Abstract
This paper presents new analytical model of asymmetric mixed-mode bending (MMB) specimen of adhesively bonded pultruded GFRP joints. An easily applicable relationship for the calculation of the strain energy release rate of the asymmetric MMB specimens is proposed based on the beam theory. The model is capable to analyze stacking sequence as well as various crack propagation paths. In the paper the effect of the various fiber bridging length and different crack propagation paths is analyzed analytically and supported by experimental results. The methodology and results presented in this paper could be utilized for the design of both joint geometry and lay-up of the laminates constituting the joint or for the prediction of the fracture behavior of such structures.
Highlights
Fiber reinforced polymers are modern kind of materials that benefit from their high stiffness vs. weight ratio
This paper presents new analytical model of asymmetric mixed-mode bending (MMB) specimen of adhesively bonded pultruded GFRP joints
An applicable relationship for the calculation of the strain energy release rate of the asymmetric MMB specimens is proposed based on the beam theory
Summary
Fiber reinforced polymers are modern kind of materials that benefit from their high stiffness vs. weight ratio. The asymmetrical specimens are, often accompanied by relatively thick adhesive layer or asymmetry of the stacking sequence either in the laminate or in the adhesive joint and there is a need for the development of the new procedures for the calculation of the strain energy release rate components Another way is to describe the delamination behavior using the complex stress intensity factor introduced in [4,9]. There exists analytical expression for the calculation of the total strain energy release rate of the symmetrical MMB specimen derived by Reeder and Crews in [18,19] in the following form: G This model has been successfully applied for the adhesively bonded laminate joins where the thickness of the adhesive layer was negligibly thin. The displacement of the loading lever below the force P is : uP a 3cPu 3LE1I1
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