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Консультация № 183690
21.06.2011, 18:38
49.20 руб.
13.06.2013, 13:41
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Проверить прочность сварного шва.
Проверить прочность сварного шва.
Обсуждение
21.06.2011, 23:26
общий
это ответ
Здравствуйте, Николай Алексеевич!
Из Вашего рисунка видно, что рассматривается тавровое соединение, выполненное угловым швом без разделки кромок.
Для расчёта прочности сварных швов заменим показанную на рисунке внешнюю силу Q её статическим эквивалентом: равной ей по величине и направлению силой Q' = Q, приложенной в центре тяжести нижней грани пластины, и изгибающим моментом M = Qa/2, действующим против часовой стрелки в вертикальной плоскости, проходящей через точку приложения силы Q' параллельно боковым граням пластины.
Расчёт ведём по условной методике, суммируя напряжения от растяжения и изгиба:
где
- площадь швов в биссекторном сечении,
- момент сопротивления швов в биссекторном сечении.
В нашем случае вычисления по формулам (1) - (3) дают следующие результаты:
Чтобы сделать заключение о прочности швов, необходимо сравнить полученное значение напряжения с допускаемым. В условии задачи о материале свариваемых деталей ничего не сказано. Полагая, что они сделаны из стали Ст3, имеющей допустимое напряжение при растяжении [[$963$]р] = 160 МПа, для условного допустимого напряжения [[$964$]c'] имеем
Поскольку
постольку сварные швы являются прочными.
С уважением.
Из Вашего рисунка видно, что рассматривается тавровое соединение, выполненное угловым швом без разделки кромок.
Для расчёта прочности сварных швов заменим показанную на рисунке внешнюю силу Q её статическим эквивалентом: равной ей по величине и направлению силой Q' = Q, приложенной в центре тяжести нижней грани пластины, и изгибающим моментом M = Qa/2, действующим против часовой стрелки в вертикальной плоскости, проходящей через точку приложения силы Q' параллельно боковым граням пластины.
Расчёт ведём по условной методике, суммируя напряжения от растяжения и изгиба:
где
- площадь швов в биссекторном сечении,
- момент сопротивления швов в биссекторном сечении.
В нашем случае вычисления по формулам (1) - (3) дают следующие результаты:
Чтобы сделать заключение о прочности швов, необходимо сравнить полученное значение напряжения с допускаемым. В условии задачи о материале свариваемых деталей ничего не сказано. Полагая, что они сделаны из стали Ст3, имеющей допустимое напряжение при растяжении [[$963$]р] = 160 МПа, для условного допустимого напряжения [[$964$]c'] имеем
Поскольку
постольку сварные швы являются прочными.
С уважением.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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