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| 西威尔斯值测定材料滑动磨损的一种方法。用直径 8.5mm、端部镶碳化钨的小型钻孔机在预先切出岩样上钻孔，用20kg 的物体向钻头施力。 SJ 值是200转后钻出的深度，以1/ 10mm 表示。4 Siewers 8个钻孔的平均值选作 SJ 值。为测定 SJ 值,通常是平行于层理钻岩 | |||
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