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Stimuli responsive polymersomes: Small Angle Neutron Scattering studies
May 27 14:30 - 15:30
- Diblock copolymers can self-assemble in solution in stable and robust polymersomes (vesicles),...
To deuterate or not to deuterate? That is the question
June 03 14:30 - 15:30
- Accepted wisdom when performing diffraction experiments with neutrons is to deuterate the...
Static and dynamic properties of a strong-leg spin-ladder
June 17 14:30 - 15:30
- The AF S = 1/2 Heisenberg spin ladder belongs to the simplest quantum magnets, yet disclosing the...
Inner stresses are mechanical stresses of a component part that exist without external load or momentum. Therefor inner stresses are in mechanical equilibrium in the component under consideration in view of the originating forces. They compensate each other on a macroscopical level with respect to any surface or axes through the component.
The resulting stress of a component arises from the superposition of external load and inner stresses of the component part. The inner stresses influences the stiffness, the live time due to cyclic load as well as the resistivity against stress corrosion cracking.
In contrast to other methods the study of inner stresses is possible deep into the component part by means of neutron beams. The analysis of inner stresses with neutrons provides absolute and phase distinguished values of stresses. Here atomic distances are determined in a well defined volume in all three directions in space and compared to the one of a stress relieved reference part. From the relative
changes of atomic distances and the measurement of a large number of sample volumes the stress of the component part can be determined in three dimensions.
The texture of a workpiece describes the distribution of the crystallographic orientation of all grains in a polycrystalline material in relation to a well defined axis of the workpiece. Especially for plastic deformations like forging, rolling or deep drawing the anisotropic of mechanical properties imposed by texture is of major importance. The determination of a texture comprises typically the measurement of several pole figures, depending on the crystal structure and the shape of the workpiece. Again, the high penetration depth of neutrons is advantageous to obtain detailed information about the texture of a workpiece.