Determination of Anisotropy in Impact Toughness of

Aluminium Alloy 2024 T3 Plate

Muhammad Habibullah SiddiquiCollege of Aeronautical Engineering, Risalpur, Pakistan

2013 IEEE Aerospace Conference, Big Sky, MT

Sequence of Presentation

• Abstract

• Introduction

• Literature Review

• Experimental Work

• Experimental Results

• Discussion and Analysis

• Conclusion

2

Abstract

• Aimed to quantify the existence of anisotropy in the impact toughness property of aluminium alloy 2024 T3 plate

• Results helpful in designing aircraft components• Charpy V notch Impact Toughness test utilised• Effect of specimen orientation was investigated• Research validated by comparison with known results• Maximum and minimum impact toughness orientations

were found• Error analysis was carried out

It was concluded that anisotropy in impact toughness does exist in Aluminium alloy 2024 T3 plate

3

Introduction

• Usage of Aluminium Alloy 2024 T3

• Anisotropy; a physical property in metals and alloys

• An experiments-based research

• ASTM standard results taken as a reference

4

Literature Review

• Pioneering work by Dr. Alimullah Khan (1963)

• This research investigates the actual behaviour of materials

• Cold working modifies the properties of materials

• Types of anisotropy as proposed by Klinger and SachsCrystallographic anisotropy

Anisotropy due to elongation

Anelastic anisotropy

• Using a mathematical approach, Hazlett verified the existence of anisotropy in Aluminium alloy 2024 T3 plate (1963) in theory

5

Experimental Work (1/2)

• Charpy Impact Testing

• ASTM Standard E 23 was followed

• Plate Directions

6

Experimental Work (2/2)

• Notch Direction

• Specimen Preparation

• Coding of Specimen

Orientation Symbol

L-S A

L-T B

T-S C

T-L D

7

Experimental Results (1/4)

• Testing at Reference Laboratory

8

Experimental Results (2/4)

• Results of the Experiments

9

SPECIMEN NO.

ABSORBED ENERGY (JOULES)

ORIENTATION

L-S(A) L-T(B) T-S (C) T-L(D)

1 15 9 20.5 162 15.5 10 20 153 15 9.5 19 164 13 11 20.1 16.55 14 10 21.46 16.876 15.5 10.5 19.95 167 16 10.11 18.81 16.238 15.6 9.52 20.79 15.99 15 10.7 19.1 16.23

10 17.51 11.29 19.5 15.611 16.1 10.1 20.79 16.8712 15.5 9.02 19.46 16.2313 14.6 9.9 19.83 16.2314 14.4 10.6 20.13 15.615 15.25 11 20.13 16.8716 13.96 11.29 20.13 16.8717 15.65 10.7 20.13 16.2318 14.23 11.2 20.13 16.23

MEAN 15.10 10.30 20 16.20ASTM VALUE 15 10 U/A U/A

Experimental Results (3/4)

• Fractography of Notch Surfaces of each orientation

L-S L-T

T-S T-L 10

Experimental Results (4/4)

• Visual Comparison of Fractured Surfaces

L-S L-T

T-S T-L11

Discussion and Analysis (1/2)

• Reliable Results• Anisotropy successfully determined• Comparison with known results

12

Discussion and Analysis (2/2)

• Error AnalysisPossible Causes of Error

Percentage errors of different orientations

13

Conclusion

• Charpy Impact energy of different orientations was found different, hence anisotropy determined

T-S orientation of the plate exhibited maximum impact toughness

L-T orientation exhibited minimum impact toughness

• Results of research are reliable and valid

• Research can form a corner stone for further study

14

Thank You

15

Biographies (1/3)

• Muhammad Habibullah Siddiqui received his Bachelors degree in Aerospace Engineering from College of Aeronautical Engineering, National University of Sciences and Technology,Risalpur, Pakistan in 2008.

• Served as maintenance supervisor in an operational flight line for two years

• Currently, a part of an aircraft manufacturing facility

chakkolehri@hotmail.com

16

Biographies (2/3)

• Dr. Fahim Hashmi is an Aerospace engineer by profession.

• Earned Masters and PhD from Beijing University of Aeronautics and Astronautics in the field of Materials Science and Engineering specializing in structural integrity assessment and failure analysis

• Formerly, served as Head of Aerospace Engineering Dept at College of Aeronautical Engineering, Risalpur, Pakistan

• Now, heading the Failure Analysis Centre at the School of Chemical and Materials Engineering, National University of Science and Technology, Islamabad, Pakistan

17

Biographies (3/3)

• Mr. Ahmad Junaid is an Aerospace Engineer.

• Earned his BE (Aerospace) and MS (Structures) from College of Aeronautical Engineering, Risalpur, Pakistan. He has also served as an associate professor for five years in the same college.

• Presently, a part of the project planning office in an aircraft manufacturing facility.

18