Effect of Moisture content and loading positions on the Mechanical properties of New Rice for Africa (NERICA)
Effect of Moisture content and loading positions on the Mechanical properties of New Rice for Africa (NERICA)
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水分含量和装载位置对非洲新稻机械特性的影响 (NERICA)
DOI：
10.5937/poljteh2001038c
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
E. Nkechi
中科院分区：
文献类型：
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作者：
E. Chukwuka;Oluka Sylvester Ikechukwu;E. Nkechi
采用Instron万能试验机（UTM）测定了非洲新稻（NERICA）在12.5、17和21.5% （db）含水率和大、小、中径加载位置下的力学性能。研究的力学性能包括断裂时的最大载荷、最大载荷时的抗压拉伸、生物屈服点载荷、最大载荷时的韧性、刚度、抗压强度、最大载荷时的能量和最大斜率。结果表明，加载方式和含水率对材料的力学性能有显著影响（p < 0.05）。结果表明：断裂、压缩拉伸、生物屈服点最大载荷为363.73 ~ 50.92 N；0.50至2.79毫米；11.58 ~ 6.78 N/mm 2；分别为NERICA Raw-Paddy主径加载；北纬18.46 ~ 5.44度；0.92至2.52毫米；对于NERICA Raw-Paddy小直径加载分别为9.01 ~ 4.08 N/mm 2。对于NERICA parboiled - milling，在大直径和小直径加载位置的结果如下：断裂时最大载荷（156.08 ~ 44.94 N; 94.90 ~ 22.05 N）；压缩延伸（0.59至1.61毫米；0.46至2.67毫米）。力学性能随含水率的变化进行回归分析，各参数之间存在正相关关系。水分含量对各参数均有显著影响（p < 0.05）。
The mechanical properties of New Rice for Africa, (NERICA) were determined on different moisture content levels of 12.5, 17 and 21.5% (db), and loading positions of major, minor, and intermediate diameters using the Instron Universal Testing Machine (UTM). The mechanical properties studied were the maximum load at rupture, compressive extension at maximum load, load at bioyield point, toughness, stiffness, compressive strength, energy at maximum load, and the maximum slope. Results obtained indicated that, the loading pattern and moisture content affected the mechanical properties determined (p < 0.05). Results showed that, maximum load at rupture, compressive extension, load at bio yield point, ranged from 363.73 to 50.92 N; 0.50 to 2.79 mm; and 11.58 to 6.78 N/mm 2 ; respectively for NERICA Raw-Paddy major diameter loading; and from 18.46 to 5.44 N; 0.92 to 2.52 mm; 9.01 to 4.08 N/mm 2 respectively for NERICA Raw-Paddy minor diameter loading. For the NERICA Parboiled-Milled, results at both major diameter and minor diameter loading positions ranged as follows; maximum load at rupture (156.08 to 44.94 N; 94.90 to 22.05 N); compressive extension (0.59 to 1.61 mm; 0.46 to 2.67 mm). Regression analysis were carried out on the mechanical properties with moisture content, and there was positive correlation between the parameters. There were significant effects of moisture content (p < 0.05) on all parameters studied.