PSI - Issue 1

Salem Cherif Sadek et al. / Procedia Structural Integrity 1 (2016) 234–241 Salem cherif Sadek / StructuralIntegrity Procedia 00 (2016) 000 – 000

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Fig 3. Diagram of the plate have 2 stiffeners and a crack’s length (2a).

The ratios of the length of the cracks studied (2a / w) vary between 0 and 1, with a step of 0.05 and the angle of orientation θ of the crack with regard to the longitudinal axis of symmetry of the panel varies from 0° to 90 ° with a 10 ° angle increment.

8. Characteristics of the material

The structure studied is composed of mild steel whose mechanical characteristics are the Young's modulus (E = 205 800 MPa), Poisson's ratio (  = 0.3), density of the steel mass (  = 7.8 .103 kg / m3) and the shear modulus (G = 80000 MPa). 9. Linear buckling of the compression load panel Figure 4 presents the result of calculation by the finite element method of displacement for the case of cracked panel.

(b)

(a)

Fig 4. Modal displacement of the panel; (a) Longitudinal crack; (b) inclined crack with  =45  .

Iso-displacement shows Uz displacement a high in the central area between the stiffeners. Furthermore Uz is more important for the case of the longitudinal crack as the inclined crack. The results obtained for the four modes are shown in Figure5.