Determination Material Properties and Fracture Parameters of Triangular holed Aluminium Samples

Determination Material Properties and Fracture Parameters of Triangular holed Aluminium Samples

Structural Lab Project Presentation

Pushpal Mazumder 10CE31001JagmohanSaikia 10CE31002Devarsh Bhonde 10CE31003Pankaj Menawat 10CE31004Ashvini Kumar 10CE31005ManpreetChaudhary 10CE31006

Problem Definition

ProblemDefinition

To determine material properties and fracture parameters ofaluminium samples:

To obtain material properties of plane aluminium sample

To determine fracture parameters and failure regions of singletriangular hole aluminium plate

Find minimum distance between two symmetrical triangular holesto ensure no failure occurs between the two holes in ABAQUS

To determine fracture parameters and failure regions of doubletriangular holed aluminium plate employing the minimum distancebetween the holes

Methodology and Analysis

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

UTM Testing

UTM Testing

Uniaxial testing was performed over aluminium sample 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

UTM Testing

UTM Testing

Stress-strain plot for base model without any hole

UTM Testing

Stress-strain plot for base model with single hole

UTM Testing

UTM Testing

Stress-strain plot for base model double holes

Photoelastic testing

PhotoelasticTesting

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

Photoelastic testing for model with no hole

Single loading

Photoelastic testing for model with no hole

N Force (N) 𝜎1 𝜎2 h f

3 188 0 -0.5013 2.5 0.41777778

5 288 0 -0.768 2.5 0.384

f average-0.40088889

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

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

Photoelastic testing for model with single hole Fringes developed in the model with single hole at a load of 1095 N

Input

forceh 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