A Prediction Method of Delamination Threshold Load Under Lateral Impact of Laminates

A technology of layered threshold and lateral impact, applied in the direction of using one impact force to test the strength of materials, can solve the problem of low prediction accuracy, and achieve the effect of improving the prediction accuracy

Inactive Publication Date: 2016-05-25
SHANGHAI JIAO TONG UNIV
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  • Description
  • Claims
  • Application Information

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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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  • A Prediction Method of Delamination Threshold Load Under Lateral Impact of Laminates
  • A Prediction Method of Delamination Threshold Load Under Lateral Impact of Laminates
  • A Prediction Method of Delamination Threshold Load Under Lateral Impact of Laminates

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Experimental program
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Embodiment

[0028] There is a composite laminate material, the equivalent elastic modulus of the material system E=1.77×10 11 Pa, equivalent Poisson's ratio μ=0.34.

[0029] 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.

[0030] The test piece to calculate the impact delamination threshold load 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 load F under the action of 0.008m impact head 1 The calculation process of is as follows.

[0031] Use a radius of R 0 = 0.0127m punch impacts T0, and the delamination threshold load is 18932N.

[0032] Using the formula (1), the delamination strength S of this material is calculated as 3.54×10 8 Pa.

[0033] The approximate value F′ of the stratified threshold load of T1 is calculated using formula (2) 1 =3173N.

[0...

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Abstract

The invention relates to a predication method for a layered threshold value load under the transverse impact of a laminated board. The predication method comprises the following steps: (1) carrying out an impact test on the composite material laminated board which can have the infinite thickness as a standard test piece to obtain the layered threshold value load; and (2) calculating the layered threshold value load of the predicated laminated board of a same material system by using the layered threshold value load. Compared with the prior art, for the method disclosed by the invention, in the data processing, the influences on the contact radius by the deflection are considered, and the predication method has the advantages of high predication precision and the like.

Description

technical field [0001] The invention relates to a performance measurement technology of a composite material laminate, in particular to a method for predicting a delamination threshold load under lateral impact of a laminate. 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 load. Davies, etc. [1] The delamination threshold load 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 delamination threshold loads using the relationship between hoop shear stress and interlaminar shear strength. However, these prediction...

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
Owner SHANGHAI JIAO TONG UNIV
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