# Simulation Analysis of Fracture Process of High Moisture Content Corn Kernel Carpopodium
## 1 Introduction
[22] conducted a high-speed photographic observation experiment of wet corn threshing. It was found that the ears of corn were often broken into pieces when they passed through the threshing drum. Grains were threshed more easily and earlier on divided ears than on undivided ears, suggesting that pre-divided ears reduced grain damage. [PERSON] et al. [23] use systems analysis methods to pinpoint the flow principles of mechanized production lines, establish algorithms for automated system operation, and design agricultural machinery. In order to minimize the damage to corn grains, the process sequence of the axial-flow rotary threshing separation device was designed, in which the ear was fed into a strictly oriented spatial position with a partially broken grain structure. [PERSON] et al. [24] designed a new type of composite threshing drum to reduce the kernel breaking rate of corn. Dynamic balance correction and modal analysis of the corn threshing drum were carried out to verify the performance, reliability, and safety of threshing. Through finite element simulation of the dynamic equilibrium, we obtained the supporting reaction force at both ends of the threshing drum. The dynamic unbalance was determined, and dynamic weight compensation was carried out according to the simulation results. The dynamic balance test proves the feasibility of the dynamic balance design of the threshing drum. Modal analysis determines the vibration of the threshing drum in the free state. The natural frequency and the maximum-vibration displacement of each mode are calculated. [PERSON] et al. [25] designed a threshing device by means of a threshing drum, a porous cage, a grain spiral conveyor and a corn cob feed hole. The research methodology included analysis (functional and structural design), design, test performance, evaluation, and modification. The static performance test for a corn cob was carried out. The performance of the threshing device was already quite good. The results showed that the prototype with the last modification (C) had the best performance. The threshing efficiency was 93.75%; the unstripped rate was 6.25%; and the cleanliness was 90.68%. The threshing capacity was 358.28 kg/h, and the corn feeding capacity was 420.05 kg/h. In summary, it can be seen that there has been some progress in the threshing mode of corn kernels, the connection model between the kernel and the corn cob, and the damage of the threshing method on the corn kernels, but there is still a lack of corresponding research on the connection model between the corn kernel and the corn cob [12; 26; 27]. Therefore, studying the connection and fracture process of the corn corpopodium and the corn cob is important. The objective of this study was to reduce the high damage rate of corn kernels during threshing. At present, there is sparse research on corn carpopodium fracture. In this paper, the triaxial fracture of the corn carpopodium was tested on two corn varieties. The basic parameters of the carpopodium fracture of corn were obtained by applying load to the corn under radial stretch, axial shear, and tangential shear. The process of the carpopodium fracture of the corn kernel was analyzed by static structure simulation, and the corn ear discrete test bench verified the analysis process. This study could provide theoretical guidance for corn threshing with low damage and offer an analysis of the threshing process.