This note discusses the Timoshenko–Ehrenfest beam theory and the Griffith fracture theory. Both were annunciated in the West in 1921, exactly a century ago. Much progress has been made in these fields. Discussing the deficiencies of the theories might pave way ahead.

中文翻译：

---

力学领域的两个开创性理论百周年

本说明讨论了Timoshenko-Ehrenfest梁理论和Griffith断裂理论。两者都在一个世纪前的1921年在西方宣布。在这些领域已经取得了很大进展。讨论这些理论的不足之处可能会铺平道路。