The modified Griffithcriterion is also discussed and the additional condition eq. (23) is given for applying it.
分析了修正 格 氏强度准则，并给出了式（23）作为修正 格 氏准则的适用条件。
2
A boundary 's equation of microcrack region near crack tip of such brittle materials as concrete has been obtained according to the Griffith' s criterion and fracture mechanics.