Relationship between characteristic parameters of impact test for safety glasses

Abstract

This paper presents results from experiments on soft impact testing of glass plates. In the experiments, a 50-kg twin-tire pendulum was used to strike different glass plates at speeds of up to 4.85 m/s. The impact parameters that were defined and measured include the micro-strain in the glass plates, pendulum acceleration, duration of contact, pendulum height, and maximum tire track values. A total of 240 impacts on 17 specimens were carried out for different glass thicknesses (5, 6, 8, and 10 mm) and boundary conditions (four sides, two sides and four pin points supported). Tempered monolithic and toughened bi-layered laminated plates were tested. To find out if the selected parameters represent the phenomena, multiple regression analysis was carried out.

Similarity index: A procedure for comparing impact time histories validated with soft impact test

“…The value of the parameters have been obtained for all the impacts. In the case of the maximum acceleration (AP) and the impulse (IP), the analysis of the test results [24] shows the linear behavior of each parameter versus the nominal initial velocity of the impact head for each plate configuration. Therefore, a nominal reference impact (NRI) can be defined to estimate the impulse and the maximum acceleration, Analyzing all the impacts versus the nominal initial velocity (energy level), the acceleration (AP) and the impulse (IP) shows a good linear behavior but dispersion among the different configurations (structure sizes and boundary conditions) appears.…”

Método alternativo para registrar el nivel de excitación en ensayos de impacto humano

“…La extensa campaña de ensayos realizada en 2006 consta de tres tipos de ensayos (Postigo Pozo 2010) (Postigo et al 2011) (Pacios et al 2011):…”