Physics For Civil Engineering: Unit IV: New Engineering Materials
Mechanical Properties of Ceramics
The mechanical behaviour of ceramic phases is determined in a number of ways depending upon how the force is applied: compressive, tensile, transverse, torsional shear or impact.
MECHANICAL PROPERTIES OF CERAMICS
The mechanical behaviour of ceramic
phases is determined in a number of ways depending upon how the force is
applied: compressive, tensile, transverse, torsional shear or impact.
•
Compressive strength: Compressive strength ceramics in
general is many times greater than tensile strength. Therefore, ceramics like
brick, cement, and glass are always used in the compression and not in tension.
• Shear strength:
High shear strengths and low fracture strengths are generally characteristics of ceramics.
Therefore, they commonly fail non-ductile, i.e. in a brittle manner by
fracture.
•
Tensile strength: Tensile strength in ceramics are theoretically high, but in
practice are usually quite low. Failures are often due to stress concentrations
at the pores, grain corner or microcrack.
•
Transverse strength or modulus of rupture: Transverse strength is difficult to ascertain in ceramic
materials. Ceramics are, therefore not used in places 9869100 where transverse
strength of materials is an important criterion.
• Torsional
strength: Torsional strength is seldom considered as a critical
property of ceramics since tensile and cantilever requirements will show the
torsional strength of material.
• Modulus of elasticity: Ceramic materials have high nebbua modulus of elasticity ranging from 7 x 1010 to 42 x 1010 N/m2 which indicates the strength of the bond.
• Plastic deformation: Due to the restricted slip, most
icone of the materials does not permit plastic deformation. The ceramic
materials have greater resistance to slip than to metals.
• Toughness
of Ceramic Materials: Due to presence of benim covalent-ionic
bonding, ceramics have low toughness.
Physics For Civil Engineering: Unit IV: New Engineering Materials : Tag: : - Mechanical Properties of Ceramics
Physics For Civil Engineering: Unit IV: New Engineering Materials
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