Tensile load bearing capacity

Co-cured lap joints, surface roughness, stacking sequence, manufacturing pressure, tensile load bearing capacity, fatigue characteristics. 

The bond length of the specimens under cyclic tensile test was 20mm. Cyclic tensile tests were performed under the condition of stress ratio 7 = 0.1 and a loading frequency / = 5 Hz. Cyclic tensile loads applied to the co-cured single lap joint specimens were 30%, 40%, 50%, 60%, and 70% of the tensile load bearing capacity obtained from the static tensile load test. 

Fig. 5. Tensile load bearing capacities of the co-cured lap joints with respect to the surface roughness between steel and composite adherends. (a) Co-cured single lap Joint and (h) cocured double lap Joint.

Tensile load bearing capacities of the co-cured lap joints with respect to the... 

In contrast with the co-cured single lap joint, tensile load bearing capacity of the co-cured double lap joint decreases as the stacking angle of the composite adherend increases. Sint e the co-cured double lap joint has symmetrical configuration, it is important to consider the out-ofplane shear stress rather than the out-of-plane peel stress in designing the joint. 

FINITE ELEMENT ANALYSIS AND EVALUATION OF THE TENSILE LOAD BEARING CAPACITY OF THE CO-CURED LAP JOINTS... 

Based on the failure mechanisms and stress distributions at the interface between steel and composite adherends of the co-cured single and double lap joints, tensile load bearing capacities of the two joints were evaluated. Since failure started at the edge of the interface between steel and composite adherends, it is important to consider the failure criterion using interfacial out-of-plane stress distributions at the interface. Three-dimensional Tsai-Wu and Ye-delamination failure criteria were used to predict partial cohesive failure or interlaminar delamination failure in the co-cured single and double lap joints. 

Equation (1) must be less than 1 failure is predicted when F/ is > 1. Based on the three-dimensional Tsai-Wu failure criterion, tensile load bearing capacities of the co-cured single and double lap joints were calculated. 

Figure 14 compares the tensile load bearing capacity of the co-cured single lap joint evaluated... 

Fig. 14. Comparison of tensile load bearing capacities of co-cured single lap joint (fabricated under 0.7 MPa manufacturing pressure) calculated from the two failure criteria with experimental results.

Figure 15 compares the tensile load bearing capacity of the co-cured double lap joint calculated from the two failure criteria with experimental results. The tensile load bearing capacity of the co-cured double lap joint evaluated through the three dimensional Tsai-Wu failure criterion was in good agreement with the experimental results because of its failure mechanism, interlaminar delamination failure at the 1 ply of the composite adherend. 

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