Accident caused by dynamic overloading of a ship mooring rope

Valet, Sebastian; Piskoty, G.; Suéry, M.; Affolter, Christian; Beer, Morris De

doi:10.1016/j.engfailanal.2013.03.027

Cited by 8 publications

(2 citation statements)

References 2 publications

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“…In particular, lesser amounts of raw materials usually translate into lower factors of safety, in classical design, that increase the likelihood of failure arising under loading that is outside the range of safety [9]. Examples of failure due to overloading abound in various sectors such as railroad [21,22], aerospace [23], shipping [24] and medical [25], to name a few. Consequently, this effort focuses on failures due to overloading, while risks posed by nominal conditions through material defects, product geometry and other product-based factors [26] controlled by rigorous design in the factor of frugality approach by Rao [8,9].…”

Section: Methodology For Adaptationmentioning

confidence: 99%

On complex systems of adaptive frugal products

Rao

2020

R. Soc. open sci.

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Frugal products possess a proper mix of features including minimal consumption of resources, good functionality under nominal conditions and low cost. Therefore, increasing use of frugal products, that are designed and also fabricated systematically, is crucial to all-round sustainable development . However, their low factor-of-safety rigorous-design makes them inherently prone to failure under conditions of overloading. And multitudes of such coupled-products would create topologies of interconnected complex systems in the foreseeable future whose individual products should be made to adapt against any events of failure to enhance functionality while maintaining low cost. Accordingly, this paper proposes a two-pronged methodology for adaptation of frugal products along with ramifications of complex systems of frugal products. The adaptation methodology is crucial to the functioning of individual and also networks of frugal products and this work accordingly explicates scenarios of ensuing networks. Other than application to various sectors including electric vehicles , a basic example of which is covered in this paper, the proposed adaptation-and-networking framework can also be applied to a growing numbers of sustainable products, which are frugal according to the terminology of this effort and hence prone to premature failure.

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Section: Methodology For Adaptationmentioning

confidence: 99%

On complex systems of adaptive frugal products

Rao

2020

R. Soc. open sci.

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“…In order to clear whether the rope could have been overloaded by the inertial force of the backwards rolling carriage, the energy balance approach [14,15] was used. By sudden stretching of the slacked rope, the kinetic energy of the backwards rolled carriage E c was converted primarily into elastic energy of the winch rope (E w ) and of track rope (E T ).…”

Section: Estimation Of the Critical Roll Back Speedmentioning

confidence: 99%

Failure analysis of a ropeway accident focussing on the wire rope's fracture load under lateral pressure

Piskoty

Affolter

Sauder

et al. 2017

Engineering Failure Analysis

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The bi-cable reversible aerial ropeway had been built as a winch system exclusively for goods transport. During upwards transport the winch was brusquely stopped by the operator. This caused the winch rope to slack and eventually to fracture at the moment of the jerky stretching by the backward rolling carriage. The brakeless carriage sped downhill along the track rope and finally crashed into the lower station leading to the unfortunate death of the farmer sitting unlawfully in the carriage. The steel wire rope (6 mm, type 6 x 7-FC) showed no indication of the typical failure mechanism of moving ropes, i.e. fretting fatigue. The single wires were broken in almost the same cross section showing a mixture of conical and shear fractures. This unusual fracture pattern could have been either the consequence of a local pre-damage or of an excessive lateral pressure and bending at the cross point of two windings on the winch. The latter alternative was evaluated by a test setup, allowing continuous increase of the deflection angle  until fracture of the rope. Highlights The failure analysis of a fatal ropeway accident is presented. The failure mechanism of the winch rope was not typical: fast fracture but not fretting fatigue. The residual fracture load of the wire rope under lateral pressure due to sharp bending was quantified experimentally. For the investigated rope type, the deflection angle in degree and the resulting load capacity reduction in percentage are roughly equal numerically.

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Safety Study on Load-Limiting Device for Rope Rescue

Chang

Chen

et al. 2020

The Proceedings of 11th Asia-Oceania Symposium on Fire Science and Technology

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Accident caused by dynamic overloading of a ship mooring rope

Cited by 8 publications

References 2 publications

On complex systems of adaptive frugal products

On complex systems of adaptive frugal products

Failure analysis of a ropeway accident focussing on the wire rope's fracture load under lateral pressure

Safety Study on Load-Limiting Device for Rope Rescue

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