Rope and rope-like structures

Evans, J.J.; Ridge, I.M.L.

doi:10.2495/978-1-85312-941-4/07

Cited by 10 publications

(9 citation statements)

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“…Owing to the helical structure, both the Albert lay (+) and interactive lay (−) BC–Alg macrofibers would rotate under tensile loading, and the Albert lay (+) case is especially prone to this tendency according to the traditional theory for rope and rope-like materials [ 38 ]. During this rotation process, each helically distributed filaments in the macrofibers is gradually straightened before break, leading to elongation increase of the whole helical BC–Alg fibers.…”

Section: Resultsmentioning

confidence: 99%

“…5 d and Supplementary Table 2 ), certifying the validity of the bioinspired hierarchical helical and nanocomposite structural design proposed here. Additionally, it should be noted that though the designed bioinspired hierarchical helical macrofibers share some similarities in terms of helical hierarchy and performance characteristics with traditional rope materials [ 38 ], the benefits derived from the intrinsic merits of nanoscale building blocks and the superior nanocomposite structure are prominent.…”

Section: Resultsmentioning

confidence: 99%

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Bioinspired hierarchical helical nanocomposite macrofibers based on bacterial cellulose nanofibers

Gao¹,

Zhao²,

Cui³

et al. 2019

National Science Review

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Bio-sourced nanocellulosic materials are promising candidates for spinning high-performance sustainable macrofibers for advanced applications. Various strategies have been pursued to gain nanocellulose-based macrofibers with improved strength. However, nearly all of them have been achieved at the expense of their elongation and toughness. Inspired by the widely existed hierarchical helical and nanocomposite structural features in biosynthesized fibers exhibiting exceptional combinations of strength and toughness, we report a design strategy to make nanocellulose-based macrofibers with similar characteristics. By combining a facile wet-spinning process with a subsequent multiple wet-twisting procedure, we successfully obtain biomimetic hierarchical helical nanocomposite macrofibers based on bacterial cellulose nanofibers, realizing impressive improvement in their tensile strength, elongation and toughness simultaneously. The achievement certifies the validity of the bioinspired hierarchical helical and nanocomposite structural design proposed here. This bioinspired design strategy provides a potential platform for further optimizing or creating many more strong and tough nanocomposite fiber materials for diverse applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Bioinspired hierarchical helical nanocomposite macrofibers based on bacterial cellulose nanofibers

Gao¹,

Zhao²,

Cui³

et al. 2019

National Science Review

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“…In many aspects, plant searcher braids can be compared to cables or ropes, except that they typically do not have a core around which individual “wires” are wrapped (Evans et al, 2005 ; Costello, 2012 ). Based on observations of real intertwined searcher stems, the following boundary conditions were assumed to allow for an approximated calculation of the axial second moments of area of a structure consisting of n intertwined shoots: (1) All searcher stems are cylindrical with circular cross-sections, (2) the cross-sections of individual stems are the same for all stems and remain constant over the length of an intertwined structure, i.e., the stems have no taper, and cross-sectional area is given as A = n · π · r s 2 (to simplify comparability, radii are normalized to r si = r s = 1), (3) the centers of gravity of the n intertwined stems ( cg 1 , cg 2 , cg 3 , cg 4 ) are at the same constant distance from the centroid of the intertwined structure C , i.e., they are arranged on a circle with radius r p , and (4) intertwined stems do not overlap and are symmetrically arranged at angles φ i = 2π · i/n , with i = 1,2,3,4,… n , and (5) a searcher braid is treated as a unit in which individual stems are fixed with respect to each other.…”

Section: Tendrils and Intertwining Searchers In Climbing Plantsmentioning

confidence: 99%

Searching and Intertwining: Climbing Plants and GrowBots

et al. 2020

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Applications in remote inspection and medicine have motivated the recent development of innovative thin, flexible-backboned robots. However, such robots often experience difficulties in maintaining their intended posture under gravitational and other external loadings. Thin-stemmed climbing plants face many of the same problems. One highly effective solution adopted by such plants features the use of tendrils and tendril-like structures, or the intertwining of several individual stems to form braid-like structures. In this paper, we present new plant-inspired robotic tendril-bearing and intertwining stem hardware and corresponding novel attachment strategies for thin continuum robots. These contributions to robotics are motivated by new insights into plant tendril and intertwining mechanics and behavior. The practical applications of the resulting GrowBots is discussed in the context of space exploration and mining operations.

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“…In every braiding machine, there are two principal motions which are rotational and linear motions, where the rotating components make the braid structure, and the linear motion acts as a “take-up” process. The yarns' carriers motion in one track is clockwise and in the other one is counterclockwise with the (above-below) interactions causing the yarns to interlace at the point where the paths meet, which is the main mechanism for braid construction [7–10]. Braids can be formed using different patterns of yarns interlacing which have a major influence on their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the interaction between braiding structural parameters and their effects on ropes mechanical properties

Hamouda

Aly

Elshakankery

2020

Journal of Industrial Textiles

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Braided rope configuration and properties are the main key factors to consider on choosing it for various industrial applications. Rope's structure is characterized by high axial tensile strength combined with flexibility. The mechanical properties of ropes are greatly influenced by braiding process settings which have crucial effects on their functional performance. In this study, 27 types of braided polyester ropes were produced and divided into three groups according to their structural parameters and braiding settings, which include take-up and tension rates, yarn count, braid pattern, number of spindles and carriers' settings. The effects of changing these parameters on braid angle, repeat length, linear density, and mechanical properties such as tensile stress, strain and tensile modulus were investigated. Statistical analysis was conducted to evaluate the results using multiple regression analysis, F-test, surface and contour plots to illustrate the relation and the interaction between variables that have significant effects on the ropes' properties and to assess their performance. The results indicated that increasing the take-up rate leads to increase the ropes' braid angle. Whereas, increasing the tension leads to obtain ropes of low linear density with high stress and modulus. Ropes of lower strain were attained by increasing the take-up and decreasing the tension rates. Furthermore, the rope sample produced with pattern 2/2 using the high take-up and medium tension rate achieved the highest mechanical properties of high stress, modulus with low strain among all rope samples in the three groups.

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Rope and rope-like structures

Cited by 10 publications

References 1 publication

Bioinspired hierarchical helical nanocomposite macrofibers based on bacterial cellulose nanofibers

Bioinspired hierarchical helical nanocomposite macrofibers based on bacterial cellulose nanofibers

Searching and Intertwining: Climbing Plants and GrowBots

An experimental study on the interaction between braiding structural parameters and their effects on ropes mechanical properties

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