Corn stalk orientation effect on mechanical cutting
Corn stalk orientation effect on mechanical cutting
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DOI：
10.1016/j.biosystemseng.2010.07.005
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发表时间：
2010-10-01
影响因子：
5.1
通讯作者：
Sokhansanj, S.
中科院分区：
文献类型：
--
作者：
Igathinathane, C.;Womac, A. R.;Sokhansanj, S.
提高生物质尺寸减小的效率的研究努力可以导致显著的节能。本文以干玉米秸秆为试验材料（15%-20%湿基），研究了试样相对于切割元件的取向对切割能量的影响，并对可能的切割能量降低进行了量化。为了评估玉米秸秆的机械切割特性，通过用具有30度单斜面锋利刀刃的切割元件替换其钝边切割元件来修改Warner-Bratzler装置。利用万能试验机分析了玉米秸秆在垂直（90 °）、倾斜（45 °）和平行（0 °）方向上节间和节部的切削力-变形特性，并对切削力、能量、极限应力和比能进行了分析。结果表明，玉米秸秆切削力-位移特性随方位、节间和节材的不同而不同。总的来说，峰值破坏力、节间和节段的总切割能随茎横截面积的不同而变化显著（P < 0.05）。干玉米秸秆节间的比能值（单位切割面积的总能量）为11.3 ~ 23.5kN·m（-1），节为8.6 ~ 14.0kN·m（-1）。平行取向（沿着晶粒）与垂直取向（横穿晶粒）相比，使切削应力和比能显著降低，对于节间降低至十分之一或更好，对于节点降低至约五分之一。由Elsevier Ltd代表IAgrE出版。
Research efforts that increase the efficiency of size reduction of biomass can lead to a significant energy saving. This paper deals with the determination of the effect of sample orientation with respect to cutting element and quantify the possible cutting energy reduction, utilising dry corn stalks as the test material (15%-20% wet basis). To evaluate the mechanical cutting characteristics of corn stalks, a Warner-Bratzler device was modified by replacing its blunt edged cutting element with one having a 30 degrees single bevel sharp knife edge. Cutting force-deformation characteristics obtained with a universal testing machine were analysed to evaluate the orientation effects at perpendicular (90 degrees), inclined (45 degrees), and parallel (0 degrees) orientations on internodes and nodes for cutting force, energy, ultimate stress, and specific energy of corn stalks. The corn stalks cutting force-displacement characteristics were found to differ with orientation, and internode and node material difference. Overall, the peak failure force, and the total cutting energy of inter-nodes and nodes varied significantly (P < 0.05) with stalk cross-sectional area. The specific energy values (total energy per unit cut area) of dry corn stalk internodes ranged from 11.3 to 23.5 kN m(-1), and nodes from 8.6 to 14.0 kN m(-1). The parallel orientation (along grain) compared to perpendicular (across grain) produced a significant reduction of the cutting stress and the specific energy to one-tenth or better for internodes, and to about one-fifth for nodes. Published by Elsevier Ltd on behalf of IAgrE.