Composites and Advanced Materials最新文献_第6页

Topology optimization of partial constrained layer damping treatment on plate for maximizing modal loss factors 极大化模态损失因子的板上局部约束层阻尼处理拓扑优化

Composites and Advanced Materials Pub Date : 2021-01-01 DOI: 10.1177/26349833211034879

Ronggeng Chen, Haitao Luo, Hongguang Wang, Weijia Zhou

{"title":"Topology optimization of partial constrained layer damping treatment on plate for maximizing modal loss factors","authors":"Ronggeng Chen, Haitao Luo, Hongguang Wang, Weijia Zhou","doi":"10.1177/26349833211034879","DOIUrl":"https://doi.org/10.1177/26349833211034879","url":null,"abstract":"Constrained layer damping treatment is widely used to suppress the vibration and noise of thin-walled structures. However, full coverage of constrained damping layer will increase unnecessary additional mass, resulting in material waste and cannot effectively improve the damping performance of the composite structure. In this article, a topology optimization approach is proposed to realize the optimal distribution of constrained damping layer. The design objective is to maximize modal loss factors solved by the modal strain energy method under the constraint of volume. Taking the relative density of the finite element of the constrained damping layer as design variable, the solid isotropic material with penalization method is used to realize the optimal topological distribution of the damping material on the surface of the metal substrate. Then the moving asymptote method is adopted as an optimizer to search the optimal layout of the constrained damping layer. Based on a modified modal superposition method, the sensitivities of the objective function with respect to the design variables are obtained. Numerical examples and experiments are presented for illustrating the validity and efficiency of this approach. The results show that the objective function converges to the optimal value smoothly, and the optimized modal loss factors have been significantly improved. The layouts of the constrained damping layer after optimization are clear and reasonable, and its distributions are affected by both the damping layer and the constraining layer. Each part of the constrained damping layer after optimizing can greatly improve the damping performance of the structure.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88389943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Mechanical properties and dissipation energy of carbon black/rubber composites 炭黑/橡胶复合材料的力学性能及耗散能

Composites and Advanced Materials Pub Date : 2021-01-01 DOI: 10.1177/26349833211005476

R. Chollakup, Supitta Suethao, P. Suwanruji, J. Boonyarit, W. Smitthipong

{"title":"Mechanical properties and dissipation energy of carbon black/rubber composites","authors":"R. Chollakup, Supitta Suethao, P. Suwanruji, J. Boonyarit, W. Smitthipong","doi":"10.1177/26349833211005476","DOIUrl":"https://doi.org/10.1177/26349833211005476","url":null,"abstract":"The effects of carbon black on the properties of rubber composites were studied in order to explore their value in producing low rolling resistance truck tires. Carbon black with different grades, N330 (coarser grade of 26–30 nm) and N220 (finer grade of 20–25 nm), was used as a reinforcing agent of natural rubber. The effects of different ratios of carbon black N330 at 40, 45, 50 and 55 parts per hundred rubber (phr) and N220 at 30, 35, 40 and 50 phr were investigated. Rubber composites with N220 had greater rubber/carbon black interaction than those with N330. The Mooney viscosity of rubber composite increased when the carbon black ratio increased. After vulcanisation of rubber, the samples were characterised by dynamic mechanical analysis, tensile strength and heat build-up. The results showed that the strength of rubber composites increased with increasing carbon black ratios. Interestingly, at the same bound rubber level, rubber composites with N220 presented lower dissipation energy, heat build-up and better mechanical properties than those with N330. This study indicated that reinforcement with an optimum amount of carbon black N220 would improve several desirable characteristics of rubber composites when used in low rolling resistance truck tires.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77193851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Microstructure and mechanical properties of Ti-Ti2AlNb interface Ti-Ti2AlNb界面组织与力学性能

Composites and Advanced Materials Pub Date : 2021-01-01 DOI: 10.1177/2633366X20929713

T. Niu, Bo Jiang, Ning Zhang, Yao-qi Wang

{"title":"Microstructure and mechanical properties of Ti-Ti2AlNb interface","authors":"T. Niu, Bo Jiang, Ning Zhang, Yao-qi Wang","doi":"10.1177/2633366X20929713","DOIUrl":"https://doi.org/10.1177/2633366X20929713","url":null,"abstract":"Diffusion bonding of Ti2AlNb alloy using pure titanium (Ti) foil as an interlayer was carried out on superplastic forming and diffusion bonding special equipment by gas pressure loading method. The microstructure of Ti-Ti2AlNb interface was observed using scanning electron microscope and energy-dispersive spectrometer while the mechanical properties of the joints were evaluated by shear test. The results show that the thickness of Ti foil interlayer has a great influence on the microstructure and shear strength of the interface diffusion region. When the thickness of the intermediate layer is thin (25 µm), Ti, aluminum (Al), and niobium (Nb) elements are fully diffused with uniform element distribution through the diffusion region. The diffusion layer region presents uniform, fine, and disordered lamellar α-Ti + β-Ti dual-phase structure with high shear strength. When the thickness of Ti foil interlayer is thick (50 µm), the distribution of Al elements is relatively uniform through the diffusion region due to its smaller radius and faster diffusion speed, and Ti and Nb elements present gradient distribution from the middle to both sides. The diffusion layer region presents a coarse and long strip shape α-Ti + β-Ti dual-phase structure in the middle part and a fine needle-like or irregular α-Ti + β-Ti dual-phase structure in both side parts, with slightly lower shear strength. Temperature has a great influence on the microstructure and mechanical properties of the diffusion bonding joints. The diffusion region presents a black α-Ti strip area in the middle part with the width of about 10 µm at lower temperature (910°C) with poorer property, due to the grain growth of the parent metal, the property is slightly poorer when the temperature is too high (960°C), and the optimal temperature is 930°C with a higher shear strength.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89397744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The researches concern the influence of the helix angle on the composite machining process 研究了螺旋角对复合加工过程的影响

Composites and Advanced Materials Pub Date : 2021-01-01 DOI: 10.1177/2634983321998373

Rongsheng Jiang, Jinxin Wang, Yu Gao, Zhaolong Zhu, P. Cao

引用次数: 2

Tensile and fatigue properties of fiber-reinforced metal matrix composites Cf/5056Al 纤维增强金属基复合材料Cf/5056Al的拉伸和疲劳性能

Composites and Advanced Materials Pub Date : 2021-01-01 DOI: 10.1177/2633366X20929712

Ying Ba, Shu Sun

引用次数: 2

The research on precise forming technology of “λ” type composite skin “λ”型复合蒙皮精密成形技术研究

Composites and Advanced Materials Pub Date : 2021-01-01 DOI: 10.1177/2634983321994749

Q. Guo, K. He, H. Xu, Y. Wen

{"title":"The research on precise forming technology of “λ” type composite skin","authors":"Q. Guo, K. He, H. Xu, Y. Wen","doi":"10.1177/2634983321994749","DOIUrl":"https://doi.org/10.1177/2634983321994749","url":null,"abstract":"With the application of “λ” type composite skin becoming more and more extensive and diversified, its precise forming technology is also widely concerned. This article mainly solves the quality problems of “λ” type corner area, such as delamination dispersion and surface wrinkle, which exist in reality commonly in the manufacturing process. The prepreg is heated along the corner area of the tooling to solve the problem that prepreg is difficult to be compacted due to the large modulus of carbon fiber in “λ” type corner area. Furthermore, two precompaction tests are creatively increased at 16 layers (middle layer) and 32 layers (last layer) for the thick structure, respectively, to ensure the compaction effect of the blank. In addition, combined with the characteristics of highly elastic rubber and carbon fiber-reinforced materials, a new type of soft mold structure with proper flexibility and good stiffness is proposed innovatively through the reasonable placement of carbon fiber-reinforced materials and the setting of exhaust holes according to the structure characteristics of “λ” type root skin. Through further process verification, it is shown that the improved process has effectively solved the problems of wrinkles and internal delamination at the sharp corners of parts and realized zero-defect manufacturing of “λ” type root skin for the first time.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74840844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of machining parameters on micro-motion platform displacement during grinding Al-Mg alloys workpiece assisted by two-dimensional low-frequency vibration 二维低频振动辅助磨削Al-Mg合金工件时加工参数对微动平台位移的影响

Composites and Advanced Materials Pub Date : 2021-01-01 DOI: 10.1177/2633366X20985308

Shi Yu, Shijun Ji, Ji Zhao, Chao Zhang, Handa Dai

引用次数: 0

Sustainability in additive manufacturing: Exploring the mechanical potential of recycled PET filaments 增材制造的可持续性:探索再生PET长丝的机械潜力

Composites and Advanced Materials Pub Date : 2021-01-01 DOI: 10.1177/26349833211000063

Helge Schneevogt, Kevin Stelzner, Buket Yilmaz, B. Abali, A. Klunker, C. Völlmecke

引用次数: 13

Prediction of tool wear in CFRP drilling based on neural network with multicharacteristics and multisignal sources 基于多特征多信号源神经网络的CFRP钻孔刀具磨损预测

Composites and Advanced Materials Pub Date : 2021-01-01 DOI: 10.1177/2633366X20987234

Guoqiang Zhu, S. Hu, Hong-qun Tang

{"title":"Prediction of tool wear in CFRP drilling based on neural network with multicharacteristics and multisignal sources","authors":"Guoqiang Zhu, S. Hu, Hong-qun Tang","doi":"10.1177/2633366X20987234","DOIUrl":"https://doi.org/10.1177/2633366X20987234","url":null,"abstract":"Carbon fiber-reinforced polymer (CFRP) drilling is a typical process in the aircraft industry. Because the components of CFRP are different and uneven, it is difficult to extract tool wear characteristics from the machining signals, which are composed of the processing characteristics of various materials and the tool state characteristics. The aim of this work is to present a new comprehensive approach based on multicharacteristics and multisignal sources to predict the tool wear state during CFRP drilling through a combination of a backpropagation (BP) artificial neural network (ANN) model and an efficient automatic system depending on the sliding window algorithm. It was verified that the peak factor and Kurtosis coefficient of different signals and the energy value of the d5 layer of the thrust force signal and the d3 layer of the vibration signal after wavelet decomposition were related to tool wear. Among them, the energy value of the d3 layer of the vibration signal was selected as the wear indicator and was able to describe the state of the tool during the CFRP drilling process regardless of the drilling conditions and individual tool differences. A confirmatory drilling experiment using 6-mm-diameter polycrystalline diamond twist drilling under different processing parameters was conducted to verify the ANN model based on multicharacteristics and multisignal sources. A lower feed speed and a higher cutting speed were both highly correlated with the VB value of flank wear. Drill wear accelerated because of the occurrence of adhesive wear when the number of drilled holes reached around 90. The accuracy of the neural network model is 80–87% when using the value of only one characteristic but clearly increases based on multicharacteristics and multisignal sources in real time, indicating that the BP ANN model has higher accuracy in predicting the tool state in CFRP drilling through the sensor signal fusion method.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88925683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Structure optimization of woven fabric composites for improvement of mechanical properties using a micromechanics model of woven fabric composites and a genetic algorithm 基于机织复合材料微观力学模型和遗传算法的机织复合材料力学性能优化研究

Composites and Advanced Materials Pub Date : 2021-01-01 DOI: 10.1177/26349833211006114

Gunyong Hwang, Dong Hyun Kim, Myungsoo Kim

{"title":"Structure optimization of woven fabric composites for improvement of mechanical properties using a micromechanics model of woven fabric composites and a genetic algorithm","authors":"Gunyong Hwang, Dong Hyun Kim, Myungsoo Kim","doi":"10.1177/26349833211006114","DOIUrl":"https://doi.org/10.1177/26349833211006114","url":null,"abstract":"This research aims to optimize the mechanical properties of woven fabric composites, especially the elastic modulus. A micromechanics model of woven fabric composites was used to obtain the mechanical properties of the fiber composite, and a genetic algorithm (GA) was employed for the optimization tool. The structure of the fabric fiber was expressed using the width, thickness, and wave pattern of the fiber strands in the woven fabric composites. In the GA, the chromosome string consisted of the thickness and width of the fill and warp strands, and the objective function was determined to maximize the elastic modulus of the composite. Numerical analysis showed that the longitudinal mechanical properties of the strands contributed significantly to the overall elastic modulus of the composites because the longitudinal property was notably larger than the transverse property. Therefore, to improve the in-plane elastic modulus, the resulting geometry of the composites possessed large volumes of related strands with large cross-sectional areas and small strand waviness. However, the numerical results of the out-of-plane elastic modulus generated large strand waviness, which contributed to the fiber alignment in the out-of-plane direction. The findings of this research are expected to be an excellent resource for the structural design of woven fabric composites.","PeriodicalId":10608,"journal":{"name":"Composites and Advanced Materials","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89776546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3