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Shrink-fitting 第10章 薄肉圧力容器 基本例題10.09 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 2023-12-19

パイソニスタの方へ
・整数の丸めを教えて下さい。
-222.0 → -222
278.0 → 278

オリジナル

基本例題10.09 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。??? 

sympyで

from sympy import *
from decimal import Decimal, ROUND_HALF_UP

var('α2,ΔT,D,ΔD',real=True)
var('σt1,E1,t1' ,real=True)
var('σt2,E2,t2' ,real=True)
def myRound0(x):
    y = Decimal(str(x))
    a = y.quantize(Decimal('0'), rounding=ROUND_HALF_UP)
    return a

eq1=Eq(σt1,-E1/(1+E1*t1/(E2*t2))*ΔD/D)
eq2=Eq(σt2, E2/(1+E1*t1/(E2*t2))*ΔD*t1/ (D*t2)     )
rep={D:100,ΔD:0.25,t1:2.5,t2:2.0,E1:200*10**9,E2:200*10**9}  ;print("#",rep)
eq1=Eq(eq1.lhs,myRound0(eq1.rhs.subs(rep)/1000000))           ;print("#",eq1)
eq2=Eq(eq2.lhs,myRound0(eq2.rhs.subs(rep)/1000000))           ;print("#",eq2)
# {D: 100, ΔD: 0.25, t1: 2.5, t2: 2.0, E1: 200000000000, E2: 200000000000}
# Eq(σt1, -222.0)
# Eq(σt2, 278.0)

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)

いつもと違うおすすめです。

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