In order to address the limitations of limited flexibility, poor mechanical durability, and insufficient biocompatibility of traditional wearable pneumatic wrists, this paper introduces a novel structural material of phosphorus conjugated microporous polymer as a pneumatic flexible actuator. Firstly, this paper prepares phosphorus containing conjugated microporous compounds using the Sonogashira method, and then uses the prepared phosphorus containing conjugated microporous compounds as materials for pneumatic flexible actuators to obtain actual actuators. On this basis, this paper combines commonly used materials to develop a wearable conjugate material pneumatic wrist. Finally, this paper conducts a control analysis on the deformation and mechanical properties of the pneumatic wrist. The research results indicate that when the wrist joint movement angle is 90 degrees, the output torque of the wearable conjugate material pneumatic wrist under a pressure of 0.02 MPa is 0.039. This indicates that the wearable conjugate material pneumatic wrist has good safety and adaptability.
This paper uses finite element analysis and fibre optic sensing technology to dynamically monitor and analyse the stress and strain changes of materials during the removal of reinforced concrete internal support beams, revealing the impact of different removal processes on the mechanical properties of materials. First, a three-dimensional finite element model is established using ANSYS, and the material parameters of the steel bars and concrete are input. Second, fibre optic Bragg grating (FBG) sensors are placed at key locations on the support beams to collect stress and strain data, which are then processed using Python. Finally, BIM technology is used to optimise the demolition sequence, and the impact of dynamic loads on the structure is evaluated based on finite element analysis. The experimental data revealed the effects of different demolition methods on the mechanical properties of reinforced concrete support beams.
Traditional carbon fibre composite manufacturing processes, such as hand lay-up and moulding, often encounter challenges including complex geometry, low manufacturing precision, and a disconnect between design and manufacturing. Especially when dealing with complex structural designs, it is challenging to precisely control the fibre arrangement and internal structure, resulting in low production efficiency and difficulty in meeting high-performance requirements. This paper applies a 3D printing manufacturing process to provide a more efficient and precise design and manufacturing solution. The design and modelling of carbon fibre composite materials are carried out through computer-aided design (CAD) software, considering factors such as fibre arrangement, stacking order, geometry, and material thickness. The material properties are adjusted according to the requirements, and the model is converted into the STL (stereolithography) format required for 3D printing.
There is an inherent 'collaborative failure' in product recycling and remanufacturing in CSCs, which stems from the conflict between individual members pursuing personal interests maximisation and optimising overall system efficiency. To address this conflict, this paper proposes a blockchain driven collaborative innovation mechanism centred around cost-effective shared smart contracts. This paper constructs a Stackelberg game model to characterise non cooperative benchmarks and a cooperative game model to maximise system profits, and then uses a hybrid genetic simulated annealing algorithm to solve the optimal coordination strategy. The simulation results show that this mechanism increases the total profit of the supply chain from 6.37 million yuan to 7.98 million yuan, and the product recovery rate from 28.0% to 55.0%. Research has shown that this mechanism can balance individual rationality and system optimisation, solve the dilemma of 'collaborative failure', and provide executable decision support for value co creation in closed-loop supply chains.
This paper proposes a nanostructure control algorithm based on the photothermal conversion effect. First, a copper/iron-based metal-organic framework (MOF) material is prepared by solution impregnation and loaded with gold nanoparticles to enhance light absorption. The localised surface plasmon resonance (LSPR) effect is then exploited to improve photothermal conversion efficiency. Then, a temperature/light dual-sensing mechanism is established. The drift of the reflectance spectrum of thermochromic molecules and the change of the absorption coefficient of photochromic units are used to separate the coupled signals through a linear decoupling model to reduce cross-interference. Finally, a three-layer fully connected artificial neural network (ANN) is combined with the normalised temperature/light signals as input. The weights are optimised through the back-propagation algorithm, and the Lab colour space parameters are output to drive the light-emitting diode (LED) and the colour-changing element to meet the needs of high-end decorative lighting for dynamic environment adaptability.
Given the increasing demand for lightweight materials, polyetheretherketone (PEEK) is gaining attention as a potential alternative to metals. To evaluate its mechanical suitability for engineering applications, it is necessary to predict the elastic, plastic, and fracture behaviour of PEEK under common loading conditions. The tensile, compressive, and three-point bending experiments were conducted on the PEEK specimens in this study. The yield and failure strains of PEEK were 2.27% and 4.69% in tension and 3.88% and 5.79% in compression. Based on the continuum damage mechanics, the back-calculation analyses were performed to predict the damage variable expression. Subsequently, a simulation model for PEEK under different loading conditions was developed. The back-calculation results identified optimal damage variable yield index (Dy) values of 0.295 for tension and 0.465 for compression. These findings validated the feasibility and applicability of the proposed model, providing a foundation for further investigations into the mechanical properties of PEEK material.
The parameters affecting the drawing process of 410 stainless steel tube were determined such as die angle, friction coefficient and drawing force. Microstructural changes using optical microscopy included elongated grains and distribution of chromium carbide precipitates in the matrix. Using uniaxial tensile testing and the Johnson-Cook equation, parameters related to material deformation were obtained. Evaluation of XRD patterns after drawing showed the formation of preferential orientations from {110} to {200}. The highest texture coefficient was related to the {200}. In addition, ring tests showed that the best lubricants for drawing were oxalate and soap, which provided lowest friction. Also, based on the simulation results, the optimal half-die angles of drawing were attained as 16 degrees, which resulted in the lowest drawing force.
Given the high toxicity of microcystin-RR (MC-RR) and its persistence in drinking water systems, this study aims to provide a viable and efficient solution for its removal using zinc ferrite nanoparticles. Various experimental parameters influencing adsorption efficiency were examined, including initial MC-RR concentration, pH, adsorption time, and temperature. The surface charge properties of nano-ZnFe2O4 and MC-RR were investigated, and the electrostatic interactions during the adsorption process were analysed through the examination of various ion types and a comparison of Fourier-transform infrared (FTIR) spectra before and after adsorption. The adsorption performance of nano-ZnFe2O4 revealed that the adsorption kinetics and isotherms could be effectively described by the pseudo-second-order model and the Langmuir model, respectively. The empirical findings demonstrated that nano-ZnFe2O4 functioned as an effective adsorbent and achieved a maximum removal capacity of 1.28 mg/L for MC-RR at 273 K. The negative values of free energy (Delta G) and enthalpy change (Delta H) also confirmed that the process is both spontaneous and exothermic, which is favourable for adsorption.
This article aims to simulate geomaterial alterations in hydraulic concrete constructions through experimentation. Three types of unreinforced concrete were identified (I, II and III), two of which (II and III) were alkali-reactive and doped with Na2Oeq, and were then compared with the control concrete (I). Then 27 cores were obtained from 9 beams following a three-point mechanical bending test. The conservation period of 28 weeks was in a heated and saturated environment 100% RH; 12-50 degrees C. Additional treatment is only considered for the cores to investigate the internal concrete matrix and determine very short-term water absorption (24 to 48 hours), divided into three states: normal, dry, and saturated, an ultrasonic test NDT is planned during the treatment. The monitoring results demonstrate the following: 0.6% AAR expansion, 2 mm (CO) width crack opening; a 60% decrease in velocity. The statistical method (PCA) is used to elucidate the correlations between the experiment duration and pathological symptoms.
In packaging material research, insufficient attention has been paid to biodegradable and traceable materials. This paper aims to explore the environmental friendliness and application potential of traceable biodegradable packaging materials. This paper modified polylactic acid (PLA) with talc and calcium carbonate (particle size less than 10 microns) at a 20% addition ratio. A traceability system based on Hyperledger Fabric was constructed to enhance transparency, and a life cycle assessment was conducted using SimaPro software. Experimental results showed that the modified PLA exhibited good degradation properties in soil and compost environments, good mechanical and thermal properties, and a total energy consumption of 7.95 MJ and total greenhouse gas emissions of 6.34 kg CO2e over its entire life cycle. These results demonstrate the environmental friendliness of the modified PLA in practical applications and provide new perspectives for future packaging material design, which will contribute to the industry's environmentally friendly development.
