TAILIEUCHUNG - mechanics of materials 3rd 2011

Philosophical debates have arisen over the present and future use of technology in society, with disagreements over whether technology improves the human condition or worsens it. Neo-Luddism, anarcho-primitivism, and similar movements criticise the pervasiveness of technology in the modern world, opining that it harms the environment and alienates people; proponents of ideologies such as transhumanism and techno-progressivism view continued technological progress as beneficial to society and the human condition. Indeed, until recently, it was believed that the development of technology was restricted only to human beings, but recent scientific studies indicate that other primates and certain dolphin communities have developed. | PROBLEM Two solid cylindrical rods AB and BC are welded together at B and loaded as shown. Knowing that dỵ 30 mm and d2 5 mm find the average normal stress in the mid section of a rod AB b rod BC SOLUTION 3 3 roe AB Foirce p ẻ o x ù1 Ụ ý is ữ Area- A - al Ẹ sox ô 3 - 7ũCSỔ o 4 Nơr n d s ress SAS Jr - .A - w S8 X 04 pq fl fUfo. Qtt ffj 6 8 MPa b roc Be Force p Gox O1 - XÍ01 - I9o X O3 N Area. A dj z ỈD s hi1 Ajor v a7 stress . Cffc - y - 16-T7 X OỂ Pq. Sfic - MPa. PROBLEM Two solid cylindrical rods AB and BC are welded together at B and loaded as shown. Knowing that the average normal stress must not exceed 150 MPa in either rod determine the smallest allowable values of the diameters d and dj. SOLUTION rod A8 p GOX IO3 hỉ Area A - oil4 -- T A I J L Ỉ ji y-p_ _ 4-V6OX O3 TT ISO K O d - x a 3 H s ress 6 . ISO Xia . A 504. 3 X 0 c n 2 - 33 Ố rod 8C Force p - ỂOxlO3 - o - - 1 0 xl o M s reii . - ISO IO Pa A e K- A - ỹdự A -nd2 J u i p Tĩơec x TT Q- ỈSO X o - 40. lé XỊo vn dj - .

• Tự động hoá
• The subject of rock mechanics
• Content of this book
• Geological setting
• Natural rock environments
• Stress as a point property