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车辆制动衬片剪切强度拉力机测试方法GB/T 26739-2011

作者：來源：发布日期： 2020.10.21

信息摘要：

车辆制动衬片剪切强度拉力机测试方法GB/T 26739-2011

车辆在使用情况下刹车时，在盘式制动器衬块材料内部会产生很大的剪切应力，在鼓式制动器衬片中，剪切应力会因几何效应而增大。国标GB/T 26739-2011规定了通过拉力机如何测试相应的剪切应力。本标准已于2012年3月起实施。

圖爲所需的剪切夾具示意圖：

最少制备5件试样，试样受检平面应与正常制动时的手里方向平行。试样尺寸如下：长20MM,KUAN 20MM，厚5MM或10MM。

在拉力機上裝好剪切夾具，並安裝好試樣，以平均加載速率4500N/s進行加載，當剪切力高于5000N時，建議加載裝置瞬間加載速率浮動範圍上下不超過2250N/s.

剪切夾具上下兩部分，剪切力通過夾具與試樣兩者的中線，並于導軌平行，誤差不能超過規定範圍。

試驗機加載要平穩，不能有沖擊。直至襯片材料破裂爲止。

試驗報告輸出最大力及剪切面積。

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