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Showing result 1 - 5 of 11 essays matching the above criteria.

1. 1. Development of thick GaN and AlGaN drift layers for vertical power devices

   University essay from Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

   Author : Andri Dhora; [2023]
   Keywords : Technology and Engineering;

   Abstract : High-quality, thick III-nitride epitaxial drift layers with controlled doping are needed for next-generation highly efficient vertical power devices for a smart grid applications and electrification of mobility. Achieving desirable material properties, such as low background impurity concentrations and reduced dislocation densities in combination with high growth rates, necessary for practical application present a challenge. READ MORE

3. 2. Fatigue Crack Growth Analysis in Python algorithm with Finite Element Methods : Numerical Simulation of Fatigue Crack Growth

   University essay from Karlstads universitet

   Author : Hasan Majid; [2022]
   Keywords : ;

   Abstract : The goal of this thesis was to construct and develop a python-based finite element computer program for the evaluation of fatigue crack growth rate in notched metallic rods. The simulation was done by implementing elastic stress theory and linear elastic fracture mechanics techniques. READ MORE

4. 3. Energy and Strength-based Criteria for Intralaminar Crack Growth in Regions with High Stress Gradients

   University essay from Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

   Author : Anish Niranjan Kulkarni; [2021]
   Keywords : Cross-ply composites; High crack density; Stress gradient; FEM; Stress analysis; Strain Energy Release Rate;

   Abstract : Cross-ply composite laminates can develop very high density of transverse cracks in the 90-layer under severe thermal and mechanical loading conditions. At such high crack densities, two adjacent cracks start to interact, and a stress gradient is created in the region between these cracks. READ MORE

5. 4. Life and fracture in very high cycle fatigue of a high strength steel

   University essay from Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik (from 2013)

   Author : Daniel Karlsson; [2021]
   Keywords : Very high cycle fatigue; VHCF; Fractography; Fine granular area; FGA; High strength tool steel; Ultrasonic testing equipment;

   Abstract : Classical fatigue models teach that there is an intrinsic fatigue limit for steels, representing a level of stress that is too low for regular crack growth where every cyclic load propagates a fatigue crack through the material. Modern application with extreme lifetimes has shown that fatigue will still take place in steels with stress levels well below the expected fatigue limit. READ MORE

6. 5. Infuence of matrix and alloying on the fatigue crack propagation and fracture toughness of compacted graphite iron for cylinderheads

   University essay from Linköpings universitet/Konstruktionsmaterial

   Author : Leny Gonzalez; [2020]
   Keywords : compacted iron cylinder head fracture toughness fatigue crack propagation alloying;

   Abstract : The constants modernization in the fuels used request improvements in the combustioneffectiveness, as a consequence the material for components as the cylinder heads mustenhance their properties. Seven different compositions of compacted graphite iron (CGI)are analysed with the aim of characterized and select the most suitable material for thecylinder head service condition. READ MORE