02310nam a2200277Ia 4500 MX-MdCICY 20260521091625.0 CICY B-18269 Improving bearing performance of composite bolted joints using z-pins. Composites Science and Technology, 69(7-8), p.883-889, 2009 The effect of z-pins on the bearing properties and damage tolerance of composite bolted joints is experimentally studied in this paper. The region around bolt-holes in carbon/epoxy laminates was reinforced in the through-thickness direction with different volume contents and sizes of fibrous z-pins. Bearing test results show that the z-pins improved the bearing stiffness (by 7.5-9.6 percent), ultimate load (7.7-12.8 percent), failure strength (7.4-9.8 percent), and elastic strain energy absorption to bearing failure (8.5-16.3 percent)of the composite joints. The bearing properties increased at a quasi-linear rate with the z-pin content, but were not dependent on pin diameter. Stiffness is improved by z-pins increasing the through-thickness tensile modulus around the bolt-hole of the joint. Post-mortem microstructural examination of the failed joint specimens revealed that z-pins improve the bearing strength by reducing cracking near the bolt-hole via an interlaminar bridging toughening mechanism that involves debonding and frictional sliding of pins within the damaged region. The elastic strain energy to failure is increased by the through-thickness stiffening and toughening provided by the z-pins. This study proves that the reinforcement of bolt-holes with z-pins increases the bearing properties without the weight penalty incurred with the traditional strengthening method of thickening the laminate around holes. A. POLYMER MATRIX COMPOSITES Z-PINS B. STRENGTH B. MECHANICAL PROPERTIES Li, R. Huong, N. Crosky, A. Mouritz, A. P. Kelly, D. Chang, P. https://drive.google.com/file/d/1gVRQlhooavqIssDP4l5m6ui9ebDrnVXi/view?usp=drivesdk Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx Loc REF1 250602s9999 xx |||||s2 |||| ||und|d 28361 28361 0 0 Loc 0 0 F1 CICY CICY RE 2025-06-25 0 B-18269 2025-06-25 16:02:26 2025-06-25 REF1