PSI - Issue 6

22 Nadezhda Ostrovskaya et al. / Procedia Structural Integrity 6 (2017) 19–26 Nadezhda Ostrovskaya, Yury Rutman / StructuralIntegrity Procedia 00 (2017) 000 – 000   f(x,x) P x,x m    - force of plastic damper resistance reduced to unit mass, it is characterized by the following parameters: 0 f P m T T  , 1 0 1 c m   , 2 0 2 c m   ,   P x,x  - bilinear force characteristic of a plastic damper (Fig. 4). 4

Fig. 4. Force characteristic of plastic damper and its bilinear approximation .

Parameters of power characteristics T f , 1  , 2  can be received in two ways: numerically by means of a terminating ultimate analysis in programs (for example, ANSIS) or analytically. Results of ANSIS numerical analysis are presented in the Fig. 5 and in the Table 1.

Fig. 5. (a) finite element model of a core; (b) strained state of a core.

Table 1. Parameters of PD power characteristics. Option 1

Operation effort 1 core Operation effort 1 support T p T P kN kN I II III I II

50  R mm 25  l mm

III

d

20

30

40

quantity

L

mm

mm 12.0

mm 36.0 25.0 21.0

4

8

12 48 30 18

4

8

12

4

8

12

150 200 250

mm mm mm

4.0 2.5 1.5

16 10

32 20 12

48 36 28

96 144 144 288 432 72 108 100 200 300

9.0 7.0

6

56

84

84 168 252