Sökning: "voids."

Visar resultat 16 - 20 av 126 avhandlingar innehållade ordet voids..

  1. 16. Closed-die forging and slab hot rolling with focus on material yield : some industrial problems analysed by FEM

    Författare :Esa Ervasti; Ulf Ståhlberg; Hans Keife; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material yield; Closed-die forging; Hot rolling; Cracks; Macro-inclusions; Steel; FEM; Industrial engineering and economy; Industriell teknik och ekonomi;

    Sammanfattning : The thesis is focussed on improving the material yield in closed-die forging and rolling. The former is restricted to the manufacturing of heavy crown wheels and front axle beams and the latter to the hot rolling of steel slabs. To enhance the yield the commercial FE-codes Form2D and Dyna3D are used. LÄS MER

  3. 17. Experiments and numerical modelling of the SMC and autoclave processes

    Författare :Jimmy Kluge; Andy George; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : The work presented in this thesis focus on the flow taking place in two industrialmanufacturing methods for composite manufacturing. The first method underinvestigation is compression moulding of Sheet Moulding Compound (SMC). LÄS MER

  4. 18. A multiscale approach for predicting freeze-thaw damage in asphalt mixtures

    Författare :Lisa Lövqvist; Nicole Kringos; Romain Balieu; Markus Oeser; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Byggvetenskap; Civil and Architectural Engineering; Structural Engineering and Bridges; Bro- och stålbyggnad;

    Sammanfattning : Cold and wet climates are a known threat to asphalt pavements, causing both an embrittlement of the material, making it more prone to failure, and increasing the risk of damage due to the presence of moisture in the material and freeze-thaw cycles causing expansion and contraction of the air voids as the moisture inside them freezes and thaws. This damage evolution can lead to an overall decrease of material properties and ultimately showcase itself as raveling, pot holes,and cracks. LÄS MER

  5. 19. Recintare/Delimitare,  un  nuovo  "materiale"  della  composizione urbana : [Il tessuto di recinti come proposta di un possibile modo di intervenire sulle aree indefinite della città contemporanea]

    Författare :Maria Luna Nobile; Roberta Amirante; Ilaria Valente; Andrea Sciacia; Giovanni Galli; Politecnico di Milano; []
    Nyckelord :HUMANIORA; HUMANITIES; Contemporary city; urban strategies; re-use; urban regeneration; industrial heritage;

    Sammanfattning : The research topic investigates the role of the "enclosures" in the contemporary city. Observing the city, its voids and its paths, in particular the peripheral areas of the contemporary city, it is possible to notice how many of its spaces are completely inaccessible and closed between "fences". LÄS MER

  7. 20. Compression moulding of SMC : experiments and simulation

    Författare :Jimmy Olsson; Daniel Ståhlberg; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : Due to excellent properties and relatively low material and manufacturing costs, the use of fibre reinforced polymer composites have increased during the last decades. One method that is suitable for large scale productions of e.g. lightweight vehicle components is compression moulding of sheet moulding compound (SMC). LÄS MER