Influence of Material System, Lay-Up and Thickness on the Energy Absorption Capability of Composite Laminates

2006 ◽  
Author(s):  
Stefano Mian ◽  
Marino Quaresimin ◽  
Stefano Magistrali
Keyword(s):  
Energy Absorption ◽  
Composite Laminates ◽  
Energy Levels ◽  
Low Velocity Impact ◽  
Design Parameters ◽  
Material System ◽  
Low Velocity ◽  
Glass Carbon ◽  
Laminate Thickness ◽  
Key Parameter

The paper presents the results of an experimental campaign devoted to investigate energy absorption during impact and its dependence on some relevant design parameters, such as material system, laminate thickness and laminate lay-up. Three different material systems were investigated, carbon/epoxy, kevlar/epoxy and glass/epoxy, and four stacking sequences [0]8, [0/45]2s, [0]12 and [0/45]3s. A total of 11 different configurations were considered, including a hybrid glass-carbon-kevlar/epoxy laminate. Low velocity impact tests were carried out on flat samples at several energy levels from barely visible damage up to penetration, according to ASTM 5628 standard. The penetration energy is pointed out as a key-parameter in determining the absorption capability of a laminate.

scholarly journals Impact Analysis of Carbon/Glass/Epoxy Hybrid Composite Pipes

2019 ◽  
Vol 8 (4) ◽  
pp. 6002-6006
Keyword(s):  
Energy Absorption ◽  
Impact Analysis ◽  
Energy Levels ◽  
Maximum Load ◽  
Low Velocity Impact ◽  
Internal Diameter ◽  
Low Velocity ◽  
Glass Carbon ◽  
Composite Pipes ◽  
The Impact

Filament winded composite pipes are used in various environments conditions for different applications. In this study filament winded hybrid (Glass/Carbon/Epoxy) composite pipes with interwoven (CG90/CG60) orientation were tested under various low velocity impact conditions for two different thickness. Internal diameter as 50 mm with various thicknesses such as 4 mm, 6mm are used to study the effect of impact. The impact test conducted at three different energy levels as 20 J, 25 J and 30 J. Effect of impact on these pipes were measured by the comparison of energy absorption, force and deformation values. The results shows that increasing thickness of specimens increase maximum load carrying capacity and reduces the energy absorption and deformation of impacted specimens

Delamination Threshold Load of Composite Laminates under Low-Velocity Impact

2012 ◽  
Vol 525-526 ◽  
pp. 521-524
Author(s):  
Y.G. Xu ◽  
Z. Shen ◽  
W. Tiu ◽  
Y.Z. Xu ◽  
Yong K. Chen ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Composite Laminates ◽  
Impact Damage ◽  
Energy Levels ◽  
Low Velocity Impact ◽  
Thickness Effect ◽  
Low Velocity ◽  
Velocity Impact ◽  
Key Factor ◽  
Laminate Thickness

A key factor affecting the use of carbon fibre reinforced composite laminates is the low velocity impact damage which may be introduced accidentally during manufacture, operation or maintenance of the component. Among the several barely visible impact damages, interlaminar delamination is the dominant failure mode and may reduce the post-impact compressive strength of the component significantly. This paper focuses on the study of the delamination threshold load (DTL) above which significant increase of delamination and thus large reduction of the residual compressive strength of the component may occur. Instrumented drop weight tests were carried out under various impact energy levels to determine the delamination threshold load. Efforts are directed to the study of the laminate thickness effect on the reliability of the detection of the DTL. The validity of the concept of DTL has been investigated and possible implications on the measurement of the DTL has been discussed. It is demonstrated that DTL exists but its detection requires proper testing conditions.

Failure Analysis of CCF300/5428 Laminates under Low Velocity Impact Based on Properties of Advanced Composite Material

2013 ◽  
Vol 387 ◽  
pp. 185-188
Author(s):  
Jian Yu Zhang ◽  
Ming Li ◽  
Li Bin Zhao ◽  
Bin Jun Fei
Keyword(s):  
Failure Analysis ◽  
Composite Laminates ◽  
Damage Model ◽  
Failure Criteria ◽  
Low Velocity Impact ◽  
Material System ◽  
Low Velocity ◽  
3D Fem ◽  
Velocity Impact ◽  
The Impact

A progressive damage model (PDM) composed by 3D FEM, Hashin and Ye failure criteria and Changs degradation rules was established to deeply understand the failure of a new material system CCF300/5428 under low velocity impact. User defined subroutines were developed and embedded into the general FEA software package to carry out the failure analysis. Numerical simulations provide more information about the failure of composite laminates under low velocity impact, including initial damage status, damage propagation and final failure status. The history of the impact point displacement and various damage patterns were detailed studied.

scholarly journals Analysis on the impact response of fiber-reinforced composite laminates: an emphasis on the FEM simulation

2019 ◽  
Vol 26 (1) ◽  
pp. 1-11
Author(s):  
Jian He ◽  
Liang He ◽  
Bin Yang
Keyword(s):  
Energy Absorption ◽  
Impact Energy ◽  
Composite Laminates ◽  
Mechanical Response ◽  
Adhesive Layer ◽  
Laminated Plates ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Damage Area ◽  
The Impact

AbstractThe effects of units, material parameters, and constitutive relationships on the dynamic mechanical response of composite laminates subjected to high- and low-velocity impacts were investigated. Additionally, the role of impact or shape, including hemispherical, flat, and conical, on the damage area of the adhesive layer and displacement of the center of the laminated plates was investigated. The results show that the energy absorption of composite laminates increases with impact velocity, and specific energy absorption changes with the density of the contact surface, which is affected by ply thickness. Moreover, the target energy absorption decreases with increasing layer angle. Under a low-velocity impact, the maximum contact force, damage area of the adhesive layer, and displacement of the center of the laminated plate increase as the impact energy increases, thus showing that impact energy is not directly related to contact duration and energy absorption of composite laminates. The results of different geometric shapes show that the damage area of the adhesive layer and the displacement of the center of the laminated plates are largest for a conical impactor and smallest for a flat impactor.

Bridging the low-velocity impact energy versus impact damage and residual compression strength for composite laminates

2020 ◽  
pp. 073168442097064
Author(s):  
Di Zhang ◽  
Xitao Zheng ◽  
Jin Zhou ◽  
Wenxuan Zhang
Keyword(s):  
Impact Energy ◽  
Composite Laminates ◽  
Damage Model ◽  
Low Velocity Impact ◽  
Fe Model ◽  
Material System ◽  
Cohesive Elements ◽  
Low Velocity ◽  
Velocity Impact ◽  
Damage Area

A finite element (FE) model based on fiber kinking and a transversal fracture angle damage model with cohesive elements are proposed to simulate the low-velocity impact (LVI) and compression after impact (CAI), and build a relationship between LVI energy and CAI strength of composites. The proposed FE model is validated by a comprehensive experimental work conducted using a high strength carbon fiber/epoxy material system i.e. CCF300/BA9916II and underwent LVI and CAI experimentation.  The relative errors between numerical and experimental results of LVI damage area, maximum impact force, impact time, as well as CAI strength are less than 5%. The FE analysis results of LVI show that the dominant damage mode is delamination, and the CAI results demonstrate a brittle behavior with almost no loss of stiffness before failure. It is further deduced that the relationship of LVI energy and damage induced is directly proportional initially; however, after a threshold level of impact energy, the curve turns horizontal so that the increase in further impact energy does not increase the damage area substantially. A similar relationship is developed between impact energy and CAI strength.

Low Velocity Impact of Carbon/Zylon and Carbon/Kevlar Composite Laminates

Materials ◽  
2005 ◽  
Author(s):  
Kamaldeen Yusuff ◽  
Mohammad Mahinfalah ◽  
Amin Salehi-Khojin ◽  
Mohammad Alimi
Keyword(s):  
Carbon Fiber ◽  
Composite Laminates ◽  
Energy Levels ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Low Modulus ◽  
Side Face ◽  
Impact Side ◽  
The Impact

The response of composite laminates to low velocity impact at different energy levels for carbon fiber, carbon/Zylon and carbon/Kevlar composites were investigated in this study. The samples consisted of impact-side face sheet having different combination of 8-layer carbon, 6-layer carbon/2-layer Zylon and 6-layer carbon/2-layer Kevlar laminates. Tests were conducted at energy levels of 8J, 15J, 25J, and 50J. The aim of this study was to investigate the impact of adding a high modulus fiber or low modulus fiber to carbon fiber with respect to Low velocity impact at different energy levels. Results and overall conclusions for each of the composite laminates are presented in detail.

Effect of Temperature on Impact Properties of Hybrid Fiberglass/Kevlar Laminate Composites

2005 ◽  
Author(s):  
Amin Salehi-Khojin ◽  
Reza Bashirzadeh ◽  
Mohammad Mahinfalah ◽  
Reza Nakhaie Jazar
Keyword(s):  
Composite Laminates ◽  
Energy Levels ◽  
Maximum Energy ◽  
Low Velocity Impact ◽  
Effect Of Temperature ◽  
Low Velocity ◽  
Laminate Composites ◽  
Impact Performance ◽  
Compression After Impact ◽  
Maximum Impact Force

This paper demonstrates results of an experimental study on Kevlar/fiberglass composite laminates subjected to impact loading at variable temperatures. The effect of temperature on maximum energy, maximum impact force, and compression after impact was studied at several low velocity impact energy levels (8J, 15J, 25J). The temperatures considered were in the range of −50C to 120C. Results indicated that impact performance of these composites was affected over the range of temperature considered. Testing at ambient temperature is not fully sufficient and therefore additional testing must be performed for full understanding of composite laminate properties.

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