谷子秸秆生物力学性质试验研究

Experimental study on the biomechanical properties of millet stem

谷子茎秆自然干燥后可作为饲草直接饲喂骡马类大牲畜,或应用于混合饲料的配料。在粉碎、切段、揉丝等加工装备参数优化中,需要研究其秸秆材料的生物力学性质。本文试验研究了自然干燥后的谷子秸秆材料的生物力学性质,主要测试了弯曲强度、剪切强度、拉伸强度、弹性模量等力学性质指标。试验结果表明,谷子茎秆的拉伸强度较高,抗拉能力接近木质类材料;剪切强度沿节间有变化,根部较强,上面节较低;弯曲强度值反映出的是整体管状截面皱褶弯折失效的极限值;弹性模量随节间位置的变化不大,表明谷子茎秆材料整体比较均匀。结果可为谷子茎秆收获、加工及利用装备设计和农业设施材料利用提供参考。

Millet stem can be used as forage to fed livestock directly such as horse and mule.It also can be used as burden of the mixed feed.The biomechanical properties of millet stem should be studied to provide the selection of some design parameters on processing equipment like crushing process,dissection process,pulverization process and its process parameters optimization.In this paper,biomechanical properties of natural drying millet stem have been studied,mainly testing its bending strength,shear strength,tensile strength and elastic modulus.The results showed that the bending strength of millet stem was superior,with its tensile strength closing to wooden materials.While its shearing strength varied along different internodes,greater in the root and lower in the upper.What the bending strength reflects on was the limit value of bending failure of integral tubular section.Elastic modulus hardly change,manifesting its integration was uniform.All of these provide the beneficial reference for many sides such as the millet stem reaping,processing and utilization as well as the designing of agricultural equipment and facilities.