scholarly journals SIZE EFFECT OF MEMBERS ON FLEXURAL/TENSILE STRENGTH OF HARDENED HIGH-TOUGHNESS ECO-BINDER（HTEB）AND IMPACT RESISTANCE OF HTEB PANEL TO REPEATED DROP-WEIGHT IMPACT

2013 ◽  
Vol 67 (1) ◽  
pp. 595-602
Author(s):  
Makoto YAMAGUCHI ◽  
Kiyoshi MURAKAMI ◽  
Koji TAKEDA ◽  
Seiya SHIMODA
Keyword(s):  
Tensile Strength ◽  
Size Effect ◽  
Impact Resistance ◽  
High Toughness ◽  
Flexural Tensile Strength ◽  
Drop Weight ◽  
Weight Impact

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

scholarly journals The Choice of Recycling Methods for Single-Polymer Polyester Composites

2018 ◽  
Vol 55 (4) ◽  
pp. 658-665 ◽  
Author(s):  
Katarzyna Gawdzinska ◽  
Marcin Nabialek ◽  
Andrei Victor Sandu ◽  
Katarzyna Bryll
Keyword(s):  
Molecular Weight ◽  
Tensile Strength ◽  
Polymer Composites ◽  
Injection Moulding ◽  
Average Molecular Weight ◽  
Impact Resistance ◽  
Mass Fractions ◽  
Weight Impact ◽  
Polyester Composites ◽  
Work Done

This work has described the production of single-polymer composites by the film-stacking method. Two types of single-polymer composites with different mass fractions of the polyester reinforcement phase (10% and 20%) and the PETG matrix were investigated. The produced composites were subsequently recycled by injection moulding, pressing, and extrusion. Selected properties of the processed composites were determined: density, viscosity-average molecular weight, impact resistance, and tensile strength. The work done in this paper has demonstrated the benefits and drawbacks of each recycling method for these materials. The selected properties of single-polymer polyester composites and single-polymer polyester composites that were recycled by extrusion have also been compared.

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.

Recovery of impact-damaged carbon fiber–reinforced composites using induction heating

2021 ◽  
pp. 002199832110587
Author(s):  
Sultan M Bayazeid ◽  
Kim-Leng Poon ◽  
Balakrishnan Subeshan ◽  
Mohammed Alamir ◽  
Eylem Asmatulu
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Impact Test ◽  
Impact Damage ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Drop Weight ◽  
Carbon Fiber Reinforced Composites ◽  
Weight Impact ◽  
The Impact

Carbon fiber–reinforced composites (CFRCs) have been used extensively in structural applications within the aerospace and automotive manufacturing industries. However, several other applications have been recognized. These take advantage of the additional properties of CFRCs, which lead to providing better performance for structures. However, in their service environment, these CFRCs are inevitably susceptible to impact damage from multiple sources, and they must be able to recover from impacts to meet structural requirements. This study directs an experimental investigation of using induction heating (IH) for an impact-damaged CFRC. Here, IH process parameters, including the effects of electromagnetic frequency and generator power on the recovery of impact-damaged CFRC, have been analyzed. The anisotropic conductivity characteristics and the relationship between the drop-weight impact depth and conductivity of CFRC garnered much attention. This paper also offers the electromagnetic properties of CFRC for various applications. In this study, CFRC cured samples were obtained from Cetex® TC1200 PEEK, AS4 145 gsm, 16 unidirectional plies. Three variants of CFRC samples were tested: undamaged samples; samples with impact damage introduced in the center by a drop-weight impact test, according to the ASTM D7136/7136M standard; and samples with drop-weight impact damage recovered using the IH system. This work presents the results of the tensile strength of CFRC samples to assess the comparison of undamaged samples, samples damaged after the drop-weight impact test, and samples recovered after the drop-weight impact test. IH is appropriate for the recovery of impact-damaged CFRC samples, aiding in the conversion of electromagnetic energy to heat in order to generate mechanisms on components to recover the impact-damaged CFRC samples. Experimental results show that the impact-damaged area of the recovered CFRC samples is 37.0% less than that of damaged CFRC samples, and tensile strength results also improved after the impact-damaged CFRC samples were recovered. These results show that the IH method can effectively improve the impact damage performance of CFRC. The outcome of this study is promising for use in many applications, especially in the aerospace and automotive industries.

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.

scholarly journals Preparation, Performance Test, and Microstructure of Composite Modified Reinforced Concrete

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Shi Hu ◽  
Ying Xu
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Water Absorption ◽  
Absorption Rate ◽  
Impact Resistance ◽  
Polypropylene Fiber ◽  
Splitting Tensile Strength ◽  
Aggregate Concrete ◽  
Flexural Tensile Strength

To investigate whether the compound modification means which mixes modified Polyvinyl chloride (PVC) aggregate and polypropylene fiber in concrete could gain “positive hybrid effect” and cope with more sophisticated engineering circumstances, four groups of test specimens were prepared: concrete doped with unmodified PVC aggregate, concrete doped with modified PVC aggregate, concrete doped with unmodified PVC aggregate and polypropylene fiber, and concrete doped with modified PVC aggregate and polypropylene fiber. The fiber content is 0.9 kg/m3, the modified solution content is 1 mol/L NaOH, and the replacement amount of PVC fine aggregate in replacement sand is 0%, 5%, 10%, 20%, and 30%. Mechanical property and durability tests were carried out to compare and analyze the measured compressive strength, splitting tensile strength, flexural tensile strength, water absorption rate, and impact failure energy. Moreover, scanning electron microscopy and XRD diffraction were used to analyze micromorphology and crystal structure of concrete. The test results demonstrate that as the content of PVC aggregate increases, the compressive strength, splitting tensile strength, and flexural tensile strength of the concrete decrease significantly, while the brittleness is improved. Meanwhile, the water absorption rate increases and the impact resistance shows an approximately linear increase trend. Under the same content of PVC aggregate, the most effective way to improve compressive strength is to use modified PVC aggregate. The rapid decrease of compressive strength caused by PVC aggregate can be effectively delayed by doping polypropylene fiber and modified PVC aggregate. Adding polypropylene fiber or using the modified PVC aggregate can improve the brittleness, tensile strength, flexural tensile strength, and impact resistance, but they have different modification and reinforcement effects. The concrete prepared by doping polypropylene fiber and modified PVC aggregate has better performance in tensile strength, flexural tensile strength, brittleness, and impact resistance, and the water absorption and the compressive strength of the concrete are enhanced compared with the normal group. Therefore, composite modified reinforced concrete doped with modified PVC aggregate-polypropylene fiber has broad application prospects.

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