PSI - Issue 59

M. Karuskevich et al. / Procedia Structural Integrity 59 (2024) 175–181 M. Karuskevich et al. / Structural Integrity Procedia 00 (2019) 000 – 000

177 3

3. Specimens for the negative effect investigation. Test procedure Specimen for fatigue test (Fig. 2) has been developed so that it reflects typical design of longitudinal riveted lap joint widely used in aircraft fuselage structures.

Fig. 2. Specimen for fatigue tests.

Material for specimens – is aluminium alloy 1163 ATВ in the as received condition. This is a high-strength alloy similar to Al 2024-T351. Mechanical properties of 1163 АТВ and its chemical composition, given by the manufacture are shown in Tables 1and 2.

Table 1. Mechanical properties of the 1163 АТВ alloy. Temper

Yield Strength, MPa Ultimate Strength , М P а

Max Elongation, %

302 – 311

419 – 430

17.5 – 20.5

АТВ

Table 2. Chemical composition of the 1163 АТВ alloy. Fe Si Mn Ni Ti Al

Cu

Mg

Zn

0.04 %

0.03 %

0.6 % 0.01 %

0.03 %

Basic component

4.28 %

1.24 %

0.02 %

Rivets made of aluminum alloy В65 ( Tables 3, 4) (Aviation materials. Handbook, 1982). Table 3. Mechainical properties of the B65 alloy ( Aviation materials. Handbook, 1982). Temper Yield Strength, MPa Yield Strength, MPa Max Elongation, % Т 40 23 23

Table 4. Chemical composition of the В65 alloy (splav-kharkov.com). Fe Si Mn Ti Al

Cu

Mg

Zn

Impurities

Below 0.2% Below 0.25%

0.3 – 0.5%

Below 0.1%

93.65 – 95.65% 3.9 – 4.5%

0.15 – 0.3% Below 0.1% Total 0.1%

CPCs selected for the investigation are those used currently in aviation industry and commercially available. Taken into account the preliminary character of the presented research results and need for more complex approach for the future experiments CPC used in this paper are noted as: CPC1, CPC2, and Reference Compound (RC). CPC 1 is a material with lowest viscosity and highest penetration. CPC 2 has greater viscosity and less penetration. Reference Compound is a mixture of kerosene and widely used grease Ciatim-201. Both components of the Reference Compound have lubricating properties, thus are considered as materials able to influence friction between the mating surfaces of the lap riveted joint.