The origin of rheology
Although rheology only came to the scene after the end of the World War II, in one sense, it can be considered a very old science, with roots in antiquity.
What is now known as “rheology” could be traced back to the Greek philosopher Heraclitus and the Jewish prophetess Deborah (Deborah Number with the symbol De = time of RelaxationWhen a constant strain is applied to a rubber compound, the force necessary to maintain that strain is not constant but decreases with time; this behavior is known as stress relaxation. The process responsible for stress relaxation can be physical or chemical, and under normal conditions, both will occur at the same time. relaxation/time of observation). Later, “panta rhei” (everything flows) as the motto of rheology was introduced.
Rheology is as much about the deformation of solid-like materials as it is about the flow of liquid-like materials, and in particular, deals with the behavior of complex visco-elastic materials that show both solid and liquid-like properties in response to force.
Rotational Rheology: Interpretation of Data by Application
Our new booklet is helpful to understand how the flow properties of materials can be related to their rheological analysis. Even if your application isn’t mentioned, hopefully you’ll be inspired as to how a similar test method could be adapted to give an indication of your material’s properties in a specific process.
The basic concepts of rheology are explained, making this a small standard work, especially for beginners but also for advanced users. After the introduction, more than 100 pages are filled with measurements examples from the fields of paints, coatings and inks, polymers, food, pharmaceuticals and cosmetics, bitumen and petrochemical. Enjoy reading!