Study the Mechanical Properties and Fatigue Effect of Multilayer Woven E-Glass/Epoxy Composite under Constant and Variable Loading

Q3 Environmental Science
Saif-Aldeen Ghafel, N. Namer, Abduljabar H. Ali
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引用次数: 1

Abstract

The present work studies the effect of adding woven E-glass fibers [0°/90°], 16 layers with 50% weight fraction to pure epoxy (matrix) on fatigue behavior under constant and variable loadings. The CNC water jet cutting machine was used to cut the composite samples with five fiber direction angles, such as (0°, 5°, 15°, 30°, and 45°). The tensile test was used to determine the composite material’s mechanical properties. The results showed that the composite material with 5° of fiber direction had the highest ultimate tensile stress, i.e., 353 MPa, and the highest Young's Modulus, i.e., 11940 MPa, compared to other samples with angles of (0°, 15°, 30°, 45°) of fiber direction. The sample with 5° angle was adopted in constant and variable fatigue loading tests. The fatigue test results under constant loading showed a 24.8 times fatigue strength improvement for composite material at 107 cycles compared to pure epoxy. The fatigue test under variable loading was conducted with two types of sequence loading program tests at a constant number of cycles at each stress level: high-low sequence loading with stress of 170-130 MPa with 10,000 and 20,000 cycles for each stress level and low-high sequence loading with stress 130-170 MPa with 10,000 and 20,000 cycle for each stress level loading and so on to failure. The results showed that the fatigue life under high-low sequence loading for both 10,000 and 20,000 cycles was less than that of the low-high sequence loading. Also, the results showed that Miner's rules were safe to calculate the damage of composite material used in this work where the damage was above one (D > 1).
多层机织E-玻璃/环氧树脂复合材料在恒载和变载下的力学性能和疲劳效应研究
本工作研究了在纯环氧树脂(基体)中添加0°/90°编织e -玻璃纤维,16层,重量分数为50%,对恒定和可变载荷下疲劳性能的影响。采用数控水射流切割机对复合材料样品进行(0°、5°、15°、30°、45°)5种纤维方向角的切割。通过拉伸试验确定复合材料的力学性能。结果表明:与纤维方向为(0°、15°、30°、45°)的复合材料相比,纤维方向为5°的复合材料的极限拉伸应力最高,为353 MPa,杨氏模量最高,为11940 MPa;恒、变疲劳载荷试验采用5°角试样。恒载疲劳试验结果表明,复合材料在107次循环时的疲劳强度比纯环氧树脂提高了24.8倍。变载荷下的疲劳试验采用两种顺序加载程序,在每个应力水平下进行等次循环试验:高-低顺序加载,应力为170-130 MPa,每个应力水平进行1万次和2万次循环;低-高顺序加载,应力为130-170 MPa,每个应力水平进行1万次和2万次循环,以此类推直至失效。结果表明:1万次和2万次高-低顺序载荷下的疲劳寿命均小于低-高顺序载荷下的疲劳寿命;结果表明,当复合材料的损伤值大于1时,Miner规则对于计算复合材料的损伤是安全的。
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来源期刊
CiteScore
1.50
自引率
0.00%
发文量
56
审稿时长
8 weeks
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