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圧力容器の直径の変化量 第10章 薄肉圧力容器 基本例題10.04 p338「材料力学演習(20221021)」をsympyでやってみたい。(英:thin wall structure)

Last updated at Posted at 2023-12-18

オリジナル

基本例題10.04 p338「材料力学演習(20221021)一括(ver.3.3)」を勉強したい。#sympy
          ???タブレット等で、pdfを開く事ができないかも。??? 
←基本例題10.01 p335

sympyで

from sympy import *

var('εt,D,ΔD'      ,real=True)
var('σt,σx,v,E,p,t',real=True)
def myEq_RepLR(eq):
     return {eq.lhs:eq.rhs}
eq1=Eq(εt,(pi*(D+ΔD)-pi*D)/(pi*D))           ;print("#",eq1)
eq1=Eq(eq1.lhs,eq1.rhs.simplify())           ;print("#",eq1);print()
# 
eq2=Eq(εt,σt/E-v*σt/E)                       ;print("#",eq2)
rep=myEq_RepLR( Eq(σt,D*p/(2*t)))           #;print(rep)
eq2=Eq(eq2.lhs,eq2.rhs.subs(rep).factor())   ;print("#",eq2);print()
# 
ans=solve(eq1,ΔD)[0]                         ;print("#",ans)
eq3=Eq(ΔD,ans)                               ;print("#",eq3)
rep=myEq_RepLR(eq2)                         #;print(rep)
eq3=eq3.subs(rep)                            ;print("#",eq3)
# Eq(εt, (-pi*D + pi*(D + ΔD))/(pi*D))
# Eq(εt, ΔD/D)

# Eq(εt, -v*σt/E + σt/E)
# Eq(εt, -D*p*v/(2*E*t) + D*p/(2*E*t))
# Eq(εt, -D*p*(v - 1)/(2*E*t))

# D*εt
# Eq(ΔD, D*εt)
# Eq(ΔD, -D**2*p*(v - 1)/(2*E*t))

いつもの? sympyの実行環境と 参考のおすすめです。

(テンプレート)

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