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Creep Behavior and Mechanical Properties of Carbon Fiber Nano-Composites

机译：碳纤维纳米复合材料的蠕变行为和力学性能

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In recent years, it has been observed that surface modification of carbon nanotubes (CNTs) influences on CNT's distribution among epoxy resin and affects the mechanical properties of CNTs. Accordingly, the treatment of CNTs to with organic acids to oxidize them generates functional groups on the surface of CNTs. This investigation studies the consequent enhancement of the mechanical properties of CNTs. The influence of adding various proportions of CNTs to the epoxy resin on the mechanical properties of the composites thus formed is investigated, and the strength of the material is tested at different temperatures. The creep behaviors of carbon fiber (CF)/epoxy resin thermosetting composites and CNTs/CF/epoxy resin composites were tested and analyzed at different stresses, orientations of fiber, temperatures and humidities. The creep exhibits only two stages- primary creep and steady-state creep. The effects of creep stress, creep time, and humidity on the creep of composites that contain various proportion of CNTs were investigated at various temperatures. Additionally, increasing the number of cycles in cyclic creep tests at room temperature resulted in a decrease in creep strain even at a high temperature of 55°C. Possible room temperature creep mechanisms have been proposed and discussed. With increasing number of creep tests, the creep strain decreased due to strain hardening which occurred during creep. Creep strain is believed to increase with applied stress, creep time, humidity, temperature and degree of the angle θ between the orientation of fiber and the direction of the applied stress. Moreover, the test results of creep strain of CF/epoxy resin composites and CNTs/CF/epoxy resin composites tested under various conditions can be smoothly fitted by the fitting curves of Findley power law. Finally, the test results also indicate that mechanical strength increase with the amount of CNTs added to the composites. Different coefficients of expansion of the matrix, fiber and CNTs, are such that overexpansion of the matrix at high temperature results in cracking in it. An SEM image of the fracture surface reveals debonding and the pulling out of longitudinal fibers because of poor interfacial bonding between fiber and matrix, which reduce overall strength.
机译：近年来，已经观察到碳纳米管（CNT）的表面改性对环氧树脂中CNT分布的影响，并影响CNT的机械性能。因此，用有机酸处理CNT以氧化它们在CNT的表面上产生官能团。该研究研究了CNT的力学性能的随之提高。研究了在由此形成的复合材料的机械性质上加入各种比例的CNT对环氧树脂的影响，并在不同温度下测试材料的强度。测试碳纤维（CF）/环氧树脂热固性复合材料和CNT / CF /环氧树脂复合材料的蠕变行为，并在不同的应力，纤维方向，温度和湿度方面分析。蠕变表现出两个阶段 - 初级蠕变和稳态蠕变。在各种温度下研究了蠕变应力，蠕变时间和湿度对含有各种比例的复合材料蠕变的影响。另外，在室温下增加循环蠕变试验中的循环次数导致蠕变应变的降低，即使在55℃的高温下也会降低。已经提出并讨论了可能的室温蠕变机制。随着蠕变试验数量的越来越多，由于在蠕变期间发生的应变硬化而导致的蠕变应变降低。据信蠕变应变随着施加的应力，蠕变时间，湿度，温度和角度θ之间的倾角θ的程度而增加和施加应力的方向。此外，在各种条件下测试的CF /环氧树脂复合材料和CNT / CF /环氧树脂复合材料的蠕变菌株的测试结果可以通过Findley Power Lave的配合曲线平稳地安装。最后，测试结果还表明机械强度随着添加到复合材料的CNT的量而增加。基质，纤维和CNT的不同膨胀系数使得基质在高温下的过度截止导致其裂化。由于纤维和基质之间的界面粘合不良，裂缝表面的SEM图像显示出剥离和拉出纵向纤维，这减少了总体强度。

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