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Mechanical Engineering

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Structural Analysis

Cutting Pliers as a Force-Multiplying Machine

Description

Cutting pliers are a machine that helps transmit force through movable, pin-connected members. In this example, the handles and cutting edges work together to cut wire by turning an input force into a larger output force at the jaws.

When equal and opposite forces are applied to the handles, the ...

Transcript

机械是由可移动的、通过销钉连接的多力构件组成的结构,这些构件形成一个稳定的系统以传递力。

考虑使用一把剪线钳,通过在其手柄上施加力来剪断金属丝。

当在剪切钳的手柄上施加大小相等、方向相反的力时,会导致剪切钳的刃口闭合,从而在导线上施加大于所施加力的大小相等、方向相反的反作用力。

通过拆解剪线钳并绘制其各部件的受力分析图,可以确定施加在导线上的力的大小。

通过分析固定钳子的枢轴销处的力矩,可以在相隔一定距离施加的作用力与反作用力之间建立一种关系。

类似地,通过绘制枢轴销的受力分析图,可以确定枢轴销处内力的分量。

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