Ehlers, SörenSörenEhlers11599977990000-0001-5698-9354Randhawa, Kulbir SinghKulbir SinghRandhawa2018-05-292018-05-292018http://tubdok.tub.tuhh.de/handle/11420/1659Many 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.enhttp://rightsstatements.org/vocab/InC/1.0/icepolycrystallineultrasonicsound velocitymechanical propertiesYoung’s moduluscrackIngenieurwissenschaftenBachelor Thesisurn:nbn:de:gbv:830-8822089110.15480/882.165611420/165910.15480/882.1656Bock und Polach, Rüdiger Ulrich Franz vonRüdiger Ulrich Franz vonBock und PolachOther