EFFECT OF IMPACT ENERGY ON THE RESIDUAL STRENGTH OF A LAMINATED CARBON FIBER REINFORCED POLYMER
Yu.G. Matvienko1, I.E. Vasiliev1, S.I. Eleonsky2, V.S. Pisarev2
1Mechanical Engineering Research Institute, Russian Academy of Sciences, Moscow, Russia
2Central Aerohydrodynamic Institute, Zhukovsky, Russia
Keywords: composite specimen, impact, compression test, residual strength, ultimate load, speckle pattern interferometry, residual stress
Abstract
Results of experimental investigations into the effect of impact energy on the residual compressive strength of high-strength laminated carbon fiber reinforced polymer specimens are presented. To study the influence of residual stress levels induced by impact on the residual strength of the specimens, additional measurements are performed using electronic speckle pattern interferometry in conjunction with the drilling of small probe holes. Residual stress values are determined in the mid-plane of the specimens at the boundaries of the impacted zones. The scatter in the experimental data, arising from distributed damage within the material microstructure, prevents establishing a correlation between residual stresses after impact with energies of 0-110 J and the residual strength of the specimens.
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