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Method for calculating drilling layering critical axial force of composite material plate by considering deformation

A composite material plate and composite material technology, applied in the calculation field of critical axial force of carbon fiber composite material plate drilling delamination, can solve problems such as no consideration

Active Publication Date: 2019-08-30
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] At present, the critical axial force calculation method for drilling delamination defects in carbon fiber composites does not consider the influence of component bending deformation caused by drilling force on drilling delamination when the thickness of the composite material component is small and the stiffness is low

Method used

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  • Method for calculating drilling layering critical axial force of composite material plate by considering deformation
  • Method for calculating drilling layering critical axial force of composite material plate by considering deformation
  • Method for calculating drilling layering critical axial force of composite material plate by considering deformation

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Embodiment Construction

[0071] The specific implementation manner of the present invention will be described in detail below in conjunction with the technical scheme and the accompanying drawings.

[0072] In this example, the workpiece is 20-layer carbon fiber composite material unidirectional plate, the thickness of the workpiece is 4mm, and the thickness of each layer is 0.2mm. figure 2 The 1st direction is along the fiber direction, the elastic modulus is 198.3GPa, the 2nd direction is the in-plane perpendicular to the fiber direction, the elastic modulus is 8.0GPa, the Poisson’s ratio is 0.3, the shear modulus is 4.14GPa, and the interlayer energy release The rate is 420J / m 2 , The diameter of the drilling tool is 6mm. The clamp hole diameter is 25mm.

[0073] From the classical laminate theory, it can be calculated that when the remaining uncut layer is 1 layer, the stiffness coefficients of the local area and the overall area are respectively:

[0074] D. 11part =0.1327MPa,D 12part =0.00...

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Abstract

The invention discloses a method for calculating drilling layering critical axial force of a composite material plate by considering deformation. The method is characterized in that: aiming at the drilling layering defect of the carbon fiber composite material with smaller thickness, the influence of the bending deformation of the composite material component on the drilling layering in the drilling process is considered, and the critical axial force for generating the layering defect is calculated, and then the layering defect in the drilling process is effectively predicted; and meanwhile, the combined action of a tool chisel edge and a main cutting edge is considered, and the axial force borne by the tool chisel edge part is equivalent to the concentrated force effect, and the axial force borne by the tool main cutting edge is equivalent to the uniform distribution force effect, and the drilling layered critical axial force considering the overall and local bending deformation of the composite material is finally obtained by applying the virtual displacement principle. According to the method, the stress condition of the tool in the drilling process and the deformation conditionof the composite material are fully considered; the carbon fiber composite material drilling layering defect prediction model is established; the drilling layering critical axial force is calculated;and the method has a very good effect on inhibiting the drilling layering defects of the carbon fiber composite material.

Description

technical field [0001] The invention belongs to the technical field of drilling in mechanical processing, and relates to a calculation method for the critical axial force of the drilling delamination of a carbon fiber composite material plate. Background technique [0002] Carbon fiber reinforced resin matrix composites have the characteristics of high specific strength, high specific modulus, and designable performance. They are very typical lightweight high-strength materials and have been widely used in aerospace, transportation and other fields. However, defects such as delamination and tearing produced during the processing of composite materials will seriously affect the performance of composite materials. Among them, the delamination defect of carbon fiber composite materials is considered to be the most serious one in the process of composite material processing. It is the direct factor that causes delamination, especially when the stiffness of the composite material...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06G06F30/20
Inventor 牛斌马国锐
Owner DALIAN UNIV OF TECH
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