技术与设计2（Technology and design 2）.doc

技术与设计2（Technology and design 2） The technology and design of the 2 review outline The first chapter: structure and design (a), the common understanding of the structure: A structure (structure) is that each ordered part between collocation and arrangement. 1, the nature of celestial body structure, plant structure, the structure of animal production and life as well as the structure of cases: what products are inspired by the nature of things and structure? Such as: (a plant leaf) submarine (FISH) radar (BAT). 2, the field of Technology: the structure of a car, computer, digital control structure of bed structure (case: Quebec bridge collapse P4) 3, social areas: education management system structure, general technical discipline structure, the structure of classroom teaching Two, force and structure 1, the internal force: when a structure is subjected to external force, will change the interaction between the inside of each particle, produce a resistance force, called internal force. Stress: the internal force is generated on the cross section of member units. The formula of stress: sigma = F/s, wherein F is S is the internal force, stress area, the stress is. The basic form of force, 2 members: The tension: pulling force on the object The pressure: the extrusion force of the object The shear stress: two was very close, equal and opposite direction, and act on the same object parallel force The torsional force: the opposite direction to the ends of objects uniformly, the object torsion deformation force The bending force acting on the body, making it: bending force The classification, structure three The difference between object structure under stress and in power transmission mode is divided into entity structure, frame structure and shell structure 1, usually refers to the entity structure, the structure itself is solid structure. Stress characteristics: force distribution in the whole volume. The main pressure such as walls, pillars, solid ball etc. 2, frame st