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Problem (6.1):
Alum
E1=71 GPA
α1=23*10^-6 Ѵ=0.3
capper
E2=119Gpa
α2=170*10^-6
▲=1-V12^2 *(E2/E1)
▲=0.842
Q11=(E1/▲)=71/0.842=83.521
Q12=Q21=V12 *(E2/▲)
Q12=42.032
Q22=E2/▲=140.164
At Ө1=0
Q11''=Q11=83.521
Q12''=42.032
Q22''=140.164
Q16''=0
Q26''=0 Q66''=Q66=G12
E1=Ef Vf+Em Vm
71= E1=Ef Vf+Em Vm
E2=Em Ef/VfEm+VmEf=119
1 E1=Ef Vf αf+Em Vm αmα
Aij=∑(Qij''(Zk-Zk-1))
A11=0.3345
A12=Q12'' * .004=0.1681
A22=.5606 A16=0 A66=0.004 G12 A26=0
Bij=0.5 ∑Qij''k (Zk^2-Zk-1^2)
B11=.00032
B12=.000168
B22=.00056
)Problem (6.2
U0=A cos(αx) sin(By)
V0=B sin(αx) cos(By)
Φx=Q cos(αx) sin (By)
Φy=R sin(αx)cos(By)
U=Uo(x.y)-Zϕx
V=Vo-Z(ϕy)
Xx=∂uo/∂x-z∂ϕx/∂x€
∂uo/∂x=-Aα sin By sin αx
∂ϕx/∂x=-QBsinBysinαx
€xx=(zQB-Aα)sin By sin αx
€yy=∂vo/∂y-z∂ϕy/∂y
€yy=(zRB-BB)sin (By)sin(αx)
€xy=€0xy+zkxy
€0xy=0.5 cos αx cos By (AB+BB)
Kxy=0.5*(∂ϕx/∂y+∂ϕy/∂x)
Kxy=0.5 *cosαx *cosBy (BQ+αR)
W= c sin αx sin By
Problem (6.5)
Nx=1 t1=t2=1.27
E1=137.8Gpa E2=9.6Gpa G12=5.2 v12=.3
Ex=1/tα11=(A11A22-A12^2/tA22)
Ey=1/tα22=(A11A22-A12^2/tA11)
Gxy=1/tα66=A66/t
Vxy=A12/A22
▲=1-v12^2 *E2/E1
▲=0.9832
Q11=138.673 Q12=Q21=2.898
Q22=9.6608 Q66=5.2
AT Ө=30
Q11''=85.40 Q12''=23.91
Q22''=19.0872 Q16''=41.10
Q26''=14.753 Q66''=28.025
AT Ө=-30
Q11''=85.23 Q12''=23.821
Q22''=19.087 Q16''=-41.10
Q26''=-14.75 Q66''=28.025
Aij=∑ Qij (Zk-Zk-1)
A11=2*85.4*1.27=216.916
A12=2*23.912*1.27=60.737
A21=A12
A22=2*19.087*1.27=48.4814
A16=0 A26=0 A66=71.185
α11=A22/A11 A12-A12^2
α11=0.0036
α22=0.02074
α66=0.01404
α12=-0.001
x α11 α12 α16 Nx€
€y = α12 α22 α26 - Ny
Xy α16 α26 α66 Nxyᴕ

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Hw6

  • 1. Problem (6.1): Alum E1=71 GPA α1=23*10^-6 Ѵ=0.3 capper E2=119Gpa α2=170*10^-6 ▲=1-V12^2 *(E2/E1) ▲=0.842 Q11=(E1/▲)=71/0.842=83.521 Q12=Q21=V12 *(E2/▲) Q12=42.032 Q22=E2/▲=140.164 At Ө1=0 Q11''=Q11=83.521 Q12''=42.032 Q22''=140.164 Q16''=0 Q26''=0 Q66''=Q66=G12 E1=Ef Vf+Em Vm 71= E1=Ef Vf+Em Vm E2=Em Ef/VfEm+VmEf=119 1 E1=Ef Vf αf+Em Vm αmα Aij=∑(Qij''(Zk-Zk-1)) A11=0.3345 A12=Q12'' * .004=0.1681 A22=.5606 A16=0 A66=0.004 G12 A26=0 Bij=0.5 ∑Qij''k (Zk^2-Zk-1^2)
  • 2. B11=.00032 B12=.000168 B22=.00056 )Problem (6.2 U0=A cos(αx) sin(By) V0=B sin(αx) cos(By) Φx=Q cos(αx) sin (By) Φy=R sin(αx)cos(By) U=Uo(x.y)-Zϕx V=Vo-Z(ϕy) Xx=∂uo/∂x-z∂ϕx/∂x€ ∂uo/∂x=-Aα sin By sin αx ∂ϕx/∂x=-QBsinBysinαx €xx=(zQB-Aα)sin By sin αx €yy=∂vo/∂y-z∂ϕy/∂y €yy=(zRB-BB)sin (By)sin(αx) €xy=€0xy+zkxy €0xy=0.5 cos αx cos By (AB+BB) Kxy=0.5*(∂ϕx/∂y+∂ϕy/∂x) Kxy=0.5 *cosαx *cosBy (BQ+αR) W= c sin αx sin By
  • 3. Problem (6.5) Nx=1 t1=t2=1.27 E1=137.8Gpa E2=9.6Gpa G12=5.2 v12=.3 Ex=1/tα11=(A11A22-A12^2/tA22) Ey=1/tα22=(A11A22-A12^2/tA11) Gxy=1/tα66=A66/t Vxy=A12/A22 ▲=1-v12^2 *E2/E1 ▲=0.9832 Q11=138.673 Q12=Q21=2.898 Q22=9.6608 Q66=5.2 AT Ө=30 Q11''=85.40 Q12''=23.91 Q22''=19.0872 Q16''=41.10 Q26''=14.753 Q66''=28.025 AT Ө=-30 Q11''=85.23 Q12''=23.821 Q22''=19.087 Q16''=-41.10 Q26''=-14.75 Q66''=28.025 Aij=∑ Qij (Zk-Zk-1) A11=2*85.4*1.27=216.916 A12=2*23.912*1.27=60.737 A21=A12 A22=2*19.087*1.27=48.4814 A16=0 A26=0 A66=71.185 α11=A22/A11 A12-A12^2 α11=0.0036 α22=0.02074
  • 4. α66=0.01404 α12=-0.001 x α11 α12 α16 Nx€ €y = α12 α22 α26 - Ny Xy α16 α26 α66 Nxyᴕ