【标题】Experimental Evaluation and Neural Network Prediction of Fatigue Life of E-Glass Fiber Reinforced Hybrid Composite Material
【参考中译】玻璃纤维增强混杂复合材料疲劳寿命的试验评估与神经网络预测
【类型】 期刊
【关键词】 ANFIS; Epoxy; Fatigue Life; Glass Fiber; Novolac; Stress
【参考中译】 ANFIS；环氧树脂；疲劳寿命；玻璃纤维；酚醛；应力
【作者】 Alsammarraie A.; Ahmed S.R.; Obaid A.S.Y.
【摘要】 The present study focuses on investigating the impact of hybrid composite content and loading parameters on the fatigue life of E-glass fiber-reinforced composite. A mathematical model of the fatigue life was developed based on experimentation and expressed as a function of the composite content (Epoxy content (80%, 60%) wt., Novolac content (20%, 40%) wt., E-Fiber Glass content (10%, 20%, and 30%) wt.), and different loads using Adaptive Neural Fuzzy Inference Systems (ANFIS). In order to validate the ANFIS model, 30 fatigue cycle experiments were conducted. Using the experimental data sets, the ANFIS was trained with a momentum algorithm and an average absolute percentage error of 6.045% was obtained and compared to the output of the conventional Artificial Neural Network (ANN) Model. The testing accuracy was then verified with 6 extra experimental data sets and the average predicting error was 5.18%. the predicted ANFIS output data were then used to discuss the effect of the composite content and loading parameters on the fatigue life. The number and shapes of cracks observed on the failed specimens were analyzed under an optical microscope. The analysis revealed that the loading impact showed the highest influence on fatigue life for all types of enforcement and the sequence of strength was E-glass fiber, epoxy, and Novolac contents, respectively.
【参考中译】 本文主要研究混杂复合材料含量和加载参数对玻璃纤维增强复合材料疲劳寿命的影响。在试验的基础上建立了疲劳寿命的数学模型，并利用自适应神经模糊推理系统(ANFIS)将其表示为复合材料含量(环氧树脂含量(80%，60%)，酚醛树脂含量(20%，40%)，E-玻璃纤维含量(10%，20%，30%)重量)和不同载荷的函数。为了验证ANFIS模型的有效性，进行了30次疲劳循环试验。利用实验数据集，用动量算法对神经网络进行训练，得到了6.045%的平均绝对误差，并与传统的人工神经网络模型的输出进行了比较。用6组额外的实验数据验证了模型的测试精度，平均预测误差为5.18%。然后利用预测的ANFIS输出数据讨论了复合材料含量和加载参数对疲劳寿命的影响。在光学显微镜下对失效试件上观察到的裂纹数量和形状进行了分析。分析表明，加载冲击对疲劳寿命的影响最大，强度大小依次为E玻璃纤维、环氧树脂和酚醛树脂含量。
【来源】 International review of mechanical engineering 2022, vol.16, no.8
【入库时间】 2023/12/27
【标题】Effects of ceramic material in laser-directed energy deposition of titanium/ceramic functionally graded materials
【参考中译】陶瓷材料在激光诱导沉积钛/陶瓷功能梯度材料中的作用
【关键词】 Ceramic material; Functionally graded material; Laser-directed energy deposition; Orowan strengthening effect; Titanium alloy
【参考中译】 陶瓷材料;梯度功能材料;激光能量沉积; Orowan强化效应;钛合金
【作者】 Zheng W.; Zhang D.; Wu D.; Ma N.; Geng P.
【摘要】 The titanium/ceramic functionally graded materials (FGMs) have much higher wear resistance than traditional titanium alloys, while cracks are easily formed during the manufacturing process. The zirconia-toughened alumina (ZTA) was adopted to suppress the crack and improve the performances in the laser-directed energy deposition (L-DED) of TC4/ZTA FGMs. The mechanisms influencing the microstructure, hardness, and friction wear properties of the ZTA were investigated. The interfacial reactions and solid-state phase transformation during the L-DED process formed TiAl2O5 compounds and nanoscale yttria-stabilized tetragonal zirconia (YSZ) particles in the ZTA-deposited layer, where the β and lamellar martensitic secondary α' phases were increased by Zr. The nano-YSZ particles refined the grains in the ZTA-deposited layer by promoting heterogeneous nucleation and inhibiting grain growth, thereby causing a columnar-to-equiaxed transition. The hardness and friction wear properties increased with an increasing ZTA concentration, which is caused by the fine grain and Orowan strengthening effects of the nano-YSZ particles. Additionally, the better ductility and lower mismatch in the coefficient of thermal expansion of ZTA compared with Al2O3 ceramic were beneficial for crack suppression.
【参考中译】 钛/陶瓷功能梯度材料比传统的钛合金具有更高的耐磨性，但在制造过程中容易产生裂纹。在TC4/ZTA功能梯度材料的激光定向能沉积过程中，采用氧化锆增韧氧化铝抑制裂纹，改善材料的性能。研究了影响ZTA组织、硬度和摩擦磨损性能的机理。在L固相沉积过程中，界面反应和固相转变在沉积层中形成了TiAl2O5化合物和纳米级的Y稳定的四方氧化锆颗粒，其中β和片状马氏体二次α‘’相被增加。纳米YSZ颗粒通过促进异质形核和抑制晶粒长大细化了ZTA沉积层中的晶粒，从而导致了柱状晶向等轴晶的转变。硬度和摩擦磨损性能随着ZTA含量的增加而提高，这是由于纳米YSZ颗粒的细晶和奥罗旺强化作用所致。此外，与Al_2O_3陶瓷相比，ZTA陶瓷具有更好的延展性和较低的热膨胀系数失配，有利于裂纹的抑制。
【来源】 Journal of Materials Processing Technology 2023, vol.317
【标题】Research on mechanical properties of ink‐jet, UV‐thermal dual‐cured 3D printing materials and a comparison of the properties of ink‐jet, LCD and UV‐thermal dual‐cured 3D printing materials
【参考中译】喷墨、光热双固化3D打印材料的力学性能研究及喷墨、液晶和光热双固化3D打印材料的性能比较
【关键词】 dissipated energy; ink‐jet 3D printing; LCD 3D printing; photosensitive polymer; UV‐thermal dual‐cured materials
【参考中译】 耗散能量；喷墨3D打印；LCD 3D打印；光敏聚合物；紫外光热双固化材料
【作者】 Huagen Xu; Muchao Qu; Qiancheng Yang; Baoquan Chen
【摘要】 In this work, ink‐jet 3D printing materials were developed and investigated. Additionally, a UV‐thermal dual‐curable prepolymer was synthesized and introduced into liquid crystal display (LCD) 3D printing material. Subsequently, a UV‐thermal dual‐cured 3D printing material was developed as well. The different light stabilizers, photoinitiator content and different thermal annealing time were studied to reveal these effects on the mechanical properties of the ink‐jet 3D printed samples. FTIR was used to analyze the deblocking effect of blocked isocyanate in the synthesized resin. The mechanical properties of the UV‐thermal dual‐cured materials at different thermal annealing time and different ratios of UV content to thermal content were discussed. Scanning electron microscopy (SEM) was utilized to reveal the microscopic morphology of UV‐thermal dual‐cured material before and after thermal annealing. Finally, the dissipated energies of different 3D printing materials were revealed to indicate the difference in internal structure between ink‐jet, LCD and UV‐thermal dual‐cured 3D printing materials.
【参考中译】 本文对喷墨3D打印材料进行了开发和研究。此外，还合成了一种紫外热双固化预聚体，并将其引入到液晶显示3D打印材料中。随后，还研制了一种紫外热双固化3D打印材料。研究了不同的光稳定剂、光引发剂用量和不同的热处理时间对喷墨3D打印样品力学性能的影响。用FTIR分析了合成树脂中封闭型异氰酸酯的解封效果。讨论了不同热退火时间和不同UV/热含量比条件下紫外光-热双固化材料的力学性能。利用扫描电子显微镜(SEM)观察了紫外光-热双固化材料在热处理前后的微观形貌。最后，揭示了不同3D打印材料的能量耗散情况，揭示了喷墨、液晶和紫外热双固化3D打印材料内部结构的差异。
【来源】 Polymers for advanced technologies 2023, vol.34, no.9