scholarly journals Shielding Effectiveness and Impact Resistance of Concrete Walls Strengthened by High-Strength High-Ductility Concrete

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7773
Author(s):  
Jae-Hoon Lee ◽  
Jin-Seok Choi ◽  
Tian-Feng Yuan ◽  
Young-Soo Yoon
Keyword(s):  
Impact Resistance ◽  
High Strength ◽  
Area Ratio ◽  
Structural Performance ◽  
High Ductility ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Concrete Walls ◽  
Drop Weight ◽  
Weight Impact

Following the fourth Industrial Revolution, electronic and data-based technology is becoming increasingly developed. However, current research on enhancing electromagnetic interference (EMI) shielding and the physical protection performance of structures incorporating these technologies is insufficient. Therefore, in this study aiming for the improvement of EMI shielding and structural performance of structures, twelve concrete walls were fabricated and tested to determine their shielding effectiveness and drop-weight impact resistance. Concrete walls strengthened by three thickness types of high-strength, high-ductility concrete (HSDC) have been considered. The test results showed that the shielding effectiveness with strengthening thickness increased by approximately 35.6–46.2%. Specimens strengthened by more than 40% and 10% of the strengthening area ratio of single- and double-layer, respectively, exhibited more than 20 dB of shielding effectiveness. Moreover, the relationship between the damaged area ratio and shielding effectiveness was evaluated by means of the drop-weight impact test. The structural performance and EMI shielding effectiveness improved as the HSDC thickness increased.

Impact resistance of high strength-high ductility concrete

2017 ◽  
Vol 98 ◽  
pp. 24-35 ◽  
Author(s):  
Ravi Ranade ◽  
Victor C. Li ◽  
William F. Heard ◽  
Brett A. Williams
Keyword(s):  
Impact Resistance ◽  
High Strength ◽  
High Ductility

scholarly journals Experimental Investigation on the Impact Resistance of Carbon Fibers Reinforced Coral Concrete

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4000 ◽  
Author(s):  
Bing Liu ◽  
Jingkai Zhou ◽  
Xiaoyan Wen ◽  
Jianhua Guo ◽  
Xuanyu Zhang ◽  
...  
Keyword(s):  
Weibull Distribution ◽  
Carbon Fibers ◽  
Impact Test ◽  
Concrete Strength ◽  
Impact Resistance ◽  
Initial Crack ◽  
Drop Weight ◽  
Weight Impact ◽  
The Impact ◽  
Two Parameter

In this study, the impact resistance of coral concrete with different carbon fiber (CF) dosages subjected to drop-weight impact test was investigated. For this purpose, three concrete strength grades (C20, C30, C40) and six CF dosages (0.0%, 0.3%, 0.6%, 1.0%, 1.5%, and 2.0% by weight of the binder) were considered, and a total of 18 groups of carbon fibers reinforced coral concrete (CFRCC) were cast. For each group, eight specimens were tested following the drop-weight impact test suggested by CECS 13. Then, the two-parameter Weibull distribution theory was adopted to statistically analyze the variations in experimental results. The results indicated that the addition of CFs could transform the failure pattern from obvious brittleness to relatively good ductility and improve the impact resistance of coral concrete. Moreover, the impact resistance of CFRCC increases with the CF dosage increasing. The statistical analysis showed that the probability distribution of the blow numbers at the initial crack and final failure of CFRCC approximately follows the two-parameter Weibull distribution.

scholarly journals Drop Weight Impact Resistance of Glass/Plastics Laminate.

Seikei-Kakou ◽  
1998 ◽  
Vol 10 (6) ◽  
pp. 381-388
Author(s):  
Hiroshi Kataoka ◽  
Tamotsu Tonegawa
Keyword(s):  
Impact Resistance ◽  
Drop Weight ◽  
Weight Impact

Dynamic Response of 3D-Printed Bi-Material Structure Using Drop Weight Impact Test

2017 ◽  
Author(s):  
Anish Ravindra Amin ◽  
Yi-Tang Kao ◽  
Bruce L. Tai ◽  
Jyhwen Wang
Keyword(s):  
Energy Absorption ◽  
Impact Test ◽  
Impact Resistance ◽  
Silicone Elastomer ◽  
Material Structure ◽  
Pu Foam ◽  
Drop Weight ◽  
3D Printed ◽  
Weight Impact ◽  
The Impact

Additive manufacturing has led to increasing number of applications that require complex geometries and multiple materials. This paper presented a bi-material structure (BMS) composed of a cushion matrix held by a 3D printed frame structure for an improved impact resistance. The study mainly focused on understanding the effects of structural topology and matrix material. Two matrix materials, silicone elastomer and polyurethane (PU) foam, were selected to impregnate into two different PLA frame structures. Drop weight impact test was carried out to measure the impact force and energy absorption. The results showed that the overall impact resistance was dominated by the frame, while the matrix reinforcement required proper structural interlocking mechanism and material matching. In the particular specimens of this study, PU foam led to more energy absorption and force bearing capacity of the structure than the silicone elastomer.

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