Bio-inspired vs. conventional sandwich beams: A low-velocity repeated impact behavior exploration

2018 ◽  
Vol 169 ◽  
pp. 193-204 ◽  
Author(s):  
S.H. Abo Sabah ◽  
A.B.H. Kueh ◽  
M.Y. Al-Fasih
Keyword(s):  
Impact Behavior ◽  
Sandwich Beams ◽  
Low Velocity ◽  
Repeated Impact

Evaluation of Cumulative Damage of RC Members under Repeated Impact Loading

2015 ◽  
Vol 784 ◽  
pp. 500-507 ◽  
Author(s):  
Hiroki Tamai ◽  
Yoshimi Sonoda
Keyword(s):  
Impact Loading ◽  
Structural Engineering ◽  
Damage Mechanics ◽  
Continuum Damage Mechanics ◽  
Numerical Approach ◽  
Cumulative Damage ◽  
Impact Behavior ◽  
Low Velocity ◽  
Repeated Impact ◽  
Applicability Limit

In the civil and structural engineering field, there are so many problems regarding act of impact loading against some structures due to natural disaster. So it is important to evaluate the damage condition of them after impact loading, and to estimate the residual performance of them. This study is focused on a reinforced concrete (herein after called RC) structure such as caisson breakwater and rock-shed. In order to quantitatively evaluate the dynamic behavior and cumulative damage of RC members under low-velocity single and repeated impact loading, we conducted numerical approach by using the theory of Continuum Damage Mechanics (herein after called CDM). At the result, we clarified not only impact behavior of the members but also the relationship between cumulative kinetic energy of repeated impact loading and cumulative damage of the members. In addition, applicability limit of our model based on scalar damage modeling was clarified.

Impact Behavior of Sandwich Beams With Various Composite Facesheets and Balsa Wood Core

2001 ◽  
Author(s):  
J. L. Abot ◽  
A. Yasmin ◽  
I. M. Daniel
Keyword(s):  
Impact Loading ◽  
Woven Fabric ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Sandwich Beams ◽  
Low Velocity ◽  
Balsa Wood ◽  
Composite Sandwich ◽  
Fabric Composite ◽  
Comprehensive Study

Abstract This study presents a combined experimental and theoretical analysis of both unidirectional and woven fabric composite sandwich beams under low velocity impact loading. The sandwich beams were fabricated by bonding carbon/epoxy facesheets to a balsa wood core. All constituent materials including facesheets, cores and adhesives were fully characterized separately under stress conditions similar to those encountered in the sandwich structures. A comprehensive study that includes fabrication, mechanical testing and analysis of these structures under both quasi-static and impact loading was performed. The failure mechanisms were also analyzed. Existing models developed by the authors for sandwich beams with PVC foam cores were extended to predict impact loads for sandwich beams with balsa wood core.

Quasi-static and low-velocity impact behavior of the bio-inspired hybrid Al/GFRP sandwich tube with hierarchical core: Experimental and numerical investigation

2021 ◽  
Vol 276 ◽  
pp. 114567
Author(s):  
Amirreza Tarafdar ◽  
Gholamhossein Liaghat ◽  
Hamed Ahmadi ◽  
Omid Razmkhah ◽  
Sahand Chitsaz Charandabi ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Low Velocity ◽  
Velocity Impact

scholarly journals Low velocity drop weight impact behavior of Al2O3-Ni-ZrO2 and Al2O3-Ni-Cr2O3 nanocomposite systems

2021 ◽  
Author(s):  
Betül Kafkaslıoğlu Yıldız ◽  
Murat Büyük ◽  
Yahya Kemal Tür
Keyword(s):  
Network Formation ◽  
Low Energy ◽  
Impact Behavior ◽  
Precipitation Method ◽  
Low Velocity ◽  
Ballistic Performance ◽  
Crack Network ◽  
Damage Mechanisms ◽  
Drop Weight ◽  
Weight Impact

Abstract 1 vol% Ni particulate Al2O3 matrix nanocomposites prepared by the heterogeneous precipitation method with ZrO2 (5 vol%) or Cr2O3 (1 vol%) additives were subjected to the low energy drop weight impact tests to compare the behavior of the compositions under low energy impact and to investigate the damage mechanisms. The pure Al2O3, Al2O3/Ni, Al2O3/ZrO2, and Al2O3/Cr2O3 compositions with the same additive ratios were also produced to make the comparison systematically. Also, the Vickers hardness measurements were carried out and a significant increase in hardness was attained for both Al2O3/Ni + ZrO2 and Al2O3/Ni + Cr2O3. The average hardness value around 24.8 ± 1.0 GPa was measured for Al2O3/Ni + ZrO2 and Al2O3/Ni + Cr2O3 which means ∼ 15% improvement compared to the pure Al2O3. Between all the compositions, the maximum force (Fmax) value was obtained for Al2O3/Ni + ZrO2 for 12 J impact energy level (26617 N) according to the low energy drop weight impact test results. Tensile radial crack network formation, cone formation, fracture and crushing of the cone structure were observed as damage mechanisms for all the compositions. The volume of conical frustum structure was evaluated for each composition and the effect of microstructure on possible ballistic performance was also discussed.

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