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

100%

Derewońko A. , Niezgoda T. , Godzimirski J.

tom 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%.

Flexural rehabilitation of steel beam with CFRP and BFRP fabrics – A comparative study

63%

Bastani A. , Das S. , Kenno S. Y.

tom Vol. 19, no. 3

871--882

This paper compares the performance of structural steel beams retrofitted with two different fiber reinforced polymer (FRP) fabrics: Carbon FRP (CFRP) and Basalt FRP (BFRP) fabrics. A total of eight steel beams with and without corrosion defect in the flexural tension zone were tested under 4-point bending load. The study found that the use of both FRP fabrics resulted in reduced ductility, however, ductility of beams retrofitted with BFRP fabric is much higher than that of the beams retrofitted with CFRP fabric of similar thickness. The study also found that both FRPs fabrics are effective in increasing the ultimate load, yield load, and elastic stiffness of beams, however, number of BFRP fabric layers required is higher than the number of CFRP fabrics. The structural behavior of steel beams including the complex behavior of rupture in the FRP fabrics were successfully modeled using a commercially finite element software and a good correlation was obtained between the finite element models and the lab specimens. Validated finite element model was used to obtain additional information that could not be obtained from the experimental study. This study concludes that the Basalt fabric offers a competitive and green alternative to the Carbon fabric.