I have a doubt in the formulation of 3-D HEXA elements. I know for a fact that HEXA elements cannot take applied moments as it has only 3 translational dofs. In the case of a completely constrained cantilever beam with a point load at one end, there will be a reactive moment where it is...
I have a question on using 2d elements for building a hollow box beam section.If we take the mid-surface of the section and build the thickness on both sides, there will be penetration of the material (thickness) at the corners of the section. Can anyone please tell me the procedure to model a...
Hi,
This question is bugging me a lot and I have not found a convincing answer.Consider a plate in the x-y plane .If I apply a normal stress in the x-direction, will there be a stress in the y-direction due to poisson's effect? I am sure in a beam problem there will be a transverse strain...
I have a model of a pressure vessel for which I need to see the element stiffness matrix for a few elements.Is there any way of seeing the stiffness matrix only for selected elements in .f06 format or in .pch format in nastran.
Please help
Thanks in advance
Bharat
Hi,
I want to model a beam with a concentrated load of 60 N acting on the tip. I want the load to increase from 0 to 60 N in 0.001 seconds and again go back from 60 to 0 in another 0.01 seconds and check for the maximum stresses and deflections at that time. what kind of analysis should I carry...
Hi
I have modelled a ball and a plate impact analysis using abaqus explicit. I want to see the failure index due to the impact. I have used the fail stress option and also the field variable CFAILURE to check for the failure index using various theories but I am not sure where and how to...
Hi,
I have a doubt regarding the stress analysis of laminated composite cantilever beam. How do I carry out the stress calculations of a cantilever beam with a point load at the end of 10N?say for example I have a beam of length 1000 mm, width of 20 mm of 6 plies of 1 mm each so thickness will...
Hi,
I want to find out the torsional frequency of a component with 2 shafts,each shaft fixed to a frame on either side.The shafts are completely constrained at one of its ends and the other end is attached to the frame.Torsional stiffness of each shaft is 5000 N-mm. The frame is inturn attached...
I have modelled a circular plate attached to a frame using rigid elements. I have attached 2 cbar elements on either side of the frame and i have rigidly constrained the bar elements. I ran the file and got a natural frequency of 3Hz. I am not sure if the answer is correct. How to calculate the...
I have a square plate with 1 torsion bar on each side.The torsion bar is completely constrained to a wall. I have to find out the natural frequency along the axis of the bar. I just want to know that if there are two torsion bars as mentioned,are they considered to be in series or parallel...
Hi,
I have modeled a crash analysis of an Unmanned air vehicle on a rigid ground in abaqus explicit. I took the vertical velocity of the UAV as 700 mm/s (0.7 m/s) and the horizontal velocity 12000 mm/s. I want to find the g-force at the point of impact as soon as the impact takes place. The...
I am carrying out a crash/Impact analysis using Abaqus. Is there a way of finding out the G-force experienced due to the impact.Please help..
Thanks in advance
Bharat
Hi,
I want to find out the torsional frequency of a shaft attached to a rotor. the shaft is massless and with a torsional stiffness 5000Nmm/rad and the rotor is of a diameter of 200 mm and a thickness of 1.5 mm.. I am using the young's modulus of aluminum for the shaft and the rotor..Since I...
Hi,
I analysed a resin bond in a lap joint using a cohesive COH3D8 element for resin in one case and C3D8R element for resin in another case. I am not finding any significant difference in stress values. So what is the difference between a normal 3D element and a cohesive 3D element. Can...
Hi,
I have to model a lap joint joined together with resin of thickness 2mm in one model and a resin thickness of 0.3mm in another model. Here resin is considered as the cohesive zone. In the tensile test experiment the joint with resin thickness of 0.3 mm is showing much less stresses in the...
I have a flange on which a motor weighing 175 kgs is mounted. The CG of the motor is 155 mm from the flange. The flange is fitted to a shell using 12 bolts circumferentially. What would be the load on each of the boltts due to the eccentric load of the motor. The load is perpendicular to the...
Hi,
I am getting the nastran error message
"SYSTEM FATAL MESSAGE 6724 (SB11RD)
TOO MANY RESTARTS."
I have no idea on how to continue,Please help.
Bharat
Hi,
How to define the TABLES1 entry for elasto-plastic analysis of a steel component?
If possible can anybody please provide me with the x and y co-ordinate values for the same?
Thanks
Bharat
Hi,
I want to solve an autoclave component in nastran using sol 106(Non linear static). I have modeled the component using Hex20 elements.But whenever I put it to solve, it will complete in about 5 seconds and the f06 file will be 0 bytes. But if I model using hex 8 elements, it is solving. So...
