Analysis of Microslips and Friction in the Riveted Joints

Szymczyk, E.; Jachimowicz, J.; Derewońko, A.; Sławiński, Grzegorz

doi:10.4028/www.scientific.net/ssp.165.388

Cited by 3 publications

(1 citation statement)

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“…The riveted joints are critical areas of the aircraft structure due to severe stress concentrations, plastic strain and secondary bending as well as micro-local effects such as surface damage (fretting wear). These phenomena cause fatigue crack initiation at the rivet holes or between the sheets, which propagate and decrease fatigue resistance of the riveted joint [2,[7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Some Aspects of Dynamic Riveting Simulations

Szymczyk

Jachimowicz²,

Puchała³

2015

Journal of KONES. Powertrain and Transport

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Riveting is a commonly used (especially in aircraft structures) method of joining metal and composite components. The methods of forming solid shank rivets can be classified in two types: static and dynamic. The static method is the most efficient one. Regrettably, its application is limited. A popular upsetting tool used in an aircraft is a pneumatic riveter. The rivet driving requires a few hammer strokes.The total stress in a riveted joint depends on the residual and applied stress. Residual post-riveting stress fields are widely accepted to have a beneficial influence on the fatigue life of aircraft structures. The analysis is carried out for a solid mushroom rivet (made of PA25 alloy) joining two sheets (made of 2024T3 alloy). Nonlinear dynamic simulations of the upsetting process are carried out. Simulation of the riveting process is significantly influenced by a material model.The numerical calculations are performed for three different cases of upsetting described by the formed rivet head diameters 1.4d, 1.5d and 1.6d, respectively. The rivet head diameter and, consequently, the residual stress state depend on hammer stroke energy. It has a significant influence on a plastic region around the rivet hole, whereas the influence of a number of strokes can be neglected.The strain rate in both local and global (average) formulation is analysed in the paper. For one hammer stroke, the global strain rate of the rivet shank is about 1.0 thousand per second. The local strain rate is about two times greater than the global one, so a strain rate factor has an effect on the residual stress state. For a few hammer strokes, the strain rate is lower than for one stroke; however, it increases a little in each stroke. The hole deformation can be treated as a function of the internal energy of the sheet. The lower total energy of the part the greater influence of the strain rate on the internal energy is observed.

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Section: Introductionmentioning

confidence: 99%