Questions related to Material Characteristics
I am quite confused. I know that parallel planes do have the same Miller indices. However, as you can see from the attached XRD pattern, there is (003) family of planes having different Miller indices. Why so? What actually happening here
Hallo every one,
I did nanoidentation experiment :
1 photoresist with 3 different layer thicknesses.
My results show that the photoresist is harder when it has thicker layer..
I can't find the reason in the literature.
Can any one please explaine me why is it like that??
is there any literature for this?
I have dyed jute-cotton blended fiber with onion peel and other tannin-containing mordants. But after FTIR analysis, we could not explain if there was an increase in bond formation due to the use of tannin than the non mordanted.Now is there a better spectroscopic method for better understanding bond formation in dyed sample and are there ways to determine the amount of bond formation in a particular sample?
Why is the satellite peak visible in the Cu2+ but not in Cu0?
The photoexcitation on the Cu site can lead to two final states, i.e. one: where after the creation of the 2p core hole the ground state configuration 3d9L is left roughly intact, second: where after the core hole creation one electron is transferred from the shell L into d state(3d10L-1). Latter one usually applies to the main photoelectron line.
I am in need of the physical and thermal properties of food grade silicon / BPA free silicone.
I am doing a comparative study on the design of mats used in the microwave ovens and other general thermal applications. This involves the iterations in the design and the materials grades.
I have selected few designs from the available sources. The design involves the pattern of the ribs that helps in heat dissipation.
I am struggling to get the material properties for the food grade silicone or BPA free silicone. The properties helps us to conduct the thermal analysis for the mat.
It will be highly helpful if you can help me in getting the properties of the food grade silicone or BPA free silicone.
Below links are for the design references for the product for which I am supposed to make the comparative thermal analysis..
Edits made :
Silicon is replaced with Silicone.
Tag word Silicon is removed.
I discovered two distinct phenomena when cracks begin to form at α and β phases in titanium alloys. How does this difference mechanism come about?
Hi for everyone,
I would like to do a Life Cycle Assessment comparison for teak timbers from various geographical locations. Could you please share with me any data that you have for carbon footprint on timber with their corresponding information?
Generally observed at low strain rate for fine grained material.
For industrial scale
which are viable materials?
which parameters need to alter?
Kindly express your views.
As every keyword have certain experts associated with it, based on their area of expertise. Can we initiate a devoted section for research collaboration, especially for the calls requiring bilateral or multinational collaborator?
Presently, My group is looking for a German collaborator in the area of " High performance based C-C composites" on following call "http://www.dst.gov.in/sites/default/files/DST-DFG-JointCall-10AUG2018.pdf"
Finding it difficult to have a relevant and interested group from Germany. kindly text me if anyone finds this call interesting.
Please share how I should proceed to search for interested researchers from Germany, My present approach is searching research papers on said area and mailing to the researcher if find relevant.
we want to produce VAR electrode (d=150 mm) from scraps (Ti 6-4) for melting (with attached shape). what is best solution for producing of initial electrode? can we cut it to small pieces and pressing in related mold and welding final discs together? is this way practical?
please guide me if you please.
I´m currently working for a medical device company. We are trying to understand the buckling effect during an insertion force test.
We use a flexible PVC extrusion with these properties:
Hardness: 95 (ASTM D-2240)
Specific gravity: 1.73 (ASTM D-792)
Tensile strength psi: 3400 (ASTM D-638)
Elongation%: 250 (ASTM D-638)
100% Modulus psi: 2860 (ASTM D-638)
This extrusion is inserted into another medical device and the force required to insert the extrusion must be below 4 lbf. However, it is noted that during insertion procedure the extrusion buckles, losing force and failing test. The extrusion is inserted using a fixture to guarantee that 4lbf are being applied, there are some cases where the readings of the force tester are below 4lbf but the extrusion get stuck and didn't pass all the way thru the medical device not reaching the desired end position. Our guess is that the column force is lost as result of buckling.
Extrusion length is about 10 inches, OD is about .077” and ID is .035”, this isn’t a solid extrusion. For this case, we would like to know much force (lbf) can be applied to the extrusion before buckling. Seems like we might use Euler formula, but it is unclear to me how to use the formula adding the factor that this isn’t a solid column, I assume wall thickness may be considered.
I appreciate any help to solve this doubt.
Need to do strain controlled fatigue test on ASTM E606 specimen. What I have referred from a research literature they have given strain ratio R, of 0.5 and a frequency of 0.2 Hz and strain levels of 0.7%–3.0%, 70% decline of peak load could anyone tell me how to decide this values ? From where they used the values there is no reference paper they have used in that particular research article.
I am studying the combustion of diesel, biodiesel, gasoline mixtures, and at this stage of the project, I must import the previously developed Physico-chemical properties of these fuels into fluent and analyse the validity of the Physico-chemical data for each fuel individually. I came across some solution for creating a new database, saving it as a .scm file and importing it into fluent, however, my Physico-chemical properties are temperature-dependent, which means it is not simply a constant but varies with temperature.
I appreciate it if you kindly help me out with this if you had encountered this before.
FYI, the Physico-chemical properties are as follows:
liquid density, vapour pressure, surface tension, liquid viscosity, liquid thermal conductivity, heat of vapourisation, vapour heat capacity, vapour diffusivity, vapour viscosity/thermal conductivity, liquid heat capacity and critical properties.
How to sift and separate particles of a certain size from a set of particles of different micrometer sizes?
for example we have 1kg of metal powder with size between 20 um to 120 um
we want to separate 30um particles, how can we do this?!
I am working on the development of magnesium alloy AZ91 composites by powder metallurgy route. During the sintering of pure alloy samples, there is a decrease in density. Generally, density increases after sintering. What can be the possible reason for this anomalous behaviour? I have read in some papers that this can be due to foaming. Also, please tell me how I can avoid this?
I am working on the fabrication of perovskite solar cells. To improve their performance, I am trying to prepare doped perovskites. However, I am faced with the challenge to optimize the dopant concentration ratio ( mol%). Can anyone please shed light upon the following question?
1: What factors should be considered while deciding the concentration ratio of the additive for perovskites?
Thank you for your support.
Abdul Sattar Chaudry
is it necessity to homogenize cast ingot of wrought superalloys (such as Hastelloy X, haynes 25 etc.)? if hot forging or hot rolling were done without homogenizing heat treatment what is happen?
How to do theoretical calculations to determine the relaxation rate from radiative processes for any materials (doping system ) (DFT)?
I am trying to dissolve chickpea protein isolate in water but it's not soluble even with raised temperature and constant shaking. Can anyone please suggest the appropriate method or solvent other than water in which chickpea protein isolate gets completely soluble.
After the synthesis of a compound at the mono Crystal form I process by structural determination. I ground the product and passed in XRD powder, when I calculated the distance and the lattice planes with HKLgen (using the cell parameters found for the single crystal), I cannot index my spectrum powder? (I did the same for three other hybrid compounds is always the same).
Both of these standards are relevant to testing materials at high temperatures.
When can we use ISO 834 and when can we use Standard ASTM E119?
What is the main difference between them? Is Fire Curve similar in them?
Thickness and diameter shrinkage percentage of the Al2O3 sample (after sintering):
The grain orientation spread is a powerful tool to reveal recrystallization on the structure evolution. However, I still couldn't clearly understand the GOS result shown with the mechanical behavior effect.
I am testing on the impact of different keycap textures e.g. matte, gloss, rough which measured by Ra, Rpc. Can you suggest on the test that represents or simulates 2 years usage on gaming or heavy usage keycaps?
I am currently working on a soft strain sensor having a wavy fluidic cyclic channel. To get data in the form of electrical, I have to attach electrodes to both ends of the fluidic channel of the soft strain sensor and it must be properly attached so that fluid in the channel may not come out of the channel. But I am confused, which electrodes should I use for this sensor?
I am a novice student doing a research project on water absorption in polymer composites with sodium silicate coating.
I want to ask about how to determine the result of the percentage of water absorption which is the sum of the percentage gain in body weight and the percentage of dissolved matter lost
for example, the conditioned weight is 9.76 grams then the wet weight at the time of immersion for 24 hours is 7.05 grams. Because there was a reduction in weight, my specimen was reconditioned with the result that the reconditioned weight was 6.83 grams.
Is it true that the percentage increase in weight was -27.77% and the percentage of dissolved matter lost was 30.02%? Then to determine the percentage of water absorption, just add (-27.77%) + (30.02%)?
Is there something wrong with my calculations?
please help in that case. thank you
Recently I tested a novel superhydrophobic coating by means of potential curves. What is odd is that I found a significative change in Ecorr (from 800 to 500 mv in comparison with the bare metal...) but instead of a lowering of Icorr I found an increase in ICorr (10-8 bare metal to 10-7 protected). The coating is conductive (it's C based). I have no idea how to interpret the results. Any ideas?
Why do we say matter is finite?
This is a question to start the discussion.
In my opinion, matter is unlimited in terms of behavior and change (changing), and it is structurally limited.
But material is limited, both in terms of behavior and structure (it is limited in both cases).
What is immaterial?
Sorry for my poor English, I have a question want to know.
Recently, I was doing a experiment about TEM image analysis. But this image was very irregular compared to other ones. I added 2 images for explaining my question. Both samples I use is AA6061 alloy, the only different part is there is one sample(fig. 4-1.2M-1) which has been applied on current.
fig. 2-1.2M-4 is normal one, it has a lot of planes I can do some research, but another one(fig. 4-1.2M-1) has only 1 plane.
These 2 sample both underwent heat treatment.
fig. 2-1.2M-4: current stressing after annealing
fig. 4-1.2M-1: only annealing
I am wondering that if dislocations or residual stresses had be eliminated or the orientation had re-arranged in the annealed sample?
I want fast method to measure moisture content in raw material, I think NIR method is good but someone said this method is not more accurate especially to coarse aggregates.
From FTIR peaks, we can generally calculate the elastic property and the Debye temperature from the Waldron model of a composition.
What else we can calculate aside these calculations?
I have some h-BN powder which I need to use to prepare film by using drop-cast technique on Si/SiO2 substrate . Please tell me which solvents at which proportion should I use along with the experimental procedure.
Which condition will also ensure that the nanoparticles will not form any separated islands on the substrate and will be well dispersed in the solvents?
what is best way to producing of wire rod 10 mm or less of superalloys such as Alloy 718 (Inconel 718) to reach optimum mechanical properties? casting in VIM (Vacuum induction melting) is probably first step, is it essential remelting (ESR or VAR) for wire production? what is aspect necessary for mold dimension (diameter) in casting and remelting to produce wire rod of 10 mm?
Hello we all know the electronegativity scale and concept of elements in the periodic table
However when it comes to whole materials such as polymers, nanomaterials and etc
How can we understand theoretically if the synthesized material is highly or poorly electronegative ??
I'm working with a photo polymer resin use blue light to solidifies it. I want to find the Poisson's ratio and shear modulus for solid part after light curing. What testing device or testing method I can use to find these material properties?
I’m doing a simulation of a compression test with an hyperelastic material, defined with Mooney-Rivlin 2 parameters, on Ansys.
I’m obtaining different results making both displacement controlled and load controlled:
If I set a 3 mm linear displacement, I obtain a 30 N force reaction;
If I set a 30 N linear load, I obtain a 4 mm deformation.
I tried changing the strain rate because hyperelastic material should change the deformability with the strain rate, but it doesn’t change at all the results.
I'm looking to assemble a goniometer for an experiment involving adhesion/roll of blood on different materials. Effectively I need to put together a stage, where the angle can be adjusted/set and measured precisely while the material is firmly secured. As well as this I will need to be able to take photographs of the roll, so the setup should allow for lights/camera.
There are several online but they are £££. Any experience creating a similar setup appreciated! Links to components would be great.
It should be either decrease or increase for nth time during heat supply. Is there any possibility of irregular temperature sequences as shown in figure. In that picture the highest temperature lies around 168 °C, but that values keep decreasing and increasing. What causes it ?
The method of heat supply is two- probe electrode method. Probe material is copper. The values were recorded using a thermal camera. Time and current value is constant.
As shear strength of AA2024-T4 alloy is inversely proportional to the temperature. is there any equation to predict shear strength of AA2024-T4 with respect to temperature?
I would like to coat MXene (Ti3C2Tx) on FTO glass substrate using doctor blade deposition technique, for which i think a binder is essential for the adhesion of MXene onto the FTO. The post treatment of the FTO after deposition will be restricted to 150C, could anyone suggest me a binder which could evaporate within the range of 150C during the post treatment of the FTO.
I am testing the impedance of a material that will be used for ECoG electrodes.
I was told to test it at a frequency range from 1 Hz - 100 kHz but why is this range used? I wasnt able to find a satisfactory answer.
Which impedance values are good for recording and why? Is there a range ?
Before obtaining the yield stress vs inelastic stress for compression and stress vs cracking stress in tension using Concrete Damage Plasticity model, do we need to convert the engineering stress-strain curve to true stress-strain curve or we have to process engineering stress-strain data ?
i have to choose a fatigue testing machine for additive manufactured metal parts.
Materials would be generic metals such as stainless steel, inconel etc.
The goal is to create simplified woehler / SN curves in a short time.
How can i decide which machine fits best?
Im looking for advantages and limits of the different machine types such as servohydraulic, electrodynamic, resonant pulsators and ultrasonic testing machines.
Also what is the limit for my test frequency to not get false results?
Does anyone know microscopic spheres, that have carbonate composition, which look like the objects described in this work?
because of Designing of VAR furnace, operator have problem to detected arc position and arc gap during the melting process. in some cases using of special video camera is mentioned but there is no more information abut operation and set up in vacuum or outer case. also how could reduce noise of ambience (from supply power) and have good resolution. please guide me in this area.
I need references articles that explain the drawings for the following materials, which illustrate the diagram between DR UV-Vis spectrums of the following materials blank sample as expressed in Kubleka-Munk function versus
the measured wavelength and the materials are ZnO, CuO, Fe2O3, and Co3O4.
We need to model deformable metal powder. It will be further used in simulation process.
i have a question regarding dielectric constant of gold,cobalt oxide (co3O4) and n-tpe silicon . i find only one publication on this issue showing dielectric function cobalt oxide(CoO) 12.9 and gold 6.9 at 25 degree centrigrade ..can any one suggest where I can consider this for my simulations ?
I would like to know the various transition metal chalcogenides or dichalcogenides (Se or S based), it would be most appreciated if their synthesis is also shared.
I have the option to write a Bachelor thesis about a simulation of a test bench for elastic materials in Ansys/Abaqus. To be honest I am an industrial engineer and I have only experiencie with CAD and just a little bit of construction knowledge. But that isn´t much.
It is still intriging to me to try it out, because it sounds very interesting and I feel like I could learn a lot.
I just do fear that I am underestimating the amount of time and dedication this will take to master the thesis in 3 moths. You can see the part of the testbench that I will have to simulate in the attached picture. From what I understood first I will have to model this part of the test bench, than I will have to calculate the mechanical forces, I will have to find out the material characteristics and calculate some thermodynamics.
Do I need knowledge about the behavior of the material? or does Ansys/Abaqus do this part for me?
I know this isn´t much information, but I wanted to ask what do you think about it? Is it risky for me to try to learn and write it down in 3 months?
Thanks a lot!
Object while returning into atmosphere attends Hypersonic speed and to save what's inside, what material should be used to manufacture heat shield.
I am looking for paint or in an extreme case a coating material on inAtmosphere flying object to reduce the heat dissipation caused by aerodynamic heating for a relatively longer period, considering the speed range of upper hypersonic range.
I can not find literature with comprehensive description about break downing of as-cast of CP Titanium after Vacuum Arc Remelting (VAR) process. what is best rout for hot rolling of CP titanium Gr.2? rolling in alpha area (about 700 C) is preferred in some cases, is it practical for 20 Kg ingot?
When we slip our finger on a material, there exists friction between them and this friction differs when we slip our finger on another material. Since the characteristics of the materials such as roughness or stickiness are different, is there any model to provide the COF with respect to the material's characteristics?
We have grown h-BN in MOCVD and the as-grown sample showed the Raman peak (E2G) around 1367 cm-1 which is expected. However, after annealing at nitrogen at 1200o C the peak got shifted and we found it at 1346 cm-1 as shown in the figure. Interestingly, the same thing happened while annealing was done in oxygen too. However we found the intensity was too high. Could you please explain what these peaks are?
Ti Gr.7 (Ti-0.2Pd) is most corrosion res. grade of Ti alloys. for manufacturing of round bar we want compressing of sponge Ti by Pd, but weight of Pd is modest (about 60 gr in 30 Kg of round bar). What is best way for alloying and blending Ti with Pd for next briquetting and VAR (Vacuum Arc Remelting) step?
Hi everyone, could you please send me any reference you know about Titanium or Nickel based alloys fatigue behavior? or if there's an article comparing them both, Let me know.
I am trying to simulate solar cell in AMPS .
But for simulation it needs material property like Relative Permittivity, Bandgap Eg (ev), Density of states in conduction band Nc (cm-3), Electron mobility μn (cm2/v/s), Hole mobility μp (cm2/v/s), Donor concentration Nd (cm-3), Acceptor concentration Na (cm-3), Affinity etc.
is there any easy way to get all the property of a individual material in a particular website or resource.
I have impregnated my activated carbons with a solution of PEI (Polyethyleneimine) using either methanol or water as solvent.
I was wondering how I could work out the amount of polymer which has been actually loaded onto my carbons after carrying out the wet impregnation procedure.
I've been recommended to use a gravimetric method (i.e. mass balance). However, in order to have a reliable figure, I'd need to make sure to completely remove the solvent (methanol or water) without losing any polymer. Could you suggest any suitable drying conditions in order to achieve that?
Also, could you recommend any alternative method? For instance in some papers authors performed TGA for impregnated and virgin carbons and worked out the actual PEI loading as difference in their volatiles content (assuming that the excess of volatiles in the impregnated sample is due to the polymer decomposition). Which type of temperature programme could I use in this case?
Suppose that we have a strip of piezoelectric material and this strip is subjected to a load on its surface and it is required to calculate the voltage across the thickness of the strip. What are the steps to do this? What assumptions should be made regarding the constitutive relations?
looking for some helpful sources that have studied/researched the shear analogy approach in wood material/products