1) Kevlar fibers have the highest specific modulus and the lowest specific strength compared to other fibers.

True or False

2) If an application requires low weight and very high stiffness fibers, the best choice would be HM graphite.

True or False

3) if an application requires low weight and very high strength fibers, the best choice would be S glass.

True or False

4) If an application requires fibers with low weight, high stiffness, and high strength, the best option would be HT graphite.

True or False

5) According to Figure a, HM graphite fibers have the highest resistance to elastic deformation.

True or False

6) According to Figure a, Nomex fibers have the highest modulus of elasticity among all the fibers.

True or False

7) The strongest fiber is the resin-impregnated Kevlar strands

True or False

8) The most ductile fiber in the E-glass roving

True or False

9) The two fibers that require the highest energy to cause failure are resin-impregnated kevlar and S-glass fibers.

True or False

10) The toughest fiber is Nomex

True or False

Transcribed Image Text:

4137 (600) Resin-impregnated strands (ASTM D-2343-67) 3447 (500) S-glass roving Boron fiber Type HT graphite Roving of Kevlar 49 Type HM 2758 graphite (400) dry yarn (twist added) yarn yarn 2068 (300) E-glass roving 1379 (200) ET 689 (100) Nomex Tensile strain (%) Kevlar 49 resin-impregnated stränds S glass HT graphite (high tensile) Boron Other organics HM graphite (high modulus) •E glass • Steel • Aluminum 0. 3. 4 Tensile modulus Specific tensile modulus (10 in. = - density Tensile stress (MPa [ksi]) E 414 GPa E,= 379 GPa E,=262 GPa density E,=131 GPa Specific tensile strength (106 in. = ITensile strength E,= 82.7 GPa = 68.9 GPa 4137 (600) Resin-impregnated strands (ASTM D-2343-67) 3447 (500) S-glass roving Boron fiber Type HT graphite Roving of Kevlar 49 Type HM 2758 graphite (400) dry yarn (twist added) yarn yarn 2068 (300) E-glass roving 1379 (200) ET 689 (100) Nomex Tensile strain (%) Kevlar 49 resin-impregnated stränds S glass HT graphite (high tensile) Boron Other organics HM graphite (high modulus) •E glass • Steel • Aluminum 0. 3. 4 Tensile modulus Specific tensile modulus (10 in. = - density Tensile stress (MPa [ksi]) E 414 GPa E,= 379 GPa E,=262 GPa density E,=131 GPa Specific tensile strength (106 in. = ITensile strength E,= 82.7 GPa = 68.9 GPa

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