SU1582050A1 - Specimen in shape of figure of eight for determining strength of mould and core sands in hardened state - Google Patents

Specimen in shape of figure of eight for determining strength of mould and core sands in hardened state Download PDF

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Publication number
SU1582050A1
SU1582050A1 SU874292701A SU4292701A SU1582050A1 SU 1582050 A1 SU1582050 A1 SU 1582050A1 SU 874292701 A SU874292701 A SU 874292701A SU 4292701 A SU4292701 A SU 4292701A SU 1582050 A1 SU1582050 A1 SU 1582050A1
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SU
USSR - Soviet Union
Prior art keywords
specimen
mould
shape
sample
hardened state
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Application number
SU874292701A
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Russian (ru)
Inventor
Виктор Григорьевич Бабец
Степан Пантелеевич Дорошенко
Александр Александрович Драчнев
Николай Алексеевич Кидалов
Нионилла Александровна Осипова
Original Assignee
Предприятие П/Я В-2684
Волгоградский Политехнический Институт
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Priority to SU874292701A priority Critical patent/SU1582050A1/en
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Publication of SU1582050A1 publication Critical patent/SU1582050A1/en

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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Изобретение относитс  к испытательной технике и может быть использовано при испытании прочностных свойств формовочных и стрежневых смесей в отвержденом состо нии. Цель изобретени  - повышение точности измерени  прочностных показателей путем уменьшени  их разброса. Цель достигаетс  выполнением в шейке стандартного образца-восьмерки U-образного углублени  2 глубиной 0,32а и радиусом не менее 0,16а, где а - ширина шейки образца 3. 1 ил.The invention relates to a testing technique and can be used in testing the strength properties of molding and core mixtures in the cured state. The purpose of the invention is to improve the accuracy of measuring strength properties by reducing their spread. The goal is achieved by performing in the neck of a standard figure-eight a U-shaped recess 2 with a depth of 0.32a and a radius of at least 0.16a, where a is the width of the neck of sample 3. 1 Il.

Description

Изобретение относится к испытательной технике и может быть использовано при определении прочностных показателей формовочных и стержневых смесей в отвержденном состоянии. 5The invention relates to testing equipment and can be used to determine the strength characteristics of molding and core mixtures in the cured state. 5

Целью изобретения является уменьшение разброса при определении прочностных показателей хрупких смесей.The aim of the invention is to reduce the dispersion in determining the strength characteristics of brittle mixtures.

На чертеже изображен предлагаемый образец.The drawing shows the proposed sample.

Образец-восьмерка имеет две вогнутые 1 и две плоские 2 поверхности, шейку 3 шириной а, которая содержит U-образное углубление 4, причем глубина выреза равна 0,32 а, а радиус не менее 0,16 а. При нагружении образца около углубления возникает концентрация напряжений, вызванная самим углублением и внёцентренным растяжением. Концентрация напряжений вызывает разрушение образца только в ослабленном сечении, что приводит к уменьшению разброса определяемых прочностных показателей. Расчет прочностных показателей (предел прочности, критическое значение коэффициента интенсивности напряжений и т.д.) проводится по результатам испытаний с учетом концентрации напряжений и внецентренного растяжения в ослабленном сечении шейки образца-восьмерки.The sample of eight has two concave 1 and two flat 2 surfaces, a neck 3 of width a, which contains a U-shaped recess 4, the depth of the notch being 0.32 a and a radius of at least 0.16 a. When the sample is loaded near the recess, a stress concentration arises caused by the recess itself and eccentric tension. The stress concentration causes the destruction of the sample only in a weakened section, which leads to a decrease in the spread of the determined strength indicators. The calculation of strength indicators (tensile strength, critical value of the coefficient of stress intensity, etc.) is carried out according to the test results taking into account the stress concentration and eccentric tension in the weakened neck section of the sample-eight.

Claims (1)

Образец-восьмерка для определения прочности формовочных и стержневых смесей в отвержденном состоянии, имеющий две вогнутые и две плоские поверхности, 15 отличающийся тем, что, с целью . уменьшения разброса прочностных показателей хрупких смесей, в шейке образца на одной из вогнутых поверхностей выполнено U-образное углубление глуби20 ной 0,32 а и радиусом не менее 0,16 а, где а - ширина шейки образца.Sample-eight for determining the strength of the molding and core mixtures in the cured state, having two concave and two flat surfaces, 15 characterized in that, for the purpose. To reduce the variation in the strength parameters of brittle mixtures, in the neck of the sample on one of the concave surfaces, a U-shaped recess was made with a depth of 0.32 a and a radius of at least 0.16 a, where a is the width of the neck of the sample.
SU874292701A 1987-08-03 1987-08-03 Specimen in shape of figure of eight for determining strength of mould and core sands in hardened state SU1582050A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU874292701A SU1582050A1 (en) 1987-08-03 1987-08-03 Specimen in shape of figure of eight for determining strength of mould and core sands in hardened state

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU874292701A SU1582050A1 (en) 1987-08-03 1987-08-03 Specimen in shape of figure of eight for determining strength of mould and core sands in hardened state

Publications (1)

Publication Number Publication Date
SU1582050A1 true SU1582050A1 (en) 1990-07-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
SU874292701A SU1582050A1 (en) 1987-08-03 1987-08-03 Specimen in shape of figure of eight for determining strength of mould and core sands in hardened state

Country Status (1)

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Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ГОСТ 23409. 7-78. Пески формовочные, смеси формовочные и стержневые. - ГК СССР по стандартам. М., с. 3. *

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