Characterization of mechanical properties of scallion white under mechanical load damage

doi:10.3969/j.issn.1004-1524.20231388

Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (11): 2627-2634.DOI: 10.3969/j.issn.1004-1524.20231388

• Biosystems Engineering • Previous Articles Next Articles

Characterization of mechanical properties of scallion white under mechanical load damage

LIN Shengbo¹(), WANG Bangzhui¹, WU Meiling², LI Yajian², WANG Guoqiang²^,³^,^*(), TANG Zhong¹^,³

1. College of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
2. Department of Agricultural Engineering, Jiangsu Agricultural and Animal Husbandry Technology Vocational College, Taizhou 225300, Jiangsu, China
3. Key Laboratory of Agricultural Equipment and Intelligent High Technology Research in Jiangsu Province, Zhenjiang 212013, Jiangsu, China

Received:2023-12-11 Online:2024-11-25 Published:2024-11-27

Abstract

Abstract:

In order to improve the mechanical harvesting quality of scallion, the mechanical parameters of scallion white were tested in this study, aiming to reveal the damage failure mechanism and provide reference for the research and development of low-loss harvesting equipment for scallion. The relationship between the mechanical parameters and the diameter of the scallion white was analyzed by using regression curve, and the internal component structure of scallion white was analyzed. The results showed that the component contents of membranous sheath, fleshy sheath and young leaves in pseudostem were 15.82%, 19.18% and 65.00%, respectively. The tensile strength, compressive strength and elastic modulus of scallion white were 0.48 MPa, 0.54 MPa and 0.16 MPa, respectively. The maximum breaking force and the minimum breaking force were 33.77 N and 16.43 N respectively. The maximum bending force ranged from 25 N to 40 N. The relationship between tensile strength, compressive strength and elastic modulus and diameter was a quadratic nonlinear curve. Based on the mechanical properties of scallion white, it was found that the strength levels of different components in scallion were inconsistent. Under the same load, the inner fiber tissue toughness of young leaves in pseudostem was stronger. The larger the diameter of scallion white, the stronger the toughness of the internal fiber tissue, the greater the tensile strength, and the later the fracture time. The research results can provide theoretical basis for the design of mechanical harvesting equipment for scallion and the reduction of mechanical damage during harvesting.

Key words: scallion white, break, mechanical load, mechanical property

CLC Number:

S233.74

LIN Shengbo, WANG Bangzhui, WU Meiling, LI Yajian, WANG Guoqiang, TANG Zhong. Characterization of mechanical properties of scallion white under mechanical load damage[J]. Acta Agriculturae Zhejiangensis, 2024, 36(11): 2627-2634.

Figures/Tables 11

Fig.1 Plant structure of scallions

Fig.2 Scallion white cross-section

Table 1 Axial distribution table of the content of scallion white components

试样 Sample	直径 Diameter/mm	膜质叶鞘含量 Membranous sheath content/%	肉质叶鞘含量 Fleshy leaf sheath content/%	假茎内幼叶含量 Content of young leaves in pseudostem/%
1	10.28	10.85	9.33	79.82
2	7.74	22.58	26.88	50.54
3	10.77	14.92	18.99	66.09
4	10.57	15.70	17.36	66.94
5	8.81	15.42	24.67	59.91
6	10.88	15.44	17.89	66.67
平均值Average value	9.84	15.82	19.18	65.00
方差Variance	1.28	3.78	6.19	9.62

Fig.3 Experimental device for mechanical properties of scallions

Fig.4 Axial tensile test displacement-force curve

Fig.5 Regression curve between tensile strength and diameter

Fig.6 Radial compression test displacement-force curve

Fig.7 Regression curve between compressive strength and diameter

Fig.8 Displacement-force curve of three-point bending test

Fig.9 Regression curve of elastic modulus and diameter

Table 2 Experimental results of mechanical properties of scallion white

特性 Properties	样本 Sample	直径 D/mm	拉断力 Tensile breaking force/N	抗拉强度 Tensile strength/ MPa
拉伸	1	9.44	26.11	0.67
Stretch	2	7.03	31.64	0.45
	3	7.89	16.43	0.34
	4	8.64	24.01	0.41
	5	8.88	33.77	0.55
	6	7.62	20.49	0.45
	平均值 $x -$	8.25	25.41	0.48
	方差σ	0.89	6.57	0.17
特性 Properties	样本 Sample	直径 D/mm	压断力 Compressive breaking force/N	抗压强度 Compressive strength/ MPa
挤压	1	8.62	236.2	0.53
Compression	2	8.84	159.4	0.37
	3	8.89	226.4	0.51
	4	9.38	295.6	0.63
	5	9.56	262.9	0.55
	6	11.23	348.1	0.62
	平均值 $x -$	9.42	254.77	0.54
	方差σ	0.95	64.33	0.09
特性 Properties	样本 Sample	直径 D/mm	最大弯曲力 Maximum bending force/N	弹性模量 Elastic modulus/ MPa
弯曲	1	23.38	28.1	0.12
Bending	2	26.85	31.2	0.13
	3	25.88	37.2	0.18
	4	24.39	40.0	0.21
	5	25.32	32.1	0.17
	6	23.93	27.3	0.14
	平均值 $x -$	24.96	32.65	0.16
	方差σ	1.30	5.02	0.03

Table 2 Experimental results of mechanical properties of scallion white

特性 Properties	样本 Sample	直径 D/mm	拉断力 Tensile breaking force/N	抗拉强度 Tensile strength/ MPa
拉伸	1	9.44	26.11	0.67
Stretch	2	7.03	31.64	0.45
	3	7.89	16.43	0.34
	4	8.64	24.01	0.41
	5	8.88	33.77	0.55
	6	7.62	20.49	0.45
	平均值 $x -$	8.25	25.41	0.48
	方差σ	0.89	6.57	0.17
特性 Properties	样本 Sample	直径 D/mm	压断力 Compressive breaking force/N	抗压强度 Compressive strength/ MPa
挤压	1	8.62	236.2	0.53
Compression	2	8.84	159.4	0.37
	3	8.89	226.4	0.51
	4	9.38	295.6	0.63
	5	9.56	262.9	0.55
	6	11.23	348.1	0.62
	平均值 $x -$	9.42	254.77	0.54
	方差σ	0.95	64.33	0.09
特性 Properties	样本 Sample	直径 D/mm	最大弯曲力 Maximum bending force/N	弹性模量 Elastic modulus/ MPa
弯曲	1	23.38	28.1	0.12
Bending	2	26.85	31.2	0.13
	3	25.88	37.2	0.18
	4	24.39	40.0	0.21
	5	25.32	32.1	0.17
	6	23.93	27.3	0.14
	平均值 $x -$	24.96	32.65	0.16
	方差σ	1.30	5.02	0.03

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Characterization of mechanical properties of scallion white under mechanical load damage

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