eva‎luation of fracture energy in adhesive joints using asymmetric semi-circular bending (ASCB) specimen

3/4/2024 12:00:00 AM

According to the wide application and importance of adhesive joint structures in various industries, many researchers have always introduced and investigated the methods of measuring the fracture energy of adhesive joints. One of the important parameters for studying the effect of each loading mode on the failure of adhesive joints is the mode-mixity phase angle. In this research, the Mixed Mode Bending (MMB) test and the introduction of a new method called Asymmetric Semi-circular Bending (ASCB) in adhesive joints have been investigated in order to measure the fracture energy of the joint as well as the mode-mixity phase angle. In the asymmetric semi-circular bending test, it is possible to study the phase angles of various mode-mixities with the asymmetric change of support distances in finite element simulation and experimental tests. In addition, in order to measure this parameter in mixed-mode tests, various theoretical relations have been presented, which are based on measuring the fracture energy of adhesive joints. In this regard, the existing relationships for the mixed mode bending test are first investigated and then an experimental relationship is presented to measure the mode-mixity phase angle in the asymmetric semi-circular bending test. As a result of these researches, it can be seen that the existing relationships for measuring the phase angle of mode-mixity in the mixed mode bending test are not accurate enough, and for this reason, it is suggested to refer to the asymmetric semicircular bending test in order to obtain more reliable results.

انرژي شكست , اتصالات چسبي , نرخ آزادسازي انرژي كرنشي , خمش نيمه دايروي نامتقارن , زاويه فاز اختلاط مود

fracture energy , Adhesive joints , strain energy release rate , asymmetric semi-circular bending , mode-mixity phase angle

Ali Farahani

Dr. Majid Reza Ayatollahi