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中国精品科技期刊2020
高坤,张海红,王娟,等. 挤压对灵武长枣应力应变影响的有限元分析[J]. 食品工业科技,2021,42(20):207−213. doi: 10.13386/j.issn1002-0306.2021020200.
引用本文: 高坤,张海红,王娟,等. 挤压对灵武长枣应力应变影响的有限元分析[J]. 食品工业科技,2021,42(20):207−213. doi: 10.13386/j.issn1002-0306.2021020200.
GAO Kun, ZHANG Haihong, WANG Juan, et al. Finite Element Analysis of the Influence of Extrusion on the Stress and Strain of Lingwu Long Jujube[J]. Science and Technology of Food Industry, 2021, 42(20): 207−213. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021020200.
Citation: GAO Kun, ZHANG Haihong, WANG Juan, et al. Finite Element Analysis of the Influence of Extrusion on the Stress and Strain of Lingwu Long Jujube[J]. Science and Technology of Food Industry, 2021, 42(20): 207−213. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021020200.

挤压对灵武长枣应力应变影响的有限元分析

Finite Element Analysis of the Influence of Extrusion on the Stress and Strain of Lingwu Long Jujube

  • 摘要: 为了分析灵武长枣在采摘过程中内部应力应变对挤压的响应规律,为采摘机器人的设计提供理论依据,本文利用万能力学试验机在15、20、25、30、35 mm/min五种不同挤压速率下对灵武长枣整果进行了横向和纵向压缩,对力-变形曲线进行拟合,求得长枣在压缩破裂时的刚度及破裂力,并对15和35 mm/min两种横向挤压速率进行了有限元模拟,建立了有限元模型。结果表明:灵武长枣在受到挤压时,其力学性能具有各向异性,横向的抗压能力更强。横向压缩时,整果破裂负载为214.34~266.53 N,弹性模量为14.90~17.05 MPa,相对变形量为20.70%~22.67%;纵向压缩时,整果破裂负载为132.52~185.40 N,弹性模量为4.59~6.07 MPa,相对变形量为13.72%~17.25%。受力点的应力应变在果肉中是最大的,并沿赤道向果核周围延伸,且逐渐减小。压缩速率为15 mm/min的有限元模型的模拟值与其实验值的偏差为14.98%,35 mm/min的偏差为11.06%。运用有限元法对灵武长枣挤压模拟是可行的。

     

    Abstract: In order to analyze the response law of internal stress and strain to extrusion of Lingwu jujube during the picking process and provide theoretical basis for the design of picking robot, in the paper universal mechanical testing machine was used to compress the whole fruit horizontally and vertically under five different extrusion rates of 15, 20, 25, 30 and 35 mm/min, and then fit the force deformation curve. The stiffness and fracture force of jujube were obtained. The two lateral extrusion rates of 15 and 35 mm/min were simulated by finite element method, and the finite element model was established. The results showed that the mechanical properties of Lingwu jujube were anisotropic and the lateral compressive capacity was stronger when it was squeezed. Under transverse compression, the whole fruit fracture load was 214.34 ~ 266.53 N, the elastic modulus was 14.90~17.05 MPa and the relative deformation was 20.70%~22.67%. During longitudinal compression, the whole fruit fracture load was 132.52~185.40 N, the modulus of elasticity was 4.59~6.07 MPa, and the relative deformation was 13.72%~17.25%. The stress and strain of the stress point was the largest in pulp, and extended along the equator to the surrounding fruit core, and decreased gradually. The difference between the simulation value and the experimental value of the finite element model with compression rate of 15 mm/min was 14.98%, and the deviation of 35 mm/min was 11.06%. It was feasible to apply the finite element method to the simulation of Longwu jujube extrusion.

     

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