The measurement of the Young's modulus of ice with ultrasonic waves

Medientyp: E-Book; Hochschulschrift

Titel: The measurement of the Young's modulus of ice with ultrasonic waves

Beteiligte: Randhawa, Kulbir Singh [VerfasserIn]; Ehlers, Sören [AkademischeR BetreuerIn]; Bock und Polach, Rüdiger U. Franz von [AkademischeR BetreuerIn]

Körperschaft: Technische Universität Hamburg ; Technische Universität Hamburg, Institut für Konstruktion und Festigkeit von Schiffen

Erschienen: Hamburg, 2018

Umfang: 1 Online-Ressource (XIV, 57 Seiten, 5 ungezählte Seiten); Illustrationen, Diagramme

Sprache: Englisch

DOI: 10.15480/882.1656

Identifikator:

Schlagwörter: ice ; polycrystalline ; ultrasonic ; sound velocity ; mechanical properties ; Young’s modulus ; crack ; Hochschulschrift

Entstehung:

Hochschulschrift: Bachelorarbeit, Technische Universität Hamburg, 2018

Anmerkungen:

Beschreibung: Many techniques have been used to measure the Young’s modulus of ice. The purpose of this bachelor thesis is to develop a more effective and precise technique. The impulse-echo method has been used to measure the longitudinal ultrasonic velocities of three different types of specimens. From this, the Young’s modulus has been calculated. The specimens included homogeneous, inhomogeneous and a cracked polycrystalline ice Ih sample. The homogenous samples studied were found to be elastic isotropic, whereas the inhomogeneous and cracked sample were found to have an anisotropic elastic behaviour. For the cracked specimen, different decreases of the Young’s moduli were measured in different directions. The results showed an overall scatter and gives therefore only temporary and rough values for the longitudinal sound velocity in a homogenous polycrystalline ice specimen. Further, the applied method is applicable to detect different types of ice with different composites and manufacturing, and to identify a change of elastic properties after crack.

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