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学者姓名：赖福强
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Abstract ：
This study presents a new surface strengthening technique (cold upsetting manufacturing process) for engine valve seating face (VSF). The properties of the Ni30 superalloy VSF were characterized before and after cold upsetting. Compared to the solution-aging treatment (SAT) valve, the solution-cold upsetting-aging treatment (SCUAT) valve hardness was increased by 60 HV0.2. SCUAT valves exhibited higher internal dislocation degrees and local misorientation than SAT valves. Bench-top wear tests at 650 degrees C and 750 degrees C were conducted. The valve wear loss at 650 degrees C was higher than that at 750 degrees C. SCUAT valves show better wear resistance, with a total wear loss reduction up to 26.76 %. The SCUAT valve-seat insert contact pair wear mechanisms are adhesive and fatigue wear.
Keyword ：
Internal combustion engine exhaust valve Internal combustion engine exhaust valve Plastic deformation processing Plastic deformation processing Valve seating face Valve seating face Wear mechanisms Wear mechanisms
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| GB/T 7714 | Lai, Fuqiang , Cao, Changsheng , Shi, Chuangwei et al. Improvement of wear resistance for engine valve: Introducing cold upsetting treatment on valve seating face [J]. | WEAR , 2025 , 564-565 . |
| MLA | Lai, Fuqiang et al. "Improvement of wear resistance for engine valve: Introducing cold upsetting treatment on valve seating face" . | WEAR 564-565 (2025) . |
| APA | Lai, Fuqiang , Cao, Changsheng , Shi, Chuangwei , Sun, Ge , Qu, Rong , Mo, Dongqiang et al. Improvement of wear resistance for engine valve: Introducing cold upsetting treatment on valve seating face . | WEAR , 2025 , 564-565 . |
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This study addresses the enhancement of thermal stability of zinc alloys, which commonly experience reduced mechanical performance beyond 100 degrees C. The 304 stainless steel wires (SSWs) were utilized to fabricate a 3D porous metal rubber (MR) skeleton, facilitating the infusion of molten zinc alloys (ZA8) via squeeze casting to prepare MR/ZA8 composites. The impact of varying SSW volume fractions on the static compression creep (SCC) behavior of the MR/ZA8 composites at 250 degrees C was investigated, while exploring their SCC failure mechanisms. Energy dispersive spectrometer was used to analyze the MR/ZA8 composites both before and after the creep experiments. Findings revealed that in comparison to ZA8, MR/ZA8 composites exhibited notably lower SCC strain, diminishing with the increased SSW volume fraction. Under the applied stresses of 12 MPa, 17 MPa and 20.4 MPa, the steady-state SCC rate of MR/ZA8 composites experienced a reduction of 1 order of magnitude compared to ZA8. The apparent stress exponent n value ranged from 3.37 to 4.84, indicating a SCC mechanism dominated by dislocation climb within the two materials. The elemental composition of the MR/ZA8 composites remained largely unchanged, and the MR skeleton in the MR/ZA8 did not undergo oxidation.
Keyword ：
Failure mechanism Failure mechanism Metal rubber skeleton Metal rubber skeleton Squeeze casting Squeeze casting Static compression creep behavior Static compression creep behavior Zinc alloy matrix composite Zinc alloy matrix composite
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| GB/T 7714 | Lai, Fuqiang , Zhou, Ziang , Hu, Anqiong et al. Static compression creep behavior of MR/ZA8 composite at elevated temperature [J]. | MATERIALS TODAY COMMUNICATIONS , 2025 , 42 . |
| MLA | Lai, Fuqiang et al. "Static compression creep behavior of MR/ZA8 composite at elevated temperature" . | MATERIALS TODAY COMMUNICATIONS 42 (2025) . |
| APA | Lai, Fuqiang , Zhou, Ziang , Hu, Anqiong , Gao, Guilin , Wu, Yiwan , Zhang, Guosen et al. Static compression creep behavior of MR/ZA8 composite at elevated temperature . | MATERIALS TODAY COMMUNICATIONS , 2025 , 42 . |
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Textured surfaces have been widely applied in the field of engineering for friction reduction, but research on the effects of different texture design parameters on the wear and fatigue resistance of bearing steel remains insufficiently explored. In order to improve the anti-wear and anti-fatigue performance and prolong the service life of bearing steel, surface texturing technology was applied to fabricate textured GCr15 bearing steel materials. In this work, micro-groove surface texture was designed by hydrodynamic theory, then, it was fabricated on the GCr15 bearing steel surface using nanosecond laser processing. The depths (15 mu m, 30 mu m), spacing (100 mu m, 200 mu m, 300 mu m), and friction angles (30 degrees, 60 degrees, 90 degrees) of micro groove were selected as the primary parameters for micro groove fabrication. The friction and wear tests and rolling contact fatigue (RCF) tests were conducted to investigate the lubrication tribological properties. The results indicated that micro-groove spacing of 300 mu m significantly reduces the coefficient of friction (CoF), depth of 30 mu m produces a higher hydrodynamic pressure, and friction angle of 60 degrees has a lower CoF value. Compared to the untextured samples, the RCF life of micro-groove surface texture sample is improved, and the median RCF life is increased by 36.5%. And it could be attributed to the dispersion effect of micro-groove surface texture on stress concentration. The findings indicate that a well-designed micro-groove structure can enhance the fluid dynamic pressure lubrication effect to a certain degree. In comparison to smooth surface specimens, those with micro-grooves exhibit reduced friction.
Keyword ：
anti-friction mechanism anti-friction mechanism hydrodynamic lubrication effect hydrodynamic lubrication effect lubrication tribological properties lubrication tribological properties Micro-groove surface texture Micro-groove surface texture rolling contact fatigue rolling contact fatigue
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| GB/T 7714 | Lai, Fuqiang , Cao, Changsheng , Chen, Huanghuang et al. Influence of micro-groove surface texture on the lubrication tribological properties of GCr15 bearing steel [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY , 2025 . |
| MLA | Lai, Fuqiang et al. "Influence of micro-groove surface texture on the lubrication tribological properties of GCr15 bearing steel" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY (2025) . |
| APA | Lai, Fuqiang , Cao, Changsheng , Chen, Huanghuang , Lin, Chang , Song, Chenfei , Lei, Kangjie et al. Influence of micro-groove surface texture on the lubrication tribological properties of GCr15 bearing steel . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY , 2025 . |
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Passive vibration isolation techniques with low-frequency characteristics have been a hot topic in the aerospace field. A hydraulic inertial vibration isolator is a highly effective type of isolator for controlling low-frequency vibrations. It typically consists of a main spring, a minor spring, an inertial mass, and a fluid domain. Due to its multi-domain nature, analyzing the isolation mechanism of this type of isolator is challenging. The bond graph method is employed to establish the dynamic model of the isolator. Subsequently, the state equations of the isolator are derived, and the energy equations of both the mechanical and the fluid parts of the isolator are obtained. Based on this, the energy transfer characteristics between the mechanical and fluid domains inside the isolator under external excitation are discussed. The time-domain response of the forces transmitted to the foundation is analyzed. It is shown that the anti-resonance frequency occurs when the forces transmitted to the foundation generated by the main spring and the fluid pressure are equal to that of the minor spring. To verify the proposed method’s correctness, a prototype of the isolator is designed and a carefully designed experiment is conducted. The acceleration transmissibility of the isolator is used to conduct a comparative study. The results show that the theoretical results are in good agreement with the experimental results. To depict the dynamic characteristics of the isolator under large amplitude vibration, the nonlinear dynamic model of the isolator is developed, and the corresponding force transmissibility of the isolator is formulated. The energy flow between the mechanical and the fluid domains under this condition is also analyzed. The results indicate that the energy flow responses exhibit a similar change tendency to the force transmissibility. However, the peak of the energy ratio between the mechanical subsystem and the fluid is the same as the linear condition, suggesting that this value is determined by the amplification ratio of the isolator. This research provides enhanced physical insight to understand the dynamic characteristics of this type of isolator and will help to shorten the design cycle of the isolator. © 2024 by the authors.
Keyword ：
acceleration transmissibility acceleration transmissibility bond graph bond graph energy transfer energy transfer hydraulic inertial isolator hydraulic inertial isolator multi-energy-domain multi-energy-domain
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| GB/T 7714 | Liu, N. , Li, C. , Zhang, L. et al. The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects [J]. | Aerospace , 2024 , 11 (8) . |
| MLA | Liu, N. et al. "The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects" . | Aerospace 11 . 8 (2024) . |
| APA | Liu, N. , Li, C. , Zhang, L. , Lei, Z. , Yang, J. , Lai, F. . The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects . | Aerospace , 2024 , 11 (8) . |
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Debonding at the wire/matrix interface is a critical failure mode for spiral skeleton-polyurethane composites. In this work, the interfacial damage characteristics were determined using a finite element model based on the cohesive contact approach. The cohesive surface quadratic stress criterion (CSQUADSCRT) and cohesive surface damage (CSDMG) were used to characterize the damage state of the interface. The results indicate that the stress shifts along the loaded direction during interface damage. As the matrix thickness and embedded depth increased, the pull-out load increased, whereas the failure displacement decreased. Using the base contact mode results in a significantly smaller damage displacement compared to the case without base contact. When the strain of the spiral wire composite is 0.4, no damage occurs at the composite interface. The stress and interface secondary tension damage factor of the spiral wire surface fluctuate, with damage at the loaded end face being significantly higher than at the vertically loaded end face. © 2024 Elsevier Ltd
Keyword ：
Adhesion Adhesion Composite materials Composite materials Interface damage Interface damage Mechanical properties Mechanical properties Spiral skeleton Spiral skeleton
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| GB/T 7714 | Xue, X. , Ye, Z. , Lai, F. . Interfacial damage analysis of spiral skeleton-polyurethane composites based on a cohesive contact approach [J]. | Materials Today Communications , 2024 , 41 . |
| MLA | Xue, X. et al. "Interfacial damage analysis of spiral skeleton-polyurethane composites based on a cohesive contact approach" . | Materials Today Communications 41 (2024) . |
| APA | Xue, X. , Ye, Z. , Lai, F. . Interfacial damage analysis of spiral skeleton-polyurethane composites based on a cohesive contact approach . | Materials Today Communications , 2024 , 41 . |
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As a nickel-based alloy, GH4169 has the properties of excellent corrosion resistance, high temperature oxidation resistance and high creep resistance. In this paper, the compression creep behaviors of cylinder entangled wire materials (CEWMs) made from metal wires (GH4169 nickel-based alloy, 304 stainless steel) were investigated at elevated temperatures (from 400 °C to 500 °C). The performance degradation of the two materials was evaluated by the variation amplitude of four mechanical properties parameters and material characterization methods. The results indicated that both of 304 CEWMs and GH4169 CEWMs suffered a significant performance degradation at elevated temperatures, and both of the two CEWMs showed a much serious performance degradation above 450 °C (tempering temperature). Compared to the 304 CEWMs at the tested temperatures, the GH4169 CEWMs obtained better creep resistance. It is therefore concluded that the GH4169 CEWM is an excellent material that can replace the commonly used 304 CEWM at elevated temperature work conditions. © 2024 Elsevier B.V.
Keyword ：
Creep Creep Cylinder entangled wire material Cylinder entangled wire material Nickel-based alloy wire Nickel-based alloy wire Performance degradation evaluation Performance degradation evaluation Porous materials Porous materials
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| GB/T 7714 | Lai, F. , Gao, G. , Zhou, C. et al. Compression creep behaviors of GH4169 cylinder entangled wire material at elevated temperatures [J]. | Materials Letters , 2024 , 371 . |
| MLA | Lai, F. et al. "Compression creep behaviors of GH4169 cylinder entangled wire material at elevated temperatures" . | Materials Letters 371 (2024) . |
| APA | Lai, F. , Gao, G. , Zhou, C. , Wu, Y. , Xue, X. . Compression creep behaviors of GH4169 cylinder entangled wire material at elevated temperatures . | Materials Letters , 2024 , 371 . |
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Abstract ：
As a nickel -based alloy, GH4169 has the properties of excellent corrosion resistance, high temperature oxidation resistance and high creep resistance. In this paper, the compression creep behaviors of cylinder entangled wire materials (CEWMs) made from metal wires (GH4169 nickel -based alloy, 304 stainless steel) were investigated at elevated temperatures (from 400 degrees C to 500 degrees C). The performance degradation of the two materials was evaluated by the variation amplitude of four mechanical properties parameters and material characterization methods. The results indicated that both of 304 CEWMs and GH4169 CEWMs suffered a significant performance degradation at elevated temperatures, and both of the two CEWMs showed a much serious performance degradation above 450 degrees C (tempering temperature). Compared to the 304 CEWMs at the tested temperatures, the GH4169 CEWMs obtained better creep resistance. It is therefore concluded that the GH4169 CEWM is an excellent material that can replace the commonly used 304 CEWM at elevated temperature work conditions.
Keyword ：
Creep Creep Cylinder entangled wire material Cylinder entangled wire material Nickel -based alloy wire Nickel -based alloy wire Performance degradation evaluation Performance degradation evaluation Porous materials Porous materials
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| GB/T 7714 | Lai, Fuqiang , Gao, Guilin , Zhou, Congjian et al. Compression creep behaviors of GH4169 cylinder entangled wire material at elevated temperatures [J]. | MATERIALS LETTERS , 2024 , 371 . |
| MLA | Lai, Fuqiang et al. "Compression creep behaviors of GH4169 cylinder entangled wire material at elevated temperatures" . | MATERIALS LETTERS 371 (2024) . |
| APA | Lai, Fuqiang , Gao, Guilin , Zhou, Congjian , Wu, Yiwan , Xue, Xin . Compression creep behaviors of GH4169 cylinder entangled wire material at elevated temperatures . | MATERIALS LETTERS , 2024 , 371 . |
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Under severe work conditions, mechanical parts made of beryllium-copper alloy may undergo fatigue failure, which seriously affects the overall service life of the equipment. Therefore, improving the fatigue resistance of such kind of alloys is of great significance for their engineering application. In this research, C17200 beryllium-copper alloy was surface strengthened by means of a self-designed surface mechanical rolling treatment (SMRT) device. The fatigue behavior before and after SMRT was investigated using a ball-on-rod rolling contact fatigue (RCF) machine, and surface failure mechanisms were analyzed. It was found that the RCF resistance of the untreated C17200 alloy was weakened with the increase in the maximum Hertzian contact stress (sigma max). After surface treatment, C17200 alloy exhibited superior RCF resistance subjected to SMRT with a static rolling force of 200 N. But among the specimens treated by SMRT, the RCF resistance of beryllium-copper alloys was weakened with the increase in the SMRT static rolling force. The RCF life of specimens treated by SMRT with a force of 400 N is similar to that of untreated specimens, while the RCF lives of specimens treated by SMRT with a force of 735 and 980 N are even lower than that of untreated specimens. Thus, applying the appropriate static rolling force during SMRT can improve the surface quality and compressive residual stress, as well as enhance the fatigue resistance of C17200 alloys.
Keyword ：
beryllium-copper alloy beryllium-copper alloy crack propagation crack propagation fatigue resistance evaluation fatigue resistance evaluation rolling contact fatigue behavior rolling contact fatigue behavior surface mechanical rolling treatment surface mechanical rolling treatment
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| GB/T 7714 | Lai, Fuqiang , Cao, Changsheng , Mao, Kun et al. Rolling Contact Fatigue Behaviors of C17200 Beryllium-Copper Alloy Processed by Surface Mechanical Rolling Treatment [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2024 . |
| MLA | Lai, Fuqiang et al. "Rolling Contact Fatigue Behaviors of C17200 Beryllium-Copper Alloy Processed by Surface Mechanical Rolling Treatment" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2024) . |
| APA | Lai, Fuqiang , Cao, Changsheng , Mao, Kun , Hu, Anqiong , Li, Xiaopeng , Fu, Lihua et al. Rolling Contact Fatigue Behaviors of C17200 Beryllium-Copper Alloy Processed by Surface Mechanical Rolling Treatment . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2024 . |
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Abstract ：
Debonding at the wire/matrix interface is a critical failure mode for spiral skeleton-polyurethane composites. In this work, the interfacial damage characteristics were determined using a finite element model based on the cohesive contact approach. The cohesive surface quadratic stress criterion (CSQUADSCRT) and cohesive surface damage (CSDMG) were used to characterize the damage state of the interface. The results indicate that the stress shifts along the loaded direction during interface damage. As the matrix thickness and embedded depth increased, the pull-out load increased, whereas the failure displacement decreased. Using the base contact mode results in a significantly smaller damage displacement compared to the case without base contact. When the strain of the spiral wire composite is 0.4, no damage occurs at the composite interface. The stress and interface secondary tension damage factor of the spiral wire surface fluctuate, with damage at the loaded end face being significantly higher than at the vertically loaded end face.
Keyword ：
Adhesion Adhesion Composite materials Composite materials Interface damage Interface damage Mechanical properties Mechanical properties Spiral skeleton Spiral skeleton
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| GB/T 7714 | Xue, Xin , Ye, Zixiong , Lai, Fuqiang . Interfacial damage analysis of spiral skeleton-polyurethane composites based on a cohesive contact approach [J]. | MATERIALS TODAY COMMUNICATIONS , 2024 , 41 . |
| MLA | Xue, Xin et al. "Interfacial damage analysis of spiral skeleton-polyurethane composites based on a cohesive contact approach" . | MATERIALS TODAY COMMUNICATIONS 41 (2024) . |
| APA | Xue, Xin , Ye, Zixiong , Lai, Fuqiang . Interfacial damage analysis of spiral skeleton-polyurethane composites based on a cohesive contact approach . | MATERIALS TODAY COMMUNICATIONS , 2024 , 41 . |
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Abstract ：
Passive vibration isolation techniques with low-frequency characteristics have been a hot topic in the aerospace field. A hydraulic inertial vibration isolator is a highly effective type of isolator for controlling low-frequency vibrations. It typically consists of a main spring, a minor spring, an inertial mass, and a fluid domain. Due to its multi-domain nature, analyzing the isolation mechanism of this type of isolator is challenging. The bond graph method is employed to establish the dynamic model of the isolator. Subsequently, the state equations of the isolator are derived, and the energy equations of both the mechanical and the fluid parts of the isolator are obtained. Based on this, the energy transfer characteristics between the mechanical and fluid domains inside the isolator under external excitation are discussed. The time-domain response of the forces transmitted to the foundation is analyzed. It is shown that the anti-resonance frequency occurs when the forces transmitted to the foundation generated by the main spring and the fluid pressure are equal to that of the minor spring. To verify the proposed method's correctness, a prototype of the isolator is designed and a carefully designed experiment is conducted. The acceleration transmissibility of the isolator is used to conduct a comparative study. The results show that the theoretical results are in good agreement with the experimental results. To depict the dynamic characteristics of the isolator under large amplitude vibration, the nonlinear dynamic model of the isolator is developed, and the corresponding force transmissibility of the isolator is formulated. The energy flow between the mechanical and the fluid domains under this condition is also analyzed. The results indicate that the energy flow responses exhibit a similar change tendency to the force transmissibility. However, the peak of the energy ratio between the mechanical subsystem and the fluid is the same as the linear condition, suggesting that this value is determined by the amplification ratio of the isolator. This research provides enhanced physical insight to understand the dynamic characteristics of this type of isolator and will help to shorten the design cycle of the isolator.
Keyword ：
acceleration transmissibility acceleration transmissibility bond graph bond graph energy transfer energy transfer hydraulic inertial isolator hydraulic inertial isolator multi-energy-domain multi-energy-domain
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| GB/T 7714 | Liu, Niuniu , Li, Cheng , Zhang, Liwei et al. The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects [J]. | AEROSPACE , 2024 , 11 (8) . |
| MLA | Liu, Niuniu et al. "The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects" . | AEROSPACE 11 . 8 (2024) . |
| APA | Liu, Niuniu , Li, Cheng , Zhang, Liwei , Lei, Zhiyang , Yang, Jing , Lai, Fuqiang . The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects . | AEROSPACE , 2024 , 11 (8) . |
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