摘要
通过对直径16、22、25mill玻璃纤维增强复合材料（GFRP）筋在20—180℃及22mmGFRP筋在200～320℃的拉伸试验，分析了三种直径筋体在高温环境下拉伸力学性能的变化规律。结果表明，GFRP筋极限拉伸强度、极限延伸率、弹性模量随温度升高而下降；直径越大，极限拉伸强度、极限延伸率降幅越大，弹性模量降幅差别不大。180℃时，三种直径筋体的极限拉伸强度相比20℃分别下降了33．64％、36．30％、51．84％；极限延伸率下降了41．97％、49．32％、60．67％。20～40℃内应力-应变曲线近似双折线，60～100℃近似直线。100℃时，三种直径筋体的弹性模量与常温比下降了24．46％、21．57％、21．28％。模拟出三种直径在高温环境下极限拉伸强度与常温比较的折减系数与温度的函数关系，100℃以内弹性模量与温度呈双折线关系。
This paper revealed the mechanical behaviors of glass fiber-reinforced polymer （GFRP） bars with different diameters at elevated temperatures. GFRP bars with diameters of 16/22/25 mm were investigated by tensile tests at a temperature range of from 20 ℃ to 180 ℃. Further tensile tests were conducted on GFRP bars with 22 mm,diameter at 200 ℃ to 320 ℃. The results show that the ultimate tensile strength, ultimate strain and elastic modulus decrease with increasing temperature; the ultimate tensile strength and the ultimate strain increase with increasing diameter. The elastic modulus of three bars with different diameters decrease slightly; the ultimate tensile strengths of the three bars decrease by 33.64%, 36. 30%, 51.84%, respectively, and the ultimate strains decrease by 41.97%, 49. 32%, 60. 67% at 180 ℃, respectively. The stress-strain curve is similar to the bilinear at 20 ℃ to 40 ℃, and it is approximately line at 60 ℃ to 100 ℃. The elastic modulus decrease by 24. 46%, 21.57%, 21.28%, respectively, compared to the situation at room temperature. The reduction factor of the ultimate tensile strength shows a function at elevated temperatures, the elastic modulus is a bilinear within 100 ℃.
出处
《塑料工业》
CAS
CSCD
北大核心
2016年第9期95-99,共5页
China Plastics Industry
基金
国家自然科学基金资助项目(51278391)
武汉市城建委科技计划项目(201553)
关键词
GFRP筋
高温
直径
拉伸试验
力学性能
Glass Fiber-reinforced Polymer Bar
Elevated Temperature
Diameter
Tensile Test
Mechanical Property
