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	Language / Jazyk: DTMA2011 Course Outline Program of the course can be downloaded as a pdf file. No. Topic Dates Lecturers Content Hours Days 1 Introduction Mar 1, 2011 - 9:00 - Mar 1, 2011 - 16:00 Jan Papuga, Milan Růžička Course outline and focus; history of research related to fatigue, its application in development of components; factors affecting the strength and durability of structures; failure types, their combinations; non-destructive inspections and testing; criteria of fatigue design; Damage Tolerance approach history; current state; circular CS 25, paragraph CS 25.571; safe-life certification, damage tolerance certification acc. to CS 25. 5 1 2 Fatigue Mar 2, 2011 - 9:00 - Mar 2, 2011 - 16:00 Jan Papuga, Milan Růžička Stress and strain under cyclic loading; change of material response during cycling; hard and soft loading; cyclic stress-strain curve; S-N curve; Manson-Coffin curve; Basquin curve; stress-based fatigue analysis and factors to be included; mean stress effect; notch effect; damage cumulative rule; rain-flow; strain-based fatigue prediction; damage parameter; focus of the analysis: low-cycle v. high-cycle fatigue; fatigue limit; giga-cycle fatigue; multiaxial loading; multiaxial fatigue analysis; thermal effects. 5 1 3 Fracture Mechanics and Fractography Mar 16, 2011 - 9:00 - Mar 17, 2011 - 16:00 Jiří Kunz, Aleš Materna, Jan Siegl Linear fracture mechanics; stress intensity factor; modes of crack front loading; brittle fracture; correction functions, FEA-models calibration; linear superposition; fracture toughness and factors that affect it; ductile fracture; non-linear fracture mechanics; plastic zone around the crack front; J-integral, R-curves; COD concept; fatigue crack growth and factors that affect it – stress redistribution, plastic zone, loads interaction, crack closure and opening; crack growth under multiaxial loading; short cracks growth; relation between fatigue limit and SIF threshold; relation between SIF threshold and notch factor; applicable software, its usability for specific problems; inspections and their intervals; setting the safe inspection interval; fractographic analysis of fracture surface; crack growth reconstruction for constant and variable amplitude loading; marking of fracture surface. 10 2 4 Reliability & NDT Methods Mar 23, 2011 - 9:00 - Mar 24, 2011 - 16:00 Jiří Běhal, Marie Boháčová, Gejza Dohnal, Petr Kopřiva Statistic distributions, their parameters; statistical processing of experimental measurements – examples; probabilistic content of reliability factors; deterministic v. stochastic solution; design with a failure probability; simulation methods; hypotheses testing; probability of defect detection; methods for PoD curves evaluation, examples of their practical application; comparison of individual methods and their aspects (demand factor; applicability; price; predicative value); stress redistribution analysis; visual inspections; penetration fluids; ultrasonic detection; X-ray detection; magnetostrictive methods; methods using vacuum; strain-gauging; optical fibres; piezo-sensors; acoustic emission; thermo-sensitive methods; modern optical methods (holography); analysis of dynamic response; piezo-actuators; transition to SHM (Structural Health Monitoring), its main aspects. 10 2 5 Metallic Structures Apr 20, 2011 - 9:00 - Apr 20, 2011 - 17:00 Bianka Schmidt-Brandecker, Očenášek Vladivoj Materials used for metal aircraft structures; their static and fatigue properties; certification of materials; material databases; examples of designs and their applicability within DT; multiple load paths; difference between fail-safe and damage tolerant approaches; aspect of failure detectability; crack stoppers; crack front branching; analysis of available materials used in aircraft industry as regards DT; availability of material data; primary members identification in the airframe; damage extent; inaccessible parts and joints, tests of primary structure parts; material or supplier replacement evaluation. 6 1 6 Composites, Their Analyses Apr 27, 2011 - 9:00 - Apr 27, 2011 - 17:00 Bohuslav Cabrnoch, Radek Doubrava, Alastair Johnson Differentiation of composites; composites with long fibres; fiber and matrix types; production technology; composite micromechanics; elastic moduli; anisotropy; orthotropy; isotropy; fibre-glass, lay-up, marking; lamina strains and stresses; strength criteria; introduction to classic lamination theory; stresses and strains in fibre-glass; spring-back effects; fibre-glass failures, delamination; fatigue of composites, stiffness degradation; experimental strain analysis; optical methods, ultrasonic measurement; FEA-modelling of composite structures; sandwich structures; analysis of sandwiches. 6 1 7 Composite Structures Apr 28, 2011 - 9:00 - Apr 28, 2011 - 17:00 Alastair Johnson, Roman Růžek Materials used for composite aircraft structures; their static and fatigue properties; certification of materials; examples of designs and their applicability within DT; aspect of failure detectability; differences in failure modes between metals and composites; analysis of available materials used in aircraft industry as regards DT; availability of material data; joining metal and composite materials – bonding, riveting, bolts, combined joints; sandwich structures; damage identification, design principles when dealing with composites; DT aspects of the composite use; impact tests; numerical simulation; certification of a structure with defects; damage extent; inaccessible parts and joints. 6 1 8 DT – knowledge integrating, practicing May 4, 2011 - 9:00 - May 5, 2011 - 17:00 Hans-Jürgen Schmidt, Bianka Schmidt-Brandecker Overview of typical parts DT certified by European aircrafts; statistics and results of inspections; example of DT certification of a metal sample; application of computational tools; experimental campaign; certification procedure; extent of tests; NDT system; in-service actions; example of DT certification of a composite sample, differences in the certification and experimental procedure; SHM systems; workshop in teams designing specific parts, analysis of existing structures; identification of evaluated areas; admissible damage analysis; inspections; certification of typical parts, DT applicability on various parts of aircraft structures. 12 2 papuga@pragtic.com, last update: 18-01-2011