creating 1d elements for the given model

objective - creating the 1D elements on the given model having cross-section and dof as follows-

a. Rod element - with only transational DOF and rbe2 link

cross section : BOX dimension a = 10mm

dimension b = 12mm

thickness t = 0.75mm

b. Beam element - with all DOF and rbe3 link

cross section : I section - dimension a = 8mm

dimension b = 10mm

dimension c = 8.5mm

thickness t1 = 0.75mm

thickness t2 = 0.6mm

thickness t3 = 0.6mm

c. Bar element - with only x and y DOFs with rbe3 link

cross section : channel - dimension a = 5mm

dimension b = 10mm

thickness t1 = 1.2mm

thickness t2 = 1.2mm

d & e. apply the mass of magnitude 10 with rbe2 link

f. join the two components with spring elements

procedure - . primarily,i imported the IGS file from the import solver deck.then i delete all the solids from the delete entity section.then i created the midsurface on the upper component by using the auto midsurface option under the midsurface command in the main menu bar under the geometry main menu page.then in the left side,in the tab bar i created another component named as bracket_2.also i renamed the midurface created on the upper component as bracket_1 in the tab menu.In this way the midsurfaces of both components remain isolated from each other and finally i again extracted the midsurface for the lower component.in the next step under the tools section i used organise command to move the mid surface of lower section into bracket_2.

. Again, in the tab bar i assigned the material steel having its properties of youngs modulus,poisons ratio,ID,card image etc for both the brackets.

.further,i created two properties in the tab bar named as bracket_1 and bracket_2 and selected the card image as pshell and assigned material steel.also i set the thickness 2 and 2.5mm for bracket_1 and bracket_2 respectively.

. In the next step,i assigned the property to both components bracket_1 and bracket_2.it automatically assigned the material as well for both components.

. In the next step,before the 2d mesh i created washer split of 5mm around the holes a,b,c,d and e.

. After this,i meshed the both components having element size 8mm and element type mixed by using the automesh under 2d mesh page and created the rbe2,rbe3 links with the given DOFs at each hole.the links are created by using 1d elements rigids and rbe3.

created link of rigid elements at hole a

. now,i have to create the bar,rod and beam elements in between these 1d elements links.for that,firstly i give cross-section to these beam,rod and bar elements by using the hyperbeam option in the 1d elements page.in the hyperbeam i selected the standard section where i set the standard selection library as hyperbeam.and also in the standard section type i selected the thinwalled box cross section for the rod element.

. After clicking on create the hyperbeam window opens and in that window i changed the dimensions of the given cross-sections as provided and also i create other cross-sections like I-section for beam element and channel for bar element and set their dimensions accordingly as i needed.also,i renamed these cross-section in the hyperbeam window as bar rod and beam.this gives the cross-section to these elements and in last clicking on the model view on the top i come out of the hyperbeam window.

hyperbeam window view

. after coming in the model view,i created rod,beam and bar elements at holes a,b and c respectively.under 1d elements page bar,rod and beam elements are available and i used these for creating them.

.now, for assigning cross-section to these elements i created properties for each bar,rod and beam element individually.where in the card image of bar,rod and beam i selected the pbar,prod and pbeam respectively.also i assigned the cross-section written as beam section in the property for each of the bar,rod and beam element.

properties of bar,rod and beam elements.

. now,in the further step i updated the properties under the rod,beam,bar element individually under the 1d elements.

updating property for rod element

updating property for beam element

. After assigning the properties the elements appeared in 1dimension.so i go to 1d transational element representation and on drop down i selected the 1d detailed element representation.at last,the coss-section of the beam,rod and bar appears after doing this.

cross sections of the rod,beam and bar elements

. for holes referring the positions d&e i created the rbe2 link on these positions and assigned the mass element to the independent node having magnitude of 10mm and set the element type as cmass1.it gives the locking to that link.

assigned mass element to the link

. At last,i created the spring element in between the two components by selecting the one node at each component where i selected the element type as CELAS1.this i done under 1d element page by clicking on springs option.

created 1d elements rbe2,rbe3,mass element,spring element with the rod beam and bar element.

Result - .extracted midsurface using auto mid-surface.

.done 2d meshing having element size of 8mm

.also,created rbe2 and rbe3 links with the given DOFs.

.created rod,beam,bar,spring and mass elements by assigning properties to them.