Experimental Investigation of Tensile Damage Mechanisms on 3-D Braided Composites with AE

2013 ◽  
Vol 345 ◽  
pp. 290-293 ◽  
Author(s):  
Shi Yan ◽  
Li Li Jiang ◽  
Dong Hua Li
Keyword(s):  
Fracture Process ◽  
Event Rate ◽  
Peak Frequency ◽  
Textile Composites ◽  
Displacement Curve ◽  
Braided Composites ◽  
Cumulative Energy ◽  
Damage Mechanisms ◽  
3D Braided Composites ◽  
Fracture Processes

In this paper, the fracture process of 3D four-directional carbon/epoxy braided composites with different braiding angles under the monotonic tensile loading were investigated by the acoustic emission (AE) technique. The AE cumulative energy, event rate, amplitude, and the peak frequency were analyzed. At the same time, combining with the load-displacement curve varying feature, the fracture processes were divided into different stages to deeply understand the damaged mechanisms of the textile composites. Furthermore, the fracture surfaces of the specimens were observed under optical microscopy. Results reveal that the behavior of AE parameters described well the fracture process in the 3D braided composites with different braiding angles, and the damage mechanisms of the composites can be successfully identified by AE characteristics.

Experimental Investigation of Low Velocity Impact and Residual Compressive Properties of Composite Laminates Based on AE

2013 ◽  
Vol 345 ◽  
pp. 214-217
Author(s):  
Shi Yan ◽  
Ying Guo ◽  
Xia Mei Lu
Keyword(s):  
Composite Laminates ◽  
Fracture Process ◽  
Peak Frequency ◽  
Low Velocity Impact ◽  
Displacement Curve ◽  
Compressive Failure ◽  
Compressive Properties ◽  
Low Velocity ◽  
Velocity Impact ◽  
Fracture Processes

The low-velocity impact and residual compressive failure processes of composite laminate were investigated by the acoustic emission (AE) technique in this paper. The AE energy, amplitude, and the peak frequency were analyzed. At the same time, combining with the load-displacement curve varying feature, the compressive fracture processes were divided into different stages to deeply understand the damaged mechanisms of the composites. Results reveal that the behavior of AE parameters described well the fracture process of the composites.

Study on Acoustic Emission Signatures during the Process of Edge Chipping for Engineering Ceramics

2011 ◽  
Vol 697-698 ◽  
pp. 93-96 ◽  
Author(s):  
Xiu Jian Tang ◽  
Xin Li Tian ◽  
Jian Quan Wang ◽  
Ya Tao Mao ◽  
F.Q. Li
Keyword(s):  
Acoustic Emission ◽  
Fracture Process ◽  
Static Load ◽  
Average Frequency ◽  
Displacement Curve ◽  
Edge Chipping ◽  
Kaiser Effect ◽  
Engineering Ceramics ◽  
Highly Active ◽  
Fracture Processes

The developments of edge chipping for engineering ceramics are analyzed. An edge chipping experiment under static load is adopted to study the fracture process of edge chipping. The results show that the fracture processes of edge chipping under different edge distances are similar, which can be divided into four stages based on load-displacement curve. There is obviously Kaiser Effect during the fracture processes of edge chipping. Counts, average frequency, RMS, duration, amplitude and inverse calculation can be used to describe the process of edge chipping for engineering ceramics. Amplitude, duration and average frequency become highly active on the eve of fracture, which can be regard as the omens of edge chipping and used to predict the fracture of edge chipping.

A computational approach with surface-based cohesive contact for meso-scale interface damage simulation in 3D braided composites

2020 ◽  
pp. 152808372098017
Author(s):  
Chao Zhang ◽  
Jianchun Liu ◽  
Tinh Quoc Bui ◽  
Jose L Curiel-Sosa ◽  
Jinzhong Lu
Keyword(s):  
Damage Evolution ◽  
Textile Composites ◽  
Interface Debonding ◽  
Progressive Damage ◽  
Fe Model ◽  
Matrix Interface ◽  
Braided Composites ◽  
3D Braided Composites ◽  
Damage Simulation ◽  
Meso Scale

The yarn/yarn and yarn/matrix interface debonding has been recognized as a vital failure mode of 3 D braided composites. We present in this paper a meso-scale finite element (FE) model, which considers yarn/yarn and yarn/matrix interface debonding, for modeling progressive damage evolution of 3 D braided composites under typical tensile and shear loadings. In this setting, the damage state of braiding yarns and matrix is described through a continuum damage model (CDM) coupled with Murakami damage tensor; a bilinear traction-separation description is employed to govern the yarn/yarn and yarn/matrix interface behavior modeled by surface-based cohesive contact. We thus develop a user-material subroutine VUMAT (ABAQUS/Explicit) for our progressive damage simulation, including stress analysis, failure analysis and material properties degradation scheme. The mechanical properties of 3 D braided composites, and more importantly the damage evolution of interface debonding are thoroughly analyzed. The proposed FE modeling strategy provides a new perspective for the interface response study of other textile composites.

Investigation of Compressive Damage Mechanisms in 3D Braided Composites by the Acoustic Emission Events Energy and Amplitude

2013 ◽  
Vol 274 ◽  
pp. 393-397 ◽  
Author(s):  
Shi Yan ◽  
Shi Dong Pan ◽  
Dong Hua Li ◽  
Ji Cai Feng
Keyword(s):  
Acoustic Emission ◽  
Deformation Behavior ◽  
Compressive Loading ◽  
Damage Mechanism ◽  
Braided Composites ◽  
Damage Mechanisms ◽  
3D Braided Composites ◽  
Damage Process ◽  
Compressive Damage ◽  
Fracture Growth

The deformation behavior and damage mechanism of 3-D carbon/epoxy braided composites with different braiding angles under the monotonic compressive loading are investigated by the acoustic emission (AE) technique. The damage process is divided into several different regions based on the change of the accumulative AE event counts. Correlations between the damage mechanisms and the AE results are established in terms of the events energy and amplitude. These correlations can be used to monitor the fracture growth process in the braided composites. Experimental results reveal that the AE technique is an effective tool for identifying damage mechanisms.

A review of numerical modeling of three-dimensional braided textile composites

2011 ◽  
Vol 45 (23) ◽  
pp. 2415-2436 ◽  
Author(s):  
Guodong Fang ◽  
Jun Liang
Keyword(s):  
Mesh Generation ◽  
Complex Geometry ◽  
Impact Load ◽  
Three Dimensional ◽  
Textile Composites ◽  
Braided Composites ◽  
Damage Development ◽  
Damage Models ◽  
Geometry Modeling ◽  
3D Braided Composites

Three-dimensional (3D) braided composites with high specific energy absorption behavior and excellent fatigue performances are widely used in structures under cycle or impact load. A comprehensive literature survey is conducted to review the numerical analysis methods of 3D braided composites, including meso-geometry modeling, mesh generation techniques, and progressive damage models. When the 3D braided composites are manufactured during a process cycle, the braid yarn can move and becomes a ‘deviated or imperfect’ architecture. Elaborate meso-geometrical models which directly influence the precision of numerical results can be established by different methods. Different mesh generation techniques of different numerical methods, which manage to discretize the complex geometry models, are provided. An analysis of various models involved in the prediction of damage development and failure of 3D braided composites by using finite element method is presented. This study highlights the importance of recognizing the meso-structure for analyzing mechanical behavior of 3D braided composites.

A multiscale elasto-plastic damage model for the nonlinear behavior of 3D braided composites

2019 ◽  
Vol 171 ◽  
pp. 21-33 ◽  
Author(s):  
Chunwang He ◽  
Jingran Ge ◽  
Dexing Qi ◽  
Jiaying Gao ◽  
Yanfei Chen ◽  
...  
Keyword(s):  
Damage Model ◽  
Nonlinear Behavior ◽  
Braided Composites ◽  
3D Braided Composites ◽  
Plastic Damage
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