Great Video! What is the best stress to use in the fatigue tool - von misses or principle P1? How does Solidworks account for Stress Gradient Effects in fatigue? I know you can use a Goodman model in Solidworks Fatigue, but what about the Findley model that accounts for shear stress causing crack initiation?
Could you tell me which website is good to find S-N curve data? I'm trying to do a fatigue analysis for a FSAE car shift gear, but I could not find right S-N data for the project in the solidworks because my alternating stress for the model is very low
There's a number of material curves (SN curves, stress-strain curves, etc) available from an additional SOLIDWORKS material library, depending on your license of SOLIDWORKS simulation. help.solidworks.com/2020/English/SolidWorks/sldworks/c_sw_materials_web_portal.htm Any material with (SN) next to it in SOLIDWORKS will have some fatigue curve data on it, and there are also more curves available clicking the "File" option visible around 4:17 Unsure where the actual curve used in this video came from, likely one of these sources.
Hello, first of all, thanks for the video, was very instructive. There is still something I don't understand with fatigue test : at which speed the force is applied/removed during the test ? The fatigue test is based on a static study (meaning the force is applied very slowly). In the reality, it's not the case and the fatigue test results would be very different if the force is applied in one second or in ten. seconds… So I'm not sure to understand correctly the purpose of such a test ? Wouldn't it be more relevant to create firstly a dynamic study, stipulating at which speed the force is applied/removed and then to create a fatigue study based on the dynamic one ?
Hi- you’re correct, in this sample video we used a static study to represent the cyclic loading because we were interested more in the thermal and bending stress rather than any impact. However, the Fatigue study can use many different input studies for the events. Shock loads can be represented by selecting the appropriate time step from a Time History (or even Nonlinear Dynamic studies). Additionally, harmonic or random vibration studies can be used for fatigue events by selecting the frequency and/or amount of time that the vibrations occur- this will require you to select the appropriate option when initially creating the Fatigue study.
Hi there! Your video has been very helpful for my project. However i hve a question to ask. From the static analysis made how does it relate to the fatigue analysis ? I mean.. does the stress come out in static will be used in fatigue ? by importing the data results ?
Very helpful video! If you are dealing with low cycle fatigue case, then strain-life is a better approach. Is a strain-life approach possible in Solidworks fatigue study? If not, you would need to note the highest strain in the static study and compare it to the expected strain at failure (found by using the Coffin-Manson relation or from real strain test data), correct?
SOLIDWORKS Simulation fatigue is stress-life only so intended primarily for high cycle applications. Failure prediction due to low cycle strain-life fatigue is possible to simulate in SIMULIA Abaqus + FE-safe Otherwise could use a procedure for hand calculation like you described. This is also possible for manual stress-life predictions from a static study, but gets more complicated in the event of multi-event loadings or other factors. SOLIDWORKS Simulation also does correction for differences in mean stress and has further options related to fatigue in the Study properties. A fatigue strength reduction factor can also be input there to compensate for factors such as surface finish or corrosive environment. Additional information is available here: help.solidworks.com/2022/english/SolidWorks/cworks/c_Fatigue_Analysis.htm?verRedirect=1
i have a question. for example that failure due to fatigue is likely to occur after approximately 16,510 cycles. but i don't know 16,510 cycles approximate how many hours or days?. thanks alot
Hiii I saw yr video it's really useful bt I hve a question what's meaning of cycle(N) like u put 100000000000 and or but what it's indicate day, year, hours, second,...... I am waiting for yr response
There's a number of material curves (SN curves, stress-strain curves, etc) available from an additional SOLIDWORKS material library, depending on your license of SOLIDWORKS simulation. help.solidworks.com/2020/English/SolidWorks/sldworks/c_sw_materials_web_portal.htm Any material with (SN) next to it in SOLIDWORKS will have some fatigue curve data on it, and there are also more curves available clicking the "File" option visible around 4:17 Unsure where the actual curve used in this video came from, likely one of these sources.
Hi Alex- when you create an event in the Fatigue study, the type of loading event you select is associated with a “loading ratio” which will be multiplied by the maximum stress from your Event study to find the minimum. For example, with Zero-Based loading, the L.R.is zero, and so the minimum stress is zero. With Fully Reversed, the loading is assumed to be equal in both directions, which is why the L.R. is -1. If you don’t know the loading ratio, there is an Event type called “Find Cycle Peaks” which allows you to select two different studies (one for the max stress and one for the min).
uhhh You kinda already had the study there, I cant follow that, why didnt you start from scratch like someone normally would? This is just a static study?
Hi Ryan, you are exactly right- this video starts with an existing Static study already set up and already run. The most common way to use Fatigue studies is to reference an existing Static study. Fatigue studies can also reference certain Dynamic study types (Harmonic and Random Vibration) Once there is a static study created and solved, create a Fatigue study and choose to "Add Event" to reference back to the Static study loading, and specify number of cycles and loading type. There are also some good tutorials integrated into SOLIDWORKS helpful for getting started with Static Studies and Fatigue, accessible under the Help Menu -> SOLIDWORKS Simulation -> Tutorials
The Damage plot shows the percentage of the model’s fatigue life that will be used up after the number of cycles defined in the setup. Any areas over 100 mean that fatigue failure will occur. If you create a Fatigue study with only one event, you can also view a Life plot, which plots the number of cycles until failure on the model.
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Great Video! What is the best stress to use in the fatigue tool - von misses or principle P1? How does Solidworks account for Stress Gradient Effects in fatigue? I know you can use a Goodman model in Solidworks Fatigue, but what about the Findley model that accounts for shear stress causing crack initiation?
Could you tell me which website is good to find S-N curve data? I'm trying to do a fatigue analysis for a FSAE car shift gear, but I could not find right S-N data for the project in the solidworks because my alternating stress for the model is very low
There's a number of material curves (SN curves, stress-strain curves, etc) available from an additional SOLIDWORKS material library, depending on your license of SOLIDWORKS simulation. help.solidworks.com/2020/English/SolidWorks/sldworks/c_sw_materials_web_portal.htm
Any material with (SN) next to it in SOLIDWORKS will have some fatigue curve data on it, and there are also more curves available clicking the "File" option visible around 4:17
Unsure where the actual curve used in this video came from, likely one of these sources.
. Good video I hope to know. The fatigue study is included in the model after 31 % damage test will fail or withstand?
Hello, first of all, thanks for the video, was very instructive. There is still something I don't understand with fatigue test : at which speed the force is applied/removed during the test ? The fatigue test is based on a static study (meaning the force is applied very slowly). In the reality, it's not the case and the fatigue test results would be very different if the force is applied in one second or in ten. seconds… So I'm not sure to understand correctly the purpose of such a test ? Wouldn't it be more relevant to create firstly a dynamic study, stipulating at which speed the force is applied/removed and then to create a fatigue study based on the dynamic one ?
Hi- you’re correct, in this sample video we used a static study to represent the cyclic loading because we were interested more in the thermal and bending stress rather than any impact. However, the Fatigue study can use many different input studies for the events. Shock loads can be represented by selecting the appropriate time step from a Time History (or even Nonlinear Dynamic studies). Additionally, harmonic or random vibration studies can be used for fatigue events by selecting the frequency and/or amount of time that the vibrations occur- this will require you to select the appropriate option when initially creating the Fatigue study.
Hi there! Your video has been very helpful for my project. However i hve a question to ask. From the static analysis made how does it relate to the fatigue analysis ? I mean.. does the stress come out in static will be used in fatigue ? by importing the data results ?
Very helpful video! If you are dealing with low cycle fatigue case, then strain-life is a better approach. Is a strain-life approach possible in Solidworks fatigue study? If not, you would need to note the highest strain in the static study and compare it to the expected strain at failure (found by using the Coffin-Manson relation or from real strain test data), correct?
SOLIDWORKS Simulation fatigue is stress-life only so intended primarily for high cycle applications.
Failure prediction due to low cycle strain-life fatigue is possible to simulate in SIMULIA Abaqus + FE-safe
Otherwise could use a procedure for hand calculation like you described. This is also possible for manual stress-life predictions from a static study, but gets more complicated in the event of multi-event loadings or other factors.
SOLIDWORKS Simulation also does correction for differences in mean stress and has further options related to fatigue in the Study properties. A fatigue strength reduction factor can also be input there to compensate for factors such as surface finish or corrosive environment.
Additional information is available here: help.solidworks.com/2022/english/SolidWorks/cworks/c_Fatigue_Analysis.htm?verRedirect=1
How can I make an curve for a material that is not exist in solid works program like bone
i have a question. for example that failure due to fatigue is likely to occur after approximately 16,510 cycles. but i don't know 16,510 cycles approximate how many hours or days?. thanks alot
The cycles refer to how many times it was loaded. 16510 cylces may happen in a hour, day or year depending on how many times the part is used.
How did you make the educated guess to input force value?
Hiii I saw yr video it's really useful bt I hve a question what's meaning of cycle(N) like u put 100000000000 and or but what it's indicate day, year, hours, second,...... I am waiting for yr response
Nice video, but are these features included in the student version?
The fatigue study is included with any license of SOLIDWORKS Simulation Standard or higher.
Hi, where did you find the SN curve for stainless steel? thanks
There's a number of material curves (SN curves, stress-strain curves, etc) available from an additional SOLIDWORKS material library, depending on your license of SOLIDWORKS simulation. help.solidworks.com/2020/English/SolidWorks/sldworks/c_sw_materials_web_portal.htm
Any material with (SN) next to it in SOLIDWORKS will have some fatigue curve data on it, and there are also more curves available clicking the "File" option visible around 4:17
Unsure where the actual curve used in this video came from, likely one of these sources.
thanks for the video. how can you define the max and min stress for the fatigue cycle. you only input the mean stress?
Hi Alex- when you create an event in the Fatigue study, the type of loading event you select is associated with a “loading ratio” which will be multiplied by the maximum stress from your Event study to find the minimum. For example, with Zero-Based loading, the L.R.is zero, and so the minimum stress is zero. With Fully Reversed, the loading is assumed to be equal in both directions, which is why the L.R. is -1. If you don’t know the loading ratio, there is an Event type called “Find Cycle Peaks” which allows you to select two different studies (one for the max stress and one for the min).
Thanks
uhhh You kinda already had the study there, I cant follow that, why didnt you start from scratch like someone normally would? This is just a static study?
Hi Ryan, you are exactly right- this video starts with an existing Static study already set up and already run. The most common way to use Fatigue studies is to reference an existing Static study. Fatigue studies can also reference certain Dynamic study types (Harmonic and Random Vibration)
Once there is a static study created and solved, create a Fatigue study and choose to "Add Event" to reference back to the Static study loading, and specify number of cycles and loading type.
There are also some good tutorials integrated into SOLIDWORKS helpful for getting started with Static Studies and Fatigue, accessible under the Help Menu -> SOLIDWORKS Simulation -> Tutorials
spatulas come with warranty? where?
At least one brand seems to! chefremi.com/products/kitchen-spatula-set-2-pieces
how do you interpret the results ?
The Damage plot shows the percentage of the model’s fatigue life that will be used up after the number of cycles defined in the setup. Any areas over 100 mean that fatigue failure will occur. If you create a Fatigue study with only one event, you can also view a Life plot, which plots the number of cycles until failure on the model.
@@hawkridgesystems Thanks for the explanation.