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本文采用蠕变-振动实验方法,对一种 SMC 短纤维增强复合材料,考察了在不同加载时间和温度下恒载蠕变对其动态力学参量的影响,拟合了该材料的本构关系。实验结果表明:经不同时间和温度下蠕变变形后,其动态弹性模量 E 都产生不同程度的下降,其损耗因子 tgδ都呈上升趋势。随着蠕变时间的延长和温度的提高。它们的相对改变量变化越大。但在常温下动态弹性模量随蠕变时间无明显变化;在随温度上升中,损耗因子对不同的蠕变时间具有相似的变化趋势。
In this paper, a SMC staple fiber reinforced composite was investigated by creep-vibration method. The influence of constant load creep on dynamic mechanical parameters at different loading time and temperature was investigated. The constitutive relation of the material was fitted. The experimental results show that the dynamic modulus of elasticity E decreases with different degrees after creep deformation at different time and temperature, and the loss factor tgδ shows an upward trend. With the creep time and temperature increase. Their relative changes change the greater. However, at room temperature, the dynamic elastic modulus has no obvious change with creep time. In the temperature rise, the loss factor has a similar trend to different creep times.