XOẮN THUẦN TÚY
• Quy ước chiều và dấu
của momen nội
lực:nhìn vào mặt
cắt,thấy Mz quay cùng
chiều kim đồng hồ
Mz Mz
z
Mz>0
Mz Mz
z
Mz<0
Các Trục Chịu Xoắn
Liên HệGiữa Momen Xoắn Ngoại Lực
Với Công Suất Và SốVòng Quay
Quan Sát Thanh Tròn Chịu Xoắn
Quan Sát Thanh Tròn Chịu Xoắn
• Chiều dài không đổi nên
trên MCN không có ứng
suất pháp
• Mặt cắt ngang xoay nên trên
MCN có ứng suất tiếp
![Xi măng: Tìm hiểu về các loại xi măng [mới nhất]](https://cdn.tailieu.vn/images/document/thumbnail/2013/20130728/sunshine_10/135x160/9281374952583.jpg)
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