5656

Растяжение кольцевых образцов

Лабораторная работа

Физика

Растяжение кольцевых образцов Цель работы: Определить модуль Юнгав окружном направлении и предел прочности. Провести статистическую обработку предела прочности по результатам испытаний всех групп. Приборы и оборудование: Испытательная ма...

Русский

2012-12-16

61 KB

10 чел.

Растяжение кольцевых образцов

Цель работы:

Определить модуль Юнга в окружном направлении и предел прочности.

Провести статистическую обработку предела прочности по результатам испытаний всех групп.

Приборы и оборудование:

  1.  Испытательная машина
  2.  Штангенциркуль
  3.  Образец из стеклопластика кольцевой формы:

l = 19,6мм; h = 9,5мм; r(вн) = 71,25мм; r(нар)=76мм

Диаграммы:

Рис. 1 Зависимость перемещения от нагрузки.

Рис. 1 Зависимость деформаций от напряжений.

Модуль упругости:

Предел прочности: 

Па

Статистическая обработка результатов испытаний:

E1, МПа

E2, МПа

E3, МПа

30,81

26,49

28,2

Среднее значение предела прочности   Eср=28,5 МПа

Среднеквадратичное отклонение  Eкв= = 4,69

Дисперсия разброса свойств D== 1,25

Вариация  W==0.044

Доверительный интервал

Верхняя граница Dв= Eср+ D

Dн= Eср D

t – Коэффициент Стьюдента для 3 опытов и вероятностью 0.95

t= 4.30

Dв=31,604

Dн=25,396

Вывод: 

В ходе выполнения лабораторной работы было проведено знакомство с проведением испытания на растяжение кольцевых образцов, по результатам испытаний построена диаграмма деформирования, определены кольцевой модуль Юнга и предел прочности. Проведена статистическая обработка результатов опытов.


 

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