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Table 5 Influence of the order-approximation of \(1/\mu \)—one layer \([0^{\circ } ]\) - \(S=4\)—mesh 26 \(\times \) 10—numerical layers \(N_z = 4 \times NC\)

From: Modeling of cylindrical composite shell structures based on the Reissner’s Mixed Variational Theorem with a variable separation method

\(\varvec{\phi }\)

Expansion

Model

\(\bar{{{\varvec{u}}}}{{\varvec{(0,e/2)}}}\) max

\(\bar{{{\varvec{w}}}}{{\varvec{(L,0)}}}\)

\(\bar{\varvec{\sigma }}_{{{\varvec{11}}}}{{\varvec{(-e/2)}}}\)

\(\bar{\varvec{\sigma }}_{{{\varvec{13}}}}{{\varvec{(0)}}}\)

\(\bar{\varvec{\sigma }}_{{{\varvec{33}}}}\) max

\(\phi =\pi /8\)

Zero-order

VS-LM4

\(-\) 0.0085

0.0211

\(-\) 0.2094

0.1415

1.0027

Error

9.30%

11.86%

21.63%

11.44%

0.27%

One-order

VS-LM4

\(-\) 0.0096

0.0243

\(-\) 0.2694

0.1621

1.0103

Error

2.59%

1.30%

0.82%

1.48%

1.03%

Two-order

VS-LM4

\(-\) 0.0095

0.0241

\(-\) 0.2670

0.1616

1.0023

Error

1.72%

0.46%

0.09%

1.14%

0.23%

Exact

\(-\) 0.0094

0.0240

\(-\) 0.2673

0.1597

1.0000

\(\phi =\pi /3 \)

Zero-order

VS-LM4

2.3664

0.2797

\(-\) 1.0442

0.5119

1.0101

Error

10.39%

10.32%

21.54%

10.80%

1.01%

One-order

VS-LM4

2.6764

0.3160

\(-\) 1.3518

0.5766

1.0221

Error

1.35%

1.30%

1.57%

0.49%

2.21%

Two-order

VS-LM4

2.6411

0.3119

\(-\) 1.3329

0.5720

1.0110

Error

0.01%

0.02%

0.16%

0.32%

1.10%

Exact

2.6408

0.3120

\(-\) 1.3309

0.5739

1.0000