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36 lines
1.1 KiB
36 lines
1.1 KiB
%--------------------------
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% @Author: Jingqiao Hu
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% @Date: 2021-05-18 22:33:57
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% @LastEditTime: 2021-05-18 22:41:38
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%--------------------------
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function K = global_stiffness_2scale_nonlinear(F, dFdx, iK, jK, dx, global_u, global_l, lenout)
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eleNum = size(F, 2);
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sK = zeros(lenout^2, eleNum);
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jac = dx^3/8;
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for ele_ma = 1:eleNum
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u = global_u{ele_ma};
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l = global_l{ele_ma};
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% element stiffness
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ke = 0;
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for gp = 1:8
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Fe = F{gp, ele_ma}; % 4 * eleNum_mi
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dFe = dFdx{gp, ele_ma}; % 4 * lenout * eleNum_mi
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dP1 = dPdF_fast_nonlinear(u, l, Fe, dFe); % 4 * l * m
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dPT = permute(dP1, [2,1,3]); % l * 4 * m
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dP2 = reshape(dPT, lenout, []); % l * 4m
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dF1 = permute(dFe, [2,1,3]); % l * 4 * eleNum_mi
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dF2 = reshape(dF1, lenout, [])'; % 4m * l
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ke_g = dP2 * dF2; % lenout * lenout
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ke = ke + ke_g * jac;
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end
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sK(:, ele_ma) = ke(:);
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end
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K = sparse(iK, jK, sK(:));
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K = (K + K')/2;
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end
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