Use of CAE-Systems at Evaluation of Shock Absorbers for Metallurgical Equipment

Work presents results of strength calculations of absorber elastic element that were done by CAE-system and standard method of calculating. It is shown, that use of FEM software allows studying thoroughly the distribution of appropriate stresses on surfaces of elastic element.


Introduction
At current economic conditions it is necessary to design new equipment during short terms in order to increase its competitiveness.There are a lot of different features of FEM calculations done for big complex and sometimes unique details [1][2][3][4][5].Mathematical model (MM) which is a basis for any technical task in CAE-system (Computer -Aided Engineering system) should be universal with possibility to change numerous parameters.The most popular MM is one which is created by means of CAD-system (Computer -Aided Design system) with FEM [6][7][8][9].

Materials and Methods
According to authors of this article, preferred CAE-system for making design and stress calculations of metallurgical equipment might be SolidWorks -COSMOSWorks.In addition, some key producers of metallurgical heavy machinery use SolidWorks -COSMOSWorks [10,11].Also, it is well known about stress calculations of details from different steel grades [12][13][14] but there is a lack of information about use of FEM for stress calculations of absorbers elastic elements of metallurgical equipment [15][16][17][18].
Example of elastic elements FEM stress calculation is given below.It is done for elastic strip (polyurethane grade adiprene L-167), which is a part of absorber for equipment base installed on foundation.Sketch of elastic strip is shown on fig. 1.
a Corresponding author : artiukh@mail.ruBoundary conditions were done according to recommendations [12] such as zero movement of surfaces normal to their face (refer to fig. 3).Stress calculation sequence of the absorber strip was done according to recommendations [7,11], that made it possible to clarify dimensions of elements equal to 1mm with tolerance of 0.05mm, amount of mesh nodes is 703049; amount of mesh elements is 494837.
Calculation results of normal stress in X-axis (SX direction) are shown on fig.V is possible to compare with allowable stress of polyurethane [19] which can be equal to: It confirms fulfillment of strength stipulation Shown stress calculation of the elastic strip can be compared to theoretical/standard calculation shown in [20].Geometrical characteristics of the strip with three equal round holes are taken into account.Scheme that describes interconnection of FEM and theoretical calculations is shown on fig.5, where А Т SX V is normal stress in point A acting in X-axis on surface of the strip contour, i.e. geometrical position of node number 693380 of MM and point A of theoretical calculation are coincide.It means they have the same stress Deviation of results of FEM and theoretical calculations is  Maximum stress in i-point of lateral surface: where 975 , 2 А Т K -coefficient when taking into account dimensions of strip and amount of uniform round holes [20].Results of FEM and theoretical stress calculations of absorber strip are given in table 1. make relationships between parameters of elasticity theory and set of design features of developed elastic elements for absorbers of metallurgical equipment.

DOI: 10 Figure 1 .
Figure 1.Sketch of the elastic strip from polyurethane grade adiprene L-167.MM was created in SolidWorks -COSMOSWorks for making stress calculation of the elastic strip from polyurethane grade adiprene L-167.The MM strip has particular design and material properties (elastic modulus E = 60 МPа, Poisson's ratio μ = 0,495).The elastic strip undergone by compressive force.Maximum loading of the strip during usage of absorber is equal to its uniform shrink by 2 mm.Scheme of the strip loading is shown on fig. 2.

Figure 2 .
Figure 2. Scheme of the absorber strip loading by deformation in MM.

Figure 3 .
Figure 3. Loading scheme of the strip.
of normal stress in i-point of lateral surface acting in particular direction.

Figure 4 .
Figure 4. Distribution of normal stress acting in X-axis in the absorber strip.

Figure 5 .
Figure 5. Interconnection scheme of FEM and theoretical calculations.

Table 1 .
Analyses results of ММ and theoretical stress calculation.
According to described above and values in table 1 it is clear that use of CAD-systems allows to MATEC Web of Conferences 01039-p.4