In this project material properties and fracture parameters of aluminum samples are determined. This involves - finding material properties of plane aluminum sample - Determine fracture parameters and failure regions of single triangular hole in aluminum plate -Find minimum distance between two symmetrical triangular holes to ensure no failure occurs between the two holes in ABAQUS -Determine fracture parameters and failure regions of double triangular holed aluminium plate employing the minimum distance between the holes.

1. Determination Material Properties and
Fracture Parameters of Triangular holed
Aluminium Samples

2. Structural Lab Project Presentation
PushpalMazumder 10CE31001
JagmohanSaikia 10CE31002
Devarsh Bhonde 10CE31003
Pankaj Menawat 10CE31004
AshviniKumar 10CE31005
ManpreetChaudhary 10CE31006

3. Problem Definition

4. Problem
Definition
To determine material properties and fracture parameters of
aluminiumsamples:
 To obtain material properties of plane aluminium sample
 To determine fracture parameters and failure regions of single
triangular hole aluminium plate
 Find minimum distance between two symmetrical triangular holes
to ensure no failure occurs between the two holes inABAQUS
 To determine fracture parameters and failure regions of double
triangular holed aluminium plate employing the minimum distance
between the holes

5. Methodology and Analysis

6. Methodology
and Analysis
 Rectangular specimen of aluminium 300mm x 50mm x 5mm
 Three different specimens are used to determine the physical properties
and fracture parameters:
 Plane aluminium plate
 Aluminium plate with an inclined triangular hole at center with geometry
 Aluminium plate with two inclined triangular hole at variable distance to
study failure effects.
Aluminium Plate with single triangular hole
Aluminium Plate with double triangular hole

7. UTM Testing

8. UTM Testing
 Uniaxial testing was performed over aluminiumsample of size 300
mm x 50 mm x 5mm in Universal Testing Machine (60T) in order to
determine the material properties such as: Young's modulus,
Poisson's ratio and yield strength

9. UTM Testing

10. UTM Testing
Stress-strain plot for base model without any hole

11. UTM Testing
Stress-strain plot for base model with single hole

12. UTM Testing

13. UTM Testing
Stress-strain plot for base model double holes

14. Photoelastic testing

15. Photoelastic
Testing
 The model is used for calibration i.e. to obtain the stress-optic
coefficient. Single point and double point loadings are used to
determine this coefficient. The required parameter is obtained
using the following equation:
 Nf/h=(σ1-σ2)
 h : thickness of specimen
 N : number of fringes
 C : stress-optic coefficient
 σ1 and σ2 : the first two principal stresses

16. Photoelastic testing
for model with no hole
Single loading

17. Photoelastic testing
for model with no hole
N Force (N) 휎1 휎2 h f
3 188 0 -0.5013 2.5 0.41777778
5 288 0 -0.768 2.5 0.384
f average
-0.40088889

18. Photoelastic testing
for model with single
hole
Fringes developed in the model with single hole at a load of 120 N
Fringes developed in the model with single hole at a load of 380 N

19. Photoelastic testing
for model with single
hole
Fringes developed in the model with single hole at a load of 550 N
Fringes developed in the model with single hole at a load of 710N

20. Photoelastic testing
for model with single
hole Fringes developed in the model with single hole at a load of 1095 N
Input
force
h width
Area of
cross-section
Ϭ1(applied) Ϭ3 f N Ϭobtained SC factor
120 2.6 25 65 1.846153846 0 7.007 1 2.695 1.459792
380 2.6 25 65 5.846153846 0 7.007 3 8.085 1.382961
550 2.6 25 65 8.461538462 0 7.007 4 10.78 1.274
710 2.6 25 65 10.92307692 0 7.007 5 13.475 1.233627
1095 2.6 25 65 16.84615385 0 7.007 7 18.865 1.11984