lab-1 report instructions

8/9/2019 Lab-1 Report Instructions

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SUMMARY

The ability to quantify the stress condition at a critical location in a machine element is an

important skill needed for the engineers. In this lab, students will calculate the stress and straindistributions of the thin plates with CAE tool UG/Nastran. For both plates the maximum

displacement was at the edges of the plate. Comparing the two plates plate 2 had moredeformation and displacement due to stress, this is because the was less material to spread thestress over.


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Problem Statement

For the metal plate shown in Figure 1, the width and the length of the plate are 30 and 50

mm, respectively, and the thickness of the plate is 0.5 mm. The plate has a circular hole in its

center, and the radius of the hole is 5 mm. It has Young’s Modulus of 220 GPa, and its Poisson

ratio is 0.3. Distributed loads q = 2000 Pa are applied on both ends of the plate.

For the metal plate shown in Figure 2 this plate is made with the same material, with thesame width, length and thickness as the plate shown in Figure 1; but there are two identical holeswith radius of 5mm in the middle of the plate. The center to center distance between the holes is 15

mm; the distance between the upper hole’ center and the plate upper lateral is 7.5 mm. The externalload q = 2000Pa.


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Experimental UNIT AND PROCEDURE

1.) Build the geometry model

2.) Generate meshes, applied boundary conditions and loads

3.) Find the stress and strain distribution in the plate

4.) Find out the stress concentration areas5.) Repeat the above steps for the plate shown in Figure 2.


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RESULTS AND DISCUSSION

Figure 1: Plate 1 Cut in Half

Figure 2: Plate 1 Half Meshed


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Figure 3: Displacement of Plate 1

Figure 4: Stress Deformation of Plate 1


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Figure 5: Plate 2 Cut in Half

Figure 6: Plate 2 Half Meshed


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Figure 7: Displacement of Plate 2

Figure 8: Stress Deformation of Plate 2


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CONCLUSIONS

In conclusion for plate 1 the maximum stress was found to be at the center axis of the

plates. The edges of the holes is where the maximum deformation also occurred which one could

expect since that is where the stress was the highest. For the second plate the maximum stress

was at the center of the plate just like plate 1 and, the maximum deformation for plate is still atthe edges of the holes. For both plates the maximum displacement was at the edges of the plate.

Comparing the two plates plate 2 had more deformation and displacement due to stress, this is because the was less material to spread the stress over.


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REFERENCES

1. Shigley's Mechanical Engineering Design, Budynas and Nisbett, 8th Ed., McGraw-Hill, 2006.

lab-1 report instructions

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