ADVANCED YERZLEY OSCILLOGRAPH
AYO-IV Testing Machine for Rubber Properties in Compression and Shear
OVERVIEW
AYO-IV predicts the mechanical properties of rubber, plastics and other polymers in small range of deformations. ASTM D 945-06 test method calls for the use of AYO-IV to characterize the mechanical properties such as initial creep, initial set, impact energy, frequency, effective dynamic modulus, point modulus, static (tangent) modulus, Yerzley Resilience and Yerzley hysteresis. These properties are evaluated at deformations of 20% or less for those materials, which may have the maximum static moduli of 280 psi (2 MPa) under compression or 140 psi (1 MPa) under shear stresses.
The principle of operation of AYO-IV is that of simple harmonic motion: properties of the material under test are derived from the analysis of the vibrational frequency and the damping rate of the free oscillations, which follow the initial known potential energy applied to the test sample.
APPLICATIONS
AYO-IV is readily adaptable to extensive mechanical testing of rubber, plastics, coil and other springs, shock absorbers, and damping devices in relation to quality assurance and R & D investigations. It may also determine creep and set of materials under dead load and measure consistency or flow of viscous and putty-like materials.
ARTICLE
The Yerzley Oscillograph Revisited (To download the PDF file and read the entire article Click Here)
by Dr. Nuri Akgerman, Camtech Consulting, Dr. Ismail Saltuk, Tavdi Corp, January 2011
Abstract
Yerzley Oscillograph is the testing equipment specified in ASTM Standard D945-06 for
determining static and dynamic mechanical properties of rubber and rubber like materials.
The present version of the device has been improved with automated data acquisition and
evaluations as well as including a calibration method and the addition of tan d calculation.