The Experts below are selected from a list of 10686 Experts worldwide ranked by ideXlab platform
Xi Chen - One of the best experts on this subject based on the ideXlab platform.
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contact Fracture mechanism of electroplated ni p coating upon stainless steel substrate
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: Akio Yonezu, Michihiro Niwa, Xi ChenAbstract:Abstract The contact Fracture Property and mechanism of electroplated Ni–P coating on stainless steel substrate were investigated using ball indentation testing, through a comprehensive experimental and numerical approach. First, the elastoplastic properties of both coating and substrate were evaluated using micro-indentation tests. Next, ball indentation test with large contact force was performed, such that the brittle coating on ductile substrate suffers from cracks, including ring crack (propagates circumferentially) and radial cracks (propagates radially), owing to the coating bending effect. The Fracture nucleation process was investigated using the acoustic emission technique (AET). In addition, finite element method (FEM) with cohesive zone model (CZM) was carried out to compute stress field and simulate crack initiation around the impression during the test. By using the comprehensive experimental/computational framework, the nucleation process (mechanism) of such a complicate crack system was clarified. The present technique and Fracture mechanism may be applicable to the analysis of structural integrity of other brittle coatings.
A J Kinloch - One of the best experts on this subject based on the ideXlab platform.
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modelling of the toughening mechanisms in rubber modified epoxy polymers part ii a quantitative description of the microstructure Fracture Property relationships
Journal of Materials Science, 1992Co-Authors: Y Huang, A J KinlochAbstract:A mathematical model has been developed to quantify the relationships between the microstructure and Fracture properties of multiphase rubber-toughened epoxy polymers. Good agreement between predictions from the model and experimental results have been found. The model also reveals that localized plastic shear banding in the epoxy matrix, running between the rubbery particles, is the dominating mechanism under all testing conditions
Srinivas F Chitragar - One of the best experts on this subject based on the ideXlab platform.
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laboratory performance of recycled asphalt mixes containing wax and chemical based warm mix additives using semi circular bending and tensile strength ratio tests
Construction and Building Materials, 2018Co-Authors: Dharamveer Singh, Prabin Kumar Ashish, Srinivas F ChitragarAbstract:Abstract Durability and sustainability are two major requirements of the asphaltic pavement structure. Durability aspect may involve performance parameters such as Fracture Property, moisture sensitivity etc., whereas, sustainability aspect may involve utilization of Recycled Asphalt Pavement (RAP) and Warm Mix Additive (WMA) in the conventional asphaltic mixture. Though improvement in high temperature performance may be expected with the addition of RAP due to its stiffer nature, it may degrade intermediate temperature performance. Additionally, RAP utilization may also increase the mixing and compaction temperature during the construction phase. Therefore, researchers have recommended using different WMA additives to decrease production temperature of mixes containing RAP. Though the use of WMA additives with RAP may decrease mixing and compaction temperature, their effects on various performance parameters of the asphaltic mixture must be evaluated. Sufficient research works have been reported on the performance of RAP and WMA mixes at high temperature, however, so far, limited work is available on understanding effects of RAP and WMA additives on fatigue and moisture sensitivity of asphalt mixture. Therefore, the present research work aimed at evaluating intermediate temperature Fracture properties and moisture sensitivity of asphaltic mixture containing RAP and WMA. Five different RAP contents (0%, 10%, 20%, 30%, and 40%), two different types of WMA additives (2% wax based “Sasobit” and 0.5% chemical based “Evotherm”) and one without WMA additive (Control mixture) were considered. Fracture properties of different asphaltic mixture combinations were evaluated using Semi Circular Bending (SCB) test. Improvement in Fracture Property of Control mixture was observed with increase in RAP content, however, the addition of wax based and chemical based WMA additives showed an overall reduction in Fractured resistance. Further, the asphaltic mixture containing wax based WMA additive showed better Fracture performance compared to the corresponding mixture containing chemical based WMA additive. Similarly, moisture sensitivity of asphaltic mixtures was evaluated using Tensile Strength Ratio (TSR) approach. Addition of both WMA additives resulted in lowered Indirect Tensile Strength (ITS) under dry as well as wet condition. Though the addition of WMA additive showed a negative impact on moisture sensitivity, all mixture considered in the present research work passed the minimum TSR requirement. Therefore, wax and chemical based WMA additive may deem acceptable from moisture sensitivity point of view.
Dharamveer Singh - One of the best experts on this subject based on the ideXlab platform.
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effect of warm mix additives and lime on intermediate temperature Fracture Property of ret and ppa modified asphalt binder
Journal of Materials in Civil Engineering, 2019Co-Authors: Dharamveer Singh, Prabin Kumar Ashish, Subhash Chander, Ayyanna Habal, Aniket V KatawareAbstract:AbstractAsphalt binder phase plays a significant role in cracking resistance of asphaltic mixture. Therefore, selection of appropriate asphalt binder combination becomes important, especially when ...
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laboratory performance of recycled asphalt mixes containing wax and chemical based warm mix additives using semi circular bending and tensile strength ratio tests
Construction and Building Materials, 2018Co-Authors: Dharamveer Singh, Prabin Kumar Ashish, Srinivas F ChitragarAbstract:Abstract Durability and sustainability are two major requirements of the asphaltic pavement structure. Durability aspect may involve performance parameters such as Fracture Property, moisture sensitivity etc., whereas, sustainability aspect may involve utilization of Recycled Asphalt Pavement (RAP) and Warm Mix Additive (WMA) in the conventional asphaltic mixture. Though improvement in high temperature performance may be expected with the addition of RAP due to its stiffer nature, it may degrade intermediate temperature performance. Additionally, RAP utilization may also increase the mixing and compaction temperature during the construction phase. Therefore, researchers have recommended using different WMA additives to decrease production temperature of mixes containing RAP. Though the use of WMA additives with RAP may decrease mixing and compaction temperature, their effects on various performance parameters of the asphaltic mixture must be evaluated. Sufficient research works have been reported on the performance of RAP and WMA mixes at high temperature, however, so far, limited work is available on understanding effects of RAP and WMA additives on fatigue and moisture sensitivity of asphalt mixture. Therefore, the present research work aimed at evaluating intermediate temperature Fracture properties and moisture sensitivity of asphaltic mixture containing RAP and WMA. Five different RAP contents (0%, 10%, 20%, 30%, and 40%), two different types of WMA additives (2% wax based “Sasobit” and 0.5% chemical based “Evotherm”) and one without WMA additive (Control mixture) were considered. Fracture properties of different asphaltic mixture combinations were evaluated using Semi Circular Bending (SCB) test. Improvement in Fracture Property of Control mixture was observed with increase in RAP content, however, the addition of wax based and chemical based WMA additives showed an overall reduction in Fractured resistance. Further, the asphaltic mixture containing wax based WMA additive showed better Fracture performance compared to the corresponding mixture containing chemical based WMA additive. Similarly, moisture sensitivity of asphaltic mixtures was evaluated using Tensile Strength Ratio (TSR) approach. Addition of both WMA additives resulted in lowered Indirect Tensile Strength (ITS) under dry as well as wet condition. Though the addition of WMA additive showed a negative impact on moisture sensitivity, all mixture considered in the present research work passed the minimum TSR requirement. Therefore, wax and chemical based WMA additive may deem acceptable from moisture sensitivity point of view.
Y Huang - One of the best experts on this subject based on the ideXlab platform.
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modelling of the toughening mechanisms in rubber modified epoxy polymers part ii a quantitative description of the microstructure Fracture Property relationships
Journal of Materials Science, 1992Co-Authors: Y Huang, A J KinlochAbstract:A mathematical model has been developed to quantify the relationships between the microstructure and Fracture properties of multiphase rubber-toughened epoxy polymers. Good agreement between predictions from the model and experimental results have been found. The model also reveals that localized plastic shear banding in the epoxy matrix, running between the rubbery particles, is the dominating mechanism under all testing conditions
