机器元素的设计|门机械基本概念

1.In majority of machine members, the damping capacity of the material should be zero.
2. At quite low temperatures (say -75°c) the notched bar impact value of steel decreases significantly.
3. The crest diameter of a screw thread is same as major diameter.
4.如果d是螺栓孔的直径，则为了证明泄漏的管道接头，螺栓的圆周螺距应为20√d -30√d。
5. Muntz metal contains copper-zinc.
6. A Babbitt is antimony bearing lead or tin alloy.
7. Steel balls for ball bearing are manufactured by cold heading.
8. The blow off pressure of a safety value is 106% of boiler working pressure.
9. A foundation bolt with a circular end is secured to the floor by means of a steel cotter. If the pull on the bolt is 14000 kg, the diameter of the bolt should be 60 mm.
10.如果关节关节，销钉最有可能以双剪切效果失效。
11.钥匙是切割的，既是轴，又是集线器是沉没钥匙的情况。
12. Splines are used when axial relative motion between shaft and hub is necessary.
13.花键通常用于汽车中。
14.通用耦合/钩子的关节用于非结晶轴。

15.在法兰耦合中，最弱的元素应该是关键。
16. Turn buckle has left hand threads on one end and right hand threads on other end.
17.弹性螺母是一种锁定装置，具有硬纤维或尼龙小肠，在螺母中嵌入，并在螺栓上拧紧螺栓时变成螺纹。
18. Treating the weld as a line, the moment of inertia about center of gravity of a circular weld of diameter d, would be πd3/4.
19. A single ply leather belt running at a belt velocity of 300 ft/min is likely to transmit per inch of width 4.0 HP.
20. For butt welding of two plates each of which is 25 mm thick, the best process would be electro slag welding.
21.压缩构件倾向于弯曲到最小半径的方向
22.洗衣机的直径通常略高于螺栓的直径。
23. A reinforced concrete beam is considered to be made up of heterogeneous material.
24.根据Euler的理论，列的临界长度由PC =π2EI/L2给出。
25. Rankine formula is valid up to slenderness ratio of 120.
26.一柱的细长比率是旋转的支柱/最小半径的长度。
27.在具有油膜压力的流体动力学中，仅通过杂志的旋转而产生。
28. If P = bearing pressure on projected bearing area, z = absolve viscosity of lubricant, and N = speed of journal, then the characteristic number is given by ZN/p.
29. The rated life of bearing changes inversely as cube of load.
30.油脂轴承不需要外部润滑剂供应。
31.在交叉或常规的衬里绳索方向上，在林分中的扭曲方向与林分的扭曲方向相反。
32.手表的齿轮通常由螺旋角制造。
33.用于低速和中等速度发动机的凸轮类型通常是谐波的
34. The form coefficient of a spring is capability to store energy.
35. Coriolis的加速度分量是在机智的返回运动中发现的
36.材料的冷工作会增加疲劳强度。
37. A Babbitt is antimony bearing lead or tin alloy
38. Addendum of a cycloidal gear tooth is epicycloids
39. Spiral gears are suitable for transmitting small powers
40.随着泵的速度增加其NPSH（净正吸头）需求增加
41.如果不满足泵NPSH的要求，它将被关闭
42.布什辊链用于摩托车。
43.针对起重机施用的链的工作载荷用CM中的链路直径表示，并由500乘以直径的平方乘以。
44. If a square key and shaft are to be of the same material and or of equal strength, the length of key would be 1.23d, d=diameter of shaft
45. In a standard coarse thread bolt the stress concentration is maximum at root.
46. Fatigue strength of a surface may be increased by polishing the surface
47. The maximum deflection allowed in gantry girders is L/1000
48. The maximum size of the fillet weld that can be used at 3 mm
49. The maximum size of fillet weld that can be made in single pass in 6 mm
50.指定为50 ISF 8的滚动钢扁平意味着该扁平宽50毫米，厚度为8毫米。
51.列接头用于增加色谱柱的长度
52. The minimum thickness steel member exposed to weather and accessible for painting is 10 mm
53. For determination of allowable stress in axial compression, IS: 800-1962 has adopted secant formula
54.为了准确，以6 m/s秒的速度运行的切割齿轮，速度因子V由6/6+V给出
55. Herinnghbone齿轮中经历了零轴向推力
56.为了实现液体摩擦的优势，必须在轴承方面具有平行油膜
57.在轴承内慢速旋转方向旋转的轴将朝轴承的左侧，并使金属与金属接触
58.轴承特性数量与润滑剂的Z-充血粘度，日志n速和投影轴承区域的P含压压力为Zn/p