材料力学之应变分析算法：非线性应变分析：非线性应变的数学描述.docx

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du_dx = np.gradient(u, axis=0)

du_dy = np.gradient(u, axis=1)

dv_dx = np.gradient(v, axis=0)

dv_dy = np.gradient(v, axis=1)

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E = 0.5 * (du_dx + dv_dx.T + du_dy + dv_dy.T + du_dx * dv_dx.T + du_dy * dv_dy.T)

return E

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