Two kinds of ANSYS finite yuan of unit application research
- Time:
- Click:189
- source:SEENER CNC Machining
1Unit of SOLID45 of SOLID45 unit brief introduction is used at structure of tectonic and three-dimensional solid. Unit is defined through 8 node, every node has 3 along X, y, the freedom of Z; direction translation is spent. Unit has plasticity, creep, expand, stress aggrandizement, big be out of shape and great strain ability. Similar unit has the SOLID64 unit that applies to anisotropy material. The more high-ranking unit of SOLID45 unit is SOLID95, unit is defined by the material parameter of 8 node and isotropy. Correspondence of isotropy material direction ties way at unit coordinate, unit load includes node load and unit load. 1.
2SOLID95 of SOLID95 unit brief introduction is SOLID45(3 dimension 8 node) high-ranking and unit form, this is unit can concessional irregular appearance, and won't reduce an accuracy, the model; that suits border to be a curve particularly at the same time, the compatibility of its deflection appearance is good, SOLID95 has 20 node definition, every node has 3 freedom to spend, (X, y, z direction) , this unit is in dimensional azimuth is aleatoric, this unit has plasticity, creep, radiate to expand, stress stiffness, big be out of shape and the ability of great strain, and offer be defeated by item of expenditure differently. 2 example are analysed 2.
Model of fictitious and three-dimensional CAD is like model of 1 emulation analysis and result the graph is shown 3 times, fictitious to this in ANSYS three-dimensional model differentiates reseau, divide kind of unit to differentiate respectively reseau: (1) is unit of 8 node SOLIU45 the first kind, (2) is unit of 20 node SOLID95 the 2nd kind, undertake to these two kinds of models in ANSYS mode is calculated respectively (among them the underside below the model secures) , get each rank if the watch is shown 1 times,mode parts. Pursue among them 4 are shown differentiate to use SOLID45 unit the first-order mode of reseau model, the graph is shown 5 times differentiate to use SOLTD95 unit the first-order mode of reseau model, and by the watch 1 in reach, the first-order frequency of SOLID45 unit model is 60.
227Hz, and the first-order frequency of SOLID95 unit model is 44.
127Hz, two rank frequency differs 16.
1Hz, have apparent inconsistency. 2.
2 experiments model and result experiment are secure the end end test specimen, an accelerometer is installed in top, on test specimen knock measures topmost response with accelerometer, do spectrum analysis to reach next the frequency of test specimen. Experimental system is shown 6 times like the graph. The experiment measures gotten acceleration signal, the spectrum graph after doing measures signal spectrum to analyse is shown 8 times for the graph. By the graph 8 knowable, the experiment is measured so that frequency is: 39.
79Hz. 2.
first-order mode is the SOLID45 unit model that 3 results analyse emulation computation to go out 66.
227Hz, the first-order mode of SOLID95 unit model is 44.
127Hz. Experimental result reachs the frequency of the model is 39.
79Hz. Can see by afore-mentioned results, the data that the computational result of SOLID95 unit and real test get is more adjacent. And the computational result of SOLID45 unit and measure gotten data actually to differ very big. But because SOLID45 unit is 8 node and SOLID95 is 20 node. Because this is in calculation is same rank when mode, SOLID95 unit model can expend more time and computer resource. When because this considers the model that has curved surface unit in juice,reseau differentiates, want to make computational result accurate, reliable, should choose SOLID95 unit to differentiate model reseau. If be a few basic parameter that estimate a model probably and limits only, when demand of a few pairs of results is not high, can consider to use SOLID45 unit to differentiate model reseau. 3 conclusion can be seen by the contrast of emulation analysis and experiment, SOLID45 unit is when computational curved surface and 2 kinds of mode of the model under material, computational precision is very low, can appear even wrong result. And SOLID95 unit is when the mode of computational above model, as more adjacent as experimental result. Differentiate in the model accordingly reseau when, should much consideration is chosen differentiate with place reseau model is opposite answering unit. ANSYS reseau differentiates the function is very powerful, it not only have intelligent reseau to differentiate, artificial control reseau differentiates, map, sweep sweep past, dilatory reseau delimits classify function, still have powerful reseau examination to reach modification function. The effective, choice that has hypostatic unit reasonably, differentiate reseau is the assurance that achieves high accuracy result. Accordingly, while adroitness uses this software function, combinative project is actual, the unit selection method when ceaseless summary masters reseau to differentiate, skill is very beneficial. CNC Milling CNC Machining