Stability Analysis and Experimental Research on Ultrasonic Cutting of Wave-absorbing Honeycomb Material With Disc Cutter

To address the problem of the poor stability of ultrasonic machining of wave-absorbing honeycomb materials, this paper takes ultrasonic cutting of wave-absorbing honeycomb materials with a disc cutter as the research object and establishes a multi-degree-of-freedom mathematical model of the cutting system based on the relative positions of the tool and the honeycomb material and the motion characteristics of the tool. On this basis, modal analysis of the disc tool and the honeycomb cellular element wall plate is carried out to draw the Lobe diagram of ultrasonic cutting stability, the process experimental parameters are determined according to the solved stability Lobe diagram, and machining stability verification experiments are carried out. The experimental results show that the machining parameters in the stable region of the Lobe diagram result in a neat and clean surface, less fibre pullout, a complete outer substrate, and less tool wear than those in the critical and unstable regions, thus verifying the correctness of the theoretical model and the stability Lobe diagram.

Half-integer quantized anomalous thermal Hall effect in the Kitaev material candidate α-RuCl3

Half-integer thermal quantum Hall conductance has recently been reported for the two-dimensional honeycomb material α-RuCl3. We found that the half-integer thermal Hall plateau appears even for a magnetic field with no out-of-plane components. The measured field-angular variation of the quantized thermal Hall conductance has the same sign structure as the topological Chern number of the pure Kitaev spin liquid. This observation suggests that the non-Abelian topological order associated with fractionalization of the local magnetic moments persists even in the presence of non-Kitaev interactions in α-RuCl3.

Nanochannel-based heterometallic {ZnIIHoIII}–organic framework with high catalytic activity for the chemical fixation of CO2

The robust, double-walled, honeycomb material {[ZnHo(TDP)(H2O)]·2DMF·4H2O}n exhibits an excellent catalytic performance in the chemical fixation of CO2 and the efficient detection of Fe(iii) ions in aqueous solution.

On Aluminum Honeycomb Impact Attenuator Designs for Formula Student Competitions

The use of impact attenuators (IA) is important for vehicles as they absorb the kinetic energy exerted from the car crashes to protect the drivers from any possible injuries. Under the framework of the Formula Student (FS) competition, we investigate various designs of IA made of aluminum honeycomb material. Specifically, the crushing behavior of the honeycomb structure is investigated from the theoretical point of view and later verified with numerical simulations. To achieve the desired crushing behavior of the aluminum honeycomb structure, apart from the so-called pre-crushing method, another way to pre-process the aluminum honeycomb is proposed. Modification on the aluminum honeycomb is done in a symmetric manner to ensure the same uniform crushing behavior on the two sides of the mirror plane of the car. Different variations presented in this paper shed a light on future aluminum honeycomb IA designs in the context of FS competitions.

Heterometallic {ZnEu}-metal–organic framework for efficient chemical fixation of CO2

A robust double-walled honeycomb material {[EuIIIZnII(HPTTBA)(H2O)]·4DMF·3H2O}n with excellent catalytic performance for the chemical fixation of CO2 was presented by utilizing a ligand-directed synthetic strategy.

Process path planning based on efficiency model for ultrasonic cutting curved surface of honeycomb composite parts

According to the roughing chip shape, the ultrasonic vibration cutting honeycomb material curved surface parts are divided into two rough machining processes of “V” shape cutting and rectangular cutting. Based on the non-interference characteristic cutter location counting model, the cutting efficiency model is established to select a better process. First, the residual height model of the two processes is established, and the residual height is controlled by longitudinal and lateral lifting the cutter location. Second, using the coordinate system conversion principle, the projection method is used to perform global interference check on the triangular-blade and the disk-blade which are used for ultrasonic cutting honeycomb composite, and then the characteristic cutter location generation method for changing the swing angle to avoid interference is proposed. Finally, a cutting efficiency model is established. Process analysis of case parts shows: when the feed rate of disk-blade is less 0.6 times to that of triangular-blade, the machining efficiency of “V” shape cutting is higher than that of rectangular cutting. When the disk-blade’s feed rate approaches or exceeds the triangular-blade’s, especially under this circumstance that the large parts is cut, the efficiency of the latter is higher.