Mechanical properties of poplar (NL-3412) branches

The mechanical properties of poplar (NL-3412) branches are the basis for designing and optimizing the working parameters of branch pruning and crushing machinery. In this study, the tensile, compression, bending and shear properties of poplar branches were investigated by utilizing a precision microcomputer-controlled electronic universal testing machine. The test results suggested that the elastic constitutive relationship of the stress–strain curves of poplar branches under longitudinal compression, transverse compression, and bending conformed to Hooke's law, and longitudinal tensile and shear exhibited plastic damage; the anti-failure strength, anti-failure elastic modulus, and external work of poplar branches under longitudinal compression were greater than those under transverse compression. The analysis results indicated that the correlation function between the anti-failure strength and the external force work of poplar branches is positively correlated, and the external force work required to destroy poplar branches can be estimated by the established regression mathematical model. The results of the study can provide important data support for the optimal design of poplar branch pruning and shredding machinery and related simulation experimental research.