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Announcing: Yerzley Mechanical Oscillograph (AYO-IV) at Innovations in Rubber Design Conference

Turkçe (PDFTurkce)

During the Innovations in Rubber Design Conference of IOM3, which is being held 7-8 December 2016 at 4 Hamilton Place, London, UK, an official from Tavdi Company Inc will be presenting the Yerzley Mechanical Oscillograph (AYO-IV).

The ASTM D11.10 subcommittee has incorporated the latest automation of the AYO-IV test method by Tavdi Company Inc into the D945-16 Standard.

AYO IV
Yerzley Mechanical Oscillograph (AYO-IV)

This instrument is completely computerized and equipped with the latest user-friendly software, eliminating all operator induced errors in data evaluation. No longer is there a need for graph paper, nor the required interpretation of the resulting graph; all calculations are automated so that results are available once the test is completed. A typical compression or shear test takes less than five seconds, after which the resulting trace and the calculated parameters are displayed at natural frequency of that sample.

An additional parameter, tangent of delta, the measure of energy loss due to damping, is also calculated and reported. AYO-IV predicts the mechanical properties of rubber, plastics and other polymers.

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Investigating Elastomeric Materials

Turkçe (PDFTurkce)

Contributed by: Maxim Myslivets and Elizabeth Burdakova, Russia

In this study we investigated elastomeric materials based on natural rubber used in the manufacture of rubber and rubber-metal vibration isolators. Basic anti-vibration properties were identified and stability over time was predicted. To achieve the objectives, tests were conducted on a mechanical oscilloscope Yerzley AYO-IV.

According to the research (Figure 1), we observed that replacement of the active carbon black N220 with high structural properties on the active carbon black К-354 and P-234 with a low index of structural in the ratio 1: 1 leads to a slight increase in such parameters as static and dynamic modules, hysteresis loss, and also to reduction of the coefficient of elasticity and vibration isolation.

Figure 1. Physical and mechanical properties of the elastomeric material based on natural rubber
Figure 1. Physical and mechanical properties of the elastomeric material based on natural rubber

To predict the stability of the main anti-vibration characteristics of the test material we were applied accelerated aging method according to GOST (Russian National Standard ) – 9.707 and method of prediction changes of properties during thermal aging according to GOST (Russian National Standard ) – 9.713.

According the results of the research we were constructed the graphics of combined curves (Figures 2, 3 and 4).

Picture 2 – Graph of the dependence of the logarithmic decrement of the elastomeric material from time
Figure 2. Dependence of the logarithmic decrement of the elastomeric material from time
Figure 3. Dependence of the static modulus of elastomeric material from time
Figure 3. Dependence of the static modulus of elastomeric material from time
Figure 4. Graph of the dependence of the hysteresis of the elastomeric material from time
Figure 4. Dependence of the hysteresis of the elastomeric material from time

The replacement of the active carbon black К-354 and P-234 on the active carbon black N220 in the elastomeric material based on natural rubber led to an increase in the stability of anti-vibration characteristics in the first years of using. However, lately no significant difference was observed.

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Optimum Carbon Black Level for Maximum Impact Energy in Rubber

Turkçe (PDFTurkce)

Contributed by: Dr. Sujitkumar Dutta

Not all rubber compositions are the same. It turns out that there is an optimum level of carbon black for maximum energy absorption capacity. One of our clients ran a series of tests on their Advanced Yerzley Oscillograph (AYO-IV) for Natural Rubber and Chloroprene Rubber at five different levels of carbon black. Their results show a definite maximum impact energy absorption level at 75 parts per hundred of rubber (PHR).

Impact Energy Graph for Carbon Black Level

Dynamic parameter tests are quick and easy on our Advanced Yerzley Oscillograph, taking just two to five seconds with results evaluated instantaneously.

From a single test cycle, we determine:

  • Hysteresis
  • Natural frequency
  • Static and dynamic moduli
  • Tangent of delta and other parameters

The Advanced Yerzley Oscillograph (AYO-IV) satisfies the requirements of ASTM D945-12 and can be viewed here.