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$ \large stretch ~ \approx ~ { \Large { { \mu ( r_2 - r_1 ) } \over { V^2 r_2 r_1 } } ~ \approx ~ 9.64 km/s^2 \over V^2 } $ $ \large stretch ~ \approx ~ { \Large { { \mu ( r_2 - r_1 ) } \over { V^2 r_2 r_1 } } ~ \approx ~  { 9.64 km/s^2 \over V^2 } } $

Kevlar

(Kevlar is a trademark of DuPont)

kevlar.jpg

stephanie-kwolek.kevlar.jpg

Kevlar is a high strength aramid fiber invented by Stephanie Kwolek in the 1960s, and sold by DuPont since 1971

Kevlar 49 Properties

Kevlar in matrix, WAG

3

GPa

breaking strength

2

GPa

124

GPa

tensile modulus

82

GPa

1.44

g/cm3

density

1.5

g/cm3

2.08

MYuri

specific strength

1.3

MYuri

9.3

km/s

longitudinal speed

7

km/s

212

km

9.8 m/s² support length

130

km

3.6

%

max strain at break

2.4

%

strength/tensile

1.4

km/s

max transverse speed

110

$/kg

cost (old citation)

  • A 14 km/s loop increases speed by 69 m/s over a 100 km descent. That is a stretch of 0.49%, 20% of the strength/tensile ratio
  • A 12 km/s loop increases speed by 80 m/s over a 100 km descent. That is a stretch of 0.67%, 28% of the strength/tensile ratio

\large stretch ~ \approx ~ { \Large { { \mu ( r_2 - r_1 ) } \over { V^2 r_2 r_1 } } ~ \approx ~ { 9.64 km/s^2 \over V^2 } }

Kevlar Technical Guide downloaded from DuPont. Properties pdf page 9, thermal page 120

Kevlar (last edited 2017-05-27 01:06:35 by KeithLofstrom)