塑料. 划痕损伤和划痕可见性的定量评估

[中文适用范围]： 该国际标准涉及聚合物中划痕引起的损坏和划痕可见度的定量评估。 本国际标准规定了两种评估划痕损伤和划痕可见度的方法，用 3D 颜色模型的三个颜色坐标表示。 方法 A 使用能够在恒定负载条件下与材料表面进行面接触或线接触的划痕尖端。 它用划痕损伤指数（SDI）来表示。 方法 B 使用能够在线性增加的负载条件下进行线接触的划痕尖端。 它用划痕可见性指数（SVI）来表示。 该方法适用于涂覆和未涂覆的热塑性和热固性模制材料。 该方法指定了测试样本的优选尺寸和优选的划痕尖端几何形状。 [外文原描述]： ISO 17541:2014 deals with quantitative evaluation of scratch-induced damage and scratch visibility in polymers. ISO 17541:2014 specifies two methods to assess scratch damage and scratch visibility expressed by three colour coordinates of a 3-D colour model. Method A uses a scratch tip capable of area-contact or line-contact with material surfaces under a constant load condition. It is represented by scratch damage index (SDI). Method B uses a scratch tip capable of line-contact under a linearly increasing load condition. It is represented by scratch visibility index (SVI). The methods are suitable for use with coated and uncoated thermoplastic and thermosetting moulding materials. The methods specify the preferred dimensions of testing specimens and the preferred scratch-tip geometry.