PSI - Issue 52

Minori Isozaki et al. / Procedia Structural Integrity 52 (2024) 176–186 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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4

Fig. 4. Displacement-Load Diagram (Compression shear test, Experiment).

Table 1. Failure Load / Apparent shear strength (Compression Shear Test, Experiment) Specimen No. Welding time ( s ) Failure load ( N )

Apparent shear strength ( MPa )

1 2 3 4

3 3 5 5

1340

28.4 22.9 45.1 44.6

652

4020 4780

The resulting displacement-load diagram is shown in Fig. 4. Table 1 shows the failure load, and the apparent shear strength calculated from the area of the weld zone obtained based on the X-ray CT (SHIMADZU Co.) image and the failure load. As shown in Fig. 4, the load decreased at a certain displacement, and at this point the welded part had reached failure. The shear strength calculated from the experimental results averaged 35.3 MPa.

2.2. Analysis

A finite element analysis of a compression shear test was performed using the general-purpose finite element analysis software Abaqus 2020. As shown in Fig. 5, the model consists of two CFRTP laminates of 30 mm square and a circular weld zone ( PEEK) between them. The diameter of the weld zone, α mm, was changed depending on the specimen based on the size of the weld zone observed by X-ray CT, assuming that the shape of the weld zone was a perfect circle (Table 2). The material properties assumed for the CFRTP, and the welded part are shown in Table 3 and Table 4, and since the welded part was resin, the metal plasticity property was inserted (Table 4). In this simulation, the compression shear test was reproduced by applying boundary conditions in the y-direction to the top and bottom surfaces of the CFRTP on one side and in the z-direction to both sides of the CFRTP, and y-direction displacement to the top surface of the CFRTP on the other side, which was not fixed in the y-direction (Fig. 5). This analysis was performed in a second-order analysis.