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Research Papers

Evolution of Damage in Near α IMI-834 Titanium Alloy Under Monotonic Loading Condition: A Continuum Damage Mechanics Approach

[+] Author and Article Information
Jalaj Kumar

 Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500058, Indiak_jalaj@yahoo.com

S. Padma1

 Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500058, India

B. Srivathsa, N. Vyaghreswara Rao, Vikas Kumar

 Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500058, India

1

Also at College of Engineering, JNTU, Kakinada 533003, India.

J. Eng. Mater. Technol 131(3), 031012 (Jun 02, 2009) (6 pages) doi:10.1115/1.3086384 History: Received July 19, 2007; Revised October 21, 2008; Published June 02, 2009

In the present work, a continuum damage mechanics model, based on Lemaitre’s concept of equivalent stress hypothesis (1986, “Local Approach to Fracture  ,” Eng. Fract. Mech., 25, pp. 523–537), has been applied to study the evolution of damage under monotonic loading condition in a near α IMI-834 titanium alloy, used for aeroengine components in compressor module. The damage model parameters have been experimentally identified by in situ measurement of damage during monotonic deformation using alternating current potential drop technique. The damage model has been applied to predict damage evolution in an axisymmetrically notched specimen using finite element analysis. A reasonably good agreement has been observed between numerically simulated and experimentally measured damage behaviors. Damage micromechanisms operative in this alloy have also been identified which show multiple damage events.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Bimodal microstructure of IMI-834 titanium alloy

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Figure 2

(a) Smooth tensile test specimen configuration (all dimensions are in millimeters). (b) Notched tensile test specimen configuration (all dimensions are in millimeters).

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Figure 3

Constraint factor-notch radii curve according to Bridgman’s formula

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Figure 4

Damage micromechanisms in smooth and axisymmetrically notched specimens: (a) interrupted smooth specimen, (b) interrupted R9 specimen, (c) smooth specimen after fracture, and (d) R9 specimen after fracture

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Figure 5

Damage-plastic strain curve for smooth specimen

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Figure 6

Damage–strain-stress curve to validate damage model parameters

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Figure 7

2D Mesh of axisymmetrically notched specimen generated by FEM

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Figure 8

Damage evolution behavior of the axisymmetrically notched specimen (R=9 mm): comparison of FEA and experimental results

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Figure 9

Comparison of damage evolution behavior of smooth and axisymmetrically notched specimens

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Figure 10

Stress triaxiality versus plastic strain curve for smooth and axisymmetrically notched specimens

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Figure 11

Damage evolution behavior of the axisymmetrically notched specimen (R=4 mm): validation of damage model parameters

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