Impact testing of disaster prevention and crime prevention eco-windows, protecting 3mm glass

We conducted an experiment to see if it was possible to protect thin glass from falling objects with edges.

Falling objects: Swivel (170g), bolts and nuts, shackles, thumb screws

**Impactor used** : **Complex shapes were chosen instead of spheres**

Overall photo of the experimental setup: A free-fall impact object is dropped from a height of 1m onto a glass panel covered with hollow polycarbonate.

Metal fittings are attached to the 3mm thick glass at 30cm intervals, and a 4mm thick hollow polycarbonate plate is attached on top of that.

Depending on the shape of the metal fittings, a space of 2 to 3 mm will be created between the glass and hollow polycarbonate.

Drill a hole of about 10 mm into the hollow polycarbonate and secure it with a coin nut.

Impact test video (slow motion) ⇒　YouTube video

The edges of falling objects can cause dents.

Conclusion:

It is believed that the impact of the edges of the falling object is absorbed by the hollow polycarbonate denting, and the kinetic energy of the fall is absorbed by the entire polycarbonate plate bending.

For inquiries, please contact: NPO Escot　
4-17 Higashikamicho, Kashiwa City, Chiba Prefecture, 277-0011
Testing Center 768-22 Kamifuse, Onjuku Town, Isumi District, Chiba Prefecture
Tel: +81-4-7166-4151
Mobile: +81-80-4365-0861
Fax: +81-4-7166-4128
https://www.npo-escot.org
ser.kashiwa@gmail.com