中文摘要：

塑木复合材料在动态载荷作用下，其断裂损伤并非纯疲劳或纯蠕变作用的结果。利用交变载荷的试验方法，研究了在疲劳／蠕变交互作用下塑木复合材料的断裂损伤行为。结果表明，在交变载荷为破坏载荷的80％和60％时，其疲劳／蠕变断裂曲线为三段式曲线，即瞬时弹性变形阶段、延迟弹性变形阶段和加速断裂阶段；在交变载荷为破坏载荷的40％时，38h内其疲劳／蠕变曲线为两段式曲线。随着最大载荷保持时间的增加，塑木复合材料进入延迟弹性变形阶段越晚，弯曲挠度增加越快，断裂寿命降低。

英文摘要：

The fracture damage of wood/plastics composite （WPC） was not only the result of the action by fatigue or creep under dynamic load. The fracture damage behavior of WPC composite under the mutual action of fatigue and creep was studied by means of ahemating load test. The results showed when the alternating loads were 80% and 60% of the damaging loads, the fracture curves of fatigue/creep had three stages, namely, transient elastic deformation stage, delayed elastic deformation stage and accelerated fracture stage ; when the alternating load was 40% of the damaging loads, the fracture curves of fatigue/creep had foregoing two stages within 38 h. The delayed elastic deformation stage came later, the bend deflection increased more quickly, and breaking life shortened with the increase of the prolongation of the maximum load hold time.