碳纤维3D机织预制体弯曲性能

郭珍珍; 谢军波; 焦伟; 朱琬清; 邵梦洁; 杨志; 陈利

doi:10.13801/j.cnki.fhclxb.20220811.003

碳纤维3D机织预制体弯曲性能

doi: 10.13801/j.cnki.fhclxb.20220811.003

郭珍珍^{1, 2,},
谢军波^{1, 2, ,},
焦伟^{1, 2},
朱琬清^{1, 2},
邵梦洁^{1, 2},
杨志^{1, 2},
陈利^{1, 2}

1.
天津工业大学　复合材料研究院纺织复合材料教育部重点试验室，天津 300387
2.
天津工业大学　纺织科学与工程学院，天津 300387

基金项目: 国家自然科学基金青年基金(11802204)；天津市教委科研计划项目(2018KJ195)

详细信息

通讯作者:
谢军波，博士，副研究员，硕士生导师，研究方向为复合材料力学、织物力学　E-mail: xiejunbo@tiangong.edu.cn

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2022-06-10
- 修回日期: 2022-07-11
- 录用日期: 2022-07-28
- 网络出版日期: 2022-08-12
- 刊出日期: 2023-06-15

Bending properties of carbon fiber 3D woven preforms

GUO Zhenzhen^{1, 2
,},
XIE Junbo^{1, 2
, ,},
JIAO Wei^{1, 2},
ZHU Wanqing^{1, 2},
SHAO Mengjie^{1, 2},
YANG Zhi^{1, 2},
CHEN Li^{1, 2}

1.
Ministry of Education Key Laboratory of Advanced Textile Composite Materials, Institute of Composite Materials, Tiangong University, Tianjin 300387, China
2.
School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China

Funds: National Natural Science Foundation of China (11802204); Science & Technology Development Fund of Tianjin Education Commission for Higher Education (2018KJ195)

摘要

摘要: 异形结构复合材料构件成型过程中，其内部纤维预制体往往发生显著的宏观变形。预制体的弯曲性能对褶皱缺陷的形成和演化有着决定性影响。采用三点弯曲法对碳纤维3D机织预制体进行了测试，利用Micro-CT技术研究了预制体的微细观变形机制，分析了经纱密度和纬纱密度对预制体弯曲性能的影响规律。结果发现：3D机织预制体的临界弯曲能量随着组织点密度的增加大致呈线性增大的趋势。预制体弯曲变形主要由经纱屈曲度变化、局部压缩屈曲和经纬纱层间滑移等微细观变形构成。
- 3D机织预制体 /
- 弯曲变形 /
- Micro-CT技术 /
- 微细观结构 /
- 变形机制
Abstract: During the forming process of composite components with complex-shaped geometries, the fiber preform would deform significantly in macro-scale. The bending performance of the preform has a decisive impact on the formation and evolution of wrinkle defects. The three-point bending method was employed to test the carbon fiber 3D woven preforms. Micro-scale deformation mechanisms of the preform were researched using the Micro-CT technology. Effects of structural parameters such as warp density and weft density on the bending property of the preforms were analyzed. It is shown that the critical bending energy of the preforms increases linearly with the increase of weaving point density. The macro-scale bending deformation of the preform is mainly composed of micro-scale deformations such as changing of warp yarn buckling degree, local compression buckling of warp yarns and slippage between warp and weft yarn layers.
- 3D woven preform /
- bending deformation /
- micro-CT technology /
- mesostructure /
- deformation mechanism

HTML全文

图 1 3D机织预制体示意图：(a) 3D机织结构；(b) 经纱路径

Figure 1. Schematic diagrams of 3D woven preform: (a) 3D woven structure; (b) Warp yarn path

下载: 全尺寸图片幻灯片

图 2 3D机织预制体Micro-CT扫描：((a)~(c)) 变形前；((d)~(f)) 变形后

Figure 2. Micro-CT test of the 3D woven preform: ((a)-(c)) Before deformation; ((d)-(f)) After deformation

下载: 全尺寸图片幻灯片

图 3 预制体三点弯曲测试：(a) 0 mm；(b) 2 mm；(c) 4 mm；(d) 6 mm；(e) 8 mm；(f) 10 mm

Figure 3. Three-point bending test of the preform: (a) 0 mm; (b) 2 mm; (c) 4 mm; (d) 6 mm; (e) 8 mm; (f) 10 mm

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图 4 3D机织预制体三点弯曲试样载荷-挠度曲线：((a)~(c)) 经纱密度5根/cm、8根/cm、10根/cm；((d)~(f)) 纬纱密度2.5根/cm、3.0根/cm、3.5根/cm

Figure 4. Load-deflection curves of three-point bending samples of 3D woven preform: ((a)-(c)) Warp densities of 5 ends/cm, 8 ends/cm and 10 ends/cm; ((d)-(f)) Weft densities of 2.5 picks/cm, 3.0 picks/cm and 3.5 picks/cm

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图 5 3D机织预制体三点弯曲试样临界弯曲能量

Figure 5. Critical bending energy of three-point bending sample of 3D woven preform

E_i—Bending energy under a certain bending deflection; F—Bending load; F_c—Critical bending load value; F_i—Bending load value under a certain bending deflection; d—Bending deflection; d_c—Critical bending deflection value; Δd—Unit bending deflection value

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图 6 组织点密度对3D机织预制体临界弯曲能量的影响

Figure 6. Effect of weaving point density on critical bending energy of 3D woven preform

E_c—Critical bending energy

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图 7 3D机织预制体经纱屈曲度的定义：(a) 变形前；(b) 变形后

Figure 7. Definition of buckling degree of warp yarn of 3D woven preform: (a) Before deformation; (b) After deformation

L_base—Baseline length

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图 8 3D机织预制体：(a) 变形前经纱路径；(b) 变形后经纱路径；(c) 变形前后经纱屈曲度对比

Figure 8. 3D woven preform: (a) Warp yarn path before deformation; (b) Warp yarn path after deformation; (c) Comparison between buckling degree of warp yarns before and after deformation

L—Layer

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图 9 3D机织预制体表面经纱的局部屈曲

Figure 9. Local buckling of the surface warp yarn of 3D woven preform

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图 10 3D机织预制体纬纱列偏转角：(a) 基于Micro-CT图像的测量；(b) 统计结果

Figure 10. Weft row deflection angle of 3D woven preform: (a) Measurement based on Micro-CT image; (b) Statistical result

C—Column

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表 1 3D机织预制体结构参数

Table 1. Structure parameters of 3D woven preforms

Sample	Number of warp layer	Number of weft layer	Apparent thickness/mm	Weaving point density/cm⁻²
J5W2.5	7	8	6.31	21.88
J5W3.0	6	7	5.89	22.50
J5W3.5	6	7	6.19	26.25
J8W2.5	5	6	6.78	25.00
J8W3.0	5	6	6.60	30.00
J8W3.5	4	5	5.97	28.00
J10W2.5	4	5	6.71	25.00
J10W3.0	4	5	7.00	30.00
J10W3.5	4	5	6.73	35.00

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