scholarly journals Stretch Forming Analysis of Knitted Fabric Composites

1999 ◽  
Vol 8 (3) ◽  
pp. 096369359900800 ◽  
Author(s):  
T.C. Lim ◽  
S. Ramakrishna ◽  
H.M. Shang
Keyword(s):  
Strain Distribution ◽  
Knitted Fabric ◽  
Stretch Forming ◽  
Composite Sheet ◽  
Fabric Composite ◽  
Polymer Sheets ◽  
Fabric Composites ◽  
Forming Analysis ◽  
Distributed Strain ◽  
Good Agreement

Recently the effects of knitted fabric reinforcement on the sheet forming of polymer sheets have been investigated, and shown to provide strength and a more distributed strain. A new method for predicting the strain distribution of a stretch formed knitted fabric composite sheet is proposed in this paper. A good agreement was observed between the predicted and the experimental results.

scholarly journals Effect of Fibre Bundle Structure on Stretch Forming Properties of Plain Weft-Knitted Fabric Composites

1999 ◽  
Vol 8 (4) ◽  
pp. 096369359900800
Author(s):  
T.C. Lim ◽  
S. Ramakrishna ◽  
H.M. Shang
Keyword(s):  
Fibre Bundle ◽  
Knitted Fabric ◽  
Shells Of Revolution ◽  
Stretch Forming ◽  
Composite Sheet ◽  
Knitted Fabrics ◽  
Weft Knitted Fabric ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Bundle Structure

Knitted fabrics are known for their excellent stretchability and their flat composites have recently been shown to be easily stretch-formed into thin shells of revolution. In this paper, the stretch-forming properties are being investigated with due attention given to the fibre bundle loop structure. The capability of a plain weft-knitted fabric composite sheet to be stretch-formed is elucidated with reference to the fibre bundle structure.

scholarly journals Deep Drawing of Plain Weft-Knitted Fabric Composites Part 2.: Strain Field Analysis

2000 ◽  
Vol 9 (1) ◽  
pp. 096369350000900 ◽  
Author(s):  
T.C. Lim ◽  
S. Ramakrishna ◽  
H.M. Shang
Keyword(s):  
Deep Drawing ◽  
Strain Field ◽  
Textile Composites ◽  
Field Analysis ◽  
Knitted Fabric ◽  
Stretch Forming ◽  
Forming Process ◽  
Weft Knitted Fabric ◽  
Fabric Composites ◽  
Forming Analysis

Previous modelling techniques in sheet forming of textile composites have focused on computational simulations due to the numerous computations involved. Recently a procedure for stretch forming analysis of plain weft-knitted fabric composites has been developed. The analytical model for the stretch forming process is now being extended for the deep drawing process in this paper. The theoretical strain field gives good approximation to the experimental results.

scholarly journals Deep Drawing of Plain Weft-Knitted Fabric Composites: Part 1.: Cup Height Analysis

1999 ◽  
Vol 8 (6) ◽  
pp. 096369359900800 ◽  
Author(s):  
T.C. Lim ◽  
S. Ramakrishna ◽  
H.M. Shang
Keyword(s):  
Deep Drawing ◽  
Shell Height ◽  
Knitted Fabric ◽  
Fabric Structure ◽  
Weft Knitted Fabric ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Good Agreement

Previous investigations on forming of plain weft-knitted fabric composite sheets show the ease of stretching due to fabric loop straightening. Pure dependence on stretching alone, however, sets the limit to which the shell height can be further increased. Recent deep drawn knitted fabric composites give greater cup height in comparison to stretch formed cup. In this paper a method of predicting the achievable cup height is proposed with due consideration to the fabric structure and tool dimensions. Comparison between the theoretical and experimental cup height shows good agreement.

scholarly journals Knitted Fabric Composite Sheet Forming Simulation considering Fabric Realignment

1999 ◽  
Vol 8 (2) ◽  
pp. 096369359900800 ◽  
Author(s):  
T.C. Lim ◽  
M. Fujihara ◽  
M. Zako ◽  
S. Ramakrishna ◽  
H.M. Shang
Keyword(s):  
Sheet Forming ◽  
Constitutive Relationship ◽  
Knitted Fabric ◽  
Composite Sheet ◽  
Reinforced Polymers ◽  
Forming Simulation ◽  
Fabric Structure ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Relationship Of

In recent years, sheet forming of textile reinforced polymers have shown promising future applications. It is understood that the reorientation of fabric structure at the microscopic level alters the macroscopic constitutive relationship of the composite. In this paper, a new sheet forming simulation technique is proposed and being applied to knitted fabric composites.

scholarly journals SIMULTANEOUS DEEP DRAWING AND STRETCH FORMING OF KNITTED FABRIC COMPOSITE SHEET

1999 ◽  
Vol 48 (3Appendix) ◽  
pp. 57-61
Author(s):  
Teik Cheng LIM ◽  
Seeram RAMAKRISHNA ◽  
Huai Min SHANG
Keyword(s):  
Deep Drawing ◽  
Knitted Fabric ◽  
Stretch Forming ◽  
Composite Sheet ◽  
Fabric Composite

Effect of textile geometry on axisymmetric stretch forming of knitted fabric composites

2000 ◽  
Vol 214 (4) ◽  
pp. 333-337 ◽  
Author(s):  
T C Lim ◽  
S Ramakrishna ◽  
H M Shang
Keyword(s):  
Reasonable Agreement ◽  
Convex Surface ◽  
Shell Height ◽  
Sheet Forming ◽  
Knitted Fabric ◽  
Stretch Forming ◽  
Knitted Fabrics ◽  
Excellent Quality ◽  
Tool Profile ◽  
Fabric Composites

Plain weft-knitted fabrics are known for their excellent quality to stretch and drape around a convex surface without wrinkling. In recent years, sheet forming of knitted fabric composites has been investigated in view of promising future applications. In this paper a prediction of attainable shell height is proposed with reference to the textile geometry and the tool profile. Comparison between the measured and predicted shell heights shows reasonable agreement. The present analysis should provide a guideline for manufacturers in selecting the appropriate textile geometry for satisfactory stretch forming operations of knitted fabric composites.

Predictions of Elastic Properties of Multi-Axial Warp Knitted Fabric Composites

2004 ◽  
Vol 261-263 ◽  
pp. 1499-1504 ◽  
Author(s):  
Heoung Jae Chun ◽  
K.S. Ryu ◽  
Joon Hyung Byun
Keyword(s):  
Elastic Properties ◽  
Averaging Method ◽  
Three Dimensional ◽  
Design Parameters ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Out Of Plane ◽  
Experimental Values ◽  
Warp Knitted Fabric ◽  
Good Agreement

An analytical model was proposed to predict the elastic properties of multi-axial warp knitted (MWK) fabric composites for three-dimensional structures. The characteristics of MWK fabric composites are the assemblage of multilayers of rovings in the warp, weft and bias directions for in-plane reinforcement and out-of-plane stitches by knitting rovings to provide through-the- thickness reinforcement. For analysis, a representative volume of the MWK fabric composite was identified. The geometric limitations, effects of stitch fibers and design parameters of MWK composites are considered in the model. Then, the elastic properties of MWK fabric composites are predicted by using an averaging method. The experiments are also conducted on the MWK fabric composites to compare the predicted results with the experimental results for the verification of suggested model. The predicted elastic properties are in reasonably good agreement with the experimental values. Finally the effects of design parameters of the MWK fabric composites are discussed.

scholarly journals Effect of Fabric Pre-stretching on the Tensile Properties of Knitted Fabric Composites

1998 ◽  
Vol 7 (3) ◽  
pp. 096369359800700 ◽  
Author(s):  
S. Ramakrishna
Keyword(s):  
Tensile Properties ◽  
Knitted Fabric ◽  
Composite Fabrication ◽  
Specific Direction ◽  
Fabric Composite ◽  
Fabric Composites

This paper illustrates the influence of fabric pre-stretching on the tensile properties of knitted fabric composites. Prior to the composite fabrication, the fabric was stretched bi-axially in wale and course directions by different amounts. It has been shown that tensile properties of the composite in a specific direction can be improved by selectively pre-stretching the fabric more in that direction. It is also found that the equi-biaxially pre-stretched fabric composite displays marginally higher tensile properties compared to the composite reinforced with 0% pre-stretched fabric.

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