15. Dynamic Mechanical Properties of Scotch-Weld AF 31 Film Adhesive

The dynamic mechanical properties were obtained using a Maxwell rotating beam apparatus on Scotch-Weld

AF 31 film adhesive cured at 350°F (177°C) for 60 minutes under 100 psi pressure with a rise of 10°F per minute.

Storage Modulus

Loss Modulus

Complex Young’s Modulus

Structural Adhesive Film

AF 31

- 10 -

14. Effect of Radiation on 3M™ Scotch-Weld™ Structural Adhesive Film AF 31 Bonds

The effect of radiation was determined using a spent fuel source (Particle energy .75 MEV avg.) Dosage 1.0

megarads per hour on 1" wide 1/2" overlap shear specimens cut from 4" x 7" x .064" thick bonded 2024 T3

clad aluminum panels. Bonds were formed with a 350°F (177°C), 60 minutes, 150 psi, 200°F (93°C)/minute

temperature rise rate cure cycle. Radiation temperature was 75°F (24°C). Overlap shear tests were run per

MMM-A-132 Methods.

Product Performance

(continued)

Note: The following technical information and data should be considered representative

or typical only and should not be used for specification purposes.

Megarad

Overlap Shear (psi)

Dosage

-67°F (-55°C)

75°F (24°C)

300°F (149°C)

0

3500

4200

2390

100

3120

4200

1620

200

2950

4070

1500

300

2840

3910

1500

500

2340

3020

1500

700

1850

2180

1330

900

1400

1340

870

Tan

Frequency

Temperature

Cycles/minute

Tan

δδ

E*, psi

-67°F (-55°C)

1

498600

34000

.0682

499800

10

527100

28000

.0531

527800

100

557200

22850

.0410

557600

500

557200

19330

.0347

557500

3700

534400

26780

.0501

535100

77°F (25°C)

1

62660

6900

.1101

63040

10

72500

11050

.1524

73330

100

87670

17270

.1969

89350

500

103200

23150

.2244

105700

3700

104900

28110

.2679

108600

180°F (82°C)

1

34620

3340

.0964

34790

10

37950

2400

.0895

38100

100

42270

2890

.0684

42370

500

44000

3620

.0821

44190

3700

46800

4730

.1011

47030

300°F (149°C)

1

29390

2160

.0737

29470

10

31990

2745

.0858

32110

100

34360

3300

.0970

34520

500

36220

2920

.0805

36330

3700

37280

2820

.0756

37390

E* =