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RISS 인기검색어
- 검색키워드
- 저자 : Can Ni (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Analysis of Honeycomb and Sandwich Structure Compression Property and the Damage of Double Cell Wall
Lihong Xu,Can Ni,Gang Liu,Junli Li 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9
Sandwich structure is widely used in aviation field due to their high out-of-plane compression properties, shear properties, and outstanding energy absorption characteristics. During the forming process, the aluminum honeycomb will form double cell wall because of adhesive layers. The double cell wall has a great influence on the compressive properties, but there are only few researches on it. In this paper, the influence of double cell wall on the compression performance of sandwich structure was studied, and the failure process of double cell was analyzed from micro perspective. Finite element models of aluminum honeycomb and sandwich structure were established in the software ABAQUS. Moreover, the unit model including double cell wall and single cell wall was also established, and then the effectiveness of the simulation was verified by experiments. The compression experiment was carried out on the universal test machine with sandwich structure and the test speed was set as 2 mm/min. The results show that the failure occurs from one end when the aluminum honeycomb faces with flat compression load alone, while the failure of the sandwich structure starts from the middle of the core. The adhesive layer in the double cell wall is subjected to both compressive stress and tensile stress, and the failure occurs first in tension position. Then, the effects of double cell wall different bonding parameters and different panel layering angles on the compressive properties of the structure were studied. The results show that the structural compression performance increases slowly after the bonding length reaches 4 mm, and the bonding thickness less than 0.1 mm has little influence on the compression performance. The fiber orientation of the panel close to the core can be designed to be 90° which is parallel to the double cell wall, which can effectively improve the flat compression performance.
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Analysis and Development of the CFRP Boring Bar for Stability Improvement
Licheng Lu,Can Ni,Gang Liu,Bo Qian,Qinglong An,Zhenzhen Cao,Liqiang Zhang,Junli Li 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12
Boring bars with a large length-to-diameter ratio have become increasingly indispensable for deep hole machining. However, the dynamic performance of conventional boring bars may be inadequate, resulting in vibrations. In this paper, a novel boring bar with composites and a constrained layer damping structure was fabricated to suppress vibrations during the boring operation. Initially, the configuration of the CFRP boring bar was proposed based on theoretical analysis, and then the modal parameters were calculated using the bending strain energy method and cantilever beam theory. Subsequently, the geometric design parameters were optimized analytically using the finite element method. Modal and cutting tests were then conducted to evaluate the cutting stability of a CFRP boring bar with a length-to-diameter ratio of 8.4. The modal parameters, vibration signals, and cutting force signals were measured and compared with a carbide boring bar. The experimental results indicated that there was a significant improvement in the cutting stability of the CFRP boring bar.
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Cao, Fang,Hu, Yong-Wei,Li, Ping,Liu, Ying,Wang, Kuo,Ma, Lei,Li, Peng-Fei,Ni, Can-Rong,Ding, Hou-Zhong Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.8
The incidence of gastric cancer worldwide, and in particular in developing countries, has shown a marked increase. Poor prognosis of gastric cancer patients occurs due to the rapid metastasis of the disease via the lymphatic and blood vessels. The aim of this study was to investigate the expression and the clinical significance of D2-40 and CD34 in human gastric cancer. D2-40 and CD34 expression wasdetected in 1,072 cases of Chinese patients with gastric carcinoma using immunohistochemistry. The lymphatic vessel density (LVD) and microvessel density (MVD) were calculated and analyzed and the correlation with the clinicopathological factors and prognosis was determined. The LVD and MVD of the gastric cancer cases were significantly higher compared to those of normal tissues (P < 0.05). The expression of D2-40-LVD and CD34-MVD in the malignancies were positively related to the age, tumor size, invasion depth, lymphatic metastasis and pathological tumor-node-metastasis (pTNM) (P < 0.05); However, no statistically significant difference was identified between them with the patient gender (P > 0.05). Up-regulation of D2-40 and CD34 expression was significantly correlated with the poor survival rate in univariate and multivariate analyses. The LVD marked by D2-40 and the MVD marked by CD34 were positively correlated to the clinicopathological factors of the malignancies and may play important role in the development and progression of gastric cancer.
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