In this study damage progression in unidirectional composite specimens is investigated. Transverse Crack Tension specimens are used to stimulate damage in a predetermined progressive sequence. Acoustic Emission (AE) registration technique and its location detection capability is used to identify and locate the damage modes during the tension tests. The k-means++ algorithm is applied to cluster similar AE events and obtain reliable correlations between the damage modes and AE characteristics. Damage modes at the end of interrupted tests are identified under an optical microscope and correlated with locations of AE clusters. It is seen that matrix cracks have high amplitude and duration, whereas delaminations have low amplitude and mid-duration, and fibre breaks have high average frequency characteristics. A finite element analysis was performed to predict the progressive failure behaviour including intralaminar failure and delaminations. The correlations between the AE clusters and damage modes are validated with the finite element model. Analysis (FEA)the fibre direction [6,12,13,16,19,25,27].De Groot et. al [6] tested uncured prepreg and cured [0]8 laminates and observed the registration of high peak frequency AE events during UD tension tests which were believed to be due to fibre breaks. Ramirez-Jimenez and Loutas et. al [12,13] proposed a correlation between the high frequency AE events and the

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