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Fatigue strength investigation of bonded joints

Gieleta R., Derewońko A.

Journal of KONES

2007

Vol. 14, No. 3

177-186

Numerous advantages of the bonded joints result in wide application in the aircraft, motor industry or powertrain components. These types of joints enable joining materials with different mechanical properties (e.g. Stiffness) and dimensions without structure change. Proper joint design limits the field of local stress concentrations or even eliminates them. The structural integrity of complete structure depends on the fatigue estimation of the bonded joint. Application of the finite element method to life prediction of the double lap bonded joint metal-composite-metal is presented. Three dimensional numerical models are generated by professional engineering software tools. The contact problem is modelled between the epoxy resin and metal and composite surfaces. A laminated composite consists of the epoxy woven carbon prepreg. Elasto-plastic materials models of the adhesion and metal and orthotropy composite model allowed determining the contact normal stress in the interfaces in each deformation increment which is induced by an external load. MSC.Marc was used to determine the strain and stress distribution in the double lap bonded joint including contact normal stress in the steel/adhesive and laminated composite/adhesive interfaces. Two numerical models of the double lap bonded joint were compared. The use of the presented method is more suitable for structure optimisation than numerical analysis.

3D numerical investigation of tensile loaded lap bonded joint of aircraft structure

Derewońko A., Niezgoda T., Godzimirski J.

Journal of KONES

2006

Vol. 13, No. 3

61-68

Adhesive bonding is becoming one of the most popular joining techniques in automotive and aircraft industry. The adhesively bonded joints need to be designed to minimize tensile stress. The most widely used method of an adhesive joint strength test is the lap-shear test. Single lap joints create bending loads in the adherends and tensile stress in the adhesive. The mechanism of shear deformation of the adhesive and adherend layers and separation occurring at the adherend/adhesive interface are discussed in this paper. Uniaxial tensile test of a lap bonded joint and numerical simulations were carried out. 3D numerical model of single lap bonded joint consists of three components described as separate solids. Glue contact is defined between the joined layers. This approach allows to determine and compare stress distribution along the adhesive and the adherend bondline. Experimental data are used to establish the engineering stress-strain curves for the aluminium adherends and the epoxy adhesive. Two step loadings are applied. The results of laboratory tests compare favourably with VG and Reissner closed-form solutions and numerical simulations. Non-linear analyses of a 0,03 mm thick adhesive layer show that the shear stresses along the adhesive bondline exceed stresses along the adherend line by 1% to 50%.