PSI - Issue 64

Sizhe Wang et al. / Procedia Structural Integrity 64 (2024) 2075–2082 Author name / Structural Integrity Procedia 00 (2019) 000–000

2077

3

Steel plate

t=10

Fe-SMA strip

850

50 mm

Adhesive

A

A A’

A’

Steel plate

150

50

Fe-SMA t=1.5

d=5

7.5 1

Adhesive

Section A-A/A’-A’

Notch and precrack

(a)

(b)

(c)

Fig. 1. Steel plates repaired with bonded Fe-SMA patches on both sides. (a) Illustration of cracked steel plates. (b) Configurations of bonded Fe SMA patches. (c) Photos of two specimens. Unit: mm.

Generally, for the repair patches, a shorter length is desirable. However, the length should be designed considering the following aspects: (1) the bonded capacity, which is dependent on the bonded length; (2) the final Fe-SMA prestress level, which is affected by the activation and anchorage lengths (Li et al. (2024)); (3) the compressive stress distribution in the steel plates caused by Fe-SMA prestress, which is related to the activation length. Therefore, as an important parameter to be optimized, different lengths were investigated in this study. Table 1 summarizes the specimens.

(mm) 100

(mm) 50

(mm) 50

(℃) 180 180 180 180 180

Table 1 Specimen configuration. Specimen

A-50-a A-50-b A-100 A-150-a A-150-b A-250

100 200 300 300 500

50 50 50 50 50

50

100 150 150 250

180 As sown in Table 1, for all specimens, Fe-SMA strips had the same width of 50 mm and thickness of 1.5 mm (i.e., =50 mm and =1.5 mm), but the length varied from 100 to 500 mm. The middle part of the Fe-SMA (over the crack) was activated by a heating and cooling operation, whereas the two ends were working as anchorages