Multiaxial Fabric Sewing Thread Fineness for Composite Stability
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Solution Overview
Problem
Multiaxial fabrics used in fiber composite components often exhibit unsatisfactory mechanical strength under pressure and impact loads, leading to the need for improved properties in such materials.
Innovation Solution
A multiaxial fabric design utilizing sewing threads with a fineness in the range of 10 to 30 dtex, specifically 15 to 25 dtex, and stitch length and width relationships that ensure a more even thread pattern, reducing fiber waviness and gap formation, thereby enhancing stability and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional sewing threads with higher fineness are used to connect multiaxial fabric layers, then the fabric structure is stabilized, but fiber waviness and gap formation increase, reducing mechanical strength under pressure and impact
Solution Approach 1:
The patent changes the fineness parameter of the sewing thread from conventional higher values to specifically 10-30 dtex. This parameter change allows the thread to be fine enough to minimize fiber displacement and gap formation, yet sufficiently strong to stabilize the fabric layers. The optimized fineness parameter resolves the contradiction by finding the optimal balance point where stabilization effectiveness is maintained while mechanical strength is improved.
2Strength
If sewing threads with optimized fineness are used, then fiber waviness is reduced and mechanical strength improves, but the thread pattern uniformity becomes more critical to maintain
Solution Approach 1:
The patent specifies precise preliminary parameters for stitch length (s) and stitch width (w) that must be established before manufacturing. These preliminary actions ensure that the thread pattern is uniformly distributed across the fabric, which is critical when using fine sewing threads. By pre-defining these geometric parameters, the manufacturing process maintains consistency and achieves the required thread pattern uniformity.
3Strength
If fine sewing threads are used to reduce fiber deflection, then compressive strength increases, but resin infiltration may be affected
Solution Approach 1:
The patent optimizes the geometric parameters of stitching (stitch length s and stitch width w) to create an optimal balance. The fine thread fineness (10-30 dtex) combined with optimized stitch geometry creates sufficient spacing and channel structure that allows resin to infiltrate effectively while maintaining reduced fiber deflection. This dual optimization of thread fineness and stitch geometry resolves the contradiction between compressive strength and resin infiltration reliability.
Data Source
Figure 1~2
AI summary
The invention relates to a multiaxial fabric consisting of at least two superimposed layers of multifilament reinforcing yarns arranged parallel to each other and adjacent to each other within the layers, wherein the reinforcing yarns within a layer and adjacent layers are connected and fixed to each other by sewing threads running parallel to each other and spaced apart from each other by a stitch width w, wherein the sewing threads form stitches with a stitch length s and the zero-degree direction of the fabric is defined by the sewing threads, wherein the reinforcing yarns of the layers are arranged symmetrically with respect to the zero-degree direction of the fabric and, with respect to their direction of extension, form an angle α to the zero-degree direction which is not equal to 90° and not equal to 0°, wherein a nonwoven fabric is arranged on and/or between the at least two layers.characterized in that the sewing threads have a density in the range of 10 to 35 dtex. The invention further relates to a preform made from such a multiaxial fabric.