Mechanical Behaviour of safety glasses - Хамгаалалттай шилний механик шинж чанар

1. MECHANICAL BEHAVIOR
OF SAFETY GLASS
GMIT – BACH1
BAT-OCHIR
03/13/18
SUPERVISED BY:
PROF. STEHR

2. OUTLINE
• ANNEALED GLASS
• BASIC TYPES OF WINDOW GLASS
• PROCESSES
• TEMPERED GLASS
• LAMINATED GLASS
• COMPARISON
• APPLICATIONS
• QUESTIONS
• REFERENCES

3. NORMAL / ANNEALED GLASS
• PRODUCES LONG
SHARP SPLINTERS
-TOO BRITTLE
-DANGER OF INJURY
• WHEN NOT ANNEALED,
GLASS IS MORE LIKELY
TO CRACK WHEN
EXPOSED TO
TEMPERATURE
CHANGES

4. BASIC TYPES OF GLASS3
SAFETY
GLASS

5. PROCESSES
Combining two annealed or tempered
glasses together with Polyvinyl Butyral
(PVB)
Bonding these under heat
and pressure
heating annealed glass above its
transition temperature of 564 °C to 620
°C
cooling it rapidly
Heating glass to specific
temperature
cooling at a very slow
and controlled rate
LAMINATED GLASS
TEMPERED GLASS
ANNEALED GLASS
RELIEVES INTERNAL STRESS
STRONGER DUE TO COMPRESSIVE STRESS

6. TEMPERED GLASS
• TEMPERED GLASS
SHATTERS INTO SMALL
PIECES WHEN BROKEN
• LESS LIKELY TO CAUSE
INJURY

7. LAMINATED GLASS
• IN THE EVENT OF
BREAKING, IT IS HELD
IN PLACE BY AN
INTERLAYER, TYPICALLY
OF POLYVINYL BUTYRAL
(PVB)
• SOME OF THEM BLOCKS 99
PERCENT OF THE UV-LIGHT
TRANSMISSION AND REDUCE
SOUND
• THICKER

8. COMPARISON
ANNEALED TEMPERED LAMINATED
STRENGTH BRITTLE
3 OR 4 TIMES
STRONGER
STRONG
SAFETY DANGEROUS SAFE SAFE
COST CHEAP HIGHER
MOST
EXPENSIVE
WHETHER
IT COULD
BE CUT
YES NO NO

9. APPLICATIONS

10. Thanks!
Any questions?

11. REFERENCE
▧ https://en.wikipedia.org/wiki/Safety_glass
▧ https://floydglass.com/tempered-vs-annealed-glass/
▧ https://en.wikipedia.org/wiki/Toughened_glass
▧ https://en.wikipedia.org/wiki/Laminated_glass