Test Of Biomechanics Properties On Wheat Stalk And Mechanics Evaluation Of Wheat Lodging Resistance Properties

With the change of the agriculture mode of production and the agriculture modernizes the propulsion of the progress, agricultur(?) engineering course application realm expands continuously. The agriculture material mechanics characteristic has been widely used in the realm of agriculture engineering and has made quiet great progress in many researches about foundation theories, application and experiments. What's more, stalk crops contain many technique problems that relates to the mechanics properties of crop in whole production, homework process in the expansion process of the new techniques of agriculture engineering, therefore, it should be researched in the foundation and experiment so that physics parameters and mechanics properties of the material are studied, and theoretic basis and characteristic indexes that act as references in production are obtained.To aim at lodging problems of stalk crops, the moment of inertia, Young's modulus, bending rigidity, bending intensity and shear strength are measured and relevant changing trends are studied for different wheat varieties(high stalk, medium stalk and short stalk) in different growth periods .and different internodes on this paper. At the same time, Wheat lodging resistance properties that based on the test data about bending properties of wheat stalk is evaluated, and grey related analysis is introduced between biomechanics indexes and lodging exponent in different wheat varieties in different growth period. Whether the equal relational grade analysis or the weighted grade analysis, the results show relationship degree, Young's modulus>bending intensity>the moment of inertia>bending rigidity, and the effect of Young's modulus on lodging indexes is maximal.In the course of evaluation of stem lodging resistance in wheat, the weight of biomechanics indexes needs to be determined. According to the principle of making evaluation indexes, four indexes that Young's modulus, bending intensity, the moment of inertia, bending rigidity are presented on the basis of consultation and investigation, and their weights are in turn 0.467, 0.278, 0.160, 0.095 with Analytic Hierarchy Process, and lodging resistance in wheat is evaluated quantificationally by using these biomechanics indexes, which is very important for excellent a sieving, the mechanization produces and agricultural product of deep process.