The present work is part of a study of windshield glass erosion subjected to the Saharan sand particles projection. The objective is to highlight the effect of the sand grains size Ps on the degradation process of the ordinary glasses surface (damage rate Dr) and to search the visibility limit of vehicles' drivers. Various erosion tests are carried out and have led to different surface states by varying the sand mass Mp and the particles size Ps. The effect of the surface damage on root mean square roughness Rq, damage rate Dr, and optical transmission To are presented. A clear dependence between these three parameters and the particles size has been highlighted. The results show that Rq increases linearly with Ps increasing, whereas the Dr variation in function of Ps obeys a Gaussian function. In addition, a good correlation between the optical transmission loss and the damage rate is found. In terms of the driver's good vision, the damage of the windshield surface depends essentially on the parameter Dr. Therefore, the visibility limit is determined with regard to this parameter which is dependent on the sand particles size.

中文翻译：

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喷砂损坏的挡风玻璃表面特征

本工作是对受撒哈拉沙粒投影影响的挡风玻璃腐蚀的研究的一部分。目的是强调砂粒尺寸Ps对普通玻璃表面的退化过程的影响（损坏率Dr），并寻找车辆驾驶员的能见度极限。进行了各种腐蚀测试，并通过改变砂质量Mp和粒径Ps导致了不同的表面状态。提出了表面损伤对均方根粗糙度Rq，损伤率Dr和光透射率To的影响。这三个参数与颗粒大小之间存在明显的依存关系。结果表明，Rq随Ps的增加线性增加，而Drs的Ps函数服从高斯函数。此外，发现光传输损耗与损坏率之间具有良好的相关性。就驾驶员的良好视野而言，挡风玻璃表面的损坏主要取决于参数Dr。因此，根据该参数确定可见性极限，该极限取决于沙粒的大小。