آخرین ارسال های تالار گفتمان
بازدید : 3262 مرتبه
تاریخ : 22 شهریور 1391

روابط و معادلات بنیادی و ویژگی های مسائل تئوری ارتجاعی

در بخش اول فصل پیشین، وضعیت تنش در نقطه ای اختیاری (Arbitrary Point) از یک جسم که تحت اثر نیروهایی قرار دارد، مورد بررسی و مطالعه قرار گرفت و ضمن استخراج تانسور تنش، خواص مختلف آن تشریح گردید.

در بخش دوم فصل پیشین، وضعیت کرنش (یا تغییر شکل نسبی) در نقطه ای اختیاری مورد مطالعه قرار گرفت و این در حالی بود که اصولاً هیچ سؤالی در مورد علت ایجاد یا عامل بوجود آورنده تغییر شکل مطرح نگردید. اساساً مسأله بررسی کرنش در نقطه ای دلخواه از یک جسم، یک مسأله صرفاً ریاضی بود.

اما واقعیت این است که تغییر شکل جسم به علت تحریک جسم توسط عاملی که به آن کنش (Action) گفته می شود، بوجود می آید. این کنش ممکن است مستقیماً به صورت نیرو بوده و یا اینکه عاملی دیگر مانند درجه حرارت باشد که در هر صورت علت پیدایش میدان تنش است.

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موضوع : متالورژی و مکانیک - پاورپوینت
ارسال توسط metaller

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