3.4 Consider the panel loaded as shown below, which has a central crack 2 inches in

length oriented perpendicular to the applied load. The materials listed below are being

considered for this application.

Material

7075-T651

7055-&7751

2024-T351

2324-T39

Ti-6-4

4340M

400 in

crock

Static strength,

FTY (ksi)

69

86

48

62

120

226

50 in

Fracture toughness,

Kapp (ksi-in¹¹)

67

85

141

142

150

100

What is the lightest adequate panel to survive the load if:

a. only static strength is considered?

b. fracture toughness is considered?

c. both criteria are considered?

500,000 lb

Density,

p (lb/in³)

.101

.102

.101

.101

.160

.283