Evaluation of impact resistance properties of polyurethane-based polymer concrete for the repair of runway subjected to repeated drop-weight impact test

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.

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

Volume 2: Additive Manufacturing; Materials ◽

10.1115/msec2017-3061 ◽

2017 ◽

Cited By ~ 1

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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Impact Resistance of Blast Mitigation Material Using Modified ACI Drop-Weight Impact Test

ACI Materials Journal ◽

10.14359/51685668 ◽

2013 ◽

Vol 110 (3) ◽

Keyword(s):

Impact Test ◽

Impact Resistance ◽

Blast Mitigation ◽

Drop Weight ◽

Weight Impact

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Impact Test for the Leading Edge of CMC Vane Based on Actual Aircraft Engine Field Data

Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy ◽

10.1115/gt2018-76116 ◽

2018 ◽

Author(s):

Kenro Obuchi ◽

Fumiaki Watanabe ◽

Hiroshi Kuroki ◽

Hiroyuki Yagi ◽

Kazuyoshi Arai

Keyword(s):

Impact Test ◽

Impact Resistance ◽

Leading Edge ◽

Aircraft Engine ◽

Aircraft Engines ◽

Turbine Vanes ◽

Turbine Vane ◽

Nickel Based Alloy ◽

Weight Impact ◽

The Impact

Ceramic matrix composites (CMCs) have lower density and a higher service temperature limit than nickel based alloys which have been used for turbine components of aircraft engines. These properties of CMCs have the potential to reduce the weight of turbine components and improve turbine thermal efficiency with a higher turbine inlet temperature (TIT). One of the technical issues of the CMC turbine vane is a relatively lower impact resistance than nickel based alloy turbine vanes. There are various previous works about impact resistance of CMCs, but there is little work that assumed actual engine conditions. The objective of this work was to verify the resistance of SiC/SiC CMC turbine vane to the impact phenomena that occur in the actual aircraft engine. The field damage survey was conducted on actual metal turbine vanes of commercial engines overhauled in IHI. The survey made it clear that the typical damage was less-than-0.127-mm-dent at the leading edge. In addition, the dropped weight impact test using the actual turbine airfoil which is made from a nickel based alloy was conducted at ambient temperature. The amount of energy required to make the dent of a certain size that was observed in actual metal turbine vanes was estimated. Then, the dropped weight impact test using the CMC test piece with a leading edge shape was conducted at the impact energy estimated by the metal turbine airfoil. The results showed that the failure mode of the CMC test piece was local damage with dents of a certain size and not a catastrophic failure mode. From this work, the damage to be assumed on CMC vane in actual aircraft engines was identified. As a future task, the effect of the damage to the fatigue capability of CMC turbine vanes needs to be investigated.

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Sensitivity and Phase Transition of Heatedϵ-CL-20 in Drop-Weight Impact Test

Propellants Explosives Pyrotechnics ◽

10.1002/prep.201800173 ◽

2018 ◽

Vol 43 (11) ◽

pp. 1164-1170 ◽

Cited By ~ 4

Author(s):

Xue Zheng ◽

Shaojun Yu ◽

Wen Wen ◽

Yushi Wen ◽

Pei Wang ◽

...

Keyword(s):

Phase Transition ◽

Impact Test ◽

Drop Weight ◽

Weight Impact

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The effect of microwave pretreatment on impact crushing of lead-zinc ore

Metallurgical Research & Technology ◽

10.1051/metal/2021055 ◽

2021 ◽

Vol 118 (5) ◽

pp. 501

Author(s):

Yulong Liu ◽

Dexin Ding ◽

Wenguang Chen ◽

Nan Hu ◽

Lingling Wu ◽

...

Keyword(s):

Energy Input ◽

Impact Test ◽

Characteristic Parameters ◽

Microwave Pretreatment ◽

Drop Weight ◽

Lead Zinc ◽

Weight Impact ◽

Impact Crushing ◽

The Impact ◽

The Relationship

The relationship between energy input and particle size of ore samples after crushing and effect of microwave pretreatment on impact crushing of lead-zinc ore were studied by drop weight impact test. The results showed that the lead-zinc ore became softer and had higher degree of crushing after microwave pretreatment. Compared with continuous microwave pretreatment, pulsed microwave pretreatment could improve the drop weight impact crushing efficiency of lead-zinc ore. When the specific comminution energy were 5 kW h/t, 10 kW h/t respectively, the crushing characteristic parameters t10 were 60.42% and 67.46% respectively by continuous microwave. But the values of t10 were increased to 68.64% and 75.88% respectively after pulsed microwave radiation under same microwave power and time. In addition, water quenching could more promote the impact crushing efficiency of lead-zinc ore after microwave irradiation.

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