基于压缩实验的酥梨果肉弹性模量和泊松比
|
摘要
为研究酥梨果肉的弹性模量和泊松比,制作了柱形酥梨果肉试样,开展了围压和无围压两组酥梨果肉压缩实验,得到了酥梨果肉的压力-位移曲线。通过计算获得酥梨果肉的真实应力-应变曲线、弹性模量和泊松比。当压缩应变在0～0. 1范围内时,酥梨果肉的弹性模量随压缩应变呈增大趋势,而泊松比随压缩应变减小。在压缩应变为0. 02、0. 04、0. 06、0. 08、0. 1时,酥梨果肉的弹性模量分别为6. 19×10~5、9. 63×10~5、1. 28×10~6、1. 56×10~6、1. 81×10~6Pa,泊松比分别为0. 421、0. 409、0. 391、0. 364、0. 314。同时,建立了酥梨果肉压缩实验相应的有限元模型,对确定泊松比和弹性模量的实验方法的有效性进行了验证,对实验过程中摩擦的影响进行了分析;并应用测得的酥梨果肉弹性参数对实验过程进行了模拟,模拟得到结果与实验结果符合较好。实验结果将为酥梨采摘、分选、包装和运输机械的设计提供设计依据。
In order to study the elastic modulus and Poisson's ratio of the pear fruit flesh,cylindrical-shaped samples of pear fruit flesh was prepared,two groups of pear fruit flesh compression test of restrained and unrestrained was carried out,obtained the pressure-displacement curve of the pear fruit flesh,and the true stress-strain curve,elastic modulus and Poisson's ratio were obtained by calculation. When the compressive strain is in the range of 0 ～ 0. 1,the elastic modulus of the pear fruit flesh increases but the Poisson's ratio decreases slightly with the compressive strain. When the compressive strain is 0. 02,0. 04,0. 06,0. 08,0. 1,the elastic modulus of the pear fruit flesh is 6. 19 × 10~5,9. 63 × 10~5,1. 28 × 10~6,1. 56 × 10~6 and 1. 81 × 10~6 Pa,the Poisson's ratio is0. 421,0. 409,0. 391,0. 364,0. 314,respectively. And then,the finite element model of the pear fruit flesh compression experiment was established,the validity of the experimental method for determining Poisson's ratio and elastic modulus was verified,the effected of the friction during the experiment was analyzed,and the experimental process was simulated by using the measured elastic parameters of pear fruit flesh,the result obtained by simulation is in good agreement with the experimental results. The experimental results will provide design basis for the design of pear picking,sorting,packaging and transportation machinery.
In order to study the elastic modulus and Poisson's ratio of the pear fruit flesh,cylindrical-shaped samples of pear fruit flesh was prepared,two groups of pear fruit flesh compression test of restrained and unrestrained was carried out,obtained the pressure-displacement curve of the pear fruit flesh,and the true stress-strain curve,elastic modulus and Poisson's ratio were obtained by calculation. When the compressive strain is in the range of 0 ～ 0. 1,the elastic modulus of the pear fruit flesh increases but the Poisson's ratio decreases slightly with the compressive strain. When the compressive strain is 0. 02,0. 04,0. 06,0. 08,0. 1,the elastic modulus of the pear fruit flesh is 6. 19 × 10~5,9. 63 × 10~5,1. 28 × 10~6,1. 56 × 10~6 and 1. 81 × 10~6 Pa,the Poisson's ratio is0. 421,0. 409,0. 391,0. 364,0. 314,respectively. And then,the finite element model of the pear fruit flesh compression experiment was established,the validity of the experimental method for determining Poisson's ratio and elastic modulus was verified,the effected of the friction during the experiment was analyzed,and the experimental process was simulated by using the measured elastic parameters of pear fruit flesh,the result obtained by simulation is in good agreement with the experimental results. The experimental results will provide design basis for the design of pear picking,sorting,packaging and transportation machinery.
引文
1张孝亲.中国果品业全球价值链地位提升研究[D].杭州:浙江大学,2017Zhang Xiaoqing. Research on the promotion of the global value chain status of China's fruit industry[D]. Hangzhou:Zhejiang University,2017
2 方诤,吴建毅,杨富华.果蔬预冷及冷链物流中外对比研究[J].冷藏技术,2016(1):16-18Fang Zheng,Wu Jianyi,Yang Fuhua. Comparative study on fruit and vegetable pre-cooling and cold chain logistics[J]. Refrigeration Technology,2016(1):16-18
3 冯荣新.考虑鲜度的鲜活农产品库存路径优化[D].郑州:河南大学,2017Feng Rongxin. Optimization of stock path of fresh agricultural products considering freshness[D]. Zhengzhou:Henan University,2017
4 王维,刘东琴,王佩.果品分级检测技术的研究现状及发展[J].包装与食品机械,2016(6):55-58Wang Wei,Liu Dongqin,Wang Pei. Research status and development of fruit grading detection technology[J]. Packaging and Food Machinery,2016(6):55-58
5 王少敏.梨产业现状及发展趋势[J].农业知识,2018(2):19-21Wang Shaomin. Pear industry status and development trend[J]. Agricultural Knowledge,2018(2):19-21
6 李晓娟.鸭梨机械损伤机理及运输包装研究[D].天津:天津科技大学,2008Li Xiaojuan. Study on mechanical damage mechanism and transportation packaging of Yali[D]. Tianjin:Tianjin University of Science and Technology,2008
7 胡洋.皇冠梨振动损伤试验与缓冲包装结构设计[D].北京:北京林业大学,2016Huyang. Crown pear vibration damage test and buffer packaging structure design[D]. Beijing:Beijing Forestry University,2016
8 Pham Q T,Liou N S. Investigating texture and mechanical properties of Asian pear flesh by compression tests[J]. Journal of Mechanical Science&Technology,2017,31(8):3671-3674
9 田芳,刘财喜,刘芳,等. Q235钢真实应力-应变曲线研究[J].中南林业科技大学学报,2011,31(4):182-186Tian Fang,Liu Caixi,Liu fang,et al. Study on true stress-strain curve of Q235 steel[J]. Journal of Central South University of Forestry and Technology,2011,31(4):182-186
10 左岳.圆柱体单轴压缩实验的数值模拟与分析[D].合肥:安徽工业大学,2014Zuo Yue. Numerical simulation and analysis of cylindrical uniaxial compression experiments[D]. Hefei:Anhui University of Technology,2014
11 何著,赵寿根,杨嘉陵,等. 0Cr17Ni4Cu4Nb不锈钢动态力学性能研究[J].材料科学与工程学报,2007,25(3):418-421He Zhu,Zhao Shougen,Yang Jialing,et al. Study on dynamic mechanical properties of 0Cr17Ni4Cu4Nb stainless steel[J]. Journal of Materials Science and Engineering,2007,25(3):418-421
12 周祖锷.农业物料学[M].北京:农业出版社,1994:42-44Zhou Zue. Agricultural materials science[M]. Beijing:Agriculture Press,1994:42-44
13 黄榜彪,李晓,黄秉章,等.造纸白泥烧结页岩多孔砖的抗压性能及弹性模量[J].科学技术与工程,2017,17(35):300-306Huang Bangbiao,Li Xiao,Huang Bingzhang,et al. Compressive properties and elastic modulus of porous shale porous bricks from paper-making white mud[J]. Science Technology and Engineering,2017,17(35):300-306
14 Gyasi S,Fridley R B,Chen P. Elastic and viscoelastic poisson's ratio determination for selected citrus fruits[J]. Transactions of the American Society of Agricultural Engineers,1981,24(3):747-750
15 Baerdemaeker D,Josse G. Experimental and numerical techniques related to the stress analysis of apples under static load[D]. East Lansing:Michigan State University,1975
2 方诤,吴建毅,杨富华.果蔬预冷及冷链物流中外对比研究[J].冷藏技术,2016(1):16-18Fang Zheng,Wu Jianyi,Yang Fuhua. Comparative study on fruit and vegetable pre-cooling and cold chain logistics[J]. Refrigeration Technology,2016(1):16-18
3 冯荣新.考虑鲜度的鲜活农产品库存路径优化[D].郑州:河南大学,2017Feng Rongxin. Optimization of stock path of fresh agricultural products considering freshness[D]. Zhengzhou:Henan University,2017
4 王维,刘东琴,王佩.果品分级检测技术的研究现状及发展[J].包装与食品机械,2016(6):55-58Wang Wei,Liu Dongqin,Wang Pei. Research status and development of fruit grading detection technology[J]. Packaging and Food Machinery,2016(6):55-58
5 王少敏.梨产业现状及发展趋势[J].农业知识,2018(2):19-21Wang Shaomin. Pear industry status and development trend[J]. Agricultural Knowledge,2018(2):19-21
6 李晓娟.鸭梨机械损伤机理及运输包装研究[D].天津:天津科技大学,2008Li Xiaojuan. Study on mechanical damage mechanism and transportation packaging of Yali[D]. Tianjin:Tianjin University of Science and Technology,2008
7 胡洋.皇冠梨振动损伤试验与缓冲包装结构设计[D].北京:北京林业大学,2016Huyang. Crown pear vibration damage test and buffer packaging structure design[D]. Beijing:Beijing Forestry University,2016
8 Pham Q T,Liou N S. Investigating texture and mechanical properties of Asian pear flesh by compression tests[J]. Journal of Mechanical Science&Technology,2017,31(8):3671-3674
9 田芳,刘财喜,刘芳,等. Q235钢真实应力-应变曲线研究[J].中南林业科技大学学报,2011,31(4):182-186Tian Fang,Liu Caixi,Liu fang,et al. Study on true stress-strain curve of Q235 steel[J]. Journal of Central South University of Forestry and Technology,2011,31(4):182-186
10 左岳.圆柱体单轴压缩实验的数值模拟与分析[D].合肥:安徽工业大学,2014Zuo Yue. Numerical simulation and analysis of cylindrical uniaxial compression experiments[D]. Hefei:Anhui University of Technology,2014
11 何著,赵寿根,杨嘉陵,等. 0Cr17Ni4Cu4Nb不锈钢动态力学性能研究[J].材料科学与工程学报,2007,25(3):418-421He Zhu,Zhao Shougen,Yang Jialing,et al. Study on dynamic mechanical properties of 0Cr17Ni4Cu4Nb stainless steel[J]. Journal of Materials Science and Engineering,2007,25(3):418-421
12 周祖锷.农业物料学[M].北京:农业出版社,1994:42-44Zhou Zue. Agricultural materials science[M]. Beijing:Agriculture Press,1994:42-44
13 黄榜彪,李晓,黄秉章,等.造纸白泥烧结页岩多孔砖的抗压性能及弹性模量[J].科学技术与工程,2017,17(35):300-306Huang Bangbiao,Li Xiao,Huang Bingzhang,et al. Compressive properties and elastic modulus of porous shale porous bricks from paper-making white mud[J]. Science Technology and Engineering,2017,17(35):300-306
14 Gyasi S,Fridley R B,Chen P. Elastic and viscoelastic poisson's ratio determination for selected citrus fruits[J]. Transactions of the American Society of Agricultural Engineers,1981,24(3):747-750
15 Baerdemaeker D,Josse G. Experimental and numerical techniques related to the stress analysis of apples under static load[D]. East Lansing:Michigan State University,1975