Influence of the velocity and impact angle on the distribution of the surface defects of a sandblasted glass

Abstract

Sandblasting erosion tests were simulated in laboratory to study the size distribution of defects generated by sandstorms in the Saharan regions on soda lime glass, considering different velocities (V = 15, 25, 35 m/s) and different impact angles (α = 30°, 60°, 90°). The influence of these 2 parameters on the defect sizes and the defects number was studied. The defect sizes were measured on a surface of 1 cm2 in the central zone of the damaged surfaces. The damaged surfaces show that the defects with varying sizes are randomly distributed. The surface degradation increases as the velocity and the impact angle increase. Weibull analysis was introduced to characterize the size distribution of surface defects for different test conditions. Weibull plots indicate that the behavior is presented following 2 aspects: The first aspect is unimodal which exists only in 2 extreme conditions, and the second aspect is bimodal, but only for intermediate cases.

Four-Parameter Weibull Distribution with Lower and Upper Limits Applicable in Reliability Studies and Materials Testing

“…Sandblasting erosion tests simulating the effect of sandstorms in the Saharan regions on soda lime glass were performed by Barka et al [15]. The influence of three different velocities of sand particles and three different impact angles on the defect sizes and defect numbers was studied.…”

“…The influence of three different velocities of sand particles and three different impact angles on the defect sizes and defect numbers was studied. The defect size distribution was identified as the Weibull distribution for the conditions (15 m/s and 90 • ) and (35 m/s and 30 • ) as the bimodal Weibull distribution [15]. The Weibull plot of the defect sizes for the mentioned conditions with the Weibull failure probability estimator (4) is drawn in Figure 11.…”

Early stages of glass alteration in the coastal atmosphere

“…This water can stay on the glass surface for long periods of time favoring the local alteration of the glass in the long term. Some samples presented also mechanical impacts on their surface due to the collision of soil particles transported by the wind at high speed [29,30]. The mechanical impact created conchoidal fractures in the impact point (Fig.…”

“…The mechanical impact created conchoidal fractures in the impact point (Fig. 1 c), whose dimensions depended on size, form, composition, hardness, impact angle and velocity of the soil particles [30].…”

A windshields surface characterization damaged by sandblasting

“…The air blowing speed was measured using an anemometer and corresponds to the average speed encountered during sandstorms in the Sahara. According to the services of Ouargla weather station, the average speed of sandstorms usually varies between 12 and 35 m/s. The distance between the nozzle and the specimens is adjusted to 50 mm in such manner to avoid the particles divergence outside the exposed surface.…”