UPH006 - MECHANICAL PROPERTIES OF MATERIALS

 

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Course Objectives: To understand the materials behavior under applied stress and the mechanism involved in the material deformations and strengthening with various mechanical testing methods.                                                                      

 

Introduction:  Intrinsic and extrinsic, structure sensitive and structure insensitive properties.

 

Elastic Behavior of Metals, Ceramics, Composites and Elastomers:  Stress and strain, atomic model, elastic constants, thermal and alloying effects, anisotropy, analysis of composites, yielding and yield criteria.

 

Dislocation in Crystals: Type, properties of dislocation, generation of dislocation, partial dislocation, stacking faults, motion of dislocations (climb, cross-slip), strain hardening and recovery, structure of high, low angle and twin boundaries.

 

Modes of Deformation: Plastic Deformation: Slip planes and directions, shear stress, theoretical shear strength of crystals, strain hardening and recovery, twining. Cold working, Recovery, recrystallization and grain growth

 

Fracture of Materials: Brittle and ductile fracture, creep failure, fatigue, development of creep and fatigue resistant materials, brittle failures in ceramics, glasses and polymers.

 

Strengthening Mechanisms: Solid solution strengthening, Work hardening, precipitation hardening, dispersion hardening, grain refinement.

 

Mechanical Testing: Tensile testing, hardness testing, impact testing, fatigue testing.

 

Laboratory Work:

To study the stress-strain curves of different metallic samples using tensometer, Deformation by creep in metals, Hardenability of steel by Jominy end quench test method, Mechanical behavior/strength of glass, Rockwell, Brinell hardness of metallic samples Hardness of a specimen by Vickers micro hardness tester, Wear behavior of a given metallic materials.

 

Project: Students will work on a project on mechanical properties of different types of solids.

Course Learning Outcomes (CLO):

Student will be able to:

1.      describe and predict elastic deformation in isotropic and anisotropic engineering materials;

2.      describe and predict yielding of engineering materials under uniaxial and multiaxial states of stress;

3.      describe the major microstructural-based mechanisms of strengthening in (crystalline) materials, and apply these principles to alloy and process design;

4.      identify the microstructural based dependencies of mechanical failure in engineering materials, including yielding, fracture, fatigue, and creep; and apply these principles to design and process failure-resistant materials.

Text Books:

1.      G.E. Dieter, Mechanical Metallurgy; McGraw-Hill (1988).

2.      Thomas H. Courtne, Mechanical Behaviour Materials, McGraw Hill (1990).

 

Reference Books:

1.      V. Raghavan, Materials Science and Engineering; PHI Learning Pvt. Ltd. (2004).

2.       Howard A. Kuhn Mechanical Testing and Evaluation; ASM International 2000.

3.      W.D. Callister. Jr., Materials Science & Engineering: An Introduction; John Wiley and Sons, 2009.