中文摘要：

为了对疲劳与循环蠕变交互作用下的损伤进行定量描述,采用一种考虑应变比率和弹性模量2个参数共同描述损伤的变量,并建立了损伤力学模型,该模型能够综合表现疲劳循环过程中塑性应变变化和弹性模量变化规律。通过对竹木复合层合板在80%、75%和70%3种应力水平下的纯疲劳弯曲试验,得出其损伤变量变化规律的实验曲线。通过对力学模型进行分段求解的方法,得到了竹木复合层合板在疲劳与循环蠕变交互作用下的累积损伤的拟合曲线。结果表明,该损伤参量及损伤模型可以较准确的描述在疲劳与循环蠕变交互作用下竹木复合层合板的损伤累积变化规律。

英文摘要：

In order to quantitatively describe the damage of interaction between fatigue and cyclic creep,a new damage parameter considered stress rate and elasticity modulus rate was proposed to define the damage variable.An accumulated damage mechanics model was put forward,which can describe the stress rate transformation law and elasticity modulus rate transformation law.By a series of bending cyclic tests of wood-bamboo laminate under 80%,75%,and 70% stress levels,transformation laws' curves of the damage variabl...