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=(蟽1-蟽2)
h : thickness of specimen
N : number of fringes
C : stress-optic coefficient
蟽1 and 蟽2 : the first two principal stresses
Photoelastic testing for model with no hole
Single loading
Photoelastic testing for model with no hole
N Force (N) 饾湈1 饾湈2 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
犀1(applied) 犀3 f N 犀obtained 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
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