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Abstract
The adhesive fracture resistance of structural adhesive joints in mode II, 𝒢IIC, is accessed through the application of two models that prescind of the measurement of the crack length during the subjection of ENF specimens to three-point bending monotonic tests. The load vs transversal displacement results are used in two different approaches: a damage model and a cohesive zone model. The first one was used in test where the crack propagation was unstable and the second one was used for stable crack propagations. These initial results show the viability of the models and show that both: initial crack length and transversal load rate; have great influence in 𝒢IIC evaluation.
Highlights
Structural adhesive joints are characterized by their simplicity and efficiency of use
End notched flexure (ENF) specimens are used in the experimental part and two different models: a proposed damage model and existent cohesive zone model
2. 1 the proposed analytical model The critical energy release rate c can be used to model the behaviour of the bonded specimens during crack generation. To achieve this objective the application of the analytical model, which were originally proposed by ALLIX et al [2] and improved by BARROS and CHAMPANEY [3 - 5], can be divided into two parts: a resistance part comprising the crack propagation curves, for various c values, generated by the application of the classic beam theory together the Linear Elastic Fracture Mechanics (LEFM), as can be seen, for instance, in Fig. 5; and an experimental part represented by result of crack propagation of end notched flexure (ENF) specimens submitted to three point tests
Summary
Structural adhesive joints are characterized by their simplicity and efficiency of use. The adhesive bonding can substitute traditional joints as rivets and screws, with the clear advantage of diminishing the stress concentration effects. One typical example of the use of structural adhesives can be found in repair of pipelines with loss of thickness caused by corrosion. The objective of this work is evaluating the critical energy relief rate IIC of the structural adhesives in mode II. To accomplish this goal, end notched flexure (ENF) specimens are used in the experimental part (where the adhesive is submitted to pure shear loading) and two different models: a proposed damage model and existent cohesive zone model
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