Multiple transverse impact damage behaviors of 3-D-braided composite beams under room and high temperatures

2019 ◽  
Vol 29 (5) ◽  
pp. 715-747
Author(s):  
Meiqi Hu ◽  
Shengkai Liu ◽  
Junjie Zhang ◽  
Lei Wang ◽  
Baozhong Sun ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Impact Damage ◽  
Three Dimensional ◽  
Composite Beams ◽  
Transverse Impact ◽  
Engineering Structure ◽  
Braided Composite ◽  
Impact Deformation ◽  
Initial Modulus ◽  
The Impact

Three-dimensional braided composite materials have been widely applied to engineering structure manufacturing. It is of a great importance to characterize the impact damage of the three-dimensional braided composite under various temperatures for optimizing the engineering structure. Here we conducted transverse impact deformation and damage of three-dimensional braided composite beams with different braiding angles at room and elevated temperatures. A split Hopkinson pressure bar with a heating device combined with high-speed camera was employed to test multiple transverse impact behaviors and to record the impact deformation developments. The results indicated that failure load, initial modulus, and energy absorption decreased with the increase of temperature, whereas the deformation increased slightly with elevated temperatures. We found that the impact brittle damages occurred earlier and the local adiabatic temperature raised higher when the temperature is lower than the glass transition temperature (Tg) of epoxy resin. While above the Tg, the impact ductile damages occurred later and the local temperature raised lower. The thermal stress distribution along the braiding yarn leads to cracks propagation in yarn direction. Part of the impact energy absorptions converted into thermal energy. In addition, the beam with larger braiding angle has high damage tolerance and crack propagation resistance.

Behaviour and design of composite beams with composite slabs at elevated temperatures

2016 ◽  
Vol 20 (10) ◽  
pp. 1451-1465 ◽  
Author(s):  
Shou-Chao Jiang ◽  
Gianluca Ranzi ◽  
Ling-Zhu Chen ◽  
Guo-Qiang Li
Keyword(s):  
Elevated Temperatures ◽  
Numerical Study ◽  
Three Dimensional ◽  
Structural Response ◽  
Load Ratio ◽  
Element Model ◽  
Composite Beams ◽  
European Guidelines ◽  
Design Fire ◽  
Composite Slabs

This article presents an extensive experimental and numerical study aimed at the evaluation of the thermo-structural response of composite beams with composite slabs. Two full-scale fire tests were carried out on simply supported composite steel-concrete beams with steel sheeting perpendicular and parallel to the steel joist, respectively. Both specimens were observed to fail by developing large displacements. Concrete crushing at the mid-span, debonding of the profiled sheeting and spalling of the fire protection were observed during both tests. A three-dimensional finite element model was developed in ABAQUS, and its accuracy was validated against the experimental measurements collected as part of this study. The model was then used to perform a parametric study to determine the influence of the degree of shear connection, load ratio and design fire rate on the structural response of composite beams at elevated temperatures. These results, together with experimental data available in the literature, were used to evaluate the ability of European guidelines to predict the critical temperature of composite beams. It was shown that predictions from Eurocode 4 were safe and provided conservative estimates for most cases.

Impact fracture behaviors of three-dimensional braided composite U-notch beam subjected to three-point bending

2018 ◽  
Vol 28 (3) ◽  
pp. 404-426 ◽  
Author(s):  
Baohui Shi ◽  
Shengkai Liu ◽  
Amna Siddique ◽  
Yongcan Du ◽  
Baozhong Sun ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Mouth Opening ◽  
Impact Fracture ◽  
Image Correlation ◽  
Crack Mouth Opening Displacement ◽  
Crack Mouth ◽  
Opening Displacement ◽  
Braided Composite ◽  
Fracture Behaviors ◽  
The Impact

Impact fracture behaviors of three-dimensional braided composites are critical to designing the braided composite parts. Here we report the impact fracture behaviors of three-dimensional braided composite U-notch beam tested on a modified split Hopkinson pressure bar. Crack mouth opening displacement, deformation process, and crack evolutions were recorded with high-speed photography camera. The digital image correlation method was used to calculate deformation contours of the braided composite. A microstructure model of the three-dimensional braided composite U-notch beam was established for analyzing damage evolution and fracture mechanisms. The histories of deformation, the load, and the crack mouth opening displacement were obtained from the impact fracture test and finite element analysis. It was found that the impact fracture resistance and morphologies were influenced by the braided structure and braided yarn orientations. The crack generated at the notch tip and then propagated along the braided angle direction rather than the perpendicular direction that often occurred for isotropic materials, such as the epoxy resin solid. The combinations of different braided angle and yarns are recommended for high impact fracture behavior design.

scholarly journals Interface Failure of Heated GLARETM Fiber–Metal Laminates under Bird Strike

Aerospace ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 28
Author(s):  
Md.Zahid Hasan
Keyword(s):  
Glass Fiber ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Impact Damage ◽  
Strain Energy Release ◽  
Fiber Reinforced ◽  
Interface Failure ◽  
Glass Fiber Reinforced ◽  
Cohesive Interfaces ◽  
The Impact

Many high-strength composite materials have been developed for aircraft structures. GLAss fiber REinforced aluminum (GLARE) is one of the high-performance composites. The review of articles, however, yielded no study on the impact damage of heated GLARE laminates. This study, therefore, aimed at developing a numerical model that can delineate the continuum damage of GLARE 5A-3/2-0.3 laminates at elevated temperatures. In the first stage, the inter-laminar interface failure of heated GLARE laminate had been investigated at room temperature and 80 °C. The numerical analysis employed a three-dimensional GLARE 5A-3/2-0.3 model that accommodated volumetric cohesive interfaces between mating material layers. Lagrangian smoothed particles populated the projectile. The model considered the degradation of tensile and shear modulus of glass fiber reinforced epoxy (GF/EP) at 80 °C, while incorporated temperature-dependent critical strain energy release rate of cohesive interfaces. When coupled with the material particulars, an 82 m/s bird impact at room temperature exhibited delamination first in the GF/EP 90°/0° interface farthest from the impacted side. Keeping the impact velocity, interface failure propagated at a slower rate at 80 °C than that at room temperature, which was in agreement with the impact damage determined in the experiments. The outcomes of this study will help optimize a GLARE laminate based on the anti-icing temperature of aircraft.

scholarly journals Investigation of the Internal Structure of Fiber Reinforced Geopolymer Composite under Mechanical Impact: A Micro Computed Tomography (µCT) Study

2019 ◽  
Vol 9 (3) ◽  
pp. 516 ◽  
Author(s):  
Sneha Samal ◽  
Marcela Kolinova ◽  
Hubert Rahier ◽  
Giovanni Dal Poggetto ◽  
Ignazio Blanco
Keyword(s):  
Computed Tomography ◽  
Internal Structure ◽  
Impact Damage ◽  
Three Dimensional ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Micro Computed Tomography ◽  
Mechanical Impact ◽  
The Impact ◽  
Geopolymer Composites

The internal structure of fiber reinforced geopolymer composite was investigated by microfocus X-ray computed tomography (µCT) under mechanical impact. µCT is a non-destructive, multi approach technique for assessing the internal structures of the impacted composites without compromising their integrity. The three dimensional (3D) representation was used to assess the impact damage of geopolymer composites reinforced with carbon, E-glass, and basalt fibers. The 3D representations of the damaged area with the visualization of the fiber rupture slices are presented in this article. The fiber pulls out, and rupture and matrix damage, which could clearly be observed, was studied on the impacted composites by examining slices of the damaged area from the center of the damage towards the edge of the composite. Quantitative analysis of the damaged area revealed that carbon fabric reinforced composites were much less affected by the impact than the E-glass and basalt reinforced composites. The penetration was clearly observed for the basalt based composites, confirming µCT as a useful technique for examining the different failure mechanisms for geopolymer composites. The durability of the carbon fiber reinforced composite showed better residual strength in comparison with the E-glass fiber one.

Impact Response and Simulation of Damaged Ulna With Internal Fixation

2012 ◽  
Vol 28 (3) ◽  
pp. 324-334
Author(s):  
Cameron Coates ◽  
Priya Goeser ◽  
Camille Coates-Clark ◽  
Mark Jenkins
Keyword(s):  
Impact Test ◽  
Impact Load ◽  
Impact Damage ◽  
Dynamic Compression ◽  
Dynamic Strain ◽  
Fe Model ◽  
Transverse Impact ◽  
Case Scenario ◽  
Worst Case ◽  
The Impact

The objectives of this work were to explore a methodology that combines static and dynamic finite element (FE) analysis, linear elastic fracture mechanics (LEFM) and experimental methods to investigate a worst-case scenario in which a previously damaged bone plate system is subjected to an impact load. Cadaver ulnas with and without midshaft dynamic compression plates are subjected to a static three-point bend test and loaded such that subcritical crack growth occurs as predicted by a hybrid method that couples LEFM and static FE. The plated and unplated bones are then unloaded and subsequently subjected to a midshaft transverse impact test. A dynamic strain-based FE model is also developed to model the midshaft transverse impact test. The average value of the impact energy required for failure was observed to be 10.53% greater for the plated set. There appears to be a trade-off between impact damage and impact resistance when ulnas are supported by fixation devices. Predictions from the dynamic FE model are shown to corroborate inferences from the experimental approach.

scholarly journals Improvement of Impact Damage Resistance of Epoxy-Matrix Composites Using Ductile Hollow Fibers

2013 ◽  
Vol 8 (1) ◽  
pp. 155892501300800
Author(s):  
Mohammad Nasr-Isfahani ◽  
Masoud Latifi ◽  
Mohammad Amani-Tehran
Keyword(s):  
Impact Damage ◽  
Fiber Composites ◽  
Filament Winding ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Experimental Investigations ◽  
Matrix Composites ◽  
Transverse Impact ◽  
Low Velocity ◽  
The Impact

Fiber reinforced polymer structures typically respond very poorly to transverse impact events. In this study, some experimental investigations are performed on the low velocity impact behavior of unidirectional hollow, solid and hybrid (hollow/solid) polyester fiber composites. The materials are fabricated in a curved shape using filament winding method. The impact tests are applied on the simply supported specimens by a drop weight impact test apparatus at five levels of energy. To present a proper comparison on the results, the various densities of the materials are considered as normalizing coefficients. It is observed that in the hollow fiber composites cracks appear at an appreciably higher amount (93%) of impact energy than the solid ones.

A Smart Polymer Composite for Repeatedly Self-Healing Impact Damage in Fiber Reinforced Polymer (FRP) Vessels

2011 ◽  
Author(s):  
Jones Nji ◽  
Guoqiang Li
Keyword(s):  
Polymer Composite ◽  
Impact Damage ◽  
Glass Fibers ◽  
Shape Memory Polymer ◽  
Impact Resistance ◽  
Three Dimensional ◽  
Polymer Composite Material ◽  
Self Healing ◽  
Repeated Impact ◽  
The Impact

This paper investigated the impact properties of a novel polymer composite material with a potential to repeatedly self-heal impact damage in FRP vessels. The composite was fabricated by first dispersing copolyster thermoplastic particles in a shape memory polymer (SMP) matrix, and then reinforcing the material with three-dimensional (3D) woven glass fibers. Specimens of the reinforced composite with dimensions of 152 mm × 101 mm × 12.7 mm were produced by machining and divided into two groups (G1 and G2). G1 specimens were subjected to several impact/healing test cycles with 42 J of impact energy. G2 specimens were subjected to repeated impact test cycles with no healing at the same energy level. A third group of specimens without thermoplastic particles (G3), with identical dimensions as G2 was also produced and tested in a similar manner as G2 to evaluate the effects of thermoplastic particles on impact resistance. G2 specimens were perforated at the 40th impact while G3 specimens were perforated at the 27th impact. G1 specimens lasted an additional 9 rounds of impact to a total of 49 impacts compared to G2 specimens.

Impact Deformation Model of Thin-Walled Shell Filled with Explosive under High Axial Shock Overload

2013 ◽  
Vol 455 ◽  
pp. 279-285
Author(s):  
Xiao Xia Sun ◽  
Wei Liu ◽  
Rui Qi Shen ◽  
Ying Hua Ye ◽  
Li Zhi Wu
Keyword(s):  
Plastic Deformation ◽  
Impact Damage ◽  
Plastic Deformation Zone ◽  
Deformation Model ◽  
Deformation Degree ◽  
Impact Stress ◽  
Gas Gun ◽  
Impact Deformation ◽  
Thin Walled ◽  
The Impact

The thin-walled shell axial impact deformation of one-leg electric detonator with different density charge was studied. The impact stress was analyzed, and on the basis of kinetic theory the impact deformation model was established for the thin-walled shell filled with explosive. The experiments were verified at 60 000g, 80 000g, 100 000g and 120 000g by gas gun. The results show that shell length decreases and the plastic deformation zone diameter increases after impact. Damage deformation degree decreases with increased shell strength, reduced shell and internal charging mass summation and reduced impact velocity square. The model calculated value agrees well with the test data. The deformation model can be used to predict overload damage deformation for such detonator.

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