Mechanical Behaviour of Materials Field of study: Biophysics
Programme code: W4-S2BFA21.2022

Module name: Mechanical Behaviour of Materials
Module code: W4-2BF-MB-21-04
Programme code: W4-S2BFA21.2022
Semester:
  • winter semester 2024/2025
  • winter semester 2023/2024
  • winter semester 2022/2023
Language of instruction: English
Form of verification: exam
ECTS credits: 6
Description:
1. Introduction to deformation behavior: Concept of stresses and strains, engineering stresses and strains, Different types of loading and temperature encountered in applications. 2. Tensile Test - stress-strain response for metal, ceramic, and polymer, elastic region, yield point, plastic deformation, necking, and fracture. 3. Bonding and Material Behaviour, theoretical estimates of yield strength in metals and ceramics. 4. Elasticity (the state of stress and strain, stress and strain tensor, tensor transformation, principal stress and strain, elastic stress-strain relation, anisotropy, elastic behavior of metals, ceramics, and polymers). 5. Viscoelasticity (Molecular foundations of polymer viscoelasticity. Rouse-Bueche theory, Boltzmann superposition principle, mechanical models, distribution of relaxation and retardation times, interrelationships between mechanical spectra, the glass transition, secondary relaxations, dielectric relaxations. 6. Plasticity (Hydrostatic and Deviatoric stress, Octahedral stress, yield criteria, and yield surface, texture and distortion of yield surface, Limitation of engineering strain at large deformation, true stress and true strain, effective stress, effective strain, flow rules, strain hardening, Ramberg-Osgood equation, stress-strain relation in plasticity, plastic deformation of metals and polymers). 7. Microscopic view of plastic deformation: crystals and defects, classification of defects, thermodynamics of defects, the geometry of dislocations, slip and glide, dislocation generation - Frank Read and grain boundary sources, stress and strain field around dislocations, force on dislocation - self-stress, dislocation interactions, partial dislocations, twinning, dislocation movement and strain rate, deformation behavior of single crystal, critical resolved shear stress (CRSS), deformation of poly-crystals, Hall-Petch and other hardening mechanisms, grain size effect - source limited plasticity, Hall-Petch breakdown, dislocations in ceramics and glasses. Effects of microstructure on the mechanics of polymeric media: deformation modes, yield, rubber toughening, alloys and blends. 8. Fracture mechanics (energetics of fracture growth, plasticity at the fracture tip, measurement of fracture toughness, -Linear fracture mechanics -KIC. Elasto-plastic fracture mechanics - JIC, Measurement and ASTM standards, Design based on fracture mechanics, the effect of environment, effect of microstructure on KIC and JIC. Application of fracture mechanics in the design of metals, ceramics, polymers and composites, damage tolerance design, elements of fractography) 9. Fatigue (S-N curves, low- and high-cycle fatigue, laboratory testing in fatigue, residual stress, surface and environmental effects, fatigue of cracked components, designing out fatigue failure, Life cycle prediction, Fatigue in metals, ceramics, polymers, and composites. 10. Creep. Creep in crystalline materials (stress-strain-time relationship, creep testing, different stages of creep, creep mechanisms and creep mechanism maps, diffusion, creep and stress rupture, creep under multi-axial loading, microstructural aspects of creep and design of creep resistant alloys, high-temperature deformation of ceramics and polymers.
Prerequisites:
(no information given)
Key reading:
(no information given)
Learning outcome of the module Codes of the learning outcomes of the programme to which the learning outcome of the module is related [level of competence: scale 1-5]
the students will be able to understand the mechanism of plastic deformation and the origin of materials strength [MB_04_1]
 KBF_W01 [4/5] KBF_W02 [4/5]
the students will be able to suggest ways by which engineering materials may be intrinsically strengthened [MB_04_2]
 KBF_U01 [4/5]
the students will be able to derive ductile-brittle transition temperature and select materials accordingly [MB_04_3]
 KBF_U01 [4/5] KBF_U07 [3/5]
the students will be able to understand the high-temperature mechanical behavior of materials and be able to select the materials for high-temperature applications [MB_04_4]
 KBF_W02 [4/5] KBF_U01 [4/5]
the students will be able to design and select engineering components based on the principles of fracture mechanics and fatigue [MB_04_5]
 KBF_W01 [4/5] KBF_W02 [4/5] KBF_W04 [4/5] KBF_U01 [4/5]
the students will be able to improve materials resistance to fracture and fatigue performance [MB_04_6]
 KBF_U01 [4/5]
Type Description Codes of the learning outcomes of the module to which assessment is related
exam [MB_04_w_1]
oral exam Requirement for examination: Knowledge of the mechanical behavior of a wide variety of materials ranging from conventional metals and alloys, ceramics and polymers to hybrid materials and biomaterials, at different length and time scales, from the continuum description of properties to the atomistic and molecular mechanisms that confer those properties to all materials. Knowledge of the micro-mechanics of deformation of metals, ceramics, polymers, and composites. Knowledge of the fundamentals of elasticity and viscoelasticity, plasticity, imperfections/defects in crystals, deformation and strain-hardening, fracture, strengthening of alloys, martensitic transformations
 MB_04_1 MB_04_2 MB_04_3 MB_04_4 MB_04_5 MB_04_6
Form of teaching Student's own work Assessment of the learning outcomes
Type Description (including teaching methods) Number of hours Description Number of hours
lecture [MB_04_fs_1]
Detailed discussion by the lecturer of the issues listed in the table "module description" using the table and/or multimedia presentations
 48
Supplementary reading, working with the textbook
 102 exam [MB_04_w_1]
Attachments
Module description (PDF)
Information concerning module syllabuses might be changed during studies.
Syllabuses (USOSweb)
Semester Module Language of instruction
(no information given)