Essays about: "ultrasonic spectroscopy"

Showing result 1 - 5 of 8 essays containing the words ultrasonic spectroscopy.

  1. 1. Quality Control in Aluminium Profiles : Non-destructive Methods using Non-linear Ultrasonic

    University essay from Blekinge Tekniska Högskola/Institutionen för maskinteknik

    Author : Viktor Svensson; Robin Raymundsson; [2023]
    Keywords : Acoustic; defect; detection; harmonic; Akustisk; defekt; detektion; överton;

    Abstract : When aluminium profiles are manufactured, defects may arise, especially when theprofiles are manufactured through extrusion. During the extrusion process, thesedefects occur on parts of the extruded material because of contaminates that needto be found. READ MORE

  3. 2. Characterization of surface defects caused by ultrasonic cleaning of aluminium

    University essay from Uppsala universitet/Tillämpad materialvetenskap

    Author : Emanuel Eriksson; [2022]
    Keywords : Ultrasonic cleaning; surface cleaning; metal; aluminium; 7050; 2050; defects; surface defects; Energy Dispersive Spectroscopy; Scanning Electron Microscopy; Vertical Scanning Interferometry;

    Abstract : This master thesis studies the behaviour of two aluminium alloys in ultrasonic cleaning at two different intensities, as well as the effect of a cleaning solution, Formula 815 GD-NF on the same surface have been studied with respect to surface roughness and material composition. Methods like Light Optical Microscopy (LOM), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and 3D topography using white light interferometry (VSI) was used to study the surface and material composition. READ MORE

  4. 3. 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

  5. 4. Examination of defects and long term crack growth in rolled bars during long term storage

    University essay from KTH/Materialvetenskap

    Author : Jon Scheutz; [2014]
    Keywords : Rolled bars; cracking; hydrogen damage; long term storage;

    Abstract : This work has had the purpose to examine defects and the cause of crack growth during long term storage in rolled bars. The bars in question are rolled and stored at Ovako in Hofors. The problem is approached by theoretically examining the possibilities of hydrogen damage, room temperature creep and naturally occurring porosity. READ MORE

  6. 5. Investigation of Methods to Detect Defects in Thin Layered Materials

    University essay from Blekinge Tekniska Högskola/Avdelningen för maskinteknik

    Author : Husam M. Hassan & Ajaykumar S. Chinthalapndi; [2005]
    Keywords : Thin layered materials; NDT; Vibration based; Air coupled ultrasonic; Acoustic microscopy; Ultrasonic spectroscopy; Shearography; and;

    Abstract : Cost effective and reliable damage detection is critical for the utilization of thin layered materials and microstructures. This Thesis presents a brief overview of conventional NDT methods and the usage of unconventional NDT methods applicable to thin layered materials, and the conclusion of applicability of these methods for damage detection in thin layered materials. READ MORE