Description
The aim of this unit is to continue covering the topics discussed in Unit 9: Mechanical Principles. It will provide students with advanced knowledge of the mechanical theories associated with engineering applications.
Topics included in this unit are: Poisson’s Ratio and typical values of common materials; the relationship between the elastic constants such as Bulk Modulus, Modulus of Elasticity, Modulus of Rigidity; the relationship between bending moment, slope and deflection in beams; calculating the slope and deflection for loaded beams using Macaulay’s method; analysing the stresses in thin walled pressure vessels; and stresses in thick-walled cylinders, flat and v-section belt drive theory.
On successful completion of this unit students will be able to have more advanced knowledge of mechanical principles to determine the behavioural characteristics of materials subjected to complex loading; assess the strength of loaded beams and pressurised vessels; determine specifications of power transmission system elements; and examine operational constraints of dynamic rotating systems.
Learning Outcomes
By the end of this unit students will be able to:
1. Determine the behavioural characteristics of materials subjected to complex loading.
Characteristics of materials:
Definition of Poisson’s Ratio and typical values of metals, plastics and composite materials
The relationship between the elastic constants such as Bulk Modulus, Modulus of Elasticity, Modulus of Rigidity and Poisson’s Ratio
Characteristics of two-dimensional and three-dimensional loading
Calculation of volumetric strain and volume changes
2. Assess the strength of loaded beams and pressurised vessels.
Strength:
The relationship between bending moment, slope and deflection in beams
Calculating the slope and deflection for loaded beams using Macaulay’s method
Analysing the stresses in thin-walled pressure vessels and stresses in thick-walled cylinders
3. Analyse the specifications of power transmission system elements.
Specifications:
Flat and v-section belt drive theory
Operation of friction clutches with uniform pressure and uniform wear theories
Principles of both epicyclic and differential gearing, and the torque required to accelerate these systems
Areas of failure when transmitting power mechanically
4. Examine operational constraints of dynamic rotating systems.
Operational constraints:
Design of both radial plate and cylindrical cams to meet operating specifications
Operating principles of flywheels to store mechanical energy
Balancing of rotating mass systems
The effects of coupling on freely rotating systems