# What is 3D weaving? Preforms woven in three axes

3D weaving combines warp, weft and through-thickness binder yarns on one loom to make a preform whose layers are locked together. Method, types and limits.

- Web page: https://3dwovens.com/en/knowledge/what-is-3d-weaving
- Last updated: 2026-09-24

Author: 3Dwovens Engineering Team

> **Short answer:** 3D weaving is a textile process that interlaces yarns in three perpendicular directions at once: warp (X), weft (Y) and binder yarns running through the thickness (Z). The result is a thick fibre preform made in one operation rather than by stacking separate fabric plies. Once infused with resin, it becomes a composite whose layers are tied together by fibre.

> **Figure: Cross-section of a 2D laminate compared with a 3D orthogonal weave.** Schematic section along the warp direction. In a laminate only resin holds the plies together; in a 3D weave the binder yarns run through the thickness and lock the layers to each other. Not to scale.

## How 3D weaving differs from 2D weaving

In conventional woven fabrics (plain, twill, satin), warp and weft yarns pass over and under each other in a single plane. Such a fabric is usually a fraction of a millimetre thick. To make a thick composite part, plies cut from these fabrics are stacked, joined with resin and cured. The result is called a laminate.

In a laminate, the fibres run only in the plane of each ply. The only thing holding the plies together through the thickness is the thin layer of resin between them. Because resin is far weaker and less tough than fibre, a laminate is strong under in-plane loads but weak under through-thickness tension and interlaminar shear. Plies separating from each other, known as [delamination](https://3dwovens.com/en/knowledge/what-is-delamination.md), is the best-known consequence of that weakness.

In 3D weaving, the thickness is created by the weaving process itself. The loom feeds many layers of warp yarn at the same time; weft yarns are inserted between these layers and binder yarns travel through the thickness to tie the layers together. There are no independent plies in the structure: the preform is a single piece from the moment it is woven.

## Three axes: warp, weft and binder

- **Warp (X):** yarns that run lengthwise through the loom, in the direction the fabric is produced. A 3D weave contains several warp layers stacked on top of each other.
- **Weft (Y):** yarns inserted between the layers at right angles to the warp. Each insertion can place weft yarns at several heights.
- **Binder (Z):** yarns fed in the warp direction that move up and down through the thickness. They lock the layers together mechanically and provide the resistance to delamination.

The axis names follow the usual coordinate convention in composites engineering: X and Y are the in-plane directions and Z is the thickness direction. Binder yarns are usually a small share of the total fibre; in-plane loads are still carried mostly by the warp and weft. More binder means a stronger through-thickness connection but less fibre left for the in-plane directions. Striking that balance is one of the central decisions in designing a weave pattern.

## How 3D weaving works

A 3D loom keeps the basic operations of conventional weaving but applies them to a multi-layer warp. One weaving cycle consists of these steps, in order:

1. **Shedding:** warp and binder yarns are lifted to different heights according to the weave pattern, opening several gaps (sheds) between the layers.
2. **Picking:** weft yarns are passed through the open sheds.
3. **Beat-up:** the reed pushes the new weft yarns against the fell of the fabric.
4. **Binder movement:** binder yarns are carried to the top or bottom face according to the pattern, wrapping the weft columns through the thickness.

The weave pattern is a table that defines at which height each yarn sits for each weft insertion, and it is often executed by computer-controlled shedding systems. The pattern can change during weaving to follow the cross-section of the part. This lets the loom produce not only flat plate but also preforms that vary in thickness or curve. T, Π and H profile preforms are woven closed (folded flat) on the loom and opened out into the section after they come off the loom.

Weaving brittle, abrasion-sensitive yarns such as carbon fibre in many layers requires careful control of yarn tension and friction. The literature notes that yarn damage and crimp introduced during weaving can affect the in-plane properties of the composite (Mouritz and Cox, 2010). Loom design and weaving parameters therefore have a direct effect on the quality of a 3D woven product.

## 3D weave architectures

The path the binder yarns take through the thickness defines the architecture of a 3D weave. Three main types appear in the literature (Tong, Mouritz and Bannister, 2002).

### Orthogonal weave

Binder yarns cross the full thickness vertically; warp and weft yarns stay largely straight. Straight yarns contribute to in-plane stiffness, while the binders connect the top and bottom faces directly. The section in the diagram above shows this architecture.

### Layer-to-layer angle interlock

Binder yarns do not cross the full thickness; each one ties adjacent layers together at an angle. The layers interlock like links in a chain. This structure usually conforms to a mould more easily, and the thickness can be increased by adding layers.

### Through-thickness angle interlock

Binder yarns cross the whole thickness at an angle. This architecture sits between the others in the balance between through-thickness connection and in-plane properties.

The architecture is chosen by weighing the load case, the thickness, the need to conform to a mould and the production rate together. Different patterns can also be used in different regions of the same part.

## Hybrid 3D weaving

Because warp, weft and binder yarns are fed to the loom separately, each axis of a 3D weave can use a different fibre. Carbon can provide stiffness in the direction that carries the load, while aramid can be used in the binder yarns or on an impact-exposed face, and glass where cost or electrical insulation comes first. The different fibres are locked together by the binder yarns within a single preform; unlike a hybrid laminate built from stacked plies of different materials, the transitions between materials stay bound through the thickness as well. Hybrid 3D woven structures are widely studied in the literature. Since the fibres differ in stiffness and strain to failure, the choice of fibres and weave pattern is assessed together with the part's load case and service conditions.

## From preform to composite

What comes off a 3D loom is a dry fibre preform with no resin in it yet. To become a composite part, the preform is placed in a mould and resin is driven into it under pressure or vacuum. The most common processes for this are resin transfer moulding (RTM), vacuum-assisted resin transfer moulding (VARTM) and vacuum infusion. After the resin cures, the part is demoulded and, where needed, machined on a CNC.

A one-piece dry preform also helps in production: dozens of plies do not have to be cut and laid one by one, and errors such as plies shifting or being laid at the wrong angle cannot occur. On the other hand, fully wetting out a thick, tightly woven preform takes careful process design. If the resin flow is insufficient, dry spots and voids (porosity) can form.

## Advantages and limits

The literature summarises the main characteristics of 3D woven composites as follows (Mouritz et al., 1999; Tong et al., 2002):

- Interlaminar fracture toughness and delamination resistance are markedly higher than in equivalent 2D laminates.
- Impact damage stays within a smaller area, and compression-after-impact (CAI) strength is higher.
- Joint regions such as T, Π and H sections can be woven in one piece, reducing the number of bond lines and fasteners.
- Because the preform comes out as one piece, ply lay-up labour disappears.

The same sources are just as clear about the limits:

- Crimp from the binder yarns and yarn damage during weaving can lower in-plane stiffness and strength below those of an equivalent laminate in some structures. How large the effect is depends on the architecture, the binder content and manufacturing quality (Mouritz and Cox, 2010).
- Resin-rich regions can form around binder yarns, and damage can start there (Cox et al., 1994).
- Loom and pattern design take specialist know-how, and supply options are narrower than for standard fabrics.

3D weaving is therefore not the right choice for every application. The largest gains come in parts whose design is governed by delamination, impact damage or separation at a joint.

## Comparison: 2D laminate and 3D woven composite

| Property | 2D laminate (fabric or UD plies) | 3D woven composite |
|---|---|---|
| Through-thickness fibre | None; resin holds the plies together | Yes; binder yarns lock the layers |
| Delamination resistance | Limited by resin toughness | Markedly higher |
| Impact damage | Can spread over a large area between plies | Stays within a smaller area |
| In-plane properties | Can be optimised by the ply stack | Depend on architecture; crimp can reduce them |
| Joint regions (T, Π) | Separate parts bonded or fastened | Can be woven in one piece |
| Preform preparation | Plies cut and laid one by one | Preform comes out in one piece |
| Mould conformability | Thin fabrics conform easily | Depends on architecture; angle interlock conforms more easily |

## Where 3D woven composites are used

3D woven composites are used or under investigation in aerospace joints and connection parts, impact-exposed components such as the fan blades of commercial aircraft engines, space structures, defence and ballistic protection, marine structures and unmanned aircraft. What these applications share is that the part is exposed to interlaminar damage from impact, vibration or stresses at a joint. The 1999 review by Mouritz and co-authors covers early examples of these applications and the properties for which 3D weaving was chosen.

## In practice

3Dwovens has carried out R&D on 3D weaving since 2011, and its looms are designed and built in-house. The [OWC 3D woven carbon plate](https://3dwovens.com/en/products/owc-plate.md) is made by turning a preform woven this way into a composite with epoxy resin. The plate measures 500 × 250 × 6.5 mm, has a density of about 1.55 g/cm³ and a resin glass transition temperature (Tg) of 140 °C.

Test results show 3D woven RTM specimens reaching 813–993 MPa tensile strength and 94–107 GPa flexural modulus. In the same tests, unidirectional (UD) prepreg specimens reached 718–819 MPa and 82–91 GPa, and plain-weave prepreg specimens 420–454 MPa and 39–41 GPa. These values apply to specific specimens and test conditions; verify them under your own loading conditions before using them as design values. For T, Π, H or box profiles woven to a drawing, a quote can be requested on the [custom production](https://3dwovens.com/en/custom.md) page.

## Frequently asked questions

### Is 3D weaving the same as 3D printing?

No. 3D weaving is a textile process that interlaces yarns in three directions on a loom and produces a continuous-fibre preform. 3D printing is additive manufacturing that builds material up layer by layer; continuous fibre reinforcement is possible only with specialised systems and to a limited extent.

### Is a 3D woven composite always stronger than a laminate?

No. Through-thickness yarns markedly raise delamination resistance and strength after impact. In-plane stiffness and strength depend on the weave architecture, the binder content and manufacturing quality. The choice follows the failure mode that governs the design of the part.

### Which fibres can be 3D woven?

Carbon, glass and aramid fibres and their hybrids can be woven. The fibre is chosen for stiffness, impact resistance, electrical properties and cost.

### How is a dry preform turned into a composite?

The preform is placed in a mould and resin is driven into it by resin transfer moulding (RTM), vacuum-assisted resin transfer moulding (VARTM) or a similar process. Once the resin cures, the part takes its final form.

## References

- Mouritz, A. P., Bannister, M. K., Falzon, P. J., Leong, K. H. (1999). Review of applications for advanced three-dimensional fibre textile composites. *Composites Part A: Applied Science and Manufacturing*, 30(12), 1445–1461.
- Tong, L., Mouritz, A. P., Bannister, M. K. (2002). *3D Fibre Reinforced Polymer Composites*. Elsevier.
- Mouritz, A. P., Cox, B. N. (2010). A mechanistic interpretation of the comparative in-plane mechanical properties of 3D woven, stitched and pinned composites. *Composites Part A: Applied Science and Manufacturing*, 41(6), 709–728.
- Cox, B. N., Dadkhah, M. S., Morris, W. L., Flintoff, J. G. (1994). Failure mechanisms of 3D woven composites in tension, compression, and bending. *Acta Metallurgica et Materialia*, 42(12), 3967–3984.
- Chen, X. (ed.) (2015). *Advances in 3D Textiles*. Woodhead Publishing.
- ASTM D3039/D3039M. Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials. ASTM International.
- ASTM D7264/D7264M. Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials. ASTM International.