Fatigue & Fracture Mechanics B.Tech Question Paper : vardhaman.org
College : Vardhaman College Of Engineering
Degree : B.Tech
Department : Mechanical Engineering
Semester : VI
Subject :Fatigue & Fracture Mechanics
Document type : Question Paper
Website : vardhaman.org
Download Previous / Old Question Papers :May- 2014 :https://www.pdfquestion.in/uploads/vardhaman.org/6410-BT6RMAY14.pdf
Vardhaman Fatigue & Fracture Mechanics Question Paper
Four Year B. Tech VI Semester Regular Examinations June – 2014
(Regulations: VCE-R11)
(Mechanical Engineering)
Date: 7 June, 2014
Time: 3 hours
Max Marks: 75
Related : Vardhaman College Of Engineering Aerospace Propulsion-II B.Tech Question Paper : www.pdfquestion.in/6406.html
Answer ONE question from each Unit
Unit – I
1. a) Write a note on:
i. Stress Concentration
ii. Notch Sensitivity
iii. Endurance Limit 6M
b) Explain with sketch “GOODMAN” method for combination of stresses and how it is useful in design? 9M
2. a) What information do you get from “SODERBERG” diagram? Explain? 9M
b) A Machine component is subjected to a flexural stress which fluctuates between +300MN/m2 and – 150 MN/m2. Determine the value of minimum ultimate strength according to:
i. Goodman Relation
ii. Soderberg Relation
Take yield strength=0.55 times Ultimate Strength, Endurance strength = 0.5 times Ultimate Strength and factor of safety=2 6M
Unit – II
3. a) State examples and explain low cycle fatigue and explain from the application point of view. 8M
b) Explain Coffin Mansion’s relation of fatigue behavior? 7M
4. a) Differentiate between:
i. Stress Intensity Factor
ii. Plane stress fracture toughness 8M
b) Explain how effect of notches on fatigue failure can be experimentally studied. 7M
Unit – III
5. a) With the help of a neat sketch explain the process of crack initiation and explain the stages of crack initiation. 8M
b) Explain the phenomenon of crack propagation? 7M
6. a) Explain Griffith’s theory and also compare this theory to Irwin- Orwin extension? 10M
b) Write short notes on strength of cracked bodies. 5M
Unit – IV
7. Explain in detail the effect of thickness on fracture toughness and also give examples as to how this value would be useful in industry scenario? 15M
8. Explain in detail citing examples as to how finite element approach is useful for crack propagation studies? 15M
Unit – V
9. Explain in detail the applications in composite material sector? 15M
10. a) Explain the different conditions that can cause the failure of a structural component? 8M
b) Explain experimental determination of Interlaminar toughness of a composite laminate? 7M
Finite Element Modeling & Analysis
(Aeronautical Engineering)
Date: 5 June, 2014
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only :
Unit – I :
1. a) Discuss in brief the general steps involved in the finite element method. 12M
b) Define degree of freedom. Explain the degrees of freedom for any two dimensional element. 3M
2. a) What is local coordinate and global coordinate system? Explain with an example? 5M
b) Derive relation between natural and Cartesian coordinate for a two dimensional triangular element in triangular coordinate system. 10M
Unit – II :
3. a) What is interpolation function? Explain its importance in finite element method with an example. 5M
b) Derive interpolation functions for two dimensional, 4 node rectangular element using Lagrange interpolation and sketch the interpolation plots. 10M
4. a) Define plane stress and plane strain condition for isotropic material. Derive [D] matrix for plane stress condition. 10M
b) Sketch local and global degrees of freedom of a truss element and list all its degrees of freedom. 5M
Unit – III :
5. a) Derive elemental stiffness matrix for 2 node one dimensional bar element using direct approach and list the properties of stiffness matrix. 10M
b) Explain the assembly process of global stiffness matrix with an example. 5M
6. a) Explain isoparametric, super parametric and sub parametric representation. 9M
b) Derive Jacobean matrix for a 3 node 2 D simplex element. 6M
Unit – V :
9. a) Explain structured and unstructured mesh generation. 7M
b) Write a note on commercially available FEA packages. 8M
10. a) List any 4 axial symmetric cases and sketch and explain any one case. 5M
b) Explain with a flow chart, pre-processor, solver and post processor. 10M