蓖麻茎秆冲击剪切力学性能试验与分析OA

Castor is an important industrial oil crop;however,its stems exhibit relatively high mechanical strength,resulting in high cutting resistance and energy consumption during mechanized harvesting.To address this issue,this study investigated the shear and impact mechanical properties of castor stems using Tongbi 11 as the test material.The effects of key agronomic and operating factors on the mechanical properties of the stems were evaluated,and regression models were established based on the experimental results.The results showed that,in the shear tests,the factors significantly affecting stem shear strength,in descending order of significance,were shear angle,shear velocity,and moisture content.In the impact tests,the factors significantly affecting stem failure energy,in descending order of significance,were impact blade angle,sampling position,and moisture content.Response surface methodology was subsequently employed to optimize the operating parameters.The optimal conditions for the shear test were a shear angle of 28.69°,shear velocity of 30 mm/min,and moisture content of 50%,whereas the optimal conditions for the impact test were an impact blade angle of 30°,sampling position at the middle section of the stem,and moisture content of 40%.Verification experiments showed that the relative errors between the predicted and measured values were less than 3%,demonstrating the high predictive accuracy of the established models.