Issue 68

V. O. Alexenko et alii, Frattura ed Integrità Strutturale, 68 (2024) 390-409; DOI: 10.3221/IGF-ESIS.68.26

(a)

(b)

(c)

(d) (f) Figure 5: The CT micrographs obtained for the USW lap-joint formed at the PEI/CF-fabric ratio of 23/77 and the USW duration of 500 ms (e)

C OMPUTATIONAL EXPERIMENTS OF THE USW LAP - JOINTS WITH DIFFERENT ADHESION LEVELS

Statement of the computer simulation problem theoretical study of the effect of the interfacial adhesion level on the tensile strength of the USW lap-joints was carried out using the ‘ABAQUS 2019’ FEM-based software package (Dassault Systemes, France). Fig. 6 shows a scheme of the computational domain for 3D modeling of the USW lap-joints of two PEI adherends with dimensions of 45  20  2.2 mm and the contact area of 20  20 mm, similar to the experimental data described above. The model reproduced only part of the samples without the areas located in the clamps of the testing machine. Between the PEI adherends, there was a prepreg layer consisting of the CF-fabric impregnated with PEI. A

Figure 6: The scheme of the computational domain for 3D modeling of the USW lap-joints.

The following boundary conditions were accepted for the model: - the left end of the sample was rigidly fixed, so displacements in all directions were prohibited; - on the right end, movements in the direction of the Ox axis were specified step by step; displacements at the end along other axes were prohibited;

397