Stress and fracture analysis of riveted joints

Download

index.pdf

Date

2008

Author

Keçelioğlu, Galip

Metadata

Show full item record

Item Usage Stats

161
views

77
downloads

The objective of this study is to model and analyze a three dimensional single riveted lap joint (with and without a crack). By using finite element method, stress and fracture analyses are carried out under both the residual stress field and external tensile loading. Using a two step simulation, riveting process and subsequent tensile loading of the lap joint are simulated to determine the residual and overall stress state. Residual stress state due to riveting is obtained by interference and clamping misfit method. By employing different interference and clamping misfit values, the effects of riveting process parameters on stress state are examined. Two cracks namely the semi elliptical surface crack at faying surfaces of plates and the quarter elliptical corner crack at rivet hole are the most widely observed crack types in riveted joints. Fracture analysis of cracked riveted joints is carried out by introducing these two crack types to the outer plate at a plane perpendicular to the loading. The mixed mode stress intensity factors (SIFs) and energy release rates (G) around the crack front are obtained by using displacement correlation technique (DCT). Effects riveting process parameters (interference and clamping ratios) and geometrical parameters (crack shape and size) on fracture parameters are studied. The stress intensity factor solutions presented herein could be useful for correlating fatigue crack growth rates, fracture toughness computation, and multiple site damage (MSD) analysis in aircraft bodies.

Subject Keywords

Mechanical engineering., Residual stress.

URI

http://etd.lib.metu.edu.tr/upload/12610132/index.pdf
https://hdl.handle.net/11511/18058

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Stress and fracture analysis of riveted joints Keçelioğlu, Galip; Dağ, Serkan; Department of Mechanical Engineering (2008) The objective of this study is to model and analyze a three dimensional single riveted lap joint (with and without a crack). By using finite element method, stress and fracture analyses are carried out under both the residual stress field and external tensile loading. Using a two step simulation, riveting process and subsequent tensile loading of the lap joint are simulated to determine the residual and overall stress state. Residual stress state due to riveting is obtained by interference and clamping misf...
Three dimensional fracture analysis of fillet welds Fıçıcı, Ferhan; Dağ, Serkan; Department of Mechanical Engineering (2007) The aim of this study is to model three dimensional surface crack problems in fillet welds. It is assumed that weld material has the same material properties with the sheet metals. The surface crack is considered to occur at two regions; one at the weld root and the other at the weld toe. The surface crack is assumed to have a semi elliptical crack front profile. The surface crack problem is analyzed under mechanical loading and the models are built up by three dimensional finite elements. Around the crack...
Fatigue crack growth analysis models for funcionally graded materials Sabuncuoğlu, Barış; Dağ, Serkan; Department of Mechanical Engineering (2006) The objective of this study is to develop crack growth analysis methods for functionally graded materials under mode I cyclic loading by using finite element technique. The study starts with the analysis of test specimens which are given in ASTM standard E399. The material properties of specimens are assumed to be changing along the thickness direction according to a presumed variation function used for the modeling of functionally graded materials. The results of the study reveal the influence of different...
Structural Optimization Using ANSYS Panayırcı, H. Murat; Oral, Süha; Department of Mechanical Engineering (2006) This study describes the process of performing structural optimization using ANSYS. In the first part, the general concepts in optimization and optimization algorithms for different type of optimization problems are covered. Also finite element method is introduced briefly in this part. In the second part, important definitions in structural optimization are mentioned. Then the optimization methods available in ANSYS are explained with their theories. Necessary steps to perform optimization with ANSYS are d...
Axisymmetric finite cylinder with rigid ends and a circumferential edge crack Durucan, Ayşe Ruşen; Geçit, M. Ruşen; Department of Engineering Sciences (2010) An axisymmetric finite cylinder with rigid ends and a circumferential edge crack is considered in this study. The finite cylinder is under the action of uniformly distributed loads at two rigid ends. Material of the finite cylinder is assumed to be linearly elastic and isotropic. This finite cylinder problem is solved by considering an infinite cylinder containing an internal ring-shaped crack located at z=0 plane and two penny-shaped rigid inclusions located at z=±L planes. General expressions of the infin...

Citation Formats

G. Keçelioğlu, “Stress and fracture analysis of riveted joints,” M.S. - Master of Science, Middle East Technical University, 2008.