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Carbon fiber composite material fatigue life estimating method based on stress ratio influences

A technology of composite materials and fatigue life, applied in the direction of analyzing materials, special data processing applications, measuring devices, etc., can solve problems such as low precision and low accuracy, and achieve the effect of improving modeling accuracy, improving accuracy, and strong engineering applicability

Inactive Publication Date: 2014-07-23
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0009] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a method for evaluating the fatigue life of carbon fiber composite materials based on the influence of stress ratio. Based on the classic laminated plate theory, the stress response of the carbon fiber composite material structure is obtained by numerical means, combined with experimental means, to obtain Constant-amplitude load fatigue life curves and damage accumulation criteria under variable-amplitude loads, and then predict the fatigue life of actual structures under arbitrary loads, and overcome the problems of insufficient life prediction methods and low accuracy of current carbon fiber composite materials

Method used

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  • Carbon fiber composite material fatigue life estimating method based on stress ratio influences
  • Carbon fiber composite material fatigue life estimating method based on stress ratio influences
  • Carbon fiber composite material fatigue life estimating method based on stress ratio influences

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Embodiment 1

[0038] Such as figure 1 As shown, this embodiment includes the following steps:

[0039] Step 1, carbon fiber composite material quasi-static mechanical experiment, the shape and size of the test piece are as follows figure 2 with image 3 Shown are the tensile and compressive samples, respectively. The material is carbon fiber-reinforced epoxy resin-based plain weave composite material. The carbon fiber is TC33-3K produced by Taili Company, and the resin and curing agent are produced by Hunsman Company. The brands are LY1564 and Aradur3486 respectively. The basic properties of the reinforcement phase and the matrix phase are shown in Table 1. Five valid data were measured for each material in tension and compression experiments. Displacement control was adopted in the experiment, and the loading deformation rate was kept constant at 0.5mm / min.

[0040] Table 1 Fiber and matrix properties

[0041]

[0042] According to ASTM D3039 / D3039M–08 and ASTM D3410 / D3410M–03 of...

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Abstract

The invention belongs to the technical field of composite materials, and discloses a carbon fiber composite material fatigue life estimating method based on stress ratio influences. Structural response calculation is carried out by means of a finite element technology. A finite element model is based on a classical laminate plate theory, and a umat subprogram taking tension and compression asymmetry into consideration is built. By carrying out constant-amplitude fatigue tests under different stress ratios, an equation of an influence mechanism of average stress on prediction of the service life of a carbon fiber composite material structure is built and is popularized to a block load and a spectrum load. A service life estimating model built through the method is based on the classical laminate plate theory and takes influences of the average stress and a variable-amplitude load into consideration, dispersity of a prediction result is little, accuracy is high, theoretical guidance is provided for reliability design of parts made of carbon fiber composite materials, and the technical problems that existing carbon fiber composite material structure fatigue life is only estimated through a test method, and accordingly cost is high and consumed time is long are solved.

Description

technical field [0001] The invention relates to a method in the technical field of composite material testing, in particular to a method for evaluating the fatigue life of carbon fiber composite materials based on the influence of stress ratio. Background technique [0002] Carbon fiber composite materials have excellent mechanical properties (high specific strength and specific modulus, good fatigue resistance, good damping and vibration reduction performance), and can also be designed and manufactured according to the requirements of service conditions to meet various special purposes. Greatly improving the efficiency of engineering structures, it has become a new type of contemporary engineering materials, and has been widely used in aerospace, automobile industry, shipbuilding industry, energy industry, etc. [0003] Composite materials are anisotropic materials composed of fiber phase, matrix phase and interface phase. A large number of experimental results show that wh...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01N3/00
Inventor 朱平籍庆辉卢家海冯奇何健张晓红周庆伟
Owner SHANGHAI JIAO TONG UNIV
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