Sökning: "material failure"

Visar resultat 1 - 5 av 436 avhandlingar innehållade orden material failure.

  1. 1. On failure modelling in finite element analysis material imperfections and element erosion

    Detta är en avhandling från Institutionen för konstruktions- och produktionsteknik

    Författare :Mattias Unosson; Linköpings universitet.; Linköpings universitet.; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; finite element method; element erosion; material failure; material imperfections; crack-tip; TECHNOLOGY Engineering mechanics Solid mechanics; TEKNIKVETENSKAP Teknisk mekanik Fastkroppsmekanik;

    Sammanfattning : This dissertation concerns failure modelling with material imperfections and element erosion in finite element analyses. The aim has been to improve the element erosion technique, which is simple to use and implement and also computationally inexpensive. LÄS MER

  2. 2. Long-Term Tracheostomy : Outcome, Cannula care, and Material Wear

    Detta är en avhandling från Stockholm : Karolinska Institutet

    Författare :Gunilla Björling; Sophiahemmet Högskola.; Karolinska Institutet.; Karolinska Institutet.; [2007]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; tracheostomy; long-term care; INTERDISCIPLINARY RESEARCH AREAS Caring sciences Nursing; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN Vårdvetenskap Omvårdnad; Long-term tracheostomy; Respiratory failure; Hospital care; Tracheostomy care; Decontamination; Trachestomy tube; Material degradation; Polymeric material; Health-related quality of life; Long-term tracheostomy; respiratory failure; hospital care; tracheostomy care; decontamination; tracheostomy tube; material degradation; polymeric material; and health-related quality of life;

    Sammanfattning : Do people with long-term tracheostomy need hospital care? Which cleaning method is most appropriate for decontamination of inner cannulae? Are tracheostomy tubes changed for rational reasons? There is clearly a lack of evidence based research in this field and the clinical guidelines available are often based on local practice. A tracheostomy is a created opening in trachea to facilitate breathing. LÄS MER

  3. 3. Modelling of Forming and Welding in Alloy 718

    Detta är en avhandling från Luleå : Luleå University of Technology

    Författare :Lluís Pérez Caro; Luleå tekniska universitet.; [2017]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Forming; welding; Alloy 718; damage; GISSMO; failure; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : The reduction of fuel consumption and carbon dioxide emissions are currently a key factor for the aviation industry due to major concerns about climate change and more restrictive environmental laws. One way to reduce both fuel consumption and CO2 emissions is by significantly decreasing the vehicle’s weight while increasing engine's efficiency. LÄS MER

  4. 4. Modelling Aspects in Forming and Welding of Nickel-Base Superalloys

    Detta är en avhandling från Luleå : Luleå University of Technology

    Författare :Lluís Pérez Caro; Luleå tekniska universitet.; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; alloy 718; Haynes 282; cold forming; hot forming; material characterization; GISSMO; welding; heat treatment; manufacturing chain; springback; shape distortions; dynamic strain aging; DSA; microstructure; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : The reduction of fuel consumption and carbon dioxide emissions are currently a key factor for the aviation industry because of major concerns about climate change and more restrictive environmental laws. One way to reduce both fuel consumption and CO2 emissions is by significantly decreasing the weight of vehicles while increasing the efficiency of the engine. LÄS MER

  5. 5. As-cast AZ91D magnesium alloy properties Effects of microstructure and temperature

    Detta är en avhandling från Jönköping : Jönköping University, School of Engineering

    Författare :Hoda Dini; Högskolan i Jönköping.; Högskolan i Jönköping.; [2017]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Magnesium; Magnesium Alloy; AZ91D; High-Pressure Die-Casting; Mechanical Property; Microstructural Characterisation; Physical Modelling; Dislocations; Distortion; Residual Stress; Magnesium; Magnesiumlegering; AZ91D; Pressgjutna; Mekanisk Egenskap; Mikrostrukturkarakterisering; Fysikalisk Modellering; Flytspänning; Dislokationer; Geometrisk Tolerans; Restspänning;

    Sammanfattning : Today, there is an essential need for lightweight, energy-efficient, environmentally benign engineering systems, and this is the driving force behind the development of a wide range of structural and functional materials for energy generation, energy storage, propulsion, and transportation. These challenges have motivated the use of magnesium alloys for lightweight structural systems. LÄS MER