Exploratory parachute canopy stress measurements during inflation and at steady state

Heinrich, Helmut G.; Saari, D. P.

doi:10.2514/6.1975-1374

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…Traditional sensors (strain gauges, temperature probes…) are neither flexible, nor compatible with deformations of textile fibres and fabrics, even if in some cases, they can be used on flexible structures with specific mounting schemes. For instance, in the late seventies, Heinrich used the “Omega structure” to evaluate deformations of a parachute canopy in a wind tunnel [ 1 , 2 ]. More recent developments in sensing adapted to textile structures consisted in integrating metallic yarns (stainless steel mainly) or optical fibres (Fibre Bragg Grating principle) [ 3 – 5 ].…”

Section: Introductionmentioning

confidence: 99%

A Flexible Strain Sensor Based on a Conductive Polymer Composite for in situ Measurement of Parachute Canopy Deformation

Cochrane

Lewandowski

Končar

2010

Sensors

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A sensor based on a Conductive Polymer Composite (CPC), fully compatible with a textile substrate and its general properties, has been developed in our laboratory, and its electromechanical characterization is presented herein. In particular the effects of strain rate (from 10 to 1,000 mm/min) and of repeated elongation cycles on the sensor behaviour are investigated. The results show that strain rate seems to have little influence on sensor response. When submitted to repeated tensile cycles, the CPC sensor is able to detect accurately fabric deformations over each whole cycle, taking into account the mechanical behaviour of the textile substrate. Complementary information is given concerning the non-effect of aging on the global resistivity of the CPC sensor. Finally, our sensor was tested on a parachute canopy during a real drop test: the canopy fabric deformation during the critical inflation phase was successfully measured, and was found to be less than 9%.

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Section: Introductionmentioning

confidence: 99%