Issue 62

S.Ch.Djebbar et alii, Frattura ed Integrità Strutturale, 62 (2022) 304-325; DOI: 10.3221/IGF-ESIS.62.22

Figure 17: Variation of the maximum tensile force and maximum displacement according to the geometric parameter ‘a’ of the modification of the edges of the patch. The stress distribution in the repaired plate is ensured by the load transfer rate through the adhesive (Fig. 18b). The stress level is clearly raised so that if the height of the patch is reduced, a high stress concentration is located in the adhesive layer. The minimum patch size, and the presence of the notch causes a small area covered by the adhesive; this causes high values of stress distributed at the edges and notch. The representation of the maximum values of the tensile force and displacement of the repaired structure as a function of the variation of the parameter ‘R1’ is shown in Fig. 19. It is clearly noted that the variation is inversely proportional between the maximum force and the maximum displacement of the structure if the parameter ‘R1’ of the patch corner modification increases. The maximum force decreases and the elongation increases. For this change, it is noted that if the height ‘R1’ decreases the width of the patch ‘R2’ increases which ensures a wide coverage of the damaged area.

a)

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