang, 421000, China<&wdkj&>Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China<&wdkj&>College of Civil Engineering, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China
摘要：
As a common structural form, thin plates are widely used in civil engineering. Since the thin plate needs to face harsh work conditions, the damage inevitably to be accumulated, thus affecting the stability and safety of the application components. Therefore, it is of great application significance to quantify and characterize the damage of thin plates. However, the raw images produced by current inspection techniques such as Ultrasonic immersion C-scan technology, Metal sheet Lamb wave inspection technology, etc applied to thin plates usually bring various noises and imperfections during the reception, encoding, and transmission. In this paper, wavelet transform and Curvelet transform are used to denoise the detected noise image. First, we outline the numerical implementation of two newly developed multi-scale representation systems. Curvelet transform is a new multi-scale transform based on wavelet transform after 1999. The purpose of this paper is to analyze the influence of wavelet and Curvelet transform on image denoising. These methods can also be applied to the problem of image restoration from noisy images, and the effects of denoising on images are compared. The results show that the Curvelet transform can accurately identify the damage location for the thin plate damage degree, damage range, strip damage, and multiple damage conditions, and its energy focusing is better than that of the wavelet transform in each type of thin plate damage.
期刊：
Surface and Coatings Technology,2019年372:56-64 ISSN：0257-8972
通讯作者：
Liu, Xiu-Bo
作者机构：
[Liang, Jue; Ke, Jin; Liu, Xiu-Bo; Luo, Ying-She] Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface Interface Sci & Te, Changsha 410004, Hunan, Peoples R China.;[Liang, Jue; Ke, Jin; Liu, Xiu-Bo; Luo, Ying-She] Cent South Univ Forestry & Technol, Hunan Prov Key Lab Engn Rheol, Changsha 410004, Hunan, Peoples R China.;[Liu, Xiu-Bo] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China.;[Liang, Liang] Changsha Univ, Coll Mech & Elect Engn, Changsha 410022, Hunan, Peoples R China.
通讯机构：
[Liu, Xiu-Bo] C;Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface Interface Sci & Te, Changsha 410004, Hunan, Peoples R China.
关键词：
High temperature protective composite coating;Laser processing;Oxidation mechanism;Titanium alloy
摘要：
Three kinds of composite coatings with different proportion of preplaced Ni-Mo-Si powders were fabricated on Ti6Al4V alloy by laser depositing to enhance the high temperature oxidation resistance. The microstructures of composite coatings were studied by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The microhardness of composite coatings was measured by Vickers microhardness tester. The samples of composite coatings and Ti6Al4V alloy underwent isothermal oxidation tests at 800 degrees C, and the oxidation mechanism was analyzed by thermodynamics and kinetics. Results indicate that composite coatings mainly include Ti5Si3, MoSi2 and Mo5Si3 as enhanced phases and alpha-Ti/NiTi as matrix, and have metallurgical bonding with substrate. With the increase of Ni content in composite coatings, the inter-metallic compounds alpha-Ti/NiTi matrix increased and the hard phase Ti5Si3 refined. The average microhardness of composite coatings is 2.6, 2.4, 2.3 times of that of Ti6Al4V alloy, respectively. Oxidation mass gain of the coatings are 5.6%, 12% and 57.9% of that of the substrate at 800 degrees C for 100 h, respectively, and oxide scales of the coatings are continuous and dense, showing good oxidation resistance at high temperatures.
通讯机构：
[Luo, Yingshe] C;Cent South Univ Forestry & Technol, Hunan Prov Key Lab Engn Rheol, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Civil Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Epoxy resin adhesive;Room temperature cured;Hydrothermal aging;Dynamic mechanical analysis
摘要：
To evaluate the performance and reliability of a new type of epoxy resin adhesive, the dynamic mechanical analysis (DMA) testing was performed at different levels of temperature and frequency after hydrothermal aging. The results of the DMA and the thermodynamic analysis that the performance of the adhesive has little change after hydrothermal aging for 30days meant that the resistance to hydrothermal aging of this adhesive was excellent. In addition, the time-temperature equivalence principle and time-aging time equivalence principle were proposed here to offer additional insights into the dynamic mechanical performance of the newly developed adhesive. Moreover, an effective method by which the generalized curve of definite aging time in certain conditions of definite temperature and humidity can be obtained was introduced.
摘要：
Fretting wear, as an unique form of material degradation, was researched relatively scarce compared with sliding wear in recent study, especially on influence of aging treatment on the fretting wear property of laser cladded composite coatings. In order to investigate the effect of aging treatment on microstructure and fretting wear of laser cladding self-lubricating anti-wear composite coatings on TA2 alloy, the composite coatings were prepared on TA2 alloy by laser cladding with precursor mixed WS2-TiC-Ti (mole ratio of 1:3:6) powders, and the fabricated coatings were heated at 300 degrees C, 500 degrees C and 700 degrees C in vacuum for 1 h, respectively. The microstructure, micro-hardness, fretting wear properties of as-laser cladded and heat-treated composite coatings were studied systematically. The results show that the composite coatings mainly contain three types of phases: the carbides (Ti,W)C1-x and TiC, alpha-Ti, sulfides TiS and Ti2SC. The micro-hardness of composite coatings after aging treatment is higher than the coating without aging treatment. The main wear mechanisms of composite coatings after aging treatment at 700 degrees C are abrasive wear and adhesive wear, and the composite coating exhibits good fretting wear property.
作者机构：
[刘秀波; 周仲炎; 罗迎社] Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha;410004, China;[Zhai, Yong-Jie; 乔世杰; 徐江宁] School of Mechanical and Electric Engineering, Soochow University, Suzhou;Jiangsu;215006, China
通讯机构：
[Liu, X.-B.] H;Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha, China
作者机构：
[周仲炎; 刘秀波; 罗迎社; 王勉] Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha, Hunan, 410004, China;[涂溶] State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, Hubei, 430070, China;[刘秀波; Zhai, Yongjie; 乔世杰] School of Mechanical and Electric Engineering, Soochow University, Suzhou, Jiangsu, 215006, China
通讯机构：
Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha, Hunan, China
作者机构：
[罗迎社; 刘秀波; 肖敏] Institute of Rheological Mechanics and Materials Engineering, Central South University of Forestry and Technology, Changsha, 410004, China;[刘秀波; 罗迎社] Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha, 410004, China;[司家勇] School of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
[Luo, Y.] I;Institute of Rheological Mechanics and Materials Engineering, Central South University of Forestry and Technology, Changsha, China
作者机构：
[周仲炎; 刘秀波; 罗迎社] Institute of Rheological Mechanics &, Materials Engineering, Central South University of Forestry &, Technology, Changsha, Hunan, 410004, China;[刘秀波; Zhai, Yongjie; 乔世杰] School of Mechanical and Electric Engineering, Soochow University, Suzhou, Jiangsu, 215006, China
通讯机构：
Institute of Rheological Mechanics & Materials Engineering, Central South University of Forestry & Technology, Changsha, Hunan, China
