加载/卸载作用次数对水稻谷粒机械损伤的影响

水稻谷粒在收获、加工、储运过程中的损伤不仅与其所受载荷的大小有关，也与载荷作用次数有关。对水稻谷粒进行多次加载、卸载作用下的压缩试验，研究了水稻谷粒的滞回耗能特性，分析了水稻谷粒的机械损伤机理。通过试验建立了载荷、加载循环次数对水稻谷粒损伤率影响规律的数学模型，并对模型进行了F检验。通过该模型导出了水稻谷粒损伤率为1％时载荷与加载次数间的关系曲线。

Study on Rice Grain Injury under Repeated Loads

During harvesting, handling and transporting, injury of rice grain is not only due to size of the force acting on it but also the number of the loading cycles. The hysteresis energy consuming behavior of rice grain was studied by means of experiments. An investigation on the principles of grain injury was made. The multiply elements quadratic model between the load amplitude, number of the load cycles and the injury percentage of rice grain was developed. Statistical value F was made in order to prove the correctness of the multiply element quadratic model. The relationship between the load amplitude and number of the load cycles was obtained when injury percentage of rice grain was equal to 1%, which provided a base for designs of harvesting, handling and transporting devices.