High Performance Cutting of Aerospace Materials

2012 ◽  
Vol 498 ◽  
pp. 127-132 ◽  
Author(s):  
A. Krämer ◽  
Dieter Lung ◽  
Fritz Klocke
Keyword(s):  
High Performance ◽  
Physical And Mechanical Properties ◽  
Cryogenic Cooling ◽  
Process Stability ◽  
Aerospace Materials ◽  
Manufacturing Costs ◽  
High Temperature Alloys ◽  
Cutting Ceramics ◽  
Nickel Based Alloy ◽  
Cutting Speeds

Titanium and nickel-based alloys belong to the group of difficult-to-cut materials. The machining of these high-temperature alloys is characterized by low productivity and low process stability as a result of their physical and mechanical properties. Major problems during the machining of these materials are low applicable cutting speeds due to excessive tool wear, long machining times, and thus high manufacturing costs, as well as the formation of ribbon and snarled chips. Under these conditions automation of the production process is limited. This paper deals with strategies to improve machinability of titanium and nickel-based alloys. Using the example of the nickel-based alloy Inconel 718 high performance cutting with advanced cutting materials, such as PCBN and cutting ceramics, is presented. Afterwards the influence of different cooling strategies, like high-pressure lubricoolant supply and cryogenic cooling, during machining of TiAl6V4 is shown.

scholarly journals Composites from Thermoplastic Natural Rubber Reinforced Rubberwood Sawdust: Effects of Sawdust Size and Content on Thermal, Physical, and Mechanical Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Chatree Homkhiew ◽  
Surasit Rawangwong ◽  
Worapong Boonchouytan ◽  
Wiriya Thongruang ◽  
Thanate Ratanawilai
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Natural Rubber ◽  
High Density Polyethylene ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
Modulus Of Rupture ◽  
Shore Hardness ◽  
Thermoplastic Natural Rubber ◽  
Plastic Content

The aim of this work is to investigate the effects of rubberwood sawdust (RWS) size and content as well as the ratio of natural rubber (NR)/high-density polyethylene (HDPE) blend on properties of RWS reinforced thermoplastic natural rubber (TPNR) composites. The addition of RWS about 30–50 wt% improved the modulus of the rupture and tensile strength of TPNR composites blending with NR/HDPE ratios of 60/40 and 50/50. TPNR composites reinforced with RWS 80 mesh yielded better tensile strength and modulus of rupture than the composites with RWS 40 mesh. The TPNR/RWS composites with larger HDPE content gave higher tensile, flexural, and Shore hardness properties and thermal stability as well as lower water absorption. The TPNR/RWS composites with larger plastic content were therefore suggested for applications requiring high performance of thermal, physical, and mechanical properties.

scholarly journals The Effect of the Morphology of Coarse Aggregate on the Properties of Self-Compacting High-Performance Fibre-Reinforced Concrete

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1372 ◽  
Author(s):  
Krzysztof Ostrowski ◽  
Łukasz Sadowski ◽  
Damian Stefaniuk ◽  
Daniel Wałach ◽  
Tomasz Gawenda ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Coarse Aggregate ◽  
Fresh Concrete ◽  
Physical And Mechanical Properties ◽  
Concrete Mixture ◽  
Rheological Parameters ◽  
Transverse Strain ◽  
Fibre Reinforced Concrete ◽  
High Performance Fibre

When understanding the effect of the morphology of coarse aggregate on the properties of a fresh concrete mixture, the strength and deformability of self-compacting high-performance fibre-reinforced concrete (SCHPFRC) can be seen to be critical for its performance. In this research, regular and irregular grains were separated from granite coarse aggregate. The morphology of these grains was described while using digital image analysis. As a result, the aspect ratio, roundness and area ratio were determined in order to better understand this phenomenon. Then, the principal rheological, physical, and mechanical properties of SCHPFRC were determined. The obtained results indicated that the morphology of the grains of coarse aggregate has an impact on the strength and stiffness properties of SCHPFRC. Moreover, significant differences in the transverse strain of concretes were observed. The morphology of the coarse aggregate also has an impact on the rheological parameters of a fresh concrete mixture. To better understand this phenomenon, the hypothesized mechanism of the formation of SCHPFRC caused by different morphology of coarse aggregate was proposed at the end of the article.

Powder Injection Molding of Ti-6Al-4V Alloy for Defect-Free High Performance Titanium Parts with Low Carbon/Oxygen Contents

2018 ◽  
Vol 770 ◽  
pp. 189-194
Author(s):  
Dong Guo Lin ◽  
Jae Man Park ◽  
Tae Gon Kang ◽  
Seong Taek Chung ◽  
Young Sam Kwon ◽  
...  
Keyword(s):  
Injection Molding ◽  
Alloy Powder ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Solid Loading ◽  
Injection Molding Process ◽  
Low Carbon ◽  
Molding Process

In this work, powder injection molding (PIM) of Ti-6Al-4V alloy powder has been studied. Defect-free high performance Ti-6Al-4V parts with low carbon/oxygen contents have been successfully prepared by PIM. A pre-alloyed Ti-6Al-4V alloy powder and wax-polymer binder system have been mixed together to prepare the feedstock. In mixing stage, the solid loading percentage and mixing conditions have been optimized. Rheological and thermal debinding behaviors of prepared feedstock have been characterized and numerically expressed based on rheometry and thermal gravity experimental results. In addition, the injection molding process of Ti-6Al-4V parts has been numerically analyzed to optimize the injection molding conditions. Consequently, the defect-free Ti-6Al-4V parts with low carbon and oxygen contents have been successfully fabricated by PIM, which exhibits excellent physical and mechanical properties.

Physical and Mechanical Properties of High Performance Concrete with Alum Sludge as Partial Cement Replacement

2013 ◽  
Vol 65 (2) ◽  
Author(s):  
Haider Mohammed Owaid ◽  
Roszilah Hamid ◽  
Siti Rozaimah Sheikh Abdullah ◽  
Noorhisham Tan Kofli ◽  
Mohd Raihan Taha
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Physical And Mechanical Properties ◽  
Cement Replacement ◽  
Alum Sludge ◽  
Partial Cement Replacement

High Performance Spindle Systems for Heavy Duty Milling of Difficult-To-Cut Aerospace Materials

2012 ◽  
Vol 6 (1) ◽  
pp. 43-56
Author(s):  
Masakazu Soshi ◽  
Shinji Ishii ◽  
Peter Fonda ◽  
Kazuo Yamazaki
Keyword(s):  
High Performance ◽  
Heavy Duty ◽  
Aerospace Materials

Damage Behaviour of Fibre Reinforced Materials Induced by High Temperature Oxidation for Optimisation of Thermal Recycling Routes

2015 ◽  
Vol 825-826 ◽  
pp. 1088-1095 ◽  
Author(s):  
Frank Manis ◽  
Jakob Wölling ◽  
Klaus Drechsler
Keyword(s):  
Statistical Analysis ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Carbon Fibres ◽  
Temperature Oxidation ◽  
Secondary Use ◽  
Reinforced Plastic ◽  
Structural Applications ◽  
Definition Of

This study summarizes different characterisation methods performed with new carbon fibres(vCF - virgin carbon fibres) for structural applications as carbon fiber reinforced plastic (CFRP)as well as fiber samples which have been treated under different conditions. These parameters consistof combinations of temperature (400-600 C) and dwell time (30 - 60 min) in an oxidising atmospherein order to provide a fundamental basis for the definition of possible recycling processes to regain thehigh value raw material, i.e. the carbon fibre, after the use-phase of the initial CFRP-structure. The investigationsthat were performed on vCF and secondary fibres (rCF - recycled CF) show in very goodagreement, that below 500 C almost no degradation of the fibre is visible, between 500 and 600 C arapid decrease in different physical and mechanical properties occurs and above 600 C a recovery ofthe fiber in terms of a secondary use in high performance structural context seems not to be feasible.The investigations that were performed consist of optical microscopy for the measurement of the fibrediameter, the deformation of the cross section and a statistical analysis. The second method appliedwas the characterization of the monofilament density, alongside to the breaking force and elongation,leading to the calculation of tensile strength and Youngs Modulus and further statistical analysis ofWeibull Modulus and its decrease over temperature.

Design of Experiment (DOE) of Powder Metallurgy Technique in Fabricating SnCu/Carbon Lead-Free Composite Solder with Different Mixing Parameters

2014 ◽  
Vol 803 ◽  
pp. 269-272
Author(s):  
Sayyidah Amnah Musa ◽  
Norainiza Saud
Keyword(s):  
Powder Metallurgy ◽  
High Performance ◽  
Composite Solder ◽  
Mixing Time ◽  
Physical And Mechanical Properties ◽  
Optical Microscope ◽  
Lead Free ◽  
Lead Free Solder ◽  
Best Parameter ◽  
Free Solder

Physical and mechanical properties of a solder joint will be improved by adding the high performance of reinforcement particulates in the monolithic lead-free solder. In this study, 0.1wt% of activated carbon (AC) was added into Sn-0.7Cu lead-free solder which fabricated via powder metallurgy (PM) techniques. Various parameters used in PM technique such as mixing time, compacting load and sintering temperature has been carried out in fabricating the composite solder. In this study, the best mixing time has been optimized. The distribution of carbon in SnCu matrix for each mixing time was observed by using optical microscope. Microstructural observation showed that the increasing in mixing time has increased the number of AC particles to become agglomerated. It is found out that 1hour of mixing time is the best parameter to fabricate SnCu/AC composite solder via powder metallurgy route since the distribution of reinforcement particles has distributed uniformly at the grain boundaries without any agglomeration.

Influence of Recycled Aggregate on Physical and Mechanical Properties of High Performance Recycled Aggregate Concrete

2011 ◽  
Vol 460-461 ◽  
pp. 764-767 ◽  
Author(s):  
Yi Dong Xu ◽  
Jia Ying Sun
Keyword(s):  
High Performance ◽  
Physical And Mechanical Properties ◽  
Chloride Ion ◽  
Poor Quality ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Ion Permeability ◽  
Negative Effects ◽  
Aggregate Concrete ◽  
Positive Effects

Influence of recycled aggregate on slump, compressive strength and chloride ion permeability of recycled aggregate concrete was investigated. As is shown by the results, although recycled aggregate belongs to the category of poor quality aggregate, the properties of high performance recycled aggregate concrete are not reduced dramatically with the increasing amount of recycled aggregate, for recycled aggregate have both positive effects and negative effects on the properties of recycled aggregate concrete. The high performance recycled aggregate concrete can be developed by double-mixture of ultra fine fly ash and superplasticizer.

Elastic Constants of Single Crystal Hastelloy X at Elevated Temperatures

1998 ◽  
Vol 120 (3) ◽  
pp. 242-247 ◽  
Author(s):  
Howard A. Canistraro ◽  
Eric H. Jordan ◽  
Shi Shixiang ◽  
Leroy H. Favrow ◽  
Francis A. Reed
Keyword(s):  
Single Crystal ◽  
Elastic Constants ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Mechanical Response ◽  
Aerospace Materials ◽  
Hastelloy X ◽  
Percent Change ◽  
Nickel Based Alloy ◽  
Individual Grains

An acoustic time of flight technique is described in detail for measuring the elastic constants of cubic single crystals that allows for the constants to be determined at elevated temperature. Although the overall technique is not new, various aspects of the present work may prove extremely useful to othersinterested in finding these values, especially for aerospace materials applications. Elastic constants were determined for the nickel based alloy, Hastelloy X from room temperature to 1000°C. Accurate elastic constants were needed as part of an effort to predict both polycrystal mechanical properties and the nature of grain induced heterogeneous mechanical response. The increased accuracy of the acoustically determined constants resulted in up to a 15 percent change in the predicted stresses in individual grains. These results indicate that the use of elastic single crystal constants of pure nickel as an approximation for the constants of gas turbine single crystal alloys, which is often done today, is inaccurate.

scholarly journals Corrosion Characterization of Iron-Based High-Performance Amorphous-Metal Thermal-Spray Coatings

2005 ◽  
Author(s):  
J. C. Farmer ◽  
J. J. Haslam ◽  
S. D. Day ◽  
D. J. Branagan ◽  
C. A. Blue ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Thermal Spray ◽  
High Performance ◽  
Thermal Spray Technology ◽  
Published Data ◽  
Corrosion Resistant ◽  
Spray Coatings ◽  
Nickel Based Alloy ◽  
Iron Based

New corrosion-resistant, iron-based amorphous metals have been identified from published data or developed through combinatorial synthesis, and tested to determine their relative corrosion resistance. Many of these materials can be applied as coatings with advanced thermal spray technology. Two compositions have corrosion resistance superior to wrought nickel-based Alloy C-22 (UNS # N06022) in some very aggressive environments, including concentrated calcium-chloride brines at elevated temperature. One of these compositions, SAM1651, is discussed in detail to illustrate the promise of this general class of materials.

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