Modelling mechanical interfaces experiencing micro-slip/slap

Figures & data

Figure 1. The structure including a contact interface and its corresponding FE model.

Figure 2. The 2D thin-layer element.

Figure 3. Test structure with an interface area of 50 × 25.4 mm², structure geometrical dimensions and the location of applied force and measurements.

Figure 4. Linear FRFs: pre-loads of 120 N (▪) and 540 N (•).

Table 1. Experimental and updated natural frequencies at different pre-loads.

	Pre-load: 120 N  = 3.9 × 10^8 N m^−2,  = 7.6 × 10^7 N m^−2
	ω1 (Hz)	ω2 (Hz)	Ω3 (Hz)	ω4 (Hz)
Experimental	26.50	157.60	471.80	895.00
Updated	26.53	157.82	477.24	891.69
Error (%)	−0.11	−0.14	−0.15	0.36
	Pre‐load: 540 N  = 5.9 × 10^8 N m^−2,  = 7.4 × 10^7 N m^−2
Experimental	26.60	159.20	472.50	904.00
Updated	26.54	159.15	477.59	900.23
Error (%)	0.18	0.02	−1.07	0.41

Figure 5. Nonlinear FRFs at different excitation levels: F = 1.5 N (•), F = 3 N (▾) and F = 6 N (♦); pre-loads of 540 N (right) and 120 N (left).

Figure 6. FE mesh and the mode shapes of the updated FE model.

Figure 7. Experimental (lines) and predicted (marks) FRFs (left), updated functions g₁(X) and g₂(X) (right); at pre-loads of 120 N (▪) and 540 N (•).

Figure 8. Changes in objective function (left) and updating parameters (right) at a pre-load of 120 N.

Figure 9. Experimental (lines) and predicted (marks) FRFs (left), updated functions g₁(X) and g₂(X) (right); pre-loads of 120 N (▪) and 540 N (•).

Figure 10. Experimental (lines) and predicted (marks) FRFs (left), updated functions g₁(X) and g₂(X) (right); pre-loads of 120 N (▪) and 540 N (•).