Timecodes: 0:00 - Intro 0:11 - Strain 0:44 - How to ? Stress-Strain Curve 1:33 - Strain Rate and Examples 2:21 - How to determine Strain Rate - Example 1 - Strain vs. Time 2:48 - How to determine Strain Rate - Example 2 - Tensile Test 3:27 - How to determine Strain Rate - Example 3 - ABAQUS 4:02 - Influence of Strain Rate on Stress-Strain Behavior 4:55 - Comparison: Tensile Test with different Strain Rates 5:28 - How prepare Strain Rate data for ABAQUS CAE 5:40 - Fracture Strain for different Strain rates
Dear Dr. Wagner I hope everything is going well with you. Thank you for your informative and comprehensive videos. I have a question; could we calculate the strain rate from the machining process like the proposed video? based on RF and U of nodal displacement of a single element in the chips? or is it possible to activate one of the field outputs like PE or LE or NE to get the strain-time graph? Thank you for your help and time.
I have a question, if we control the strain rate by changing the assigned displacement and the time period, does it matter whether we use dynamic or static steps?
@@gideonlyngdoh3538 depends on the type of the analysis, I have at the moment an analysis of a thick composite tube under axial compression. If i change the displacement (strain rate), the stiffness of the model changes (in the load-displacement curve, slope of the curve) in a dynamic explicit analysis, but not in a static analysis.
Thank you very much for the video, Dr. Wagner. As always, it Washington a great explanation!. One question, what would be the procedure to introduce material softening/degradation/bauschinger effect under cyclic loading?. Thanks in advance for your answer!! Regards!
here you can see the determination of the fracture strain: ua-cam.com/video/hVTdhgaQjyk/v-deo.htmlsi=TZ1kI-0tmAifQGap the definition of it is described in the ABAQUS USER MANUAL, the fracture strain is the strain where damage initiation starts
@@hnrwagner thank you! also, do you have a link for the ABAQUS USER MANUAL? I'm trying to find the definition for 'Displacement at Failure' in the Damage Evolution subsection, and how to obtain it.
@@user-ni8rq6cu7t Displacement at failure is also shown in the video, its Fracture Strain multiplied with the gauge length of a tensile test specimen. ABAQUS User Manual: classes.engineering.wustl.edu/2009/spring/mase5513/abaqus/docs/v6.6/index.html
strain 0.000154128 tensile strength as 1.37874 MPa this is the tensile data i obtained performing test on gfrp composite i dont know why i am getting so leeser value material properties are: E11=8943.066, E22=8941.682, E33=41396.052 and one more thing is that during experiment i have applied strain rate of 1mm/min but in abaqus i feed load as a velocity of 1/60 mm/sec is is okay
@@hnrwagner Abaqus 3D solid modeling of polymer composite materials for tensile test ..........during experiment i have applied load as 1mm/min........so the same load how to apply in abaqus.......please say
Thank you Dr. Wagner... best wishes for you and your family
great explanation Dr. wagner. Thank You
Hello Dr. Wagner ,thank you for this video
Timecodes:
0:00 - Intro
0:11 - Strain
0:44 - How to ? Stress-Strain Curve
1:33 - Strain Rate and Examples
2:21 - How to determine Strain Rate - Example 1 - Strain vs. Time
2:48 - How to determine Strain Rate - Example 2 - Tensile Test
3:27 - How to determine Strain Rate - Example 3 - ABAQUS
4:02 - Influence of Strain Rate on Stress-Strain Behavior
4:55 - Comparison: Tensile Test with different Strain Rates
5:28 - How prepare Strain Rate data for ABAQUS CAE
5:40 - Fracture Strain for different Strain rates
an interesting lesson thank you very much
thanks, more is to come, for example stress triaxiality
Dear Dr. Wagner
I hope everything is going well with you.
Thank you for your informative and comprehensive videos.
I have a question;
could we calculate the strain rate from the machining process like the proposed video? based on RF and U of nodal displacement of a single element in the chips?
or is it possible to activate one of the field outputs like PE or LE or NE to get the strain-time graph?
Thank you for your help and time.
Very informative video. Thank you, Dr. Wagner.
I have a question, if we control the strain rate by changing the assigned displacement and the time period, does it matter whether we use dynamic or static steps?
@@gideonlyngdoh3538 depends on the type of the analysis, I have at the moment an analysis of a thick composite tube under axial compression.
If i change the displacement (strain rate), the stiffness of the model changes (in the load-displacement curve, slope of the curve) in a dynamic explicit analysis, but not in a static analysis.
Thank you very much for the video, Dr. Wagner. As always, it Washington a great explanation!.
One question, what would be the procedure to introduce material softening/degradation/bauschinger effect under cyclic loading?. Thanks in advance for your answer!!
Regards!
I have a question about the stress triaxiality when you set 0 and when you set 1/3 for uniaxial tension
it only works if you have at least two values, so only 0 or only 1/3 makes no difference
How is the fracture strain determined? Why is it not the strain at the end of the stress-strain curve?
here you can see the determination of the fracture strain:
ua-cam.com/video/hVTdhgaQjyk/v-deo.htmlsi=TZ1kI-0tmAifQGap
the definition of it is described in the ABAQUS USER MANUAL, the fracture strain is the strain where damage initiation starts
@@hnrwagner thank you! also, do you have a link for the ABAQUS USER MANUAL? I'm trying to find the definition for 'Displacement at Failure' in the Damage Evolution subsection, and how to obtain it.
@@user-ni8rq6cu7t
Displacement at failure is also shown in the video, its Fracture Strain multiplied with the gauge length of a tensile test specimen.
ABAQUS User Manual:
classes.engineering.wustl.edu/2009/spring/mase5513/abaqus/docs/v6.6/index.html
Hello, Dr. Wagner, I really want to know how to define stress triaxiality. Could you make a video to explain it
Your videos have been very helpful to me. Thank you!
Will be the next video
strain 0.000154128 tensile strength as 1.37874 MPa this is the tensile data i obtained performing test on gfrp composite i dont know why i am getting so leeser value material properties are: E11=8943.066, E22=8941.682, E33=41396.052 and one more thing is that during experiment i have applied strain rate of 1mm/min but in abaqus i feed load as a velocity of 1/60 mm/sec is is okay
I do not understand your problem, can you rephrase it?
@@hnrwagner Abaqus 3D solid modeling of polymer composite materials for tensile test ..........during experiment i have applied load as 1mm/min........so the same load how to apply in abaqus.......please say
I was thinking that a true stress vs true strain curve is always increasing.
that correct, the equation for true stress may only be considered valid after Ultimate stress value from engineering stress.