scholarly journals Application of the Experiment Design Method in Modelling the Temperature Effect on the Behaviour at a Low Velocity Impact Damage of Epoxy Matrix Reinforced with Unidirectional Carbon Fiber Composite

2012 ◽  
Vol 2 (3) ◽  
pp. 44-48 ◽  
Author(s):  
Zenasni Ramdane ◽  
Hebbar Ahmed ◽  
Jaime Vina Olay
Keyword(s):  
Carbon Fiber ◽  
Temperature Effect ◽  
Epoxy Matrix ◽  
Impact Damage ◽  
Design Method ◽  
Fiber Composite ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Carbon Fiber Composite ◽  
Velocity Impact

Analysis of Patch Bonded Repair to Carbon Fiber Composite Laminates with Low Velocity Impact Damage

2011 ◽  
Vol 335-336 ◽  
pp. 226-229
Author(s):  
Lun Wang ◽  
Wan Lin Zhou ◽  
Xue Gang Shi
Keyword(s):  
Carbon Fiber ◽  
Composite Laminates ◽  
Impact Damage ◽  
Fiber Composite ◽  
Element Model ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Carbon Fiber Composite ◽  
Velocity Impact ◽  
Bonded Repair

In this paper, low-velocity impact residual tensile strength of carbon fiber composite laminates are investigated by experiment. The triple-plate-string-element finite element model was used to calculate the strength of repaired structures of the damage. The corresponding strength tests were conducted to verify the computational results. According to the computational and experimental results, the influence of the repair parameters on the repair efficiency was analyzed, such as the overlap length and the thickness of the patch.

The Study of Low-Velocity Impact Characteristics and Residual Tensile Strength of Carbon Fiber Composite Lattice Core Sandwich Structures

2011 ◽  
Vol 194-196 ◽  
pp. 117-120 ◽  
Author(s):  
Xai Mei Lu ◽  
Yun Fei Ma ◽  
Shi Xun Wang
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Sandwich Structures ◽  
Fiber Composite ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Carbon Fiber Composite ◽  
Velocity Impact ◽  
Composite Lattice ◽  
Lattice Core

In this paper, low-velocity impact characteristics and residual tensile strength of carbon fiber composite lattice core sandwich structures are investigated experimentally and numerically. Low-velocity impact tests and residual tensile strength tests are simulated by the FE (finite element) software, ABAQUS/Explicit and its subroutine (VUMAT). In order to give more detailed description about the impact damage of the structure and improve modeling accuracy, multi-steps analysis method is employed to simulate impact process and residual tensile strength test in one analysis model. The calculation results computed by the FE model have been compared to the value of experiments, the difference of impact process simulation is about 3.3% and that of tensile strength test simulation is about 12.9%. The calculation error of computation model is acceptable, since unavoidable damage could be introduced in the courses of manufacture, processing and transportation of composite materials, and these damages are determinated difficultly in the computation programs. Next, the degradation tendency chart of residual tensile strength and impact energy threshold Uo of carbon fiber composite lattice core sandwich structures are obtained by the computation value of residual tensile strength after impacted with different impact energy. Previously, this threshold can only be obtained by experiment tests. After the contact force which is bigger than the threshold Uo impact on the sandwich structures, the residual tensile strength of structures are degraded greatly. This conclusion is significant for the design and application of carbon fiber composite lattice core sandwich structures.

scholarly journals Mechanical Characterization and Impact Damage Assessment of Hybrid Three-Dimensional Five-Directional Composites

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1395 ◽  
Author(s):  
Liwei Wu ◽  
Wei Wang ◽  
Qian Jiang ◽  
Chunjie Xiang ◽  
Ching-Wen Lou
Keyword(s):  
Carbon Fiber ◽  
Impact Load ◽  
Hybrid Composites ◽  
Impact Damage ◽  
Three Dimensional ◽  
Low Velocity Impact ◽  
Aramid Fibers ◽  
Braided Composites ◽  
Low Velocity ◽  
Velocity Impact

The effects of braided architecture and co-braided hybrid structure on low-velocity response of carbon-aramid hybrid three-dimensional five-directional (3D5d) braided composites were experimentally investigated in this study. Low-velocity impact was conducted on two types of hybridization and one pure carbon fiber braided reinforced composites under three velocities. Damage morphologies after low-velocity impact were detected by microscopy and ultrasonic nondestructive testing. Interior damages of composites were highly dependent on yarn type and alignment. Impact damage tolerance was introduced to evaluate the ductility of hybrid composites. Maximum impact load and toughness changed with impact velocity and constituent materials of the composites. The composite with aramid fiber as axial yarn and carbon fiber as braiding yarn showed the best impact resistance due to the synergistic effect of both materials. Wavelet transform was applied in frequency and time domain analyses to reflect the failure mode and mechanism of hybrid 3D5d braided composites. Aramid fibers were used either as axial yarns or braiding yarns, aiding in the effective decrease in the level of initial damage. In particular, when used as axial yarns, aramid fibers effectively mitigate the level of damage during damage evolution.

Low-Velocity Impact Characteristics of Carbon Fiber Composites Lattice Core Sandwich Structures

2009 ◽  
Vol 79-82 ◽  
pp. 127-130 ◽  
Author(s):  
Shi Xun Wang ◽  
Lin Zhi Wu ◽  
Li Ma
Keyword(s):  
Carbon Fiber ◽  
Sandwich Structures ◽  
Impact Damage ◽  
Composite Plates ◽  
Fiber Composites ◽  
Low Velocity Impact ◽  
Carbon Fiber Composites ◽  
Low Velocity ◽  
Velocity Impact ◽  
Numerical Predictions

Since composite sandwich structures are susceptible to low-velocity impact damage, a thorough characterization of the loading and damage process during impact is important. In the present paper, the low-velocity impact response of carbon fiber composites lattice structures are investigated by experimental and numerical methods. Impact tests on composite plates are performed using an instrumented drop-weight machine (Instron 9250HV) and a new damage mode is observed. A three-dimensional finite element model is built by ABAQUS/Explicit and user subroutine (VUMAT) to predict the peak loading and simulate the complicated damage problem. It can be found that numerical predictions coincide well with experimental results.

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