成型过程中玻璃纤维经编无屈曲织物的剪切及适形行为分析与表征
发布时间：2024-02-28 18:05
本文研究了适形过程中织物变形的主要机理。研究对象为采用玻璃纤维粗纱多方向多层排列而形成的多轴向经编结构织物。实验方法采用单轴偏置拉伸法(UBE)和相框固定拉伸法对织物的剪切行为进行了实验表征,同时采用双圆顶冲压结构装置对织物的适形行为进行了测试。课题中的实验织物由常州宏发纵横新材料科技股份有限公司(PGTEX)提供,织物结构为经编无屈曲织物(WKNCFs)。此外,为了研究相关织物的剪切和适形悬垂性能,搭建并制备了两种实验装置,即用于平面内剪切测试的相框固定装置和用于织物悬垂研究的双圆顶冲压组件。为了比较具有较高面密度织物的剪切性能,基于偏轴拉伸实验表征了织物在平面内的剪切刚度模量。为了表征织物的剪切性能,建立了面内剪切刚度模量作为剪切角的函数的应力方程。此外,分析了织物中捆绑线花型对剪切行为的影响,实验结果发现,具有经平捆绑线结构的单轴向经编织物(UD)和0/90°双轴向(LT)织物的剪切力变化具有相同的趋势。但是,剪切力的差值取决于这两种织物的两层之间的重量分布。单轴向织物的剪切力较高,原因为主要重量来自于单向一层纱线;而双轴向织物的剪切力较低,原因为织物每层纱线几乎重量相等。在捆绑...
【文章页数】：133 页
【学位级别】：博士
【文章目录】：
摘要
Abstract
Symbols and abbreviations
1 Introduction and Objective
1.1 Overview
1.2 Problem of statements
1.3 Goals and objectives
1.4 Innovation points
1.5 Limitations
1.6 Procedures
1.7 Organization of chapters
2 Literature Review
2.1 Textile forming in composite manufacturing
2.2 Textiles as composite reinforcements
2.2.1 Weft knitting technique from traditional structures to NCFs
2.3 Weft knitted plain fabric structures
2.4 Weft knitted with inlaid Yarn (UD, Biaxial, and multi-axial structures)
2.4.1 Warp knitting technique from traditional structures to NCFs
2.5 Full-width weft insertion
2.6 Multi-axial Warp Knitting
2.7 Fabric behavior during forming
2.7.1 Deformation modes (mechanisms)
2.7.2 Forming defects
2.8 Drape behavior characterization
2.9 In-plane shear experimental characterization methods
2.9.1 Shear
2.9.2 Uniaxial bias extension test
2.9.3 Picture frame test
2.10 Experimental characterization of drape behavior
2.11 Shear and Drape simulation (Modeling)
3 In-plane shear behavior based on bias extension experiment
3.1 Introduction
3.2 Uniaxial Bias Extension test(UBE)
3.3 Experiment
3.3.1 Materials
3.3.2 Methods
3.3.3 Test setups
3.3.4 Shear force normalization and data processing
3.4 Results
3.4.1 Stress-strain curves
3.4.2 Force-shear angle curves(in radian)
3.4.3 A Polynomial function of normalized shear force:
3.4.4 Stress functions and curves
3.4.5 In-plane shear rigidity modulus functions and curves
3.5 Discussion
3.5.1 Force-displacement curves
3.5.2 UD and LT fabrics
3.5.3 DB fabric
3.5.4 DBL tri-axial fabric
3.5.5 DBT tri-axial fabric
3.6 Summary
4 In-Plane Shear Behavior Based on Picture Frame Method
4.1 Introduction
4.2 Picture frame test(PF)
4.3 Materials and Methods
4.3.1 Materials
4.3.2 Methods
4.3.3 Test setups
4.3.4 Testing protocol(data processing;normalization and fitting)
4.4 Experimental results
4.5 Discussion
4.5.1 Effect of shearing cycle on shear behavior
4.6 Uni-Directional with tricot stitch fabric (UD-t)
4.7 Double axial tricot stitch fabric 0°/90° (LT-t)
4.8 DB-c in Stitch Compression configuration (SC)
4.9 DB-c in Stitch Tension configuration (ST)
4.9.1 In-plane shear rigidity modulus
4.10 Summary
Appendix A:Fitting stress curves data Using Origin Pro?2017 Software:
5 Wrinkling Behavior Based on double-dome draping geometry
5.1 Introduction
5.2 WKNCFs parameters as reinforcements:
5.3 Forming behavior of the reinforcements
5.4 Drapeability and Double-dome Drapeability test(DDD)
5.5 Materials
5.6 Methods and Experimental setups
5.7 Results and discussion
5.7.1 Defect formation mechanics and code
5.7.2 Stitch mechanics(stitching pattern mechanics),asymmetrical behavior
5.7.3 Tricot stitch
5.8 Stitch tension
5.8.1 The possible locations of the defects
5.8.2 Quadriaxial WKNCF (QX-t)
5.8.3 Tri-axial WKNCF (DBL-t and DBT-c)
5.8.4 Bi-axial WKNCF (LT-t and DB-c)
5.8.5 Mono-axial WKNCF (UD-t)
5.9 summary and outlook
6 Conclusions and future work suggestions
6.1 New contributions
6.2 Recommendations and future work suggestions
7 References
8 List of Publications and achievements
Acknowledgements
本文编号：3913830
【文章页数】：133 页
【学位级别】：博士
【文章目录】：
摘要
Abstract
Symbols and abbreviations
1 Introduction and Objective
1.1 Overview
1.2 Problem of statements
1.3 Goals and objectives
1.4 Innovation points
1.5 Limitations
1.6 Procedures
1.7 Organization of chapters
2 Literature Review
2.1 Textile forming in composite manufacturing
2.2 Textiles as composite reinforcements
2.2.1 Weft knitting technique from traditional structures to NCFs
2.3 Weft knitted plain fabric structures
2.4 Weft knitted with inlaid Yarn (UD, Biaxial, and multi-axial structures)
2.4.1 Warp knitting technique from traditional structures to NCFs
2.5 Full-width weft insertion
2.6 Multi-axial Warp Knitting
2.7 Fabric behavior during forming
2.7.1 Deformation modes (mechanisms)
2.7.2 Forming defects
2.8 Drape behavior characterization
2.9 In-plane shear experimental characterization methods
2.9.1 Shear
2.9.2 Uniaxial bias extension test
2.9.3 Picture frame test
2.10 Experimental characterization of drape behavior
2.11 Shear and Drape simulation (Modeling)
3 In-plane shear behavior based on bias extension experiment
3.1 Introduction
3.2 Uniaxial Bias Extension test(UBE)
3.3 Experiment
3.3.1 Materials
3.3.2 Methods
3.3.3 Test setups
3.3.4 Shear force normalization and data processing
3.4 Results
3.4.1 Stress-strain curves
3.4.2 Force-shear angle curves(in radian)
3.4.3 A Polynomial function of normalized shear force:
3.4.4 Stress functions and curves
3.4.5 In-plane shear rigidity modulus functions and curves
3.5 Discussion
3.5.1 Force-displacement curves
3.5.2 UD and LT fabrics
3.5.3 DB fabric
3.5.4 DBL tri-axial fabric
3.5.5 DBT tri-axial fabric
3.6 Summary
4 In-Plane Shear Behavior Based on Picture Frame Method
4.1 Introduction
4.2 Picture frame test(PF)
4.3 Materials and Methods
4.3.1 Materials
4.3.2 Methods
4.3.3 Test setups
4.3.4 Testing protocol(data processing;normalization and fitting)
4.4 Experimental results
4.5 Discussion
4.5.1 Effect of shearing cycle on shear behavior
4.6 Uni-Directional with tricot stitch fabric (UD-t)
4.7 Double axial tricot stitch fabric 0°/90° (LT-t)
4.8 DB-c in Stitch Compression configuration (SC)
4.9 DB-c in Stitch Tension configuration (ST)
4.9.1 In-plane shear rigidity modulus
4.10 Summary
Appendix A:Fitting stress curves data Using Origin Pro?2017 Software:
5 Wrinkling Behavior Based on double-dome draping geometry
5.1 Introduction
5.2 WKNCFs parameters as reinforcements:
5.3 Forming behavior of the reinforcements
5.4 Drapeability and Double-dome Drapeability test(DDD)
5.5 Materials
5.6 Methods and Experimental setups
5.7 Results and discussion
5.7.1 Defect formation mechanics and code
5.7.2 Stitch mechanics(stitching pattern mechanics),asymmetrical behavior
5.7.3 Tricot stitch
5.8 Stitch tension
5.8.1 The possible locations of the defects
5.8.2 Quadriaxial WKNCF (QX-t)
5.8.3 Tri-axial WKNCF (DBL-t and DBT-c)
5.8.4 Bi-axial WKNCF (LT-t and DB-c)
5.8.5 Mono-axial WKNCF (UD-t)
5.9 summary and outlook
6 Conclusions and future work suggestions
6.1 New contributions
6.2 Recommendations and future work suggestions
7 References
8 List of Publications and achievements
Acknowledgements
本文编号：3913830
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