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Damage determination method and system for curing molding of toughened composite material

A toughening composite material, curing molding technology, applied in the direction of material thermal development, force/torque/work measuring instrument, instrument, etc., can solve the problem of unpredictable material resin-pin interface area damage, difficult to grasp the curing damage evolution mechanism , the inability to accurately assess the service performance of materials, etc.

Active Publication Date: 2021-11-05
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] At present, the research work on the curing and molding of Z-pin toughened resin-based composites mainly focuses on the exploration of the mechanical properties of materials by means of experimental detection, but the quantitative simulation of the curing and molding process of Z-pin toughened resin-based composites is There are few studies, and it is impossible to predict the damage of the resin-pin interface area of ​​the material, so it is difficult to grasp the evolution mechanism of the curing damage, and it is impossible to accurately evaluate the service performance of the material

Method used

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  • Damage determination method and system for curing molding of toughened composite material
  • Damage determination method and system for curing molding of toughened composite material
  • Damage determination method and system for curing molding of toughened composite material

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specific Embodiment

[0167] Step 1: Build as figure 2 The meso-scale model shown adopts the [0 / 45 / 90 / -45]s resin-based composite layering method, and applies a bilinear cohesion model in the resin-pin interface region;

[0168] Step 2: Apply solidification molding load conditions on the mesoscale model, and solve the solidification degree and residual stress of the model. The results are as follows: image 3 , Figure 4 shown;

[0169] Step 3: Apply the obtained curing residual stress as a predefined field on the mesoscale model again, set the resin-pin interface damage criterion, and solve the resin-pin interface curing damage, the result is as follows Figure 5 shown.

[0170] According to the specific embodiments provided by the invention, the invention discloses the following technical effects:

[0171] (1) The present invention uses a numerical simulation analysis method to establish a Z-pin toughened resin-based composite material mesoscale model, a curing temperature field model, a res...

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Abstract

The invention discloses a damage determination method and system for curing molding of a toughened composite material. The method comprises the following steps that the curing degree of the Z-pin toughened resin-based composite material is calculated by utilizing a curing temperature field model according to parameters of the Z-pin toughened resin-based composite material; the curing temperature field model is a heat conduction model established according to a Fourier heat conduction law and an energy balance theorem; according to the curing degree, the current curing residual stress of the resin area and the current curing residual stress of the pin area are calculated through a micro-scale model; according to the current curing residual stress of the resin area and the current curing residual stress of the pin area, the current curing residual stress of the resin-pin interface area is determined by using a cohesion model; and the damage state of the resin-pin interface area is determined according to the current curing residual stress of the resin-pin interface area. According to the method, the curing reaction model is established, so that the curing residual stress of the pin interface in the curing reaction process can be calculated, and the damage condition of the pin interface can be accurately determined.

Description

technical field [0001] The invention relates to the field of solidification molding of composite materials, in particular to a damage determination method and system for solidification molding of toughened composite materials. Background technique [0002] Due to its strong in-plane mechanical properties and poor interlayer mechanical properties, resin-based composite laminates are prone to delamination failure in the actual load-bearing process. As the only interlayer reinforcement technology suitable for prepreg molding at present, Z-pin toughening technology has been widely used in actual production due to its simple process and low cost. Implanted into the prepreg layup along the thickness direction of the material (Z direction), and then put them together into an autoclave to complete the co-curing reaction, and finally obtain a Z-direction reinforced resin-based composite laminate. During the co-curing reaction process, the material properties of each component of the...

Claims

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Application Information

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IPC IPC(8): G01N25/20G01L5/00
CPCG01N25/20G01L5/0047Y02T90/00
Inventor 许英杰张胜男滕薛蓓成吉思远张卫红
Owner NORTHWESTERN POLYTECHNICAL UNIV
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