Geometric modeling method for 2.5-dimensional woven composite yarn
A composite material and geometric modeling technology, which is applied in the field of geometric modeling of 2.5-dimensional braided composite yarns, can solve problems such as the influence of the accuracy of yarn mechanical properties, insufficient research, large surface yarns, etc., and reach the limit range of influence wide range, improved precision and accuracy, and great universal applicability
Pending Publication Date: 2022-03-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
However, for textile composites, researchers made the following assumptions about the cross-section of composite yarns: racetrack, lenticular, rectangular, hexagonal, octagonal, etc. Simply regarded as a single function type, the relevant research is very insufficient, which will undoubtedly affect the accuracy of the mechanical properties of the yarn
At the same time, according to the detection of the interior of textile composite materials by non-destructive testing technology, the surface yarn is most affected by the processing technology. Processes such as die extrusion, tool cutting and machine modeling have seriously changed the geometric characteristics of the surface yarn. It shows that the structural laws of textile composites cannot be characterized by only a single hypothesis or a single function
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Embodiment
[0042] 1. Establish the weft projection diagram of three warp-lined twill weave 2.5-dimensional woven composite materials that are squeezed by weft:
[0043] (1) Use non-destructive testing technology such as X-CT to scan three 2.5-dimensional woven composite material test pieces with warp-lined twill to obtain their internal structural features; use AutoCAD2018 software to measure the size of each component on the CT image, as shown in figure 1 (a), figure 1 (b) and figure 2 . The boundary dimensions of the measurement unit cell are: 6.045mm in warp length, 7.8mm in weft direction, and 4.5906mm in height.
[0044] (2) On the AutoCAD2018 software, the weft projection diagram of the composite material considering weft extrusion is established, such as image 3 .
[0045] 2. Establish a three-dimensional frame diagram of three warp-lined twill weave 2.5-dimensional woven composite materials that are squeezed by weft:
[0046] (1) Save the above projected drawing as a file ...
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Abstract
The invention discloses a geometric modeling method for 2.5-dimensional woven composite material yarns, which comprises the following steps of: 1) establishing a weft projection drawing of a 2.5-dimensional woven composite material with extruded wefts; 2) according to the latitudinal projection drawing, establishing a three-dimensional frame drawing of the 2.5-dimensional woven composite material with extruded weft yarns; 3) establishing a standard model of the 2.5-dimensional woven composite material according to the three-dimensional frame diagram; 4) digging an original geometric block at a target position of the standard model, additionally establishing a weft geometric block considering extrusion, and carrying out replacement assembly to obtain a new model entirety; and (5) carrying out structural coupling on the whole new model to form a complete whole with closely connected units. The method is favorable for further standardizing the finite element analysis process and improving the finite element analysis precision and accuracy, is wide in factor influence limitation range, and has relatively high universality.
Description
technical field [0001] The invention relates to the field of geometric modeling of composite materials, in particular to a geometric modeling method for 2.5-dimensional braided composite yarns. Background technique [0002] Since the 1960s, composite materials have been developed rapidly and are widely used in aerospace, shipping and medical fields. For the research on the performance of composite materials, many scholars adopt the method of finite element analysis, that is, through the analysis process of building models, dividing grids, setting parameters, software solutions and experimental verification to obtain various properties of composite materials. In this process, the structural analysis before establishing the geometric model is the most important thing. Whether it is parametric modeling or visual solid modeling using modeling software, it is necessary to take into account the characteristics of the internal structure of the geometric model to avoid Important in...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 赵弘超崔海涛张宏建温卫东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS