Combinations of Fourth-Order Elastic Constants of Fused Quartz

Abstract
An evaluation of experiments already performed shows that three equations involving the four fourth‐order room‐temperature elastic stiffnesses of fused quartz have been determined. They are: C111−1.4C1112+0.34C1122+0.23C1123=(5.5±3.5)×1012N/m2C1111+4C1112+2C1122+2C1123=(55±10)×1012N/m2C1111+2C1112−3C1123=(−0.9±0.6)×1012N/m2.