Brass is an alloy consisting of copper (Cu) and Zinc (Zn) and exists in two general categories: Red Brass: The two main constituents are Zn at less than 15wt % Cu at greater than 80wt %. This alloy has a red tint because all the Zn is dissolved in the Cu. This material rarely shows […]
Aircraft Windshield Failure Analysis: Due to Edge Damage
Read Consulting was asked to perform a glass failure analysis on a cracked aircraft windshield. This is a laminated windshield contains with heating elements between the glass layers. The outer layer is a piece of 5mm thick annealed glass which cracked during normal use. The failure initiated at a damage site on the edge face […]
Failure Analysis of Broken Vinaigrette Salad Dressing Bottle
Read Consulting failure analysis laboratory performed a glass failure analysis of a broken of vinaigrette salad dressing bottle. The bottle top broke off when the top was being twisted off and injured the user. The integrity of the bottle neck was in question. There was a suspicion of a glass defect in the bottle neck […]
Failure of Plastic Fasteners Due to UV Degradation
Often plastic structures are held together with molded in “clips”. These clips snap into place and hold the structure together. As a result, they see significant stress over their lifetime. Initially the clips operate satisfactorily; however, over time, they can become brittle if exposed to sunlight. The ultra violet wavelength region of natural sunlight may […]
Product Defect, Fatigue Failure of Glass Coffee Pot.
Glass is a brittle material, and it is not expected to fail from fatigue. To test this possibility, a borosilicate glass (i.e. low coefficient of thermal expansion) coffee was selected. The coffee pot bottom was scratched using a wet scrubbing pad It was then thermal “shocked” by heating it to 160° C and plunged […]
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