SU879379A1 - Material physical mechanical characteristics variation determination method - Google Patents
Material physical mechanical characteristics variation determination method Download PDFInfo
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- SU879379A1 SU879379A1 SU802888135A SU2888135A SU879379A1 SU 879379 A1 SU879379 A1 SU 879379A1 SU 802888135 A SU802888135 A SU 802888135A SU 2888135 A SU2888135 A SU 2888135A SU 879379 A1 SU879379 A1 SU 879379A1
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(54) СПОСОБ ОПРЕДЕЛЕНИЯ ИЗМЕНЕНИЙ(54) METHOD FOR DETERMINING CHANGES
ФИЗИКО-МЕХАНИЧЕСКИХ ХАРАКТЕРИСТИК МАТЕРИАЛОВPHYSICAL AND MECHANICAL CHARACTERISTICS OF MATERIALS
Изобретение относитс к области механических испытаний материалов и может быть использовано при исследовании физико-механических характеристик композиционных материалов на основе термореактивных полимеров.The invention relates to the field of mechanical testing of materials and can be used in the study of the physicomechanical characteristics of composite materials based on thermosetting polymers.
Известны способы определени изменений физико-механических характеристик материалов, в которыхнагрузку на образец поддерживают посто нной при постепенном повышении температуры , измер ют деформацию в конце каждого периода действи нагрузки и соответствующую температуру образца в этот момент }.Methods are known for determining changes in the physicomechanical characteristics of materials in which the load on the sample is kept constant with a gradual increase in temperature, the deformation at the end of each load period and the corresponding sample temperature at this moment are measured}.
Известен также способ определени изменений физико-механических характеристик металлов, прин тый за прототип, включающий воздействие посто нно нагрузки на образец в ка)сдом цикле испытаний и нагрев образца, причем ЦИК.ЛЫ различают величиной нагрузки на образец 2.There is also known a method for determining changes in the physicomechanical characteristics of metals adopted as a prototype, including the effect of a constant load on a sample in a sd test cycle and sample heating, and the CEC. Is distinguished by the value of the load on the sample 2.
При проведении расчетов конструкций из композиционных материалов на основе термореактивных полимеров на прочность и деформируемость необходимо знать предельную величину характеристик упругости и врем , необходимое дл ее реализации. Под характеристиками упругости материа.па понимаетс диаграмма мгновенного нагружени материала и определ емый из нее модуль упругости.When making calculations of structures made of composite materials based on thermosetting polymers for strength and deformability, it is necessary to know the limiting value of the elastic characteristics and the time required for its realization. Under the characteristics of the elasticity of the material, a moment diagram is understood as the instantaneous loading of the material and the modulus of elasticity determined from it.
При проведении испытаний по известному вышеуказанному способу невозможно определить эти величины.When conducting tests on the known above method, it is impossible to determine these values.
Целью изобретени вл етс определение предельной величины характерис10 тик упругости и времени, необходимого дл ее реализации.The aim of the invention is to determine the limiting value of a characteristic of elasticity and the time required for its implementation.
Поставленна цель достигаетс тем, что в способе определени физико-механических характеристик материалов, The goal is achieved by the fact that in the method of determining the physicomechanical characteristics of materials
15 путем циклического нагрева, нагружени образца и измерени величины деформации , в каждом цикле образец нагревают до температуры выше температуры начала термодеструкции, а наг20 ружение производ т при этой температуре , определ ют из полученных данных зависимость деформации образца от нагрузки дл разных времен выдержки , по которым суд т о предельной 15 by cyclical heating, loading the sample and measuring the amount of deformation, in each cycle the sample is heated to a temperature above the temperature of the onset of thermal decomposition, and loading is performed at this temperature. From the data obtained, the dependence of the sample strain on the load for different exposure times is determined. marginal court
25 величине до совпадени названных зависимостей в двух последующих циклах , по которой суд т о предельной величине характеристик упругости и о времени, необходимом дл ее реали30 зации. Способ по сн етс примерами.25 to the extent of coincidence of the above dependences in two subsequent cycles, according to which we judge the limiting value of the elastic characteristics and the time required for its realization. The method is illustrated by examples.
Пример 1. Проводилось сн тие диаграмм мгновенного нагружени стеклотекстолита с.наполнителем из стеклоткани и фенольно- формальдегидным св зующим при температуре . Температура начала термодеструкции дл фенольно-формальдегидных смол 200-250С.Example 1. The instantaneous loading of fiberglass textiles was carried out with a glass fiber filler and a phenolic formaldehyde binder at a temperature. The temperature of the beginning of thermal decomposition for phenolic-formaldehyde resins is 200-250С.
Испытани проводились в инертной среде. Образец нагревалс до температуры 400с со скоростью нагрева ЬО-/0 град/мин и затем нагружалс рас т гивающей нагрузкой со скоростью нагружени не менее 100 кг/см сек.Большие скорости нагружени необходимы дл исключени деформаций ползучести.Испытани проводились на образцах толщино 2 мм с целью устранени больших перепадов температуры на толщине образца при больших скорост х нагрева.The tests were carried out in an inert environment. The sample was heated to a temperature of 400 s with a heating rate of L-0/0 deg / min and then loaded with a tensile load with a loading rate of at least 100 kg / cm s. Higher loading rates are necessary to eliminate creep deformations. The tests were carried out on samples 2 mm thick. the purpose of eliminating large temperature differences in the sample thickness at high heating rates.
Испытание проводилось на разрывной машине, диаграмма записывалась на двухкоординатном самопишущем приборе . Испытание повтор ли не менее 5 раз, на разных образцах, данные осредн ли. В результате получали кривую 1 .(см. чертеж) .The test was carried out on a tensile machine, the chart was recorded on a two-coordinate recording device. The test was repeated at least 5 times, on different samples, the data were averaged. As a result, curve 1 was obtained. (See drawing).
На чертеже изображены графики изменени относительного удлинени от нагрузки дл разных времен выдержки.The drawing shows graphs of the variation of the relative elongation from the load for different holding times.
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SU802888135A SU879379A1 (en) | 1980-02-22 | 1980-02-22 | Material physical mechanical characteristics variation determination method |
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SU802888135A SU879379A1 (en) | 1980-02-22 | 1980-02-22 | Material physical mechanical characteristics variation determination method |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101858798A (en) * | 2009-04-10 | 2010-10-13 | 宝理塑料株式会社 | Has the critical load Forecasting Methodology that stress is concentrated the resin forming product of portion |
RU2644452C1 (en) * | 2016-12-26 | 2018-02-12 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тульский государственный университет" (ТулГУ) | Testing method of samples from material under stressing with high temperature |
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1980
- 1980-02-22 SU SU802888135A patent/SU879379A1/en active
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101858798A (en) * | 2009-04-10 | 2010-10-13 | 宝理塑料株式会社 | Has the critical load Forecasting Methodology that stress is concentrated the resin forming product of portion |
CN101858798B (en) * | 2009-04-10 | 2014-04-09 | 宝理塑料株式会社 | Method for predicting critical load of resin shaping product with stress centralizing part |
RU2644452C1 (en) * | 2016-12-26 | 2018-02-12 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тульский государственный университет" (ТулГУ) | Testing method of samples from material under stressing with high temperature |
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