| 穴盘水稻秧苗茎秆蠕变与应力松弛特性的试验研究 |
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| 引用本文： | 马瑞峻,萧金庆,郑普峰,张亚丽,陈瑜,邱志.穴盘水稻秧苗茎秆蠕变与应力松弛特性的试验研究[J].农业工程学报,2018,34(13):43-53. |
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| 作者姓名： | 马瑞峻 萧金庆 郑普峰 张亚丽 陈瑜 邱志 |
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| 作者单位： | 华南农业大学工程学院;广东省水稻移栽机械装备工程技术研究中心 |
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| 基金项目： | 国家自然科学基金项目（31471418）；广东省公益研究与能力建设项目（2014A020208105，2014A020208018） |
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| 摘 要： | 为深入了解穴盘水稻秧苗茎秆拉伸过程中的力学特性,该文利用微控电子万能试验机对穴盘水稻秧苗茎秆常规拉伸、蠕变与应力松弛特性进行测试与分析。试验表明:常规拉伸一般有2次断裂,1次断裂前,应力-应变为线性关系,没有明显的屈服过程,且平均断裂应力大小随加载速率的增加而呈线性增加;拉伸蠕变和应力松弛过程分别利用伯格斯四元件模型和麦克斯韦五元件模型进行描述。通过对曲线进行拟合,得到相关的模型参数,基于选用的流变模型和本构方程,结合秧苗茎秆的生物体特点,分别对蠕变速率、蠕变柔量和应力松弛速率、应力松弛时间进行分析,结果表明:蠕变和应力松弛过程都是弹性动力与黏滞阻力之间彼此牵制的过程;蠕变过程产生与蠕变时间和初始应力呈正相关的塑性应变,应力松弛过程导致茎秆大分子链发生变化,均对秧苗茎秆造成一定损伤;秧苗茎秆内部含有柔嫩与粗壮2种组织结构。研究结果可为秧苗机械拔取的损伤评估和相关仿真分析提供参考。
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| 关 键 词： | 蠕变 黏弹性 流变 水稻秧苗 应力松弛 常规拉伸 本构方程 |
| 收稿时间： | 2017/12/4 0:00:00 |
| 修稿时间： | 2018/5/7 0:00:00 |
Experimental study on characteristics of creep and stress relaxation for rice seedling stem raised in cell tray |
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| Ma Ruijun,Xiao Jinqing,Zheng Pufeng,Zhang Yali,Chen Yu and Qiu Zhi.Experimental study on characteristics of creep and stress relaxation for rice seedling stem raised in cell tray[J].Transactions of the Chinese Society of Agricultural Engineering,2018,34(13):43-53. |
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| Authors: | Ma Ruijun Xiao Jinqing Zheng Pufeng Zhang Yali Chen Yu and Qiu Zhi |
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| Institution: | 1. College of Engineering, South China Agricultural University, Guangzhou 510642, China; 2. Engineering Research Center of Guangdong for Rice Transplanting Technology and Equipment, Guangzhou 510642, China;,1. College of Engineering, South China Agricultural University, Guangzhou 510642, China; 2. Engineering Research Center of Guangdong for Rice Transplanting Technology and Equipment, Guangzhou 510642, China;,1. College of Engineering, South China Agricultural University, Guangzhou 510642, China; 2. Engineering Research Center of Guangdong for Rice Transplanting Technology and Equipment, Guangzhou 510642, China;,1. College of Engineering, South China Agricultural University, Guangzhou 510642, China; 2. Engineering Research Center of Guangdong for Rice Transplanting Technology and Equipment, Guangzhou 510642, China;,1. College of Engineering, South China Agricultural University, Guangzhou 510642, China; and 1. College of Engineering, South China Agricultural University, Guangzhou 510642, China; 2. Engineering Research Center of Guangdong for Rice Transplanting Technology and Equipment, Guangzhou 510642, China; |
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| Abstract: | |
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| Keywords: | creep viscoelasticity rheology rice seeding stress relaxation general tensile constitutive equation |
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