- #1
marellasunny
- 255
- 3
http://www.glassalchemy.com/media/upload/image/stressfig1.gif
In the manufacturing of glass(flat glass),the outside cools first followed by the inside.So,this means that the outer surfaces compresses on the hot inner surface.What I don't understand is how the tensile stresses are developed on the inner surface?
1.Since the outer surfaces are already compressing on the interior,how can the contraction of the inside still create tensile stresses?http://www.ljstar.com/technical/images/sightglass_image_9.jpg
2.For example in a car windshield :By creating compressive and tensile stresses in such a manner as Fig.2,it would be suitable only for side crashes.The normal force shown would be a car/tree impacting from the side. In case of frontal normal force,my compressive stress aids the normal force.Am I right?
[For the windshield to be suitable for frontal crash,I would need to create compressive stresses at the top and bottom part of the windshield(looking from the front) and tensile stresses in the centre.Which is kind-of weird.]
In the manufacturing of glass(flat glass),the outside cools first followed by the inside.So,this means that the outer surfaces compresses on the hot inner surface.What I don't understand is how the tensile stresses are developed on the inner surface?
1.Since the outer surfaces are already compressing on the interior,how can the contraction of the inside still create tensile stresses?http://www.ljstar.com/technical/images/sightglass_image_9.jpg
2.For example in a car windshield :By creating compressive and tensile stresses in such a manner as Fig.2,it would be suitable only for side crashes.The normal force shown would be a car/tree impacting from the side. In case of frontal normal force,my compressive stress aids the normal force.Am I right?
[For the windshield to be suitable for frontal crash,I would need to create compressive stresses at the top and bottom part of the windshield(looking from the front) and tensile stresses in the centre.Which is kind-of weird.]
Last edited by a moderator: