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经编多轴向织物的研究与应用


经编多轴向织物的研究与应用





东华大学

中国复合材料工业协会会议
2014年4月13-25日 常州

Outline
? Introduction ? Modeling M d li of f MWK ? Fabric performance ?

Composite molding ? Applications ? Acknowledge

Reinforcements

MultiMulti -axial Warp Knitted (MWK) Structures
? ? ? ? ? ? Up to 7 layers Lay up angle infinitely variable Customer tailored made Random mat below and on the layers Full utilization of the yarn strength Better interlayer mechanical property

0° +45° 90° -45° MAT
Glass Fiber Carbon Fiber Aramid Fiber

Hybrid

Outline
? Introduction ? Modeling M d li of f MWK ? Fabric performance ? Composite molding ? Applications ? Acknowledge

Geometric Modeling

Geometric Modeling g
Vf =

λi 2 L x + L y + 2 L2 x + Ly ρi

(

)

+

λs ? 2 Lx + 2( Lz + 3ds) + ? ρs

2 ? L2 x + Ly ?

Lx ? L y ? Lz

Pillar (±θ)

Tricot ( 0°/90°/±θ)

Structures and Properties p
Type Stitching Stit hi Structure Yarn Count 0° (tex) / 1200 90° (tex) / 600 +45° (tex) 300 600 -45° (tex) 300 600 Stitching yarn (dtex) 83 83

BX600 QX1200

1-0/0-1// 1-0/1-2//

T Type Fiber Volume Fraction of weft insertion yarns (%) Fiber Volume Fraction of stitching yarns (%) Calculated Fiber Volume Fraction (%) Experimental Fiber Volume Fraction (%)

BX600 48.20 0 85 0.85 49.05 46 56 46.56

QX1200 55.26 1 24 1.24 60.01 56 50 56.50

Outline
? Introduction ? Modeling M d li of f MWK ? Fabric performance ? Composite molding ? Applications ? Acknowledge

Stitch Density
Type BXM600/300-A BXM600/300-B BXM800/450-A BXM800/450-B QX1170-A QX1170-B BXM450/225-A BXM450/225-B Stitches/cm 2.85 4 72 4.72 2.85 4.13 2.85 4.72 2.85 4.72 Strength(kN/2.5cm) +45? 3.28 3 19 3.19 4.15 4.03 3.56 3.53 2.12 2.06 -45? 3.22 3 35 3.35 3.99 4.19 3.61 3.48 1.99 2.16

?Stitching Stit hi needles dl will ill damage d the th weft ft insertion i ti yarns ?Stitching density has influence on the strength of the fabric ?Under the reasonable stitching density, density the strength of the fabric NOT vary much ?Stitching movement has larger abrasion effect on the needle

Random Mat
Type BX1200 BXM1200/300 BXM600/225 BXM600/300 Weight of mat(g) Strength(kN/2.5cm) 45 -45? 45 +45? 0 300 225 300 5.06 5.14 3.28 3.46 4.91 5.23 3.34 3.42

?Introducing g the mat has SMALL effect on the strength g of the fabric ?Mat helps to stable the weft insertion yarn, particularly with +/-45 ?Improve the flow front of the resin infusion process ?Improve the energy absorption property

Compaction Behavior
3layer8h
60 55 50
58 57 56 55

BX600 BX1200

vf(%)

45 40 35

vf(%)

3 layers BX1200

54 53 52 51 50

900te (±45°) 900tex

300tex (±45°)
1.0 1.5 2.0 2.5 3.0

0

100

200

300

400

500

ti time (min) ( i )

numbe of layer

?Fiber volume fraction ( (FVF) ) NOT change g after 30 min compaction p ?FVF vary with number of layers ?FVF of 3 layers of BX600 SMALLER than that of 1 layer BX1200 ?Yarn count for weft insertion play important role on the FVF

Compaction Behavior
65 60 55
Vf(%)

50 45 40 35 30 0 1 2 3 4 5 6 7

TTX2400 QX3600 BX1800 LTM2408

8

9

number of layer

?FVF increases with more layers ?Yarn orientation play IMPORTANT role on the FVF based on same layers (2 layer QX3600 4 layer BX1800) ?Different lay-up angle effects the FVF

Spring Back Effect
65 64

63

vf f(%)

62

Ttx1200 3layer 4h Ttx1200 3layer 1h

61

60 10 1.0

08 0.8

06 0.6

04 0.4

02 0.2

00 0.0

bar

60 59 58 57

?Spring back effect NOT vary MUCH with compaction time
Bx1200 3layer 1h Bx1200 3layer 8h

vf(%)

56 55 54 53 52 1.0 0.8 0.6 0.4 0.2 0.0

?Spring back behavior NOT vary with the number of layer ?Starting point for spring back changes with the number of layer

bar

Ground Stitch

Fig. 4 Ground structures

Outline
? Introduction ? Modeling M d li of f MWK ? Fabric performance ? Composite molding ? Applications ? Acknowledge

Vacuum-assisted Resin Transfer Molding (VARTM) Vacuum-assisted Vacuum assisted Resin Infusion Molding (VARIM)
DM Vacuum Bag Inlet Peel Ply O tl t Outlet Breath Material Tacky Tape

Preforms

Tool

?Single and close mold processing ?Room temperature infusion and cure ?Good mechanical quality ?Good for large scale part ?Environment friendly ?Stable quality and high repeatability

Permeability Test
Darcy’s law:

u=?

K ΔP ? μ Δx

1D PERM

K xx =

2 μ ?φ ? x 2 ? ΔP ? t

? Porosity(%) ? ? ? ? Pressure(105 Pa) Vi Viscosity i (Pa?S) P S) Infusion Time (s) Size (mm)

Online Flow Behavior Monitoring

Flow behavior in thick laylay-up
30 layers

Kxx

Kzz

* Uni-axial 1250 g/m2

Outline
? Introduction ? Modeling M d li of f MWK ? Fabric performance ? Composite molding ? Applications ? Acknowledge

Application of MWK Non Crimp Fabric

874 874gsm 32 l layers 4 4.8cm 8

500gsm g 54 layers y 4.4cm

900gsm UD WOVEN 900gsm UD NON CRIMP


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经编织物 | 经编针织物 | 经编间隔织物 | 经编起绒织物 | 多轴向经编织物 | 经编针织物生产技术 | 拉歇尔经编针织物 | 圆筒织物经编机 |