PSI - Issue 64

Mingyang Xi et al. / Procedia Structural Integrity 64 (2024) 515–522

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Mingyang Xi et al. / Structural Integrity Procedia 00 (2024)

000 – 000 this application (sequentially numbered S-1 to S-5) are shown in Table 1.

Table 1. Calibration Data Record of Self-sensing strands Check point / MPa Display reading / kN

Self-sensing strands wavelength (  ) / nm

S-1

S-2

S-3

S-4

S-5

0

0

1530.261 1531.923 1533.833 1535.870 1538.175 1539.728

1529.982 1531.679 1533.685 1535.786 1538.094 1539.847

1529.693 1531.335 1533.395 1535.437 1537.754 1539.217

1539.543 1541.580 1543.546 1545.619 1547.905 1549.360

1529.486 1531.132 1533.177 1535.290 1537.506 1539.011

10 20 30 40 45

44.1 86.6

131.4 182.5 205.5

Table 2. Self-sensing Strand Loading Wave-Force Variable Loading force ( F ) / kN

Self-sensing strands wavelength variable (   ) / pm

S-1

S-2

S-3

S-4

S-5

0

0

0

0

0

0

44.1 86.6

1662 3572 5609 7914 9467

1697 3703 5804 8112 9865

1642 3702 5744 8061 9524

2037 4003 6076 8362 9817

1646 3691 5804 8020 9525

131.4 182.5 205.5

Fig. 5. Wave-Force Conversion Fitting Curve

Table 3. Relationship Between Wave-Force Conversion of Self-sensing strands Self-sensing strand Wave-Force conversion relationship Self-sensing strand

Wave-Force conversion relationship

0.0226 F  =  0.0218 F  = 

0.0213 F  =  0.0223 F  = 

S-1 S-2 S-3

S-4 S-5

0.0223 F  =  Using the verification point at 0 MPa as the initial grating wavelength, the wavelength variables of each self sensing strand at different calibration points can be calculated from Table.1 (the wavelength variables see Table. 2). According to the relationship formula between force value and wavelength change specified by equation (1), the wave-