Filtern
Erscheinungsjahr
Dokumenttyp
- Zeitschriftenartikel (24)
- Posterpräsentation (14)
- Vortrag (13)
- Beitrag zu einem Sammelband (7)
- Beitrag zu einem Tagungsband (6)
Schlagworte
- Interface (5)
- Adhäsion (4)
- Haftung (4)
- Reibung (4)
- Verbundwerkstoffe (4)
- Adhesion (2)
- Coating (2)
- Interface/interphase (2)
- SFM/AFM (2)
- Surface properties (2)
Eingeladener Vortrag
- nein (13)
Viscoelastic properties of the interphase in fibre reinforced polymers - measurement and simulation
(1999)
Scanning force microscopy (SFM) has been used to assess the local mechanical properties of fibre-reinforced polymers. Using a sinusoidal displacement modulation (DM) and lock-in technique the method allows to characterize local viscoelastic properties with a high lateral resolution. The simultaneous measurement of the local electrical conductivity is proposed which facilitates the interpretation of the mechanical data. The investigation of cross-sections perpendicular to the axis of carbon fibres embedded in PPS delivers some information about the change in local stiffness within the interfacial region. As a first approach, assuming a single-exponential decrease in local stiffness along a radial line from fibre to polymer we find characteristic decay lengths which are distributed in a range between 20 and 80nm. Further, a modified DM-mode is proposed which is expected to provide a contrast enhancement of the signal which is related to local stiffness. This can be achieved by installing an additional feedback loop which keeps constant the amplitude of dynamic indentation (CDI-mode).