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Evaluate the stiffness matrix for the CST element shown below. Co-ordinates are given in mm. Assume plane stress condition. Thickness 10mm, E = 200 GPa nd v = 0.3
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written 7.0 years ago by | • modified 6.9 years ago |
E=200GPa, v=0.3, t=10mm
Now x1,y1=10,20
x2,y2=70,20
x3,y3=40,60
β1=y2−y3=20−60=−40
β2=y3−y1=60−20=40
β3=y1−y2=20−00=0
γ1=−(x2−x3)=−(70−40)=−30
γ2=−(x3−x1)=−(40−10)=−30
γ3=−(x1−x2)=−(10−70)=60
2A=|1x1y11x2y21x3y3|=|110201702014060|
=1(70∗60∗−40∗20)−10(60−20)+20(40−70)
=3400−400+(−600)
∴2A=2400mm2
[B]=12A[β10β20β300γ10γ20γ3γ1β1γ2β2γ3β3]
[B]=12400[−400400000−300−30060−30−40−3040600]
[B]=[−0.016700.01670000−0.01250−0.012500.025−0.0125−0.0167−0.01250.01670.0250]
[B]T=[−0.01670−0.01250−0.01250.01670.01670−0.01250−0.01250.0167000.02500.0250]
Plane-Stress …
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