Dokumenttyp/Document type
Sida/Page
1 (1)
Template for thesis proposal
Titelförslag/Thesis title
Ämnesområde/Business area
Evaluation of uncertainty of crack propagation
models
Tidsperiod och högskolepoäng/Period of time and amount of credits
20 weeks,
Antal studenter/Number of students
1
Geografisk placering/Location
Kontaktperson/Contact person
Trollhättan
Språk/Language
Startdatum/Start date
English/Swedish
Handledare/Supervisor
Thomas Hansson Tomas Månsson
Avdelning/Department
9633
Skicka ansökan till/Send application to
Sista ansökningsdag/Last application date
Tomas.mansson@gknaerospace.com
Om oss/About us
GKN Aerospace is the aerospace operation of GKN plc, serving a global customer base and operating in North America and Europe. With sales of
£1.5 billion in 2011, the business is focused around three major product areas - aerostructures, engine products and transparencies, plus a number
of specialist products - electro-thermal ice protection, fuel and flotation systems, and bullet resistant glass. The business has significant
participation on most major civil and military programmes. GKN Aerospace is a major supplier of integrated composite structures, offers one of the
most comprehensive capabilities in high performance metallics processing and is the world leading supplier of cockpit transparencies and passenger
cabin windows.
Bakgrund till examensarbetet/Background of thesis project
Fatigue crack propagation analyses are commonly used to decide consequence of accidental damages, manufacturing quality and for critical areas
of the engine. The analysis are based on fracture mechanics methods and applied to analyze the number of load reversals until an initially safe crack
size have grown until a critical size. The analysis rests heavily on the crack growth rate i.e. crack growth increment per load cycle. The crack growth
increment is next fit an equation designed to mimic the measured crack growth rate. As all material tests uncertainty in the testing procedure,
material and evaluation procedure influence the quality of the obtained crack growth model and a conservative estimate is typically obtained. To
allow for probabilistic crack growth analyses it is relevant to investigate the various sources of error in the resulting crack growth model.
Uppdragsbeskrivning/Assignment description
The thesis work will focus on three areas



Understanding the testing procedure and estimate uncertainties in test set-up
understanding the evaluation procedure and estimate uncertainties
Numerical simulations to calculate total uncertainty of crack propagation material models
Mål/Target

Quantify uncertainties in crack propagation testing and modelling
Kvalifikationer/Qualifications


Master
Strong interest in numerical simulations and material science
Ansök genom att/Apply by
5972 Utg 4

Förslagsvis genom att skicka in CV och personligt brev/for instance by sending CV and personal letter, etc.