1. The meaning and background of topic selection for the graduation project (the content is Song style small four, 300-500 words are recommended)
In recent years, with the improvement of people's clothing requirements and the shortening of clothing update cycle, people's clothing pursues personalized strengthening and life Changes in the way, bring the growing demand of the fabric market. Coupled with the development of new fabrics and multifunctional fabrics, the multi-layer composite fabric technology is also developing in an all-round way with the external situation. With the improvement of multi-layer composite fabric equipment and the invention of multi-layer composite fabric additives, the current development of multi-layer composite fabric technology has shortened the finishing process and accelerated processing speed; the process is more reasonable; the final setting is emphasized; more attention is paid to wearability; Give full play to the five main characteristics of equipment function and reasonable maintenance of equipment.
The purpose of multi-layer composite fabrics is to standardize textiles; improve the feel of textiles; change the appearance of textiles; endow textiles with certain special functions, and its content is very rich. In general, it is to make fabrics "perfect" or "functional. Multilayer Composite fabrics have a great influence on fabrics, such as stretching, draping, breathability, wrinkles, wear resistance, color fastness, static electricity, etc. This article is based on the characteristics of foreign multilayer composite fabrics and China's multilayer composite fabrics. The development process of fabrics, discussing the influence of multi-layer composite fabrics on the properties of various fabrics, and explaining the comprehensive development of multi-layer composite fabric technology from multiple perspectives. 2. The main content and technical indicators of the graduation project (the content
is Song style small four)
(1) Use the method of cluster analysis to carry out non-standardized classification of textiles and multi-layer composite fabrics, in order to achieve the purpose of formulating optimized standardized test methods. (2) Determine the
detection indicators, test environment, experimental sample size and The rationality of adding supporting auxiliary materials and the size of auxiliary materials.
(3) Observe and analyze the problems existing in the low-speed impact test process of textiles and multi-layer composite fabrics, and propose solutions to these problems, and use the impact experiments of different types of materials Verify the rationality and reliability of the proposed test method.
(4)Use the established standardized test method to study the relationship between the compression performance and impact protection performance of warp-knitted spacer fabrics.
Use SPSS software to perform multiple linear regression on parameters such as compression elasticity index and low-speed impact residual impact load value, study the relationship between various parameters in the compression process and residual impact load value, establish an impact energy absorption model, and analyze and study the compression performance and impact protection performance of materials relation.
3. Key issues and difficulties in the graduation project (the content is Song style small four, it is recommended to be within 300 words) (
1) Aiming at low-velocity impact human body protection, based on the SHLJ-LSIT-O1 low-velocity impact tester, it is proposed to characterize the low-velocity impact resistance of materials Six indicators of impact performance ("Residual impact load", "Peak duration", "Peak impact acceleration", "Material damage", "System absorbed energy" and "Material absorbed energy"), giving physical meanings to each indicator , from the test index to further clarify the object to ensure the accuracy and comparability of the low-speed impact test standard.
(2) Based on the existing SHLJ-LSIT-O1 low-speed impact tester, according to the low-speed impact characteristics of various types of textiles and multi-layer composite fabrics, cluster analysis theory is used to classify them non-standardized, and for different According to different types of materials and different impact conditions, a standardized test method for low-velocity impact of textiles and multi-layer composite fabrics is initially proposed, which lays an experimental foundation for the standard study of low-velocity impact resistance and human protection effectiveness of materials.
(3) Based on the established low-velocity impact standardized test method, the compression performance and impact protection performance of warp-knitted spacer fabrics were studied, and it was proposed that the impact protection performance of the material could be preliminarily predicted by testing its compression characteristics, and the subsequent development of warp-knitted spacer fabrics as human body Protective materials are of positive significance.
4. Formulation of the graduation design plan (overall plan diagram and its related calculations, or research plan, and development plan) (the content should be in Song style primary four, and it is recommended to be within 1000 words)
本课题从测试条件、样品归类、辅助材料的选择、测试方法等方面开展冲击试验、理论分析和实验论证，尝试建立纺织品与多层复合织物低速冲击性能的标准化测试方法，并基于该测试方法对经编间隔织物的压缩性能和冲击防护性能进行系统性表征和研究分析。主要研究内容包括四个方面：
(1)在前期设计完成的新型冲击防护检测仪器的基础上，提出可用于冲击防护测试的6个检测指标：“剩余冲击载荷”、“峰值持续时间”、“冲击加速度峰值”、“材
Material damage", "system absorbed energy" and "material absorbed energy", these six indicators can be used as common detection items to characterize the impact isolation protection ability of materials; The relationship between the change of layer thickness and the residual impact load. Under the experimental conditions of this paper, the following experimental results are obtained: the increase or decrease of the size of the general flexible material has little effect on the value of the residual impact load, while the change of the size of the rigid material will cause The residual impact load changes. When the side length of the square rigid material increases to 10cm, the residual load value changes slowly with the increase in size. In order to facilitate the experimental operation, the sample specification of this paper is uniformly set as a square with a side length of 10cm; The size change and layer number increase or decrease of the silica gel buffer layer will affect the remaining impact load test data, but for the qualitative comparison test, the change of the silica gel buffer layer will not have a substantial impact on the experimental results, so based on the protection sensor Purpose, the impact test of this thesis adds at least one layer of square silica gel buffer layer with a side length of 12cm.
(3) According to the low-speed impact characteristics of textiles and multi-layer composite fabrics, the test materials are classified by cluster analysis (SPSS software) .Through the classification management of samples, set and improve the test methods applicable to each category, so as to realize the standardization of relevant test methods. In this paper, solutions are proposed according to the problems existing in the impact test process of various materials, and are verified by experiments Accuracy and rationality, classification and development of test methods suitable for various textiles and multi-layer composite fabrics.
(4) Based on standardized test methods, the relationship between the compression performance and impact protection performance of warp-knitted spacer fabrics is studied. Through low-speed impact experiments , it was found that the compression properties of warp-knitted spacer fabrics are correlated with their low-velocity impact protection performance, and the relationship model between parameters such as compression elastic modulus and residual impact load value was established by multiple linear regression, and the results showed that this model can effectively predict the elastic compression of samples The relationship between the modulus parameter and the remaining impact load value.
V. Graduation design plan progress (content is Song style small four)
serial number content and required start and end time
1 Determine the direction of the thesis, write the opening report and literature review 2023-3-01 ~2023-3-19
2 Internship preparations, collecting relevant information 2023-3-22~2023-3-26:
3 Complete the first three chapters of the thesis 2023-3-29~2023-5-02
4 Complete the first draft of the thesis 2023-5-02~2023-5 -09
5 Revise and submit the second draft of the thesis based on the instructor's comments and comments 2023-5-17~2023-5-29
6 The thesis is formed, the instructor comments and revises and finalizes 2023-5-30~2023-5-31
6. References (at least 15 articles, the repetition of the references in the task book shall not exceed one-third, and the content is Song style small four)
[1] Wang Dongqing. Effects of flame-retardant finishing on the weaving and performance of pure cotton and pure polyester Research on Influence [D]. Qingdao: Qingdao University, 2012.
[2] Guo Ning. The Effect of Post-treatment Process on the Hand Style of Polyester Fabrics [D]. Shanghai: Donghua University, 2018. [
3] Zhang Yongjiu, Feng Aifen, Zu Yidan, Li Junxing. Water and oil repellent finishing of wool fabrics and its influence on weaving and performance [J]. "Wool Textile Science and Technology", 2019 (06), p. 231. [4] Kang Li. Fabric structure and
multi- The effect of multi-layer composite fabric on fabric strength [J]. "Sichuan Textile Science and Technology", 2019 (04), pp. 22-23. [5]
Bao Lihua, Zhou Jingyi, Chen Fang. The influence of water-repellent finishing on fabric style [J] . "Textile Science Research Technology", 2019 (09), p. 93.
[6] Chen Zhiming, Zhang Qijun. The Effect of Functional Finishing on the Thermal and Moisture Comfort Properties of Fabrics [N]. Journal of Shanghai University of Engineering Technology, 2019-06-15 , (3).
[7] Zhang Zhengyi, Zhang Peihua. Research on wet treatment of milk fiber/cotton blended knitted fabric and multi-layer composite fabric [N]. International Textile Herald, 2018-01-15, (2). [8
] Li Xueyan. Research on environmentally friendly flame-retardant multi-layer composite fabric of nylon 66 fabric [D]. Beijing: Beijing University of Chemical Technology, 2018. [
9] Wang Zhangming, Zhang Youmei. Changes in mechanical properties and hand feeling of polyester fabric through multi-layer composite fabric [J]. "Silk Technology", 2018(10), pp. 1-3.
[10] Sun Jie, He Jiangping, Zhai Ruigen, Zhao Jianhua. Research on the influence of neutral cellulase finishing on the weaving and performance of mercerized cotton [J]. " Printing and Dyeing Auxiliaries", 2019 (01), pp. 17-21.
[11] Ling Qunmin, Tan Lei. Effect of multi-layer composite fabric technology on the knitting and performance of pure ramie [J]. "Journal of Textile Science", 2020 (7 ), p. 39.
[12] Li Tingting. Preparation of silicon fluorine water and oil repellent finishing agent and its application to wool fabrics [D]. Suzhou: Soochow University, 2018. [13] Li Tingting, Li Yanwen, Jiang Yaoxing. Water and oil repellent finishing on
worsted The influence of wool weaving and performance [J]. "Printing and Dyeing Auxiliaries", 2018 (10), p. 20. [14] Wu Jian, Wang Qian.
Proceedings of the 27th National Wool Spinning Annual Conference - Improving nitrile/polyester fabrics Analysis of Pilling Resistance [C]. Shanghai: Shanghai Translation Publishing House, 2017.
[15] Cao Jing. Research on Super Soft Finishing Technology of Pure Cotton Fabrics [D]. Wuxi: Jiangnan University, 2018.
[16] Yu Zhicheng, Yang Li. The effect of citric acid wrinkle-resistant finishing on the dyeing properties of silk fabrics [J]. "Silk", 2008 (8), pp. 141-143. [17] Chen Yanfeng, Tian Ning. The Ninth Copper Bull Cup Functional
Textiles And Nanotechnology Symposium Proceedings-On the Effect of Multilayer Composite Fabric on the Brightness of Cashmere Fabric [C]. Beijing: Beijing Science and Technology Press, 2019. [18] He Liangzhen. Multilayer Composite Fabric Processing of Polyester Black Fabric [J
] ]. "Dyeing and Finishing Technology", 2019(08), pp. 19-22.
[19] Wang L . Performance Testing of Textiles: Methods, Technology and Applications. 2016.
[20]Shaw JH , Rajan VP , Blacklock M , et al. Towards Virtual Testing of Textile Composites: Calibration of Thermoelastic Tow Properties[J]. Journal of the American Ceramic Society, 2014, 97(4):1209-1217.
[21]Bolick R L , Kelkar A D , Taylor J A . PERFORMANCE EVALUATION OF UNSTITCHED, STITCHED AND Z-PINNED TEXTILE COMPOSITES UNDER STATIC LOADING[C]// Recent Advances in Solids and Structures 2005. Department of Mechanical Engineering North Carolina A & T State University 626 McNair Hall, 1601 E Market Street Greensboro, North Carolina, 27411, USA, 2005.