Fatigue Testing: Rotating BendType of assignment

Test

Applied mass (kg)

RPM

Cycles to failure

Notes

1

4.5

4,000*

109,286

Initial rpm 3000 for 38913 cycles. RPM increased to 6000 for 70373 cycles

2

6.0

750*

7,461

Initial rpm 600 for 382 cycles, increased to 750rpm for 7079 cycles

Applied mass (kg)

RPM

Cycles to failure

1

3

3,000

16,773

Two surface scratches visible before test

2

3

5000*

39,572

38,670 @3000rpm

followed by 902 cycles @5000rpm

Applied mass (kg)

RPM

Cycles to failure

1

4

1000*

2,973

572 cycles @ 600rpm, followed by 2401 cycles @ 1000rpm

2

3.5

1500*

43,422**

**NO FAIL (possible problem with Air Cushion?)

80 @ 600rpm,

followed by 43,342 cycles @ 1500rpm

3

4.5

750*

12,953**

**NO FAIL (possible problem with Air Cushion?)

1,183 @ 600rpm

5059 @ 450rpm

6,712 @ 750rpm

4

3

6000

119,457*

99,971 @ 6000rpm

183 @ 600rpm

19,303 @ 6000rpm

Applied mass (kg)

RPM

Cycles to failure

Notes

Supplied

3.2

6,000

1,002,457

Supplied

4.5

6,000

209531

Supplied

4.5

6,000

150,780*

Test stopped – no failure

Supplied

5.6

1,500

22,846

Supplied

6.3

500

9,256

Supplied

5.9

1,000

15,486

Supplied

5.3

3,100*

34,828

Initial rpm of 4000 for first 20,297 cycles. RPM then reduced to 3100 due to specimen heating.

Applied mass (kg)

RPM

Cycles to failure

Supplied

2.0

6,000

643,736

Supplied

2.7

4,000

69,723

Supplied

3.1

4,000

19,985

Supplied

3.2

2,000

14,175

Supplied

3.5

1,000

7,034

Supplied

2.5

6,000

146,521

Applied mass (kg)

RPM

Cycles to failure

Supplied

3.8

1,000

5,572

Supplied

3.6

2,000

8,654

Supplied

3.5

3,000

28,062

Supplied

3.2

4,000

63,494

Supplied

3.0

6,000

94,935