RU2000109769A - METHOD FOR DETERMINING THE RELAXATION TIME OF A FLEXIBLE VISCOELASTIC ELASTIC ELEMENT (OPTIONS) - Google Patents
METHOD FOR DETERMINING THE RELAXATION TIME OF A FLEXIBLE VISCOELASTIC ELASTIC ELEMENT (OPTIONS)Info
- Publication number
- RU2000109769A RU2000109769A RU2000109769/28A RU2000109769A RU2000109769A RU 2000109769 A RU2000109769 A RU 2000109769A RU 2000109769/28 A RU2000109769/28 A RU 2000109769/28A RU 2000109769 A RU2000109769 A RU 2000109769A RU 2000109769 A RU2000109769 A RU 2000109769A
- Authority
- RU
- Russia
- Prior art keywords
- relaxation time
- sample
- oscillations
- pendulum
- flexible
- Prior art date
Links
- 230000001133 acceleration Effects 0.000 claims 2
- 230000005484 gravity Effects 0.000 claims 2
- 230000005284 excitation Effects 0.000 claims 1
- 239000000725 suspension Substances 0.000 claims 1
Claims (2)
где τ1,2 - два возможных значения времени релаксации;
m - масса груза, подвешенного на исследуемом образце;
g - местное ускорение свободного падения;
l - длина исследуемого образца гибкого элемента;
EF - жесткость исследуемого образца на растяжение;
к - параметр, определяющий темп затухания маятниковых колебаний, вычисляемый по формуле
где А0 - начальная амплитуда маятниковых колебаний;
Ак - конечная амплитуда маятниковых колебаний;
T - длительность затухания маятниковых колебаний от начальной до конечной амплитуды,
истинное значение времени релаксации выбирают из его двух возможных значений с учетом априорной информации о вязкоупругих свойствах гибкого элемента.1. A method for determining the relaxation time of a flexible viscoelastic element, including suspending the load on the element sample under study and exciting its oscillations with measuring their initial and final amplitudes, characterized in that the pendulum oscillations of the load suspended on the sample in the pressure chamber are excited, and the damping oscillation damping time is measured from the initial to the final amplitude, two possible values of the relaxation time of the flexible element are determined by the formula
where τ 1,2 are two possible values of the relaxation time;
m is the mass of the load suspended on the test sample;
g is the local acceleration of gravity;
l is the length of the test sample of the flexible element;
EF — tensile strength of the test specimen;
k is a parameter that determines the attenuation rate of pendulum oscillations, calculated by the formula
where A 0 is the initial amplitude of the pendulum oscillations;
And to - the final amplitude of the pendulum oscillations;
T is the damping duration of the pendulum oscillations from the initial to the final amplitude,
the true value of the relaxation time is chosen from its two possible values, taking into account a priori information on the viscoelastic properties of the flexible element.
где τ - время релаксации гибкого элемента;
l* - длина исследуемого образца, при которой темп затухания колебаний имеет максимум;
g - местное ускорение свободного падения.2. A method for determining the relaxation time of a flexible viscoelastic element, including suspension of the load on the sample under study and the excitation of its vibrations, characterized in that they excite the pendulum vibrations of the load suspended on the sample in the pressure chamber and evaluate the attenuation rate of the pendulum vibrations, repeat the previous operations for different lengths of the studied sample and determine the length of the sample at which the decay rate has a maximum, the relaxation time of the flexible element is determined by the formula
where τ is the relaxation time of the flexible element;
l * is the length of the test sample at which the rate of damping of the oscillations has a maximum;
g is the local acceleration of gravity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2000109769A RU2180105C2 (en) | 2000-04-17 | 2000-04-17 | Procedure determining relaxation time of flexible viscoelastic element ( variations ) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2000109769A RU2180105C2 (en) | 2000-04-17 | 2000-04-17 | Procedure determining relaxation time of flexible viscoelastic element ( variations ) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| RU2180105C2 RU2180105C2 (en) | 2002-02-27 |
| RU2000109769A true RU2000109769A (en) | 2002-03-10 |
Family
ID=20233542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| RU2000109769A RU2180105C2 (en) | 2000-04-17 | 2000-04-17 | Procedure determining relaxation time of flexible viscoelastic element ( variations ) |
Country Status (1)
| Country | Link |
|---|---|
| RU (1) | RU2180105C2 (en) |
-
2000
- 2000-04-17 RU RU2000109769A patent/RU2180105C2/en active
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