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Fracture Strength

الكلية كلية هندسة المواد     القسم قسم البوليمرات والصناعات البتروكيمياوية     المرحلة 3
أستاذ المادة قتيبة حسين محمد المرزوكي       6/8/2011 4:35:38 PM

Fracture Strength

Fracture strength is one of the most commonly cited properties for structural ceramics

A number of techniques and methodologies have been developed for the measurement of fracture strength. Most of these techniques equate the fracture strength to the maximum stress (tensile or compressive) at fracture.

 

Consequently, in order for a particular load and specimen geometry to be useful for the determination of fracture strength, the stress distribution must be well established. A complicating factor in the determination of fracture strength is that the strength of ceramic materials is quite sensitive to size, shape, and surface finish. This sensitivity is largely responsible for the wide variation in strength values often reported for a given material.

The primary motivation for testing materials in uniform, uniaxial stress fields is the need to control the stress-state variable to characterize the mechanical behavior of the material at given stress levels. Common methods of controlling the stress states include the application of uniaxial and uniform compressive or tensile stresses to uniformly shaped volumes of material. Use of uniaxial stress tests (tension or compression) has been limited, especially in regard to brittle, structural ceramics, because of the need for elaborate specimen preparation, the need for specialized testing equipment (including specimen grips), and the difficulty of achieving the necessary uniform stress state. Therefore, the flexure bar has traditionally been the popular testing arrangement for ceramics, because of the ease of fabrication of the specimen geometry, the efficient use of material, the simplicity of gripping and loading, and the seemingly straightforward analysis.


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