Experimental research of extrusion mechanical properties of mung beans

In order to master the comminution mechanism, so as to reduce the mechanical damage in the harvest, storage, and transportation, static extrusion tests of mung beans were conducted at different loading speed, loading methods and moisture contents ( from 9.3% to 12.8% ) by using material mechanics test machine. The experiment results showed that the elastic modulus of mung beans was 153.4 ～ 247.7MPa, the yield strength was 0.23～0.98MPa, the failure load was 42.62～81.72N, and the maximum strain was 0.25% ～0.61% .With the increase of moisture contents, the maximum strain of mung beans was increased, but the elastic modulus, failure load and yield strength were decreased obviously. At the same moisture contents, the failure load and yield strength were larger when the mung beans extruded in the position of standing or lying on its side and they were smaller when mung beans lying flat.Meanwhile, the elastic modulus was larger when mung beans standing or lying flat and it was smaller when lying on its side. In the test parameters selection scope, loading speed did not obviously effect on extrusion ability of mung beans.The shape, position and features of cracks in loading surface was various under 3 different loading methods.