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Stress Concentrations and Fatigue Crack Growth in Fiber Metal Laminates

Author: LiShaoYuan
Tutor: GuoWanLin
School: Nanjing University of Aeronautics and Astronautics
Course: Engineering Mechanics
Keywords: Stress concentration Equivalent stiffness ratio Fiber metal laminates Stress intensity factor Crack FEM
CLC: O346.1
Type: Master's thesis
Year: 2011
Downloads: 202
Quote: 1
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Abstract


Fiber metal laminates is a new aviation structural material consisting of metal foil and fiber reinforced epoxy laminate of alternating layers bonded together . Which has the structure weight and excellent mechanical properties , etc. The main advantage , and in the application of the aircraft fuselage structure has great potential . Since opening in aircraft structural geometry is inevitable , notched residual strength and damage tolerance of fiber metal laminates study of important issues. Through theoretical analysis and numerical simulation of fiber metal laminates with a hole stress concentration problems, and with a central crack fatigue crack propagation problem is studied , including the following elements: 1. Focused on analyzing the fiber metal laminates mechanical properties . And metal and traditional composite materials, fiber metal laminates in static , fatigue crack growth , impact resistance, flame resistance, corrosion resistance , and so has a more prominent advantages. (2) Through the stiffness matrix composite laminates simplification, proposed the concept of equivalent stiffness ratio and studied the stress concentration factor and equivalent stiffness than the intrinsic relationship between , come with different forms oval hole fiber metal laminates stress concentration factor with the equivalent linear stiffness ratio variation . 3 based composite spall criterion and metal fatigue crack growth , through the establishment of the secondary development of finite element software considering hierarchical fiber metal laminates under fatigue crack growth model to analyze the fiber metal laminates fatigue crack expansion and with the experimental results obtained good agreement .

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CLC: > Mathematical sciences and chemical > Mechanics > Solid Mechanics > Strength theory > Fracture theory
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