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Fracture Mechanics Analysis of Fuselage Structural Joints with Cracks

  • H. RameshaEmail author
  • N. C. Mahendra Babu
  • H. V. Lakshminarayana
Conference paper

Abstract

Fracture mechanics provides a methodology for prediction, prevention and control of fracture in materials, components, and structures. Fracture mechanics analysis is the backbone of damage tolerant design. Objectives of fracture mechanics analysis are: (1) stress analysis of cracks to derive crack tip stress field equations and define crack tip stress intensity factors , (2) determination of SIF solutions as function of crack length, orientation and applied loads for a given geometry, (3) prediction of mixed mode fracture under static, dynamic, and sustained loads, (4) prediction of residual strength as a function of crack length. The focus of this paper is on fracture mechanics analysis of longitudinal and circumferential joints of aircraft fuselage structure with cracks. The loading is by internal pressure. Commercial FEA software ANSYS and a special purpose post-processing subprogram called 3MBSIF are used to determine mixed mode membrane and bending SIF solutions. Residual strength prediction is based on the use of strain energy density theory of fracture. Significant results of this study are graphically presented and discussed in this paper.

Keywords

Fuselage Structural integrity Longitudinal joint Circumferential joint Crack Residual strength Stress intensity factor 

Nomenclature

t

Thickness

E

Modulus of elasticity

υ

Poisson’s ratio

a0

Initial half crack length

acr

Critical half crack length

K1

Mode 1 stress intensity factor

K2

Mode 2 stress intensity factor

K3

Mode 3 stress intensity factor

K1

Mode 1 stress intensity factor range

K2

Mode 2 stress intensity factor range

N

Number of cycles

References

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • H. Ramesha
    • 1
    Email author
  • N. C. Mahendra Babu
    • 2
  • H. V. Lakshminarayana
    • 1
  1. 1.Department of Mechanical EngineeringDayananda Sagar College of EngineeringBangaloreIndia
  2. 2.Department of Mechanical and Manufacturing EngineeringMSRUASBangaloreIndia

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