Strength and durability characteristics of ropes and cables from Kevlar&amp;amp;#174; aramid fibers

Horn, M.; Riewald, P.; Zweben, Carl

doi:10.1109/oceans.1977.1154444

Cited by 17 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This approach results in a mechanically simpler design for achieving constant force, compatible with a fully compressible device. Kevlar has a higher tensile strength than many steels (Horn et al, 1977;Proulx, 2011;Zhu et al, 2011) allowing it to withstand the high internal fluid pressures to prevent circumferential expansion while still allowing full axial compression. Due to these unique properties, the fabric shock absorber can be made to be much smaller in size and lighter in weight than existing rigid hydraulic shock absorbers.…”

Section: Discussionmentioning

confidence: 99%

Collapsible fluid-filled fabric shock absorber with constant force

Alizadeh

Fanton

Camarillo

2021

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

Energy absorption is an important challenge shared by multiple different industries including manufacturing, transportation, and protective equipment. This paper presents a novel shock absorption system based on woven fabrics designed to fully collapse and absorb energy at a near-minimum force level. The proposed system exerts an approximately constant force across different impact velocities. This system utilizes a fixed-orifice hydraulic shock absorber with variable contact area over its displacement to provide a nearly-constant force which scales with impact energy. Using analytical fluid dynamics, the contact area needed to produce a constant minimum force is derived. A finite element model of this shock absorber is created to validate the concept. Different impact conditions are simulated. The results confirm that the proposed fabric shock absorber is capable of producing a nearly-constant force across different impact energies. In simulation, the fabric shock absorber follows the ideal constant force profile with an averaged efficiency of 77.8% ± 3.4% which is far above standard foams which have efficiency of only approximately 20%–40%. The proposed system is compared with a cylindrical damper to show performance improvements gained through variable area geometry. Potential applications of this technology include soft devices for space-constrained applications such as contact sport helmets.

show abstract

Section: Discussionmentioning

confidence: 99%

Collapsible fluid-filled fabric shock absorber with constant force

Alizadeh

Fanton

Camarillo

2021

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

show abstract

“…According to Hawkins et al (1996), E-glass composite wraps applied as confinement to circular highway columns failed in 3 years under sustained stress around 32% of the manufacturer's reported strength. For Kevlar fibres, 100-year sustained strength is around 60% of short-term strength (Taerwe 1993;Horn et al 1977). Test data on carbon fibres show very few failures after several years and the sustained stress of 80% of the short-term ultimate value (Slattery 1994).…”

Section: Peculiarities Of Structural Application and Designmentioning

confidence: 99%

“…Tests on the aramid bar showed sustained to the short-term strength ratios of 75%, 70%, 60% and 50% for exposure to 20 °C air and 20 °C, 40 °C and 60 °C alkaline environments respectively (at 10,000 hours) (Scheibe, Rostasy 1995). The estimated 100-year sustained strength of an aramid rod decreased from 60% in air to 50% of short-term strength in an alkaline environment (Horn et al 1977;Gerritse 1992;Gerritse, Den Uijl 1995). Dolan et al (1997) found the longterm strength (at 5500 hours and for GFRP tendons embedded in concrete) of about 55% of the short-term value.…”

Section: Peculiarities Of Structural Application and Designmentioning

confidence: 99%

FRP Reinforcement for Concrete Structures: State-of-the-Art Review of Application and Design

Gudonis

Timinskas

Gribniak

et al. 2014

Engineering Structures and Technologies

View full text Add to dashboard Cite

Fiber reinforced polymers (FRPs) are considered to be a promising alternative to steel reinforcement, especially in concrete structures subjected to an aggressive environment or to the effects of electromagnetic fields. Although attempts to develop effective reinforcement have been followed, the application of FRPs remains limited by the solution to simple structural problems that mainly appear due to the absence of design codes, significant variation in the material properties of FRP composites and limited knowledge gained by engineers as regards the application aspects of FRP composites and structural mechanics of concrete elements reinforced with FRPs. To fill the latter gap, the current state-of-the-art report is dedicated to present recent achievements in FRPs applying practice to a broad engineers’ community. The report also revises the manufacturing process, material properties, the application area and design peculiarities of concrete elements reinforced with FRP composites. Along the focus on internal reinforcement, the paper overviews recent practices of applying FRP reinforced concrete (RC) elements in structural engineering. The review highlights the main problems restricting the application of FRPs in building industry and reveals the problematic issues (related to the material properties of the FRP) important for designing RC following the formulation of targets for further research.

show abstract

“…Minoshima et al (2000) (Horn et al, 1977). 12.26 Tensile strength loss as a function of the number of bending cycles for Kevlar fibres (Dobb et al, 1981).…”

Section: Fatiguementioning

confidence: 99%

“…In general, aramid fibres are exceptionally stable in several highly corrosive environments (Technical Datasheets; Horn et al, 1977;Bunsell, 1988). Table 12.2 briefly summarizes the environmental stability (evaluated as strength retention) of aramid fibres in contact with several chemicals.…”

Section: Chemicalsmentioning

confidence: 99%