碳纤维增强树脂复合材料齿槽加工中分层缺陷的形成机制

苏飞; 欧阳晨恺; 李枫; 郑雷

doi:10.13801/j.cnki.fhclxb.20210526.004

碳纤维增强树脂复合材料齿槽加工中分层缺陷的形成机制

doi: 10.13801/j.cnki.fhclxb.20210526.004

苏飞^{1, 2, ,},
欧阳晨恺^{1, 2,},
李枫^{1, 2,},
郑雷³

1.
湖南科技大学　智能制造研究院，湘潭 411201
2.
湖南科技大学　智能制造研究院难加工材料高效精密加工湖南省重点实验室，湘潭 411201
3.
盐城工学院　机械工程学院，盐城 224051

基金项目: 国家自然科学基金(51805164)；难加工材料高效精密加工重点实验室开放基金(E21753)；国家自然科学基金(51575470)；江苏省自然科学基金面上项目(BK20201474)；湖南省教育厅资助科研项目(18A182)

详细信息

通讯作者:
苏飞，博士，副教授，硕士生导师，研究方向为先进制造工艺与装备　E-mail：sfeihe@163.com

中图分类号: TQ327；V258+.3
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出版历程
- 收稿日期: 2021-04-20
- 录用日期: 2021-05-19
- 网络出版日期: 2021-05-26
- 刊出日期: 2021-12-01

Formation mechanism of the slotting delamination of carbon fiber reinforced plastics

SU Fei^{1, 2
, ,},
OUYANG Chenkai^{1, 2
,},
LI Feng^{1, 2
,},
ZHENG Lei³

1.
Intelligent Manufacturing Institute, Hunan University of Science and Technology, Xiangtan 411201, China
2.
Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material, Hunan University of Science and Technology, Xiangtan 411201, China
3.
School of Mechanical Engineering, Yancheng Institute of Technology, Yancheng 224051, China

摘要

摘要: 针对碳纤维增强树脂复合材料(Carbon fiber-reinforced plastic，CFRP)齿槽加工中易产生分层缺陷的问题，尤其以切出侧最严重。根据齿槽加工中分层缺陷的形成过程，重点构建CFRP齿槽加工切出侧最表层材料分层形成的临界切削力模型，并以平纹编织CFRP为研究对象，采用T型铣刀进行试验，从力学角度揭示齿槽加工中分层缺陷的形成机制。结果表明：齿槽上下两侧的经向纤维分层缺陷较小；A情形(有支撑)、B情形(无支撑)下纬向纤维分层缺陷产生的临界切削力均较小，因此，齿槽加工中分层缺陷均易产生，尤其是B情形；A、B两种情形下单束纤维临界力均在边缘附近呈较大值，中间部位临界力变化较小及纤维的变形均以中间部分较大，边缘部位变形小，由此导致A、B两种情形下的分层缺陷均以单束纤维为边界形成半月弧形“波峰”；随着每齿进给量f_z和切削速度V_c的增大，两种情形下的分层缺陷均呈增大趋势。试验结果与临界力理论推导结果基本一致。
- CFRP /
- 齿槽加工 /
- 分层缺陷 /
- 形成机制 /
- 临界切削力
Abstract: In view of the problem that the delamination was easily occurred during the carbon fiber-reinforced plastic (CFRP) slotting, especially the exit side was the most serious, according to the formation process of the slotting delamination, the onset critical force models of the exit outermost layer delamination for CFRP slotting were emphatically established. The slotting tests, using the T-slot cutter, were carried out on the plain weave CFRP. Then, the formation mechanisms of the delamination were revealed from the view mechanics. The results show that the delaminations of the warp fibers on both up and down sides are small. The onset critical forces of the case A (supported) and case B (unsupported) for the fill fibers are small, then, the delaminations of these two cases easily occur, especially the case B. The critical forces of these two cases are large near the edge of a single fiber bundle, and their changes are small in the central of a single fiber bundle. Additionally, the deformations of these two cases are all large in the center of a single fiber bundle and are small near the edge of a single fiber bundle. As a result, in the boundary of a single bundle of fibers, the delaminations of the case A or case B are all shaped as a half-moon arc “wave peak”. The delaminations of these two cases increase with the increasing feed per tooth f_z and the cutting speed V_c. The experimental results are in good agreement with the theoretical derivation results of the critical forces.
- CFRP /
- slotting /
- delamination /
- formation mechanism /
- critical cutting force

HTML全文

图 1 齿槽加工分层缺陷的形成过程及类型

Figure 1. Forming process and types of slotting delamination

q—Uniformly distributed load; r_e—Tool radius; f_z—Feed per tooth; V_c—Cutting speed

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图 2 碳纤维增强树脂复合材料(CFRP)齿槽加工有支撑型(A情形)分层缺陷理论模型

Figure 2. Theoretical model of the slotting delamination for supported of carbon fiber-reinforced plastic (CFRP) (Case A)

a—Fiber bundle width; b—Width of a single cutting

下载: 全尺寸图片幻灯片

图 3 CFRP无支撑型(B情形)分层缺陷理论模型

Figure 3. Theoretical model of delamination for unsupported of CFRP (Case B)

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图 4 CFRP平纹编织结构及试验装置

Figure 4. CFRP plain woven structure and experimental setups

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图 5 CFRP齿槽加工典型切削力曲线

Figure 5. Typical cutting force curves of CFRP slotting

F_x—x direction cutting force, F_z—z direction cutting force

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图 6 CFRP齿槽分层缺陷的评价方法

Figure 6. Evaluation methods of slotting delamination of CFRP

L_Amax—Delamination factor of the zonal fiber in case A; L_Bmax—Delamination factor of the zonal fiber in case B

下载: 全尺寸图片幻灯片

图 7 CFRP最外层分层缺陷的形态

Figure 7. Delamination morphologies of surface layer of CFRP

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图 8 CFRP分层缺陷临界切削力的变化规律

Figure 8. Changes of the delamination onset critical forces of CFRP

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图 9 CFRP分层因子L_max的变化规律

Figure 9. Changes of delamination factors L_max of CFRP

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表 1 CFRP (T300/环氧树脂)特征参数^[21]

Table 1. Properties of CFRP (T300/epoxy)^[21]

Parameter Value

Poisson’s ratio ν 0.3
Equivalent Young’s modulus E_eq/GPa 230
I fracture toughness G_IC/(J·m⁻²) 260

下载: 导出CSV

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