Sökning: "impact damage"

Visar resultat 1 - 5 av 435 avhandlingar innehållade orden impact damage.

  1. 1. Damage Tolerance of Impacted Composite Sandwich Structures

    Författare :Moeen ud din Saeed Rajput; Malin Åkermo; Stefan Hallström; Magnus Burman; Christian Berggreen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; composite sandwich; cellular; polymer; material characterization; modulus; non-crimp fabric; low velocity impact; vibration; uncertainty analysis; drop-weight impact; fractography; barely visible impact damage; X-ray microtomography; compression-after-impact; bending-after-impact; high speed image processing; damage resistance; damage tolerance; Aerospace Engineering; Flyg- och rymdteknik;

    Sammanfattning : This thesis deals with damage tolerance of impacted sandwich structures for load bearing applications. Composite sandwich structures find wide application as lightweight solutions in aerospace components, since weight reduction and less fuel emissions are primary concerns for aircraft manufactures. LÄS MER

  3. 2. Geochronology of impact structures - constraining syn- and post-impact processes using the 40Ar/39Ar and U-Pb techniques

    Författare :Maria Herrmann; Berggrundsgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Impact structure; Dating impact events; 40Ar 39Ar dating; U-Pb dating; Siljan impact structure; Mien impact structure; Hummeln impact structure; Puchezh-Katunki impact structure;

    Sammanfattning : The discovery, at the beginning of the 20th century, that elements can transform into other elements, due to the spontaneous decay of an instable to a stable atomic nuclei, gave rise to a powerful source for age information in many fields of earth science. For impact structures, it is crucial to establish well-defined and precise ages in order to understand how impact events affect the Earth’s geo and biosphere and also with regard to possible future events that can have devastating effects on our civilization. LÄS MER

  4. 3. Failure of Sandwich Structures with Sub-Interface Damage

    Författare :Andrey Shipsha; KTH; []
    Nyckelord :sandwich structure; foam core; fatigue; crack growth; stress intensity factor; fatigue threshold; fracture toughness; damage tolerance; impact damage; crushed core; bridging; fracture analysis; point-stress criterion;

    Sammanfattning : .... LÄS MER

  5. 4. Windstorms in Sweden - variations and impacts

    Författare :Carin Nilsson; Institutionen för naturgeografi och ekosystemvetenskap; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; climate impact; geostrophic wind; Gudrun; Anatol; wind throw; forest damage; storm damage; Sweden; wind climate; windstorm;

    Sammanfattning : Windstorms have caused severe damage on several occasions in Sweden during the last century. A general concern about future projections of climate extremes has raised questions on the variations and impacts of windstorms. LÄS MER

  7. 5. De-icing salt and the roadside environment : Air-borne exposure, damage to Norway spruce and system monitoring

    Författare :Göran Blomqvist; KTH; []
    Nyckelord :road; de-icing salt; air-borne; environmental impact; vegetation damage; Norway spruce; seedling; follow-up; monitoring; indicator;

    Sammanfattning : After decades of investigation, we still have to deal withthe problem of environmental effects of the use of de-icingsalt on roads. Lacking useful indicators of the system, westill do not know the environmental utility of ameliorativemeasures taken. LÄS MER