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)

\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