Numerical Analysis of Material and Manufacturing Factors in Riveted Joints Under the Imperja Project

• Autorzy: Szymczyk E. , Bogusz P. , Sławiński G. , Jachimowicz J.

Identyfikatory

DOI

10.2478/v10164-012-0062-5

• Języki publikacji: EN

Abstrakty

EN

The aim of the project was to improve fatigue performance of riveted joints in airframes. Fatigue strength of a joint depends on structural, material and manufacturing factors. The project involved numerical and experimental analysis of material factors and manufacturing imperfections. The paper deals with the analysis of material structure and properties by means of the optical and SE methods. Static monotonic tests for sheet and rivet materials were carried out. ARAMIS optical system was used for the study of deformation and strain fields in the material during loading. This tool offers the possibility of a non-contact measurement with 3D image correlation methods (digital image correlation, DIC) using high-resolution digital CCD cameras. In ductile materials (such as aluminium alloy), subjected to appropriate loading conditions, voids may form, which grow and coalesce leading to crack formation and potential failure. A micro crack may be initiated at the inclusion particles and then voids grow around it. Experimental studies showed that these processes are strongly influenced by hydrostatic stress (Gurson’s material model). SEM analysis of material structure was carried out after performing static tests. In the paper, the authors present the influence of a material model on the results of numerical simulation of the tensile loaded samples with open and riveted holes. The application of Gurson’s material model allows observation of crack growth in the sample cross-section and determination of the sheet rupture as the moment when constraint force decreases to zero (material separation occurs).

Słowa kluczowe

EN

riveted joints; fatigue strength; optical methods; SEM analysis

• Wydawca: Wydawnictwa Naukowe Sieci Badawczej Łukasiewicz - Instytutu Lotnictwa
• Czasopismo: Fatigue of Aircraft Structures
• Rocznik: 2012
• Tom: Iss. 4
• Strony: 100--113
• Opis fizyczny: Bibliogr. 9 poz., fot., rys., tab., wykr., wzory

Twórcy

autor

Szymczyk E.

• Military University of Technology, Warsaw, Poland

autor

Bogusz P.

• Military University of Technology, Warsaw, Poland

autor

Sławiński G.

• Military University of Technology, Warsaw, Poland

autor

Jachimowicz J.

• Military University of Technology, Warsaw, Poland

Bibliografia

• [1] Dyląg Z., Jakubowicz A., Orłoś Z. (1996). Wytrzymałość Materiałów. WNT, Warszawa.
• [2] Kocańda S. (1985). Zmęczeniowe pękanie metali, WNT, Warszawa. Wydanie III rozszerzone.
• [3] Gurson, A.L. (1977). Continuum theory of ductile rupture by void nucleation and growth. Part I - Yield criteria and flow rules for porous ductile media, Engineering Materials and Technology, 99, pp. 2-15.
• [4] Tvergaard V. Influence of voids on shear band instabilities under plane strain conditions. Int J Fract (1981), 17: 389-407.
• [5] Tvergaard V. On localization in ductile materials containing spherical voids. Int J Fract (1982), 18: 237-52.
• [6] Szymczyk E., Sławiński G. (2010). Influence of material model on tensile loaded joint, Solid State Phenomena, 165(2010), pp. 394-399.
• [7] MSC Marc, Theory and User Information, MSC Corp. 2010.
• [8] Aramis, Documentation 2010.
• [9] ASTM A 370-03a, Standard Test Method for Tension Testing of Metallic Materials, 2003.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.