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This article presents result of accelerated test according to Annex D.3 Cycle D2 - Heat, cold (thermal shock) and humidity cycle of standard ISO 9142: 2003 for determination of bonding strength of 5 adhesives manufactured in Vietnam. They are: K-153.VN, KT-18.VN, E6-1C.VN, K300-61.VN, 88CA.VN. Herewith, the first four adhesives are based on modified epoxy while 88CA.VN is a neoprent rubber solvent based adhesive. These adhesives are intended to be used in aviation field. The accelerated test was lasting in 15 cycles, each cycle is equal to 24 hours. The T-peel strength and shear strength of the four epoxy based adhesives has been assessed in relation to standards ASTM D1876-08 and ГОСТ 14759-69 respectively. While the 180o and 90o Peel Strip Strength of adhesive 88CA.VN has been evaluated according to standard ГОСТ 411-77. The assessment of bonding strength has been conducted after 3, 5, 7, 10, and 15 test cycles. It is shown that, the bonding strength of all adhesives has been reduced during the test process. Moreover, the decrease rate of T-peel strength was higher than that of shear strength. After 15 cycles of accelerated test, the shear strength of K153.VN adhesive, as well as the 180° Peel Strip Strength of 88CA.VN one were still higher than the required strength level for these adhesives. In addition, E6-1C.VN adhesive remained durable after seven cycles. |
