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Osaka Institute of Technology Test of Dglass Coat

August 5, 2019

Test of the glass strengthening properties of the glass coating

Professor, Faculty of Engineering, Osaka Institute of Technology
Ide Nishikawa

Objective
The idea of using glass coating as a method to improve the impact resistance of the glass.

The purpose of this test is to quantitatively clarify whether the impact strength of glass is improved by Dglass Coat.

Test method
Commercially available float glass to be tested. The test pieces are 100mm x 100mm x 2mm thick float glass plates. The glass test plate referred to at the treated material will be coated with Dglass Coat. The plate without the coating applied will be referred to as untreated material.

Impact tester consisted of a stand with a 2 meter long pole with a diameter of 13mm. The instrument was created so that the magnetic portion of the magnetic stand was mounted facing down on the pole in a fixed position. This setup was to hold the iron balls with the magnet. The iron balls to be dropped consisted of martensite stainless steel SUS403 and weighed 64g and 95g respectively. The test stand was set up so that the balls would drop at the center of the test glass pieces. This base was made of an strong piece of 100mm x 100mm x 50mm S54C steel so that all the energy of the falling ball was transmitted to the glass. Therefore, by adjusting the drop height, it could be determined whether or not the test piece is destroyed by the energy of the drop.

Basically, each was to be tested with a falling energy of n∞5.

fig-1-and-2fig-3Test results

Results for the 64g iron ball drop test

Next, the results of the 95g iron ball drop test.

Using on the test results of Tables 1 to 4, the energy of the ball hitting the glass plate was determined by the following formula according to the height of the drop. The energy applied to the glass specimen was determined as being equal to the potential energy E of the iron ball.

E = mgh

Here, m is the mass (kg) of the iron ball, g is the gravitational acceleration of 9.80665 (m / s2), and h is the drop height (m).

The probability of the glass samples breaking from added energy is summarized respectively in tables 5-8.

Drop height (m) Energy E (J) Failure rate


Figures 4 and 5 summarize these results in the form of figures for each iron ball used in the test.

Using a 50% probability of failure rate from the energy of the impact, with the 64 gram iron ball, Fig. 4 shows that the fracture energy of the untreated material is approximately 0.155 (J) and the fracture energy of the treated material is 0.217 (J).

With the 95 gram iron ball, FIG. 5 shows the breaking energy of the untreated material is 0.105 (J) and the breaking energy of the treated material is 0.186 (J). When these results are combined, it shows that Dglass Coating coating on the glass plates improved the strength by about 1.4 times in the 64 g ball test and about 1.77 times in the 95 g ball test compared to the untreated material.

Conclusion
It was observed that Dglass Coat significantly improved the impact strength of the glass by about 1.4 to 1.7 times.