论文部分内容阅读
分别在大气与氯离子浸泡环境下,测试不同试验周期下玻璃纤维增强不饱和树脂基复合材料(GFRP)片材的蠕变,分析不同环境和应力水平对GFRP蠕变的影响。研究结果表明:GFRP的蠕变率在试验前期增长较快,后期较慢;GFRP蠕变特性与加载应力水平、环境有关,相同环境下加载应力越大,蠕变应变增量越大;在相同应力水平作用下,氯离子环境下GFRP蠕变应变大于大气环境;水分的吸收和扩散使得树脂体积膨胀产生剪应力,与玻璃纤维发生脱黏,引起界面破坏,从而降低GFRP的黏弹性能;树脂与水分子发生化学反应,导致树脂中的化学介质解析出来,其基体中出现坑洼,破坏纤维与树脂界面的完整性,进而降低GFRP的黏弹性能。基于Kelvin标准线固性蠕变模型,考虑环境、应力变化幅值,提出GFRP蠕变预测模型及其适用性。
The creep of glass fiber reinforced unsaturated resin matrix composites (GFRP) sheets under different test cycles was tested under atmospheric and chloride immersion conditions respectively. The effects of different environmental and stress levels on GFRP creep were analyzed. The results show that the creep rate of GFRP increases rapidly at the early stage of the experiment, and is slow in the late stage. The creep behavior of GFRP is related to the stress level and environment of the GFRP. The greater the loading stress under the same environment, the greater the creep strain increment. Under the stress level, the creep strain of GFRP under chloride environment is larger than that of the atmosphere. The absorption and diffusion of water cause the volume expansion of the resin to produce shear stress, debonding with the glass fiber and causing interface damage, thus reducing the viscoelastic property of GFRP. Chemical reaction with water molecules, resulting in the analysis of the resin in the chemical medium, the matrix potholes appear to destroy the integrity of the fiber and resin interface, thus reducing the viscoelastic properties of GFRP. Based on the Kelvin standard linear creep model, the GFRP creep prediction model and its applicability are proposed considering the magnitude of environmental and stress changes.