PSI - Issue 50

3

Lobanov Dmitriy S. et al./ Structural Integrity Procedia 00 (2022) 000 – 000

S. Lobanov Dmitriy et al. / Procedia Structural Integrity 50 (2023) 163–169

165

Table 1. Temperature aging modes and number of samples 15 days 30 days

45 days

22 °С

60 °С

90 °С

22 °С

60 °С

90 °С

22 °С

60 °С

90 °С

Machine oil Sea water Process water

3 samples for testing

The tests were carried out with the recommendations of the ASTM D2344 on the Instron 5982 electromechanical testing system. The span length was 30 mm. Loading speed 1 mm/min. The dimensions of the short beam specimens were 36x10x5mm. Acoustic emission (AE) signals were recorded using a Vallen AMSY-6 system (Germany). Broadband piezoelectric sensors M31 (Fujicera, Japan) with a frequency range of 300 – 800 kHz and a preamplifier (gain 34 dB) were used. The data sampling frequency was 10 MHz. The threshold value for recording AE signals was 40 dB. A photograph of the experimental study and a sample in the grips of the test system with the AE sensor are shown in Figure 1. а b

Fig. 1. (a) Instron 5982 test system and Vallen AMSY-6 AE signal acquisition system; (b) a sample of glass fiber reinforcement polymer in a tooling for interlaminar shear strength testing with an AE sensor. 3. Results and discussions 3.1. Results of mechanical tests The results of mechanical testing of fiberglass samples STEF at elevated temperatures are shown in Figure 2. According to the results of tests for interlaminar shear strength at elevated temperatures of 22 º, 70 º, 90 º and 120 º С , can be noted that a monotonous decrease in the strength values during interlaminar shear test by 18%, 69% and 90% depending on the temperature increase.