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Консультация № 149059
31.10.2008, 00:59
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Может и с этой возможно помочь. Алюминевый образец размером 12х12мм несет нагрузку 35500Н, в результате чего упруго деформирован. Каким должен быть для этого минимально необходимый предел текучести. Ответ: Ro,2=296Н/мм2. Зарание спосибо за ответ.
Обсуждение
31.10.2008, 04:00
общий
это ответ
Здравствуйте, Ирина П.!
Площадь поперечного сечения образца равна 12*12 = 144 мм². Повидимому, образец нагружен растяжением (или сжатием), поэтому фактическое нормальное напряжение в нём σн = 35500/144 = 246.5 Н/мм². Т.к. по условию образец при этом упруго деформирован, значит σн не превышает предела упругости σупр. В условии же требуется указать предел текучести σт, т.е. величину напряжения, при которой начинается пластическая деформация. В приводимых Вами пояснениях что-то об этом говорится, но конкретную связь между этими пределами не уловил. С тех пор как я учил сопромат, теория физики твёрдого тела сильно продвинулась, но я лично этим не занимался. Единственно, чем могу помочь - когда я наугад умножил 246.5 на 1.2 - получилось как раз 296 - цифра, данная в ответе. Обосновать же, почему именно 1.2 мне больше нечем. Не знаю, будет ли всё сказанное засчитано как ответ.
Площадь поперечного сечения образца равна 12*12 = 144 мм². Повидимому, образец нагружен растяжением (или сжатием), поэтому фактическое нормальное напряжение в нём σн = 35500/144 = 246.5 Н/мм². Т.к. по условию образец при этом упруго деформирован, значит σн не превышает предела упругости σупр. В условии же требуется указать предел текучести σт, т.е. величину напряжения, при которой начинается пластическая деформация. В приводимых Вами пояснениях что-то об этом говорится, но конкретную связь между этими пределами не уловил. С тех пор как я учил сопромат, теория физики твёрдого тела сильно продвинулась, но я лично этим не занимался. Единственно, чем могу помочь - когда я наугад умножил 246.5 на 1.2 - получилось как раз 296 - цифра, данная в ответе. Обосновать же, почему именно 1.2 мне больше нечем. Не знаю, будет ли всё сказанное засчитано как ответ.
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