I have stress-strain data, the curve looks like below. I have been told Young's modulus is the slope, and if the slope is 0.104, what does that mean? Does this mean my E_H = 0.104 GPa?
https://preview.redd.it/0tn4hc25z3971.png?width=664&format=png&auto=webp&s=d18f0dc1d378537f9ccbb497b38b4657747758c8
I am running a uniaxial compression/nonlinear buckling test, and want to create a stress/strain curve but cant get it to work. Does anyone know where I am going wrong in generating a stress/strain curve in this model?
Hello,I'm trying to obtaining the Stress/Strain responses of an hyperelastic material (described through the Ogden Constitutive parameters) of a stent-like lattice.My boundary conditions are very basic as that I constraint the movement of the lattice in the Y direction and expand it by 6mm in X/Z.However when I pick different elements to graph (in the same model and across other stent models) I seem to have very different material responses for each and nothing that resembles the graphs from study of which i've taken the Ogden Coeffs.Can anyone help me theorize what would be the causes of this ? My take is that one could be that im using the default CSYS or perhaps the fact that my merse is coarse (3mm/while stent is about 100 Height,40 diameter and 4 mm thickness) this is because im running on limited processing power and nodes.Or perhaps is some characteristic of the hyperelastic material im not taking into account and should somehow normalize for each model ?
Sorry if my question lacks any details or accentuates lack of knowledge I'm new to ABAQUS and FEA,thanks for the help and please let me know if clarification is needed.
https://preview.redd.it/s8ii6jp8hyr61.jpg?width=660&format=pjpg&auto=webp&s=19242f575c41045de4cdeacdbc3dda741208970a
I followed this video as it is but I'm only getting 2 increments on job monitor. I can share more details incase needed. If you know any better way to plot stress strain curve please help.
Why does the stress keep decreasing and why does Young Modulus become negative after reaching the breaking stress or Ultimate Tensile Strength of any non-brittle material?
I have a project that I plan to use carbon fiber for a few years down the line, involving high pressures. I looked online to see average yield strengths for it but only found ultimate tensile strength estimates.
I then tried to find stress-strain curves for carbon fiber, to see if there’s any significant difference between the yield and ultimate tensile strengths for carbon fiber. The ones I found seemed to point to the conclusion that there isn’t very much deformation before failure, meaning the yield and ultimate tensile strengths are very close.
Anyone who’s used carbon fiber, is this an accurate conclusion to draw about carbon fiber?
Hi, I'm preparing an exam and I have a doubt.
The stress strain curves of a pure metal and a metal alloy are different. Why is that? How does an alloy act differently?
Thank you!
I just cant find a material that has a stress strain curve similar to this.
https://imgur.com/a/2U1LvjR
It seems like stress-strain curves only imply extension as a result of tension, but the curve would look very different if the material were under compression (I’m imagining a vertical asymptote at -100% extension). Is there a reason why stress-strain is dealt with mainly in terms of tension ?
I have several data sets from tensile testing 'dogbones' and I would like to subtract my baseline coupon from the other tests. However I can not simply subtract one stress data point from the other because the strains don't line up. for example,
baseline data: [.0636, .0052] [.79, .0097] [1.27, .013] coupon #1: [.0685, .0073] [.94, .008] [1.42, .0135]
I would like the x values (strain) to match up before I subtract the Y values (stress).
I am on excel version 1906. thank you
I know it’s the sub but I couldn’t find an active sub for spreadsheets. I need a stress strain curve for my engineering class and all videos are for excel but I don’t have excel.
On my stress strain curve I’m getting results that strain decreases as stress increases, have I don’t something wrong? https://imgur.com/a/Dm1VH4u
In general, I already learn that in elastic region on stress strain diagram, the line should be increasing linearly and the law y=mx is applied. But when I plot the tensile stress strain diagram with real experimental data from steel tensile test, I notice that the line in the elastic region is not straight line. Is there any scientific explainations for it?
Edit: Thank you for those who replied on the comment section.:) very appreciate it.
Hello everyone,
I want to do a crush simulation of a can using LS-DYNA. Therefore I need to define a true stres vs (effective) strain curve of my material. I have found various of these curves but they are only defined up to UTS.
Does anyone know what happens after this point in LS-DYNA? Is the rest of the curve extrapolated or does LS-DYNA assume a perfect plastic material behaviour atfer UTS? And what would be the best to assume the material behaviour after UTS?
I hope someone of you can help me, I couldnt find help anywhere else so far.
Best Regards, Wursti777
Hi, I am working on a project where we are modelling the plastic deformation behaviour of a shaft with cutouts in the sides of it. Basically we have performed compression tests to give a stress strain curve of the plastic material (see below):
Basically I want to model the "const" line in ansys to get a non linear analysis. The issue is ive been trying to use bilinear/multilinear harderning model to do this. ANSYS does not allow negative tangent modulus as can be seen in the dip using the hardening model. Im wondering if anyone knows a solution for this or an alternative?
https://preview.redd.it/bg470hn3ibn11.png?width=1029&format=png&auto=webp&s=38e0d5ca90858ab465be57a744d727b83cec3066
If i have an engineering stress strain curve, is there any way that I could convert this to a true stress strain curve. I know that there are those two equations that do this conversion up until the point of ultimate tensile stress but what if I wanted to find out the true stress at fracture? How would I go about doing this?
Thanks!
We recently ran a tensile test using PASCO. The data output is position and force. How is strain calculated? Is it just the position divided by the nominal length? Also, when I plot that data, the LOB does not go through the origin (~10^-5) Should I force the data through the origin to more accurately calculate Young's modulus?
In this assignment, I've been given stress-strain data for 3 materials that were pulled to failure: Low Carbon Steel, 7075 T-6 Al, and PMMA. I need to graph the curves and find yield strength, ultimate strength, and modulus of elasticity, resilience, and percent elongation.
We were also provided the following info about each specimen: https://imgur.com/bgznops
I first graphed the stress-strain data of all 3 in excel: 7075 T6 Al: https://imgur.com/kg8jEiU Low Carbon Steel: https://imgur.com/iZzTS4T
PMMA: https://imgur.com/QsqrHfR
I'm stuck on how to find all the data, what would the cross-sectional area that I would use be? For the modulus of elasticity would it be estimating where plastic deformation occurs?
I was just wondering what exactly happens to the stress-strain curve of steel rebar when it is unloaded in the strain hardening region.
I have a project where I've been loading a carbon steel bolt repeatedly by tightening a nut and measuring its length. Even though each tightening pass doesn't reach yield, there's always torsional relaxation that increases the length of the bolt, i.e. there's no tensile plastic deformation but torsion does cause plastic deformation. As a result, after several tightening passes, if it were to make a stress-strain curve, I get a curve that seems to be hopping as it nears the yield point. It's somewhat similar to the curve obtained by steels that show Luders bands, yet without a stark serrated portion. I'm thinking it might be related to Le Chatelier principal/dynamic aging. Is anyone familiar with this? Or have any idea as to why applying torsion can lead to this "hopping" stress-strain curve that extends past the yield point?
Hey guys,
Need your help. Does anyone have a file with the points for a stress-strain curve for Al 1000? We're currently out of test bodies at our department, and it would be important to show the difference between Al, Cu and steel.
Thanks,
jepe
I need the stress-strain curve for M2 tool steel for an assignment that I am working on and was hoping that someone here could provide me one. I was only able to find hardness curves with my google search.
I let a family friend (slightly clueless) to purchase grade 5 for me, but running tests on it I'm fairly sure it's not grade 5.
For my project I'm testing the material characteristics of Titanium and copper in the context of nuclear waste disposal containers.
The tensile properties of Ti Gr-5 were to be studied however the stress- strain curve gives a much lower UTS, a much higher strain at fracture and the energy dispersive spectroscopy is indicative of commercially pure titanium.
Could someone help me identify the grade of titanium from the images attached?
Thanks very much.
https://imgur.com/a/7pJHTjF STRESS STRAIN CURVE https://imgur.com/a/vR0dMZr SEM ANALYSIS
This curve I remember back in college my professor asked this question once and none of us could answer it. He said it had something to do with the crystalline lattice structure of but never elaborated on it. And there was no follow up. Can anyone answer this?
Hi!
I'm trying to gain some more fundamental understanding of the behaviors of materials as they approach ultimate strains, and the best methods for modeling materials at strains past a several percent. I'm mostly interested in metals, but I'm interested in the general topic as well...composites and polymers, which I realize are likely treated much differently.
I would like to begin to be able to accurately model the behavior and subsequent failure of materials using (for example) damage and softening (damage evolution) models in Abaqus (and other solvers). I have been working through the documentation which is fantastic, but I am interested in what is really required for grounded, reasonable estimations of post-failure behavior.
I'm familiar at an expository level with material modeling like Johnson-Cook models to characterize temperature and strain rate dependency, which are fundamental to the responses I'm interested in, but I'm looking for literature in modeling methods, and potentially any articles that anyone can recommend that demonstrate some tested correlation so I can ground my understanding.
I'm familiar with element deletion techniques and how to "set up" models that fail at certain strains, but I'm interested in the methods behind developing accurate ultimate failure criteria based on FE results as well as development of test-based parameters to control post-failure stiffness degradation.
Anyways, if anyone can recommend some reading material, I'd be exceptionally thankful <3 ! Thanks!
If you look at the picture you will understand. (relink incase the original doesn't work, I suck at these things) http://imgur.com/tgY7Zdm
The sample is filament wound fiberglass. This is a test we had done a couple years ago (before I was hired). Looking at this data I'm confused.
I don't see how the strain can reduce at increased loads, how the sample seems to zig back and forth.
Was the company's extensometer out of whack? Or is it possible that the filaments started cracking and snapping back during the test, causing the meter to read sample shrinkage? Could voids above/below the meter give first, allowing the surface to retract toward the center of the sample?
These are the only logical conclusions I could make. Has anyone else seen data like this? I know polymer tensile testing can look crazy but I didn't expect something that seems to break the laws of physics.
I'm looking for a516 grade 70 steel.
I know how to make an engineering stress-strain curve and a true stress-strain curve. Now what values am i suppose to use to determine modulus of elasticity, the 0.2% offset yield strength, ultimate tensile strength, fracture strength, and modulus of resilience?
Looking for a textbook chapter or a published paper, preferably a link to a pdf. I need to learn more about what is going on (macro and micro) at specific stages of the stress strain curve of steel in a basic tensile test. For example, when microvoid nucleation typically begins, or what is going on atomically during strain hardening, stuff like that. Thanks in advance!!
I know that Young's Modulus is Stress/Strain. I have a table of data from an experiment, I've converted it from Force and elongation to Stress and Strain and I've graphed that. What I'm not sure how to do is calculate Young's Modulus. I had Excel do it, but the Young's Modulus decreased rapidly as the force went up. The material is a "mystery plastic" so I'm supposed to identify it by the Young's Modulus.
Any thoughts? Thanks.
Does anyone know how to get a stress-strain curve on a part after running Simulation (FEA)?
Thank you so much!
Hi, I'm preparing an exam and I have a doubt.
The stress strain curves of a pure metal and a metal alloy are different. Why is that? How does an alloy act differently?
Thank you!
Hi, I'm preparing an exam and I have a doubt.
The stress strain curves of a pure metal and a metal alloy are different. Why is that? How does an alloy act differently?
