Mechanical Properties of Ceramics

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.