Sökning: "large scale yielding"

Visar resultat 1 - 5 av 43 avhandlingar innehållade orden large scale yielding.

  1. 1. Fatigue crack growth experiments and analyses - from small scale to large scale yielding at constant and variable amplitude loading

    Författare :Pär Ljustell; Fred L. Nilsson; Bo Alfredsson; Gunnar Härkegård; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fracture mechanics; fatigue crack growth; finite elements analysis; small scale yielding SSY ; large scale yielding LSY ; low cycle fatigue LCF ; crack tip opening displacement CTOD ; crack closure; potential drop method; constant amplitude load; variable amplitude load; inconel 718; stainless steel 316L;

    Sammanfattning : This thesis is on fatigue crack growth experiments and assessments of fatigue crack growth rates. Both constant and variable amplitude loads in two different materials are considered; a nickel based super-alloy Inconel 718 and a stainless steel 316L. LÄS MER

  3. 2. Complexity-aware Decision-making with Applications to Large-scale and Human-in-the-loop Systems

    Författare :Elis Stefansson; Karl H. Johansson; Henrik Sandberg; Iman Shames; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Complexity-aware Decision-making; Automata Theory; Automatic Control; Optimal Control; Kolmogorov Complexity; Hierarchical Finite State Machines; Large-scale Systems; Human-in-the-loop; Game Theory; Human Decision-making; Autonomous vehicles; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : This thesis considers control systems governed by autonomous decision-makers and humans. We formalise and compute low-complex control policies with applications to large-scale systems, and propose human interaction models for controllers to compute interaction-aware decisions. LÄS MER

  4. 3. Path Dependence and Path Shaping : Unearthing institutional dynamics in large-scale project organizing

    Författare :Ermal Hetemi; Cali Nuur; Sofia Pemsel; Anna Jerbrant; KTH; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; path dependence; path shaping; organisational lock-in; institutional field; knowledge work; Ledarskap; entreprenörskap och organisation; Ledarskap; entreprenörskap och organisation; Organisation theory; Organisationsteori; Industriell ekonomi; Industrial economy; Industriell ekonomi och organisation;

    Sammanfattning : Over the last two decades, large-scale project endeavors or major programs that typically deliver a substantial physical infrastructure or a complex product with a lifetime that can extend for decades and across industries have become the norm for many utility sectors, such as transport, energy, water, or food. The allure of ever-larger projects shows no sign of fading away in the face of sustainable development and grand societal challenges – quite the contrary. LÄS MER

  5. 4. Diaryliodonium Salts : Development of Synthetic Methodologies and α-Arylation of Enolates

    Författare :Marcin Bielawski; Berit Olofsson; Antonio Togni; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hypervalent Iodine Compounds; One-Pot Synthesis; Regiospecific Synthesis; Aromatic Substitution; Aryl Iodides; Arenes; Boronic Acids; Heteroaromatics; Arylations; Reaction Mechanisms; Density Functional Calculations; Large Scale Synthesis; Organic synthesis; Organisk syntes; organisk kemi; Organic Chemistry;

    Sammanfattning : This thesis describes novel reaction protocols for the synthesis of diaryliodonium salts and also provides an insight to the mechanism of α-arylation of carbonyl compounds with diaryliodonium salts.  The first chapter gives a general introduction to the field of hypervalent iodine chemistry, mainly focusing on recent developments and applications of diaryliodonium salts. LÄS MER

  7. 5. Caving mechanisms for a non-daylighting orebody

    Författare :Sraj Umar Banda; Jonny Sjöberg; Björn Nilsen; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sublevel caving; numerical analysis; laser scanning; seismic data; large-scale structure; rock mass characterization; failure mechanism; discontinuum modeling; continuum modeling; caving analysis; voronoi modeling; bonded block model; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

    Sammanfattning : The sublevel caving mining method is a mass production method with potentially very low operational costs. The success of this method is dependent on, among other factors, the cavability of the orebody and the overlying rock mass. LÄS MER