Failure behaviors of 3D braided composites with defects in different locations under low-velocity impact compression

2021 ◽  
pp. 004051752110308
Author(s):  
Jinhui Guo ◽  
Baozhong Sun ◽  
Bohong Gu ◽  
Wei Zhang
Keyword(s):  
High Speed ◽  
Central Zone ◽  
Low Velocity Impact ◽  
Bottom Surface ◽  
High Speed Photography ◽  
Low Velocity ◽  
Impact Compression ◽  
Velocity Impact ◽  
Braided Composite ◽  
3D Braided Composites

This paper aims to investigate the effects of the impurity defects in different locations on the transverse compressive behaviors of three-dimensional (3D) braided carbon fiber/epoxy composites under low-velocity impact. The composites with defects in different locations were prepared by placing polytetrafluoroethylene particles at the bottom surface, corner and center parts, respectively. The compression test was implemented with the drop-weight impact method. The failure morphologies were characterized using high-speed photography and micro computed tomography (Micro-CT). A mesoscale finite element model considering the defect was developed to enhance the physical understanding of the compression process. It is found that defects located at the corner zone and the central zone have a greater impact on the compression behavior of the 3D braided composite than the defect located at the bottom surface part. The defects at the corner and center zones reduce the compressive strength of the composite, increase the failure area, and cause severe damage to both the yarn and resin. In addition, the defect causes local stress concentration on the surrounding yarns. The defects in different locations cannot change the main shear failure mode of the 3D braided composite. It is shown that great attention should be given during the manufacturing or detection process to avoid such a deterioration effect of defects located in those zones on composite strength.

scholarly journals Transverse Low Velocity Impact Failure Behavior of Triaxial Braided Composite Tube with Different Braiding Angles

2016 ◽  
Vol 28 (4) ◽  
pp. 246-252
Author(s):  
Ji-hyun Sim ◽  
Sung-min Park ◽  
Ji-hye Kim ◽  
Dong-woo Shin ◽  
Jin-sung Chon ◽  
...  
Keyword(s):  
Low Velocity Impact ◽  
Failure Behavior ◽  
Low Velocity ◽  
Impact Failure ◽  
Velocity Impact ◽  
Braided Composite ◽  
Composite Tube

Investigation on Shock Response of Magnesium Alloy Honeycomb Sandwich Panels under Low Velocity Impact Loading

2011 ◽  
Vol 675-677 ◽  
pp. 547-550
Author(s):  
Hong Yang Zhao ◽  
Dong Ying Ju ◽  
Yasumi Ito ◽  
Tetsuya Nemoto ◽  
Yoshie Takahashi
Keyword(s):  
Magnesium Alloy ◽  
High Speed ◽  
Sandwich Panels ◽  
Low Velocity Impact ◽  
Dynamic Force ◽  
Low Velocity ◽  
Velocity Impact ◽  
Honeycomb Sandwich ◽  
Shock Response ◽  
The Impact

This paper describes the results of an experimental investigation on the drop off impact test on a range of sandwich panels. The magnesium alloy sandwich panels were fabricated with rolled sheets at different thickness by pressing and bonding method. Out-plane compression test was employed to obtain its basic deformation-force behavior. The impact experiments were carried out in which a steel cylinder was dropped off at various height levels, ranging from 0.5m to 1.5 cm to impact the panel. A high speed camera was employed to take pictures at 20 thousand frames per second and the low-velocity impact response on the sandwich panels is recorded with a dynamic force senor under the panel simultaneously. The shock response with time and the impact absorption energy were analyzed and compared. The results of this study proved that the magnesium alloy honeycomb sandwich panels have good impact energy absorption performance.

A Study on Low Velocity Impact Behaviour of Functionally Graded Sandwich Conical Shell Under Thermal Environment

2021 ◽  
Author(s):  
Apurba Das ◽  
Subhendu Pal ◽  
Gopal Agarwal ◽  
Kazuaki Inaba ◽  
Tripuresh Deb Singha ◽  
...  
Keyword(s):  
High Temperature ◽  
Outer Surface ◽  
High Speed ◽  
Operating Temperature ◽  
Functionally Graded ◽  
Low Velocity Impact ◽  
Potential Hazard ◽  
Low Velocity ◽  
Velocity Impact ◽  
Turbo Machinery

Abstract Turbo machinery rotating blades are a vital component of aero-engines for transferring the energy of gas flow to kinetic energy. Rotating turbo-machinery blades are prone to fail under working field with high temperature, high speed, high pressure and impact of blades. Recently Functionally graded materials (FGMs) are used in turbo-machinery blades due to its advantage of delamination and debonding free structure and ability to withstand high temperature during operation. As these aero-engine blade works in high temperature condition therefore use of ceramic FGM in the outer surface of the blades gives potential advantage. However, low velocity impact is a potential hazard of the blade due to rigid structure of the blade while considerable thickness of ceramic present in the outer surface of the blade. The chances of impact failure of the blade also increase in that case. Hence, low velocity impact of the turbo-machinery blades need to study carefully for safe and reliable operation of the engine. In this present work the low velocity impact characteristics of the FGM sandwich turbine blade under various operating temperature are determined using finite element technique. The low velocity impact performances are evaluated in terms of time histories of the contact force, velocity of the projectile, shell deflection and indentation considering various impactor initial velocities, core to FGM thickness ratio (hcore/hfgm) and blade operating temperature. The upper and lower surfaces of the functionally graded structure reinforced by ductile pure metal layers appear to play a significant role in protecting the structure’s functional integrity from damage.

Illustrating hybrid effect and damage evolution of carbon/aramid braided composite under low-velocity impact

2020 ◽  
Vol 245 ◽  
pp. 112372 ◽  
Author(s):  
Liwei Wu ◽  
Wei Wang ◽  
Qian Jiang ◽  
Jia-Horng Lin ◽  
Youhong Tang
Keyword(s):  
Damage Evolution ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Hybrid Effect ◽  
Velocity Impact ◽  
Braided Composite

On the low- and high-velocity impact behaviour of hybrid composite materials at room and extreme temperature

2021 ◽  
pp. 002199832110476
Author(s):  
Ilaria Papa ◽  
Federica Donadio ◽  
Vicente Sánchez Gálvez ◽  
Valentina Lopresto
Keyword(s):  
Hybrid Composite ◽  
High Velocity ◽  
Composite Laminates ◽  
Composite Structures ◽  
High Speed ◽  
Extreme Temperature ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
The Impact

A demand raised is how to improve the survivability of aircraft and naval structures concerning low- and high-velocity impacts. Since fundamental failure is due to mainly by fracture, a fundamental understanding of both mechanisms and mechanics of the material is crucial. It is important to understand the deformation and damage mechanisms involved in the impact to improve the design of composite structures. Several approaches have been exploited to improve the impact damage resistance of composite laminates in different conditions. Among these, the development of composite laminates stacking different fibres in the same matrix results very interestingly. This paper deals to investigate on the high and low speed impact performance of hybrid composite configurations made of glass/carbon and basalt fibres. Low-velocity impact at penetration and high speed tests at different impact velocity were carried out at the room and low temperatures to evaluate the goodness of hybridization proposed and the temperature effect on the composite performances. Among the three proposals, a hybrid basalt carbon configuration was identified as the best both at low speeds and at high impact speeds for both temperatures tested.

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