3.30 Week9 Note

This week is about Mechanical Design.

Principles

• stress-strain 应力

  物体由于外因（受力、湿度、温度场变化等）而变形时，在物体内各部分之间产生相互作用的内力，以抵抗外因的作用，并试图恢复到变形前的位置。

• moduli 模

• elastic 弹性, plastic flow
• friction 摩擦
• spalling 剥落
• hysteresis 磁滞
• backlash 强烈反对
• flexure 弯曲
• force loops 力循环
• elastic averaging 弹性平均
• kinematic coupling 运动学耦合

Materials

• plastic : Rigid HDPE Polyethylene is good for making machine parts
• metal
• ceramic 陶瓷
• rubber
• foam 泡沫

fasteners: nuts 螺母, bolts 螺栓, washers 垫圈

pins

framing: metal, plastic, t-slot, self-aligning

drive(驱动):

• gears

• sprockets 链轮

  

• belts 传送皮带

  

• chains

• shafts 转动轴

  

• rods 螺纹钉

• nuts

guide: shafts, rails 导轨, slides

couplers 耦合器: shafts, joints

bearings 轴承:

• ball

  

• thrust 推力轴承

• linear 直线轴承

  

• rotary 回转轴承

  

• sleeve 滑动轴承

  

rotary: wheels, pulleys 滑轮, casters 脚轮

lubricants 润滑剂

More materials

Applied Mechanics of Solids