Physics of Stress Measurements
Stresses cannot be measured directly. Stress determination is made indirectly, e.g. by the measurement of strain. Deformation values obtained from an unbalanced body approaching equilibrium in combination with theoretical knowledge about constitutive behaviour (stress-strain relationship) allows us to evaluate the state of stress existing in any deformable body. The physics of stress measurements can be subdivided into six methodologies (see Table 6.1 ). For rocks and minerals, some modifications of these techniques used in material sciences are required.
KeywordsQuartz Anisotropy Phenol Silicate Petroleum
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