摘要
研究高、低温环境下聚碳酸酯(polycarbonate,PC)力学性能的变化规律。结果表明:PC的拉伸性能和弯曲性能随环境温度升高呈线性降低关系,且线性相关性较好;环境温度从–40℃升至130℃时,拉伸屈服应力降低近55%,屈服应变降低约63%;环境温度从–70℃升至130℃时,弯曲强度降低了约66%,弯曲模量降低了约37%;不同温度下的拉伸断裂均起源于表面,断口可见明显的镜面区、雾状区和粗糙区;断裂方式由低温的快速脆性断裂转向高温的塑性断裂;冲击强度随环境温度的升高呈现出先增大后减小再增大的趋势;冲击断裂机理存在较大程度的温度差异性,在整个–40~145℃范围内,材料的冲击断口形貌表现出从雾状区到锯齿带再到镜面区,最终软化熔融的一系列变化。
The influences of ambient temperature on mechanical properties of polycarbonate(PC)were investigated.The results show that both tensile properties and flexural properties of PC decrease linearly with the increase of ambient temperature,and the linear correlation is good.When the ambient temperature rises from–40℃to 130℃,the tensile yield stress of PC decreases by nearly 55%and the yield strain decreases by about 63%.When the ambient temperature rises from–70℃to 130℃,the flexural strength of PC decreases by about 66%and the flexural modulus decreases by about 37%.In addition,the fracture morphology indicates that all tensile fractures at different temperatures originate from the surface of PC,and there are obvious mirror areas,fog areas and rough areas on the fracture surface.The fracture mode of PC changes from rapid brittle fracture at low temperature to ductile fracture at high temperature.However,the impact strength of PC increases first,then decreases and then increases with the increase of ambient temperature.The impact fracture mechanism of PC has a large degree of temperature difference.In the whole range of–40-145℃,the impact fracture morphology of PC shows a series of changes from fog zone to sawtooth zone,then to mirror zone,and finally softening and melting.
作者
葛勇
郑静
许雪婷
王韬
孙琦伟
颜悦
GE Yong;ZHENG Jing;XU Xueting;WANG Tao;SUN Qiwei;YAN Yue(AECC Beijing Institute of Aeronautical Materials,Beijing Engineering Research Centre of Advanced Structural Transparencies for the Modern Traffic System,Beijing 100095,China;Information Science Academy of China Electronics Technology Group Corporation,Beijing 100041,China)
出处
《航空材料学报》
CAS
CSCD
北大核心
2023年第3期87-93,共7页
Journal of Aeronautical Materials
关键词
环境温度
聚碳酸酯
力学性能
断口形貌
ambient temperature
polycarbonate
mechanical properties
fracture morphology
