X-ray tomography and numerical study on low-velocity impact damages of three-dimensional angle-interlock woven composites

2019 ◽  
Vol 230 ◽  
pp. 111525 ◽  
Author(s):  
Wenjing Cao ◽  
Junjie Zhang ◽  
Baozhong Sun ◽  
Bohong Gu
Keyword(s):  
Numerical Study ◽  
Three Dimensional ◽  
Low Velocity Impact ◽  
Woven Composites ◽  
Low Velocity ◽  
Velocity Impact ◽  
X Ray ◽  
Impact Damages

Finite Element Analyses on Low-velocity Impact Responses of Three-dimensional Braided Composites

2021 ◽  
Author(s):  
Yuan-yuan Li ◽  
Zheng-qiang Lyu ◽  
Ping Wang ◽  
Ya-lan Wang ◽  
Ting Chen ◽  
...  
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Low Velocity Impact ◽  
Finite Element Analyses ◽  
Braided Composites ◽  
Low Velocity ◽  
Velocity Impact ◽  
Impact Responses

Coda Waves for Health Monitoring of Composites Under Low-Velocity Impact

2021 ◽  
Author(s):  
Subal Sharma ◽  
Vinay Dayal
Keyword(s):  
Ultrasonic Waves ◽  
Coda Waves ◽  
Low Velocity Impact ◽  
Coda Wave ◽  
Low Velocity ◽  
Fibrous Composite Material ◽  
Velocity Impact ◽  
Isotropic Composite ◽  
The Impact ◽  
Impact Damages

Abstract Coda waves have been shown to be sensitive to lab-controlled defects such as very small holes in fibrous composite material. In the real world, damages are subtler and more irregular. The main objective of this work is to investigate coda wave capability to detect low-velocity impact damages. The emphasis is to detect the presence of barely visible impact damages using ultrasonic waves. Detection of incipient damage state is important as it will grow over the life of the structure. Differential features, previously used in similar work, have been utilized to detect realistic impact damages on carbon fiber composites. Quasi-isotropic composite laminates were subjected to low-velocity impact energy ranging from 2J to 4.5J. Two differential features reported could be used detect the presence of damage. It is also observed that ply orientation can be a deterministic factor for indicating damages. The size and shape of the impact damage has been characterized using ultrasonic C-scans. Results indicate that coda waves can be used for the detection of damage due to low-velocity impact.

scholarly journals A Strain Rate Dependent Progressive Damage Model for Carbon Fiber Woven Composites under Low Velocity Impact

2021 ◽  
Vol 2101 (1) ◽  
pp. 012073
Author(s):  
Xueyao Hu ◽  
Jiaojiao Tang ◽  
Wei Xiao ◽  
Kepeng Qu
Keyword(s):  
Strain Rate ◽  
Damage Model ◽  
Low Velocity Impact ◽  
Woven Composites ◽  
Progressive Damage ◽  
Low Velocity ◽  
Velocity Impact ◽  
Rate Dependent ◽  
Plane Direction ◽  
Progressive Damage Model

Abstract A progressive damage model was presented for carbon fiber woven composites under low velocity impact, considering the strain rate sensitivity of both mechanical properties and failure mechanisms. In this model, strain rate dependency of elastic modulus and nominal strength along in-plane direction are considered. Based on the Weibull distribution, stiffness progressive degradation is conducted by introducing strain rate dependent damage variables for distinct damage modes. With the model implemented in ABAQUS/Explicit via user-defined material subroutine (VUMAT), the mechanical behavior and possible damage modes of composites along in-plane direction can be determined. Furthermore, a bilinear traction separation model and a quadratic stress criterion are applied to predict the initiation and evolution of interlaminar delamination. Comparisons are made between the experimental results and numerical simulations. It is shown that the mechanical response and damage characteristics under low velocity impact, such as contact force history and delamination, are more consistent with the experimental results when taken the strain rate effect into consideration.

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.

Numerical study of composite laminates subjected to low-velocity impact using a localized damage algorithm of Puck's 3D IFF criterion

2020 ◽  
Vol 228 ◽  
pp. 106901
Author(s):  
Fuwei Gu ◽  
Xinyi Yuan ◽  
Xiaolei Zhu ◽  
Xiaofeng Lu ◽  
Daining Fang ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Numerical Study ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Localized Damage
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