Ceramics Best Strength Measurement

Adams measurement of biaxial compressive strength of ceramics proceedings of the 1971 international conference on mechanical behavior of materials japan volume 5 1972 pp.

Ceramics best strength measurement.

Measurement of tensile strength of ceramics t. They are lighter than stainless steel 8 g cc and titanium 4 5g cc. It is ideal for applications that require dimensional stability high thermal stability and low thermal expansion in forms that can be made to very tight tolerances. The surface is subjected to a standard pressure for a standard length of time by means of a pyramid shaped diamond.

Alumina for example has a tensile strength of 20 000 psi 1138 mpa while the compressive strength is 350 000 psi 2400 mpa. It is the method used for measuring the resistance of the ceramics and metals. Its high strength and toughness make it the material of choice for automotive and bearing applications. Ceramics tend to be weak in tension but strong in compression.

For a metal the compressive strength is near that of the tensile strength while for a ceramic the compressive strength may be 10 times the tensile strength. Silicon nitride has the best combination of mechanical thermal and electrical properties of any advanced technical ceramic material. Tensile testing is difficult to perform directly upon certain brittle materials such as glass and ceramics. If the material is substantially stronger in compression than tension failure initiates on the tensile side of the member and hence.

Although these tests yielded reliable reproducible tensile strength data replacing thcm with siniplcr less expensive tests is obviously desirable. Wilshaw tiieitsureiiierits of the tensile fracture strengths of very brittle materials have resulted in the development of some expensive and complicated testing techniques. This notc analyzes a. Therefore a ceramic watch is light on the wrist and is comfortable to wear.

Ceramics are light usually ranging from 2 to 6 g cc most of them being around 3 g cc. In such cases a measure of the tensile strength of the material may be obtained by performing a bend test in which tensile stretching stresses develop on one side of the bent member and corresponding compressive stresses develop on the opposite side.