PSI - Issue 71

Abdul Khader Jilani Shaik et al. / Procedia Structural Integrity 71 (2025) 42–49

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Table 4 Comparison of Stress Concentration Factor (SCF) for a typical Lug-Bush-Pin Configuration.

Typical Bush Pin Configuration BI4-PC1 (Bush 0.4%int Pin 0.1% cl etc.)

K t (Analytical)[7]

K t (FEM)

% of Error

3.315

3.254 3.364 3.405 3.483 3.509

1.84% 1.06% 2.30% 1.26% 1.71%

BI4-PC2 BI4-PC3 BI4-PC1 BI4-PC1

3.4

3.485 3.528

3.57

5 Fatigue Life Estimation of the Bush and Lug The Lug-Bush-Pin joint is subjected to a gradual load increase ranging from 9.5 kN to 28 kN. A comprehensive fatigue analysis was conducted based on strain-life parameters detailed in Table 2 which were calculated based on methods detailed in [6]. The consolidated fatigue life comparison of Bush with all fit combinations is meticulously presented in Fig. 6 (a), while Fig. 6 (b ) illustrates the fatigue life comparison between Lug and Bush across varying Bush interference and differing Pin clearances.

(a)

0.1% 0.2% 0.3% 0.4% 0.5%

(b)

0.2% 0.3%

0.4%

0.5%

0.1%

Fig. 6 Comparison of Fatigue Life of Bush (a) and Lug (b) with various fit combinations of Bush & Pin.