During rice threshing, stems are easily broken and usually mixed with the grains, making it difficult for further automatic processing. Thus, in order to improve the efficiency of grain cleaning during harvesting, it is beneficial to reduce the breakages of rice stems. The threshold values of rice stalks in both the transverse and longitudinal directions under tension, compression and bending forces were studied. Based on the real time threshing loads that occur during threshing, the breaking paths of the rice stalks were determined by applying combined loading tests and fracture mechanisms proposed. When subjected to single load, rice stalk is a hard material to break. Tension fracture is the major failure mechanism of the rice internodes that are wrapped with leaf sheath. Combinations of bending & tension or compression & tension can easily break a complete rice stalk or even a cluster of rice straws. Therefore, breaking paths of rice stalks during threshing include the rice stem internodes (with leaf sheath) are easily fractured under the coupling of three-point bending and tension; the stem cores are broken under compression and tension, but the stem nodes are brittle and susceptible to initial damage caused by bending or compression. These findings can help facilitate design of the combine harvesters by assisting with the design of mechanisms that can reduce rice stem breakages during threshing and improve grain stalk separation.

在水稻脱粒过程中，茎容易折断并且通常与谷物混合在一起，因此很难进行进一步的自动加工。因此，为了提高收割期间的谷物清洁效率，减少稻草茎的破裂是有益的。研究了在拉伸，压缩和弯曲力作用下稻谷秸秆在横向和纵向上的阈值。基于脱粒过程中的实时脱粒载荷，通过组合载荷试验和提出的断裂机理，确定了稻秆的断裂路径。当承受单重载荷时，稻秆是很难破碎的材料。张力断裂是水稻叶片包裹叶节的主要破坏机理。弯曲与拉伸或压缩与结合 紧张情绪很容易破坏完整的稻秆，甚至是稻草丛。因此，在脱粒过程中稻秆的断裂路径包括：在三点弯曲和拉力的耦合下，稻茎节间（带​​有叶鞘）很容易断裂。茎干在压缩和拉力作用下会断裂，但茎节很脆，易受弯曲或压缩引起的初始损坏。这些发现可通过协助设计机制来帮助减少联合收割机的设计，这些机制可减少脱粒期间的稻秆断裂并改善谷物秸秆的分离。稻谷脱粒过程中的断裂路径包括稻茎节间（带​​有叶鞘）在三点弯曲和拉力的耦合作用下容易断裂。茎干在压缩和拉力作用下会断裂，但茎节很脆，易受弯曲或压缩引起的初始损坏。这些发现可通过协助设计机制来帮助减少联合收割机的设计，这些机制可减少脱粒期间的稻秆断裂并改善谷物秸秆的分离。稻谷脱粒过程中的断裂路径包括稻茎节间（带​​有叶鞘）在三点弯曲和拉力的耦合作用下容易断裂。茎干在压缩和拉力作用下会断裂，但茎节很脆，易受弯曲或压缩引起的初始损坏。这些发现可通过协助设计机制来帮助减少联合收割机的设计，这些机制可减少脱粒期间的稻秆断裂并改善谷物秸秆的分离。