Experimental Investigation of Stresses in Winch Drums Subjected to Multilayer Spooling Loads From Synthetic Fibre Ropes

2019 ◽  
Author(s):  
Reidar André Skarbøvik ◽  
Henry Piehl ◽  
Sverre Torben ◽  
Mette Lokna Nedreberg ◽  
Vilmar Æsøy
Keyword(s):  
Experimental Investigation ◽  
High Performance ◽  
Synthetic Fibre ◽  
Steel Wire ◽  
High Strength ◽  
Wire Rope ◽  
First Results ◽  
Large Water ◽  
Marine Applications ◽  
And Control

Abstract In many marine applications, modern high-performance synthetic fibre ropes have replaced, and are continuing to replace, well-known steel wire rope solutions due to the low weight of the synthetic ropes removing limitations for operations at large water depths. In some cases, replacement of steel wires with synthetic ropes has caused permanent deformations and damage to multilayer winch drums, indicating that synthetic fibre ropes can cause larger pressure on winch drums than steel wire. This paper presents the first results from a novel experimental investigation of a multilayer winch subjected to a selection of braided high-performance synthetic fibre ropes and a reference steel wire rope. The tested ropes, with nominal diameters between 12 and 20mm, are spooled at different tensile loads and with maximum number of layers in the range of 10 to 19. The experiments utilize a test rig with two winch drums, controllable spooling gear and sheaves with load cells to apply and control required load and speed during spooling. Measurements from twelve biaxial strain gauges on the inside of a thick high-strength drum are used to measure stresses in the structure. The results show that the selected fibre ropes induce considerably larger stress in the winch drum than the steel wire rope. This confirms that design of multilayer winch drums with high-performance synthetic fibre ropes requires special considerations and that the guidance for multilayer stress calculations, related to steel wire ropes, in DNV-GL-0378 “Standard for offshore and platform lifting appliances” is not applicable for synthetic fibre rope applications.

Dynamic Attenuation and Compressive Characterization of Syntactic Foams

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Bhaskar Ale ◽  
Carl-Ernst Rousseau
Keyword(s):  
High Performance ◽  
Volume Fraction ◽  
Ultrasonic Attenuation ◽  
Dynamic Properties ◽  
High Strength ◽  
Particulate Composites ◽  
Syntactic Foams ◽  
Core Elements ◽  
Marine Applications ◽  
Damping Materials

Hollow particulate composites are lightweight, have high compressive strength, are low moisture absorbent, have high damping materials, and are used extensively in aerospace, marine applications, and in the manufacture of sandwich composites core elements. The high performance of these materials is achieved by adding high strength hollow glass particulates (microballoons) to an epoxy matrix, forming epoxy-syntactic foams. The present study focuses on the effect of volume fraction and microballoon size on the ultrasonic and dynamic properties of Epoxy Syntactic Foams. Ultrasonic attenuation coefficient from an experiment is compared with a previously developed theoretical model for low volume fractions that takes into account attenuation loss due to scattering and absorption. The guidelines of ASTM Standard E 664-93 are used to compute the apparent attenuation. Quasi-static compressive tests were also conducted to fully characterize the material. Both quasi-static and dynamic properties, as well as coefficients of attenuation and ultrasonic velocities are found to be strongly dependent upon the volume fraction and size of the microballoons.

Thermoplastic Elastomer Compounds from Sulfonated EPDM Ionomers

1988 ◽  
Vol 61 (2) ◽  
pp. 223-237 ◽  
Author(s):  
A. U. Paeglis ◽  
F. X. O'Shea
Keyword(s):  
High Performance ◽  
High Strength ◽  
Thermoplastic Elastomer ◽  
Cost Effective ◽  
Thermoplastic Elastomers ◽  
Hot Air ◽  
Low Temperature Flexibility ◽  
High Performance Application ◽  
And Control ◽  
Thermal Reversibility

Abstract The zinc sulfonate of EPDM, an ionic elastomer polymer, can be readily formulated into useful thermoplastic elastomer compounds having beneficial properties and processing characteristics. The thermoplastic processing characteristics of these ionic elastomers are uniquely controlled by “ionolyzers,” preferential ionic plasticizers. These additives induce thermal reversibility in the ionic crosslink and control the response of the ionic associations to temperature. Ionic elastomer compounds maintain many of the performance features characteristic of vulcanized EPDM, such as low-temperature flexibility, thermal stability, and weatherability, while providing the added advantages of heat weldability and elimination of vulcanization. We have developed a cost-effective ionic elastomer formulation that meets or exceeds the RMA recommendations for black EPDM in a demanding, high performance application, single-ply roofing membrane. High-strength lap seams can be rapidly fabricated using portable hot air welders, a technique unavailable to conventional vulcanized EPDM sheet. Other applications have been investigated for these polymers, such as hose, footwear, mechanical goods, adhesives, impact modifiers, and asphalt modifiers both as thermoplastic elastomers and as modifiers for other materials. These applications have taken advantage of the unique rheological and solubility properties of these polymers. In addition, a new polymer grade offers an advance in the ability to formulate higher strength and more highly filled and extended ionic elastomer compositions.

scholarly journals Hyperelastic modelling of yarn structures for dynamic applications

2018 ◽  
Vol 183 ◽  
pp. 01031
Author(s):  
Pietro del Sorbo ◽  
Jeremie Girardot ◽  
Frederic Dau ◽  
Ivan Iordanoff
Keyword(s):  
High Performance ◽  
Three Dimensional ◽  
Weight Ratio ◽  
High Strength ◽  
Material Model ◽  
Linear Elastic ◽  
Mesoscopic Models ◽  
First Results ◽  
Hyperelastic Model ◽  
The Impact

Dry fabrics comprised of high performance polymeric fibers have been widely used as protection layers in structures submitted to high velocity impacts (HVI). Their outstanding impact energy dissipation ability combined with an high strength-to-weight ratio make them a preferable choice in different applications such as bullet vests or blade containment systems over standard materials. Among the different approaches adopted to study these structures numerical methods assume a central role. Thanks to their reduced costs and the related possibility of evaluating the effects of single phenomena, they are often used to predict the structure ballistic limits or to study the physical events which occur during the penetration. Among the different strategies adopted to model a fabric, mesoscopic models have been largely adopted by different authors. These models assume the yarns as a continuum body while the fabric geometry is explicitly described. Nowadays yarn material models are universally assumed to be linear elastic and orthotropic. This modelling approach mostly focuses on the longitudinal behaviour of the yarn, however fiber-scale analyses and experimental results shows the importance of three-dimensional stress state on the ballistic limit. In order to obtain a three-dimensional description of the yarn strain state during the impact, a novel hyperelastic model for yarn structures here is developed. In a first step, fiber-level preliminary analyses have been performed to obtain the effective behaviour of these structure under the projectile collision. In the second step, the hyperelastic model has been implemented and identified thanks to microscopic elementary tests. Finally, a continuum model of the yarn have been performed. First results show the relevance of the hyperelastic model compared to the fiber-level observation and enhance the limit of the classical linear elastic material model.

The Progress and Prospects of the Research on Reinforcing RC Column with High Strength Steel Wire Mesh and High-Performance Mortar

2014 ◽  
Vol 488-489 ◽  
pp. 809-812
Author(s):  
Jia Qi Wang ◽  
Min Duan ◽  
Ping Shi Li
Keyword(s):  
High Performance ◽  
Steel Wire ◽  
High Strength ◽  
Wire Mesh ◽  
Rc Column ◽  
Project Study ◽  
Beam Shear ◽  
Stainless Steel Wire Mesh ◽  
Steel Wire Mesh ◽  
Shear Bending

The high strength stainless steel wire mesh and high-performance mortar reinforcement has been gradually applied in construction, bridge reinforcement project. Study of the reinforcement at home and abroad mainly focus on research of strengthening RC beam shear, bending, and seismic performance. Although the application of RC column has already been carried out, there is also a short of basic technical an applied research for further study. After looking through a large amount of references, this article gives a summary of the present study about reinforcing RC column with the reinforcement, draws some conclusions and predicts the prospect of development.

Analysis and Control on Winch Rope-Aligning Motion of Well Testing Truck

2012 ◽  
Vol 542-543 ◽  
pp. 822-827
Author(s):  
Yang Yang ◽  
Yun Chang Xiong ◽  
Rong Qing Yang
Keyword(s):  
Motion Analysis ◽  
Outer Layer ◽  
Steel Wire ◽  
Wire Rope ◽  
Well Testing ◽  
Safe Operation ◽  
Automatic Compensation ◽  
Automatic Tracking ◽  
Stable Performance ◽  
And Control

On basis of the rope- aligning motion analysis of the winch drum, this paper indicates the reason of the misalignment in the outer layer and edge of the drum by the current rope- aligning scheme, puts forward the rope- aligning scheme of the position following control on the rope- aligning device, and accordingly designs an automatic rope- aligning system. It is proved from the practice that the system is safe and reliable with the automatic tracking, automatic compensation, neat alignment of the steel wire rope, and stable performance, which provides the favorable guarantee for the safe operation of the winch.

scholarly journals Tensile Behavior of High-Strength Stainless Steel Wire Rope (HSSSWR)-Reinforced ECC

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Xinling Wang ◽  
Guanghua Yang ◽  
Wenwen Qian ◽  
Ke Li ◽  
Juntao Zhu
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Crack Width ◽  
Steel Wire ◽  
High Strength ◽  
Wire Rope ◽  
Stainless Steel Wire ◽  
Deformation Capacity ◽  
Test Results ◽  
Cracking Resistance

AbstractEngineered cementitious composites (ECC) show the distinguished characteristics of high post-cracking resistance and ductility. High-strength stainless steel wire rope (HSSSWR) has been successfully used for restoring or strengthening of existing structures. By combining the advantages of these two materials, a new composite system formed by embedding HSSSWR into ECC was proposed and expected to be a promising engineering material for repair or strengthening of structures. To investigate the tensile failure mechanism and mechanical properties of HSSSWR-reinforced ECC, an experimental study on 27 HSSSWR-reinforced ECC plates was conducted considering the effects of the reinforcement ratio of longitudinal HSSSWRs, formula of ECC and width of the plate. Test results revealed that HSSSWR-reinforced ECC exhibit superior post-cracking resistance, deformation capacity and crack-width control capacity. Increasing the reinforcement ratio of longitudinal HSSSWRs can effectively enhance the tensile strength, crack-width control capacity, deformation capacity and tensile toughness of HSSSWR-reinforced ECC. Adding thickener in ECC can significantly improve the crack-width control capacity and deformation capacity of HSSSWR-reinforced ECC due to enhancing uniform distribution of polyvinyl alcohol fibers, but would slightly reduce the cracking stress and maximum tensile stress by bringing small bubbles in the matrix. The tensile properties of HSSSWR-reinforced ECC plates are almost not affected by varying the plate width. Besides, a tensile constitutive model was developed for charactering the stress–strain relationship of HSSSWR-reinforced ECC in tension. Based on mechanical theories and failure characteristics of HSSSWR-reinforced ECC, the model parameters were determined, and calculation equations of cracking stress and tensile strength were proposed. The accuracy of the developed model and calculation equations was verified by test results.

scholarly journals Experimental Investigation of Self-Compacting Concrete Containing Coir Fibres

2021 ◽  
Vol 31 (2) ◽  
pp. 163-177
Author(s):  
Muhammad Tarique Lakhiar ◽  
Muhammad Tahir Lakhiar ◽  
Abd Halid Abdullah ◽  
Noridah Mohamad
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Tensile Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
Construction Materials ◽  
High Strength ◽  
Self Compacting Concrete ◽  
Slump Flow ◽  
Alternative Sources

Abstract Many researchers have investigated alternative sources to overcome the problem of conventional building material polluting the environment by the development of green self-compacting concrete in the construction industry. The best alternative solution is to utilise non-conventional construction materials like agricultural wastes. Meanwhile, self-compacting concrete (SCC) is considered as high strength as well as high-performance concrete. The demerits, which include tensile and flexural strength, can be improved by incorporating coir fibres. The utilisation of coir fibres also modifies self-compacting concrete performance after cracking and improves the toughness. This study defines an experimental investigation of the mechanical properties of self-compacting concrete containing coir fibres (CF) with different percentages being 0%, 0.2%, 0.5%, 1%, and 1.5% at 7- and 28-days water curing. The mechanical properties include the slump flow and compressive and tensile strength were examined. The outcomes demonstrated that a required slump flow for self-compacting concrete was achieved using coir fibres up to 1%, beyond which it reduced the slump significantly. The length of fibre and proportion of fibres directly affected the workability. The compressive strength was 10% to 15% enhanced with the incorporation of coir fibres up to 0.5%; after that, the strength was slightly reduced, and tensile strength was 30% to 50% improved compared to conventional self-compacting concrete up to 1% of coir fibres incorporation in the SCC mix, after which it rapidly reduced.

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