In order to enhance the performance of the epoxy resin-prepared materials, straw fiber was used as the reinforcing base in this study. The principle of this study is to use the cellulose component exposed after the defibrillation of straw fiber can be further combined with the epoxy group. Firstly, the degree of defibrillation of straw fiber under three different pretreatment methods of acid, alkali and moist heat treatment was explored, and a control test was conducted with untreated straw fiber, which showed that the defibrillation of the straw fiber after alkali treatment was better than the other two methods. Secondly, to prove the comprehensive effect of the pretreatment method and straw fiber filling amount on the composite material performance, this paper carried out a tensile, bending, density and water absorption test. The results showed that when the straw fiber filling was 15%, the best performance of the composites was achieved by the alkali treatment, with tensile strength and tensile modulus reaching 1.89 KN and 3.92 MPa, bending strength and bending modulus reaching 2.00 KN and 81.65 MPa, average water absorption reaching 2.77%, and density reaching 0.957 g/cm³. Finally, the results were verified using Image J software was used for verification. After comparison, the material meets the basic requirements of high-density fiberboard material and provides a reference for preparing straw epoxy resin composites.

In the comprehensive development and utilization of crop straw, it is key to separate the fibers in the straw through a certain process or equipment. In order to obtain rice straw fiber material, the straw fiber crusher was designed using SOLIDWORKS software, and its grinding process was simulated using EDEM software to verify the feasibility of the machine principle and structural rationality. The grinding wheel speed, screw feed shaft speed, and grinding wheel clearance were used as test factors to design a three-factor, five-level test using Design Expert 13, obtaining a grinding wheel speed of 1250 r·min⁻¹, a screw feed shaft speed of 40 r·min⁻¹, and a wheel clearance 0.21 mm, which can achieve a theoretical kWh output of 45.8 kg/(kW·h) and a tensile index of 112.5 N·mg⁻¹. We aimed to establish a model of the pore channel of the specimen, analyze the characteristics of the model within the unit area of different specimens, investigate the intrinsic relationship between the tensile index and the image pore channel coefficient of the straw fiber specimen, and to verify the feasibility and rationality of using the tensile index to evaluate the quality of straw fiber.

Understanding the microscopic interaction between agricultural tillage tools and soil is essential for improving wear resistance. In this study, molecular dynamics (MD) simulations are employed to investigate the tribological behavior of the Fe–SiO₂ interface under varying loads and sliding velocities. The results demonstrate that the coefficient of friction increases with both normal load and sliding velocity, accompanied by a clear running-in stage. Under high loads, significant plastic deformation occurs, characterized by asymmetric atomic pile-up, expansion of the strain field, and heterogeneous von Mises strain distribution. Energy analysis reveals intensified kinetic and potential energy variations, indicating enhanced defect accumulation and interfacial non-equilibrium states. Temperature distributions are highly localized at the interface, with thermal saturation observed under high-velocity conditions. Mean square displacement (MSD) results confirm that higher loads and velocities promote atomic migration and plastic flow. This study provides atomic-scale insights into wear mechanisms under extreme mechanical conditions, offering theoretical support for the design of durable soil-engaging components in agricultural machinery.