Research progress in testing methods of mechanical properties of textile composite fiber preforms
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摘要: 纺织复合材料具有质量轻、强度高,可设计性强等诸多优势,在航空航天领域得到广泛应用。纺织预制体的纤维结构对复合材料的最终力学性能有着决定性影响。然而,预制体的纤维结构在织造过程中不可避免地会发生宏观尺寸和微细观结构的变形,甚至产生褶皱缺陷。纺织预制体作为一种柔性骨架,其变形机制十分复杂。采用试验测试来表征预制体的力学变形特性是最直接、最有效的方法,也是建立理论和数值分析模型的基础。本文对纺织复合材料预制体的拉伸、压缩、弯曲、剪切和成型试验等测试方法进行了综述,讨论了不同测试方法的优缺点及适用条件,对后续的研究工作进行了展望。本研究将为预制体力学测试技术的改进、测试标准的建立和成型过程中的准确控形提供理论指导,对纺织复合材料的结构设计和工程应用起到推动作用。Abstract: Textile composites are widely used in aerospace field because of its advantages of light weight, high strength and strong designability.The fiber structure of textile preform determines the final mechanical properties of composites. However, the fiber structure of preform inevitably undergoes macro-scale and micro-structure deformation during the weaving process, and even wrinkle defects. The preform is a flexible skeleton, and its deformation mechanism is very complicated. Test is the most direct method to characterize the mechanical properties of preform, and it is also the basis of establishing theoretical and numerical analysis model. In this paper, the basic test methods of textile composite preform, such as tensile test, compression test, bending test, shear test and forming test, are reviewed. The advantages, disadvantages and applicable conditions of different test methods are discussed, and the future research work is prospected. The work in this paper will provide theoretical guidance for the improvement of preform mechanics testing technology, the establishment of testing standards and the accurate control of shape during the forming process. It will promote the structural design and engineering application of textile composites.
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Key words:
- textile composites /
- preform /
- mechanical properties /
- test method /
- deformation mechanism
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图 6 相框剪切和单向偏轴拉伸变形示意图[61]
Figure 6. Schematic representation of picture frame and uniaxial bias extension deformation[61]
Fframe—Measured force; Lframe—Length of the frame; γ12/2—Half shear angle; θ—Frame angle; Fshear—Shear force; Lfabric—Sample’s clamping length; uframe—Measured displacement; H—Effective length of specimen; L0—Initial diagonal length of zone A; d—Tensile displacement; Fbias—Tensile load; α—Half frame angle
表 1 双轴拉伸测试的试验参数
Table 1. Experimental parameters of biaxial tensile test
Material Sample center size/mm Sample arm size/mm Strain measurement method Loading method Ref. Coated woven fabrics 700×700 260×100 135 mm linear displacement transducers Biaxial bidirectional loading [16] Coated woven fabrics 300×300 150×25 100 mm linear displacement transducers Biaxial unidirectionalloading [16] Non-crimp 3D orthogonal woven reinforcement 60×60 145×60 Digital image correlation (DIC) Biaxial bidirectional loading [18] URETEK3216LV 160×160 200×160 28 mm needle extensometers Biaxial unidirectional loading [14] Envelope material 50×50 200×50 High-precision displacement sensors Plane loading of vertical specimen [19] HAA envelope 100×100 220×100 High-speed photography Biaxial bidirectional loading [12] Uretek5876 160×160 160×200 20 mm needle extensometers Biaxial bidirectional loading [15] Note: HAA—High altitude airship. 表 2 压缩测试的试验参数
Table 2. Experimental parameters of compression test
Material Top plate Sample
size/mmSpeed/
(mm·min-1)Strain measurement
methodRef. Spacer fabric Not mentioned 100×100 12 Micro-CT [30] Hexcel G986 twill 2/2 carbon fabric Diameter: 100 mm — 0.5 Micro-CT [23] Interlock fabric Not mentioned 100×100 1 Digital microscope VHX-1000 [21] 2/2 twill weave fabric Not mentioned 100×100 0.5 Micro-CT [31] Single layer fabric Surface areas: 15 cm2 50×50 1 Micro-CT [22] Woven and knitted fabrics Diameter: 100 mm 140×140 1 High resolution microscope [24] Carbon fibre plain weave Diameter: 50 mm 60×60 1 Imetrum video gauge system and Micro-CT [32] 表 3 弯曲测试的试验参数
Table 3. Experimental parameters of bending test
Material Test method Sample size/mm Speed Temperature/℃ Ref. Four structural carbon fiber fabrics Cantilever test 300×300 Quasi-static No [37] Monoply and multiply stitched fabric Cantilever test 300×150 Quasi-static No [40] Monoply/multiply and 3D carbon fiber fabric Cantilever test Monoply: 150/180×50
Multiply: 100×50
3D: 405×70×15Quasi-static No [41] PPS-carbon satin prepregs Cantilever test 200×50 Quasi-static 320, 345, 360, 380 [46] UHMWPE fiber reinforced TPU “Vertical”
cantilever test250×20 Quasi-static 80, 100, 120 [47] 5HS satin weave impregnated with Cycom 5320 “Vertical”
cantilever test150×50 3, 6, 9 mm/s 20, 50, 70, 90 [44] Unidirectional carbon
fiber reinforced PA6Cantilever/
three-point test23×15,53×15
Span: 20/500.01, 0.1, 0.5
mm/min200, 230, 260 [48] Interlock reinforcement Three-point test 200×30×15
Span: 116— No [49] Glass fiber twill/UD prepreg Rheometer test 15×20 0.1, 1, 10 r/min 60, 150, 210, 220, 260 [50] Unidirectional carbon
fiber reinforced Nylon 6Rheometer test (25-35)×25 0.6, 6, 19.2, 60 °/s 240, 26, 280 [51] Carbon fiber plain weave
fabric and Silicone oilsRheometer test 60×70 0.1, 1, 10 r/min No [52] Notes: PPS—Polyphenylene sulfite; TPU—Thermoplastic polyurethane; UHMWPE—Ultrahigh molecular weight polyethylene; UD—Unidirectional. 表 4 相框剪切测试的试验参数
Table 4. Experimental parameters of picture frame test
Material Sample size/mm Speed/(mm·min−1) Strain measurement method Ref. 3D angle interlock fabric 100×100 10 Manual image analysis [58] Non-crimp 3D orthogonal weave preform 180×180 10 Digital image correlation (DIC) [18] Plain-woven Kevlar@ 49 75×75
100×100
125×1255 CCD camera [67] NCFs with chain and tricot-chain stitches 210×210 20 1230-pixel camera [65] Twintex fabric 219×219 — Zeiss V20 stereo microscope [62] UD-NCF and Hexcel’s woven fabric 170×170 100 Two video cameras [61] F-12 aramid fabric 127×127 — DIC [66] Note: NCFs—Non-crimp fabrics. 表 5 偏轴拉伸测试的试验参数
Table 5. Experimental parameters of bias extension test
Material Test method Sample size/mm Speed/(mm·min−1) Strain measurement method Ref. 4-harness satin weave fabric and epoxy resin Bias extension test 225×90 20 DIC [78] Nylon 66 woven engineering fabric Bias extension test 200×100 10 CCD camera [56] Non-crimp 3D orthogonal weave preform Bias extension test 200×100 3 Digital camera [18] F-12 aramid fabric Bias extension test 300×50 — DIC [66] 2×2 twill-weave carbon fabric Bias extension test 200×100
300×150
400×200200 Casio HS EX-ZR700 digital camera [77] NCFs with chain and tricot-chain stitches Bias extension test 225×90 20 1230-pixel camera [65] Roving glass fibre/
polypropylene (PP)Bias extension test 250×100 100,1000 and 10000 PHANTOM V711 high-speed camera [80] UD-NCF Bias extension test 320×160 100 Digital video camera [61] Plain weave fabric Bias extension test 100×50 10 DIC [56] Plain weave glass fabric Biaxial bias extension test 210×210
240×240200 Digital camera (Canon power shot A 700) [73] Twintex Multi-step biaxial bias
extension (MBBE) test70×70 4 Creaform viuscan portable 3D scanner [74] 12 K carbon plain
weave woven fabricInfiltrated bias-extension
test (IBET)280×120 100, 350, 700 A camera system [79] 表 6 半球成型测试的试验参数
Table 6. Experimental parameters of hemispherical forming test
Material Punch/Circular
hole size/mmSample
size/mmSpeed/
(mm·min−1)Strain measurement
methodBlank-holder
pressureRef. 3D warp interlock preforms 150/160 300×300 — “tracers” yarns 0.2 MPa [85] Non-crimp carbon fabrics 150/287 Diameter 380 90 “shape-from-focus” (SFF) 9.4 kg [87] Bi-axial carbon fibre NCF 100/104 300×300 100 Grid strain analysis (GSA) 1200 N [90] Stitched UD-NCF 100/120 350×350 100 Optical strain analysis 750 g [61] Twill 2/2 woven fabric 100/122 260×260 2700 CCD camera 0.025, 0.075 MPa [88] 3D warp interlock/2D plain weave fabrics 150/150 250×250 45 Digital camera 0.2 MPa [13] Plain-weave fabric 150/160 400×400 30 Optical strain analysis 0.05 MPa [92] Triaxial fabrics 150/160 300×300 45 Video camera — [5] Note: CCD—Charge coupled device. 表 7 复杂结构成型测试的试验参数
Table 7. Experimental parameters of special-shaped forming test
Material Forming
experimentSample
size/mmSpeed/
(mm·min−1)Strain measurement
methodBlank-holder
pressureRef. Glass/polypropylene
plain weave fabricDouble dome benchmark 470×270 200 Manual image analysis 100 N [63] Plain woven composite
fabricDouble dome benchmark 470×270 20 Manual image analysis 100 N [93] Glass-polypropylene (PP) Double dome benchmark 452×640 100 Manual image analysis No [94] G1151@ interlock fabric Tetrahedral shape — — Optical module 480 N [95] G1151@ interlock fabric Prismatic shape — 30 Digital Image
Correlation (DIC)9.22 N/yarn [96] -
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