Characterization of mechanical properties and failure of potassium dihydrogen phosphate under mechanical stressing

SY Yang and LC Zhang, CERAMICS INTERNATIONAL, 47, 15875-15882 (2021).

DOI: 10.1016/j.ceramint.2021.02.162

Potassium dihydrogen phosphate (KDP) is an important material to a range of technological fields owing to its unique optical and physical properties, such as its frequency-doubling, high efficiency in nonlinear conversion and excellent photoelectric and piezoelectric capabilities. However, the basic mechanical constants of this material have never been accurately determined, and its failure mechanisms, too, have not been properly revealed. This paper aims to determine precisely the complete set of mechanical constants of KDP and investigate its failure mechanisms when the material is subjected to a variety of loading conditions. It was identified that the 6 independent mechanical constants C11, C33, C12, C13, C44 and C66 of KDP are 50.36, 50.67, -4.08, 12.58, 9.99 and 2.84 GPa, respectively; its Poisson?s ratio ? is 0.24, its bulk modulus K and shear modulus G are 21.17 and 13.27 GPa, respectively; and its elastic moduli in the 100 001 100 010 001 direction. It was also found that the deformation of KDP under a uniaxial or a biaxial strain is due to the rotation of the tetrahedron PO4 groups.

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