有Chang求三维杆单元几何非线性分析matlab代码

Question

有Chang求三维杆单元几何非线性分析matlab代码，算法利用荷载的增量迭代法。价格可以私，希望可以给写一下，有二维的做参考也可以

Answer 1

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您可以使用下面的代码来实现三维杆单元的几何非线性分析：

% Define the geometry of the bar element
L = 1; % length of the bar
A = 0.01; % cross-sectional area
E = 200e9; % Young's modulus
I = (1/12)*A*L^3; % second moment of area

% Define the load applied to the bar element
P = 1e6; % load magnitude

% Define the number of increments for the load
n = 10;

% Define the increment size for the load
dP = P/n;

% Initialize variables to store the deformed shape of the bar
u = zeros(n+1,1); % displacement
x = zeros(n+1,1); % position

% Initialize the iteration loop
for i = 1:n
    % Calculate the displacement for the current load
    u(i+1) = (P/A)*(L^2/(2*E*I))*((L^2/6) - (x(i)^2)/2);
    
    % Calculate the position of the deformed shape
    x(i+1) = x(i) + u(i+1);
    
    % Update the load
    P = P - dP;
end

% Plot the deformed shape of the bar
plot(x,u);
xlabel('Position');
ylabel('Displacement');

请注意，这是一个简化的示例代码，可能需要进一步修改以适应您的具体需求。