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Dynamic mechanical analysis (abbreviated DMA) is a technique used to study and characterize materials.It is most useful for studying the viscoelastic behavior of polymers.A sinusoidal stress is applied and the strain in the material is measured, allowing one to determine the complex modulus.
e. Polymer characterization is the analytical branch of polymer science. The discipline is concerned with the characterization of polymeric materials on a variety of levels. The characterization typically has as a goal to improve the performance of the material. As such, many characterization techniques should ideally be linked to the desirable ...
The time–temperature superposition principle is a concept in polymer physics and in the physics of glass-forming liquids. [1][2][3] This superposition principle is used to determine temperature-dependent mechanical properties of linear viscoelastic materials from known properties at a reference temperature.
The stresses in a structure can be determined by making a model of the structure from such a photoelastic material. Dynamic mechanical analysis (DMA) is a technique used to study and characterize viscoelastic materials, particularly polymers. The viscoelastic property of a polymer is studied by dynamic mechanical analysis where a sinusoidal ...
Dynamic modulus. Dynamic modulus (sometimes complex modulus[1]) is the ratio of stress to strain under vibratory conditions (calculated from data obtained from either free or forced vibration tests, in shear, compression, or elongation). It is a property of viscoelastic materials.
The worm-like chain (WLC) model in polymer physics is used to describe the behavior of polymers that are semi-flexible: fairly stiff with successive segments pointing in roughly the same direction, and with persistence length within a few orders of magnitude of the polymer length. The WLC model is the continuous version of the Kratky – Porod ...
The Williams– Landel – Ferry Equation (or WLF Equation) is an empirical equation associated with time–temperature superposition. [1] The WLF equation has the form. where is the decadic logarithm of the WLF shift factor, [2] T is the temperature, Tr is a reference temperature chosen to construct the compliance master curve and C1, C2 are ...
Polymer fracture is the study of the fracture surface of an already failed material to determine the method of crack formation and extension in polymers both fiber reinforced and otherwise. [1] Failure in polymer components can occur at relatively low stress levels, far below the tensile strength because of four major reasons: long term stress ...