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Data processing method for prediction of multilevel threshold force caused by composite impact

A technology of layered threshold and composite materials, which is applied in the direction of testing the strength of materials using a single impact force, can solve the problems of low prediction accuracy, and achieve the effect of solving the problem of low accuracy.

Inactive Publication Date: 2015-07-08
JINGDEZHEN CHANGHE AVIATION EQUIPMEMT TECH CO LTD
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Problems solved by technology

However, these prediction methods often have problems such as low prediction accuracy.

Method used

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  • Data processing method for prediction of multilevel threshold force caused by composite impact
  • Data processing method for prediction of multilevel threshold force caused by composite impact
  • Data processing method for prediction of multilevel threshold force caused by composite impact

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Experimental program
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Embodiment

[0027] There is a composite laminate material, the equivalent elastic modulus E of this material system is 1.77×10 11 Pa, equivalent Poisson's ratio μ=0.34.

[0028] The reference test piece number is T0, thickness h 0 =0.00846m, its response can be regarded as the impact response of the half-space plate when it is impacted.

[0029] The test piece to calculate the impact delamination threshold force is T1, the equivalent radius of T1 is b=0.09m, and the thickness is h 1 =0.003m, equivalent bending stiffness D=161N·m. its radius R 1 = Delamination threshold force F under the action of 0.008m impact head 1 The calculation process of is as follows.

[0030] Use a radius of R 0 = 0.0127m impact on T0, the delamination threshold force is 18932N.

[0031] Using the formula (1), the delamination strength S of this material is calculated as 3.54×10 8 Pa.

[0032] An approximate value F of the layered threshold force at T1 was calculated using formula (2) 1 '=3173N.

[0033...

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Abstract

The invention relates to a data processing method for the prediction of a multilevel threshold force caused by composite impact, which comprises the following steps: 1) carrying out an impact experiment on the composite laminated board serving as a reference experiment component so as to obtain a multilevel threshold force of the composite laminated board, wherein the thickness of the composite laminated board is regarded as an infinite thickness; and 2) calculating multilevel threshold forces of laminated boards which are different in thickness and belongs to a same material system under the action of impact heads with different radiuses by using the obtained multilevel threshold force. Compared with the prior art, according to the invention, the influence of the deflection of plate on the contact radius is considered in data processing, and therefore, the method has an advantage of high prediction precision.

Description

technical field [0001] The invention relates to a performance measurement technology of a composite material, in particular to a data processing method for predicting the impact delamination threshold force of a composite material. Background technique [0002] Composite laminates are widely used in aeronautical structures, but they are very sensitive to impact loads, and are very prone to delamination damage, resulting in a sharp drop in the compressive strength of the material, thereby greatly reducing the bearing capacity of the structure. In aeronautical structural engineering, sometimes it is necessary to predict layer threshold force. Davies, etc. [1] The delamination threshold force model was established based on the type II interlaminar strain energy release rate of composite materials. Sutherland et al. [2] and Yang [3] et al. predict the delamination threshold force using the relationship between hoop shear stress and interlaminar shear strength. However, thes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/30
Inventor 高尚君于哲峰汪海
Owner JINGDEZHEN CHANGHE AVIATION EQUIPMEMT TECH CO LTD
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