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WINDSHIELD REPAIR RESIN FLEXURAL STRENGTH TEST

Windshield Repair Resin Flexural Strength Test Overview

richard-campfield-nwra-presidents-column-the-crystal-ball

Objective


The purpose of this project was to determine the physical characteristics of the submitted repaired laminated glass by performing impact and penetration tests in accordance with ANSI/SAE Z26.1-1990 and flexural strength tests in 'accordance with ASTM C 158-84.


References


1. Conferences and correspondence with Mr. Richard A. Campfield Commencing November 16, 1993.

2. ANSI/SAE Z26.1-1990, "American National Standard for Safety Glazing Materials for Glazing Motor Vehicles and Motor Vehicle Equipment Operating on Land Highways-Safety Code".

3. ASTM C158-84, "Standard Methods of Flexural Testing of Glass (Determination of Modulus of Rupture)".

FLEXURAL STRENGTH TEST PER ASTM C158-84

Procedure:


Forty, 10 inch long by 1 1/2 inch wide by 1/4 inch thick specimens were placed individually in an Instron Universal testing machine. Five specimens each identi fied .as "6", "8", and "cracked and unrepaired", were tested with the crack in tension (face-down) and five specimens of each sample were tested with the crack in compression (face-up).


The specimens were supported on two bearing edges 8 inches apart. The load was applied through two loading points 4 inches apart and centrally located between the two bearing edges. The load was applied at a constant crosshead rate of compression of 0.50 inches per minute.


Tests were performed on December 20, 1993.

windshield-repair-resin-flexural-strength-testing-results

Observations:



Failures occurred as a result of one or both layers of glass fracturing. All failures occurred at or between the loading points and ran across the width of the specimens.

Observations:


Failures occurred as a result of one or both layers of glass fracturing. All failures occurred at or between the loading points, and ran across the width of the specimens. Any failures which occurred at the repaired crack occurred after the maximum load of the specimen was reached. In no case did the failure at

the repaired crack occur before the maximum load of the specimen was reached. 80% of the failures occurred away from the repaired crack.

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