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工程机械强度测试过程中,经常要使用长导线或长电缆。特别是塔式起重机的强度测试一般导线的长度在30～100m之间。这些导线的电阻是不能忽略的。1 电阻应变片电阻变化率与应变电阻应变片电阻变化率与应变的关系为: △R/R=K·ε式中K——应变片灵敏系数△R——电阻增量R——桥臂原始电阻值ε——应变值以50m长导线为例,当应变片R=120Ω,K=2,应变片粘贴处的构件,由于应力产生的应变为1000με时,如果不计导线电阻,△R=240×10~(-3)Ω,如果考虑导线电阻0.13Ω/m,
Construction machinery strength testing process, often use long wires or long cables. In particular, the strength of the tower crane test general wire length between 30 ~ 100m. The resistance of these wires can not be ignored. 1 resistance strain gauge resistance rate of change and strain resistance strain gauge resistance rate of change and strain as: △ R / R = K · ε where K - strain gauge sensitivity △ R - resistance increment R - arm The original resistance value of ε - strain value to 50m long wire, for example, when the strain gauge R = 120Ω, K = 2, the strain gages affixed to the components, due to stress strain 1000με, 240 × 10 ~ (-3) Ω, if we consider the wire resistance of 0.13Ω / m,