Guofu Gao’s research while affiliated with Henan Polytechnic University and other places

... The scratch test is a semi-destructive method widely employed to assess material resistance to surface damage by scratching [11]. In thermal spray coatings, this technique is particularly useful for assessing adhesion strength [12,13]. ...

Reference:

Influence of Spray Angle on Scratch Resistance of Cold-Sprayed SS316L Deposits

... Furthermore, as illustrated in Fig. 9a, the separated machining mechanism is regarded as one of the most notable features of the UVAM method. Xiang et al. [69] indicated that during general milling operations, the cutting edge consistently maintains close contact with the workpiece material in the cutting zone. This proximity prevents the cutting fluid from effectively entering the cutting area, thereby failing to provide the necessary lubrication and cooling effects, as demonstrated in Fig. 9b. ...

Reference:

Effects of ultrasonic nanolubrication on milling performance and surface integrity of SiCp/Al composites

... Ductile grinding of hard and brittle materials can effectively improve surface quality and reduce subsurface damage depth. As a result, considerable efforts have been expended to achieve ductile grinding of hard and brittle materials, improving machining efficiency by ensuring surface integrity of the crystalline composition [37][38][39][40]. Li et al. [41] conducted ultra-precision grinding experiments to explore surface and subsurface damage in single crystal materials across varying grinding wheel speeds, feed speeds, grinding depths, and abrasive particle sizes. ...

Reference:

Significant Influence on Residual Bending Strength by Cracks Generation During Grinding of Ceramics

... In order to observe the diamond indenter in a short period of time, the speed of the indenter was set to be much greater than that of the scratch experiment. Similarly, the frequency was chosen to be greater than that of the scratching experimental procedure in order to achieve a significant vibration effect during this time [25][26][27], and the dimensions of the SiCp/Al sample are 242.3 Å × 144 Å × 144 Å. ...

Reference:

Study on Material Removal Mechanism of Non-Resonant Vibration-Assisted Scratching High-Volume Fraction SiCp/Al

... Specific parameters such as feed rate, cutting speed, depth of cut, or those related to the materials in contact lead to variations in the tool-part pair tribological behavior. In this aspect, evaluating the effect of friction forces during cutting is a key factor in identifying the cutting conditions that provide the best performance, leading to more stable milling processes over time [2]. ...

Reference:

Harmonic-based-on analysis to discriminate different mechanical actions involved in the machining of hard-to-cut materials

... The simulation results show that the introduction of ultrasonic reduces the damage degree of CFRP in the cutting process, and the tool attached torsional ultrasonic vibration effect is the most significant. Gao et al. [19] developed the model for the mean thrust force under ultrasonic vibration assistance considering both the temperature effect and the tension-compression asymmetry of zirconium-based metallic glass according to the Mohr-Coulomb yield criterion. The impacts of spindle speed, feed rate, and ultrasonic amplitude on the thrust force and the impact of ultrasonic vibration on suppressing crack initiation and propagation were also investigate. ...

Reference:

Enhanced manufacture technology based on emission reduction and carbon reduction in cutting and grinding

... Conclusions are often drawn under specific conditions, and there is a lack of broad applicability analysis for a wide range of operating conditions and material properties. Third, the current research fails to fully utilize modern data analysis techniques such as machine learning, and there is a large untapped potential in the utilization of unlabeled data [6][7]. ...

Reference:

Active learning regression quality prediction model and grinding mechanism for ceramic bearing grinding processing

... For instance, the unique hardness and brittleness of ceramic materials during bearing grinding can result in different chip formation and heat dissipation patterns compared to other materials. These differences require a more in -depth understanding of the grinding mechanism and better -tailored quality prediction models [4][5]. The process of grinding ceramic bearings is significantly different from grinding materials such as metals or plastics. ...

Reference:

Active learning regression quality prediction model and grinding mechanism for ceramic bearing grinding processing

... 2,3 Due to these unique properties, the piezoelectric materials have a wide range of applications in sensors, 4,5 actuators 6 and generators. 7,8 These materials can be divided into four categories include artificial and natural piezocrystals 9 (quartz crystal, 10 Tourmaline, 11 …), piezoceramics 12 (barium titanate, 13 Lead zirconate titanate 14 ), piezoelectric semiconductors 15 (Beryllium oxide, 16 cadmium selenide 17 ) and piezopolymers (PVDF). 18 Polymer-based PENGs inherently exhibit lower piezoelectricity compared to piezoelectric ceramics. ...

Reference:

A multilayer piezoelectric nanogenerator based on PVDF and BaTiO3 nanocomposite with enhanced performance induced by simultaneously electrospinning and electrospraying

... In contrast, SiC p /Al composites with a lower volume fraction of SiC particles exhibit relatively lower hardness, with more uniform material removal during machining, resulting in generally better surface quality [4,5]. Conventional grinding (CG) of SiC p /Al composites causes grinding stress concentration and the abrasive grains directly and forcefully impact the SiC particles, leading to rapid grain wear and the development of various defects in the SiC due to the grinding force [6][7][8]. These issues become more serious in high volume fraction SiC p /Al composites, highlighting the need for an innovative machining process to reduce grinding force and minimize machining damage. ...

Reference:

Study on ultrasonic vibration-assisted grinding characteristics of high volume fraction SiCp/Al composites