Experimental Identification of Frictional Effects on Interlaminar Toughness of Composite Laminates in 4ENF Test

• DOI: 10.1007/s11340-022-00860-8
• Publication Date: 2022-06-10T00:02:33Z
• Authors: P. Ballarin; A. Airoldi; P. Aceti; S. Ghiasvand; G. Sala
• Keywords: Delamination

Abstract Background Understanding and characterizing delamination in composite laminates is fundamental for analysing their structural integrity, since operational loads may promote the propagation of interlaminar defects. Propagation often occurs mode II driven by shear stress. However, methods used to characterise this are affected frictional effects between crack surfaces. Objective This work aims build up an experimental method identify effect friction a 4 points End Notched Flexure test, which does not require use analytical or numerical models specimen. Methods goal achieved performing series loading–unloading cycles before helps calibrate expression that estimates energy dissipated friction, then inserted into formulation Irwin-Kies equation. Experimental validation carried out considering tests on different materials conditions surfaces, as well means virtual experiment being performed comparison with model presented literature. The novelty lies fact it development any specimen consequently no calibration required. Results Tests specimens show good results, contribution estimated comparable those Moreover, shows there match results obtained using Conclusions seems provide satisfactory both real experiments, moreover, procedure relatively simple, making suitable evaluation point test.