Ratcheting effect

Ratcheting effect is very important to the safety design and life assessment of engineering structures , and has been widely studied .

棘轮效应给结构安全设计和寿命评估带来严峻挑战，因而已经引起了国内外学者的广泛重视。

However , magnesium alloy structural components inevitably subject to the asymmetric cyclic loadings during the actual service process , and then the ratcheting effect will occur , which severely influence their fatigue performance .

然而，镁合金零部件在实际服役过程中不可避免地承受非对称循环应力，产生棘轮效应，将严重影响其疲劳性能。

A cyclic accumulation of plastic deformation ( i.e. , ratcheting ) will occur in the material when an asymmetrical cyclic stress is applied . Ratcheting effect is important for the safety design and life assessment of engineering structures , which was extensively studied .

材料在非对称循环应力或循环热应力作用下将产生塑性变形的循环累积现象，即棘轮效应，其对工程结构的安全性和寿命评价非常重要，已引起国内外学者的广泛重视。