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Cold expansion and interference fitting both can improve the fatigue life of 7075-T6 aluminum alloy single plates. To study the combination effect of the two techniques on fatigue life improvement, a numerical analysis method was employed to simulate the specimens with different cold expansion and interference fit degrees. Finite element methods were conducted to capture the residual stress, and the...
Predicting elastic properties of braided composites is useful in aerospace structures. In order to predict the properties precisely, fiber undulation and pores in the matrix must be considered during the calculation process. For pores in the matrix, they are considered as inclusions in a kind of isotropic material. Based on inclusion theory, the Mori-Tanaka method is used to predict Young's modulus...
The analysis of three-dimensional (3D) braided composites is difficult due to its complex microstructure. A novel representative unit cell (RUC) and shear specimen model is introduced to predict elastic properties and failure behavior of 3D 8-harness satin weave composites fastener under shear load. The RUC model is developed to predict engineering constants of composites in several damage status...
Compression is a design limiting for composites as its much lower strength than tension. And it is still a challenge to predict the damage process for open-hole composite laminate under compression precisely Therefore, we proposed a progressive finite element model to demonstrate the failure behavior of open-hole laminates under compressive loading(OHC) for high-modulus and high-strength fiber reinforced...
In this paper, a progressive damage model was established on the basis of ABAQUS software for predicting permanent indentation and impact damage in composite laminates. Intralaminar and interlaminar damage was modelled based on the continuum damage mechanics (CDM) in the finite element model. For the verification of the model, low-velocity impact tests of quasi-isotropic laminates with material system...
Composite elastic constants prediction is an essential issue in composite mechanics. In this paper, a variety of experiments are used to measure the macro elastic constants of composite. Then the macro stiffness predictions of unidirectional composite based on finite element analysis (FEM) are conducted. Through this five independent macro elastic constants of composite (EL — longitudinal modulus,...
The damage introduced by low-velocity impact is a threat to adhesively bonded composite joints. The impact response and tensile behaviors after impact of composite scarf joints was investigated using experimental and finite element analysis techniques. 18 specimens were impacted in three different locations and tensile tests after impact were conducted. The test results demonstrated that when impacted...
Torsional buckling and failure of carbon fiber/epoxy resin composite thin-walled tubes (CTWTs) were tested and analyzed, and the effects of torsional buckling on the material failure and failure loads were simulated by finite element method. In order to enhance the torsional bearing capacity of CTWTs, the buckling/failure of the tubes filled with polymer foam were further simulated by ABAQUS. Numerous...
Anisotropic thermal contraction, resin chemical shrinkage and tool-part interaction are the key parameters which induce residual stress in composite parts. For V-shaped composite parts, when released from the tool after autoclave processing, the residual stress causes deformation which acts as a decrease of the enclosed angle called spring-in. Spring-in will affect the manufacturing precision and...
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