PSI - Issue 14

Premkumar Manda et al. / Procedia Structural Integrity 14 (2019) 467–474 Author name / Structural Integrity Procedia 00 (2018) 000–000

469

3

Fig. 2. Cut pieces of the cooling duct showing cracks.

4. Results 4.1. Chemical composition

The bulk chemical composition obtained by wet chemical analysis technique employing Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) from the damaged cooling duct of fighter aircraft is given in Table 1. The analyzed chemical composition indicates that it is fabricated from Al-Mn alloys (similar to AA3003 or 3004) which are typically used for sheet metal applications.

Table 1. Analyzed chemical composition of the damaged cooling duct. Elements Chemical composition (wt. %) Al Bal. Mn 1.25  0.05 Si 2.19  0.04 Fe 0.4  0.04 Mg 0.13  0.01 Ti 0.12  0.01 Cu 0.01  0.001 Zn 0.021  0.002 Pb 0.021  0.002