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  1. Efstia

    3 point bending test on concrete beam - Problem with time increment

    4 point bending test not 3
  2. Efstia

    3 point bending test on concrete beam - Problem with time increment

    Hi Dave, Thank you for your reply. I changed the increments of the simulation and there is another error only for the increments. The simulation cannot converged. The beam didn't even bend. PLease see below
  3. Efstia

    3 point bending test on concrete beam - Problem with time increment

    Hi guys, I am performing a static analysis for a simply supported three point bending test. The beam is under displacement load control of -8 mm for U2 direction (vertical) through an amplitude 0,0 - 1,1. My analysis was aborted several times I am using the following: Maximum number of...
  4. Efstia

    Can I use a connector/spring to model a load cell?

    I am only interested for one rotational DOF as you mentioned and also to request the force as the output. So, at the end of the hinge (bottom) to extract the average force. However, where do I enter the stiffness of the load cell?
  5. Efstia

    Can I use a connector/spring to model a load cell?

    The load cell is a sensor made of steel used to measure the force (i.e. reaction force). The load cell has a specific stiffness in N/m units. My goal is to model the load cell, which will rotate in the horizontal direction, but it will be fixed in the other directions. Is the connector the...
  6. Efstia

    Can I use a connector/spring to model a load cell?

    What is the best way to model a load cell? Spring or connector element? The load cell (cylindrical in shape) is expected to rotate in the x direction having a stiffness of 1.7 x 10E9 N/m.
  7. Efstia

    Abaqus - Mesh for a complex part

    Dear Corus, I have sorted the problem out. Thanks a lot for providing the cae file. Regards, Stath
  8. Efstia

    Abaqus - Mesh for a complex part

    Thanks Rob and Corus for your help. Corus -- Thanks for your file. I have duplicated your partitions to obtain the separated parts and therefore get the tidy mesh using bias. However, I would like to ask how both horizontal and curved lines can pass thought from the points in the attached...
  9. Efstia

    Abaqus - Mesh for a complex part

    Dear all, I would like to create a structured mesh of the rotation shaft that I have attached. However, the geometry is a bit complicated. I have created lots of partitions in order to be able to mesh it properly. The mesh change to sweep instead of structures. Is there any possibility to get...
  10. Efstia

    Convert loading velocity rate to strain rate on 3-point bending tests

    BAretired, You are completely right. I did use the full depth instead of diving it in 2. Thanks. Stath
  11. Efstia

    Convert loading velocity rate to strain rate on 3-point bending tests

    BAretired Ok. If I consider a 3 point bending test same with the paper written by Millard et al. 2013 with a deflection rate of 0.18 mm/min which is 0.003 mm/sec: Span of beam = 300 mm Width = 100 mm Depth = 50 mm s = My/I M = PL/4 D = PL^3/48EI stress = E x strain strain = PLy / 4IE...
  12. Efstia

    Convert loading velocity rate to strain rate on 3-point bending tests

    What I have done to much their results was to calculate the peak load rate, Moment rate, stress rate. By assuming an E value , we get the strain rate. But again, my solution does not much their results.
  13. Efstia

    Convert loading velocity rate to strain rate on 3-point bending tests

    rb1957 They used peak load rate from impact force versus time graph. Do you claim they used peak load rate to find the strain rate?
  14. Efstia

    Convert loading velocity rate to strain rate on 3-point bending tests

    There is also a paper that they worked out the strain rate by applying the Hooke's law. So they got the peak load and by applying an E value, they calculated the strain rate; you need time to calculate the strain rate.
  15. Efstia

    Convert loading velocity rate to strain rate on 3-point bending tests

    You can record microstrains using strain gauges and convert them to strains. By plotting strain versus time you have the strain rate. But, can you work out the strain rate from deflection versus time data?
  16. Efstia

    Convert loading velocity rate to strain rate on 3-point bending tests

    The loading velocities were: 4.23 x 10^-3, 0.846, 70 and 100 cm/sec. Corresponding strain rates were 0.5 x 10^-5, 0.01, 0.8 and 1.2 strain/sec. The paper provides beam dimensions of 12.5 mm (thick), 75 mm (wide) and 300 mm (long). The tests with the smaller velocities were used normally under...
  17. Efstia

    Convert loading velocity rate to strain rate on 3-point bending tests

    You are right. The loading rate is for impact loading actually. I am reading a paper based on impact properties of concrete. They claim that the loading velocity of 100 cm/sec corresponds to 1.2 strain per second. I would like to know how they did work out the strain rate in an impact event...
  18. Efstia

    Convert loading velocity rate to strain rate on 3-point bending tests

    Hi, I would like to ask if anyone knows how to convert 100 cm/sec (loading velocity) to strain rate which units are strain per second. Thanks a lot.
  19. Efstia

    Impact on concrete slab

    Hi IceBreakerSours, I have introduced a damping of 5% by experience according to Abaqus documentation and a value for mass proportional Rayleigh damping factor was provided based on mode of vibration. I am afraid that I am doing something wrong with my contact analysis. I have used surface to...
  20. Efstia

    Impact on concrete slab

    Dear all, I am attempting to model an impact test using Abaqus. I have modeled a projectile falling from a distance of 10 meters using solid elements. The gravity was modeled though the dynamic explicit step. I have also used surface to surface contact with a friction coefficient of 0.2. My...

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