绳结涡旋对绳索抗拉性能的影响

王哲; 赵海涛; 刘扬; 陈吉安

doi:10.13433/j.cnki.1003-8728.20220222

绳结涡旋对绳索抗拉性能的影响

doi: 10.13433/j.cnki.1003-8728.20220222

王哲^{1, 2,},
赵海涛^1, ,,
刘扬¹,
陈吉安¹

1.
上海交通大学航空航天学院，上海　200240
2.
上海航天技术研究院上海宇航系统工程研究所, 上海　201109

详细信息

作者简介:
王哲，硕士，1109213662@qq.com

通讯作者:
赵海涛，副研究员，硕士生导师，博士，zht@sjtu.edu.cn

中图分类号: V254.1
计量
- 文章访问数: 32
- HTML全文浏览量: 8
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2021-12-15
- 刊出日期: 2024-03-25

Effects of Rope's Knot Vortex on Tensile Properties

WANG Zhe^{1, 2
,},
ZHAO Haitao^{1
, ,},
LIU Yang¹,
CHEN Ji'an¹

1.
School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China
2.
Shanghai Institute of Aerospace System Engineering, Shanghai Academy of Spaceflight Technology, Shanghai 201109, China

摘要

摘要: PBO绳索具有优良的性能，被广泛应用于航空、航天等诸多领域。本文以PBO绳索的绳结为研究对象，通过打结绳索和未打结绳索拉伸实验对比，发现绳索打结极大地降低了绳索的抗拉性能。为了深入探究打结使绳索抗拉性能降低的原因，利用 UG软件建立了绳结模型，从绳结涡旋和等效长度的角度进行研究。经过对多种绳结的拉伸实验研究，提出了一种评估打结对绳索抗拉性能影响的方法，并用实验验证。结果表明：该评估方法能根据绳结等效长度和涡旋总边数的比值，实现对绳结的抗拉性能评估；为新绳结的设计及评估提供参考。
- PBO绳索 /
- 绳结 /
- 涡旋 /
- 抗拉性能
Abstract: A poly-p-phenylene benzobisoxazole(PBO) rope has excellent properties and is widely used in aerospace and many other fields. This paper studies rope knots through comparing tensile experimental results between knotted and non-knotted ropes. It is found that the knotted rope greatly reduces its tensile properties. In order to deeply explore the reasons why knotting reduces the tensile properties of a rope, the knot model is established by using the UG software to study its knot vortex and equivalent length, Through the experimental study of tensile properties of various knots, a method for evaluating the effects of the rope's knot vortex on the tensile properties is proposed. The experimental results show that the evaluation method can evaluate the tensile properties of knots according to the ratio of the equivalent length of knots to the total number of vortex sides.
- PBO rope /
- knot /
- vortex /
- tensile properties

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图 1 绳索直径示意图

Figure 1. Diameter of a rope

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图 2 各绳结照片

Figure 2. Various rope knots

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图 3 SUNS 单轴拉伸试验机及缠绕式夹具

Figure 3. SUNS single-axial tensile experiment device

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图 4 高速摄像机记录的各绳结断裂结果

Figure 4. Rope knot breakage results recorded by high-speed video camera

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图 5 绳结拉伸实验结果

Figure 5. Knot tensile test results

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图 6 金钱结的拉伸实验过程

Figure 6. Tensile experimental process of the money knot

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图 7 各绳结模型

Figure 7. Models of each knot

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图 8 金钱结涡旋示意图

Figure 8. Schematic diagram of the money knot vortex

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图 9 绳结两端受拉力示意图

Figure 9. Schematic diagram of tension at both ends of knot

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图 10 各绳结涡旋示意图

Figure 10. Schematic diagram of each knot vortex

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图 11 两种金钱结模型

Figure 11. Two golden rope knot models

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表 1 各绳结的等效长度

Table 1. Equivolent lengths of various rope knots

绳结名称	试件1/cm	试件2/cm	试件3/cm	平均值/cm
金钱结	11.3	11.8	11.5	11.6
渔夫结	9.3	8.9	8.8	9.0
外科结	11.2	11.7	11.1	11.5
飞艇结	8.1	8.0	8.5	8.2

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表 2 绳结能承受的最大拉力实验结果

Table 2. Maximum tensile forces bearable by rope knots

绳结	试件1/N	试件2/N	试件3/N	平均值/N
金钱结	2258.691	2114.371	2341.778	2238.280
渔夫结	2368.938	2553.820	2309.195	2410.651
外科结	2626.439	2685.010	2562.121	2624.523
飞艇结	2898.886	3359.665	3047.910	3102.154

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表 3 绳索的拉伸实验结果

Table 3. Tensile forces of rope knots

参数	最大拉力/N
试件1	16582.616
试件2	16014.682
试件3	16722.191
平均值	16439.833

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表 4 各绳结涡旋评估结果

Table 4. Evaluating vortices of rope knots

绳结	总涡旋数n	总边数N	L/N	最大拉力平均值/N
金钱结	1	4	2.90	2238.280
渔夫结	2	10	0.90	2410.651
外科结	8	16	0.72	2624.523
飞艇结	5	14	0.59	3102.154

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表 5 两种金钱结的拉伸实验结果

Table 5. Tensile results of two types of money knots

参数	α-金钱结	β-金钱结
试件1/N	2258.691	2213.083
试件2/N	2114.371	2378.942
试件3/N	2341.778	2462.551
平均值/N	2238.280	2351.525

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表 6 两种金钱结的评估

Table 6. Evaluating two golden rope knots

参数	α-金钱结	β-金钱结
总涡旋数n	1	2
总边数N	4	6
等效长度L/cm	11.6	11.6
L/N	2.90	1.90
最大拉力平均值/N	2238.280	2351.525

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