重磁异常正演fortran代码

说明：  基于hill本构模型和各向同性强化的MMC 伤害准则的vumat实现(hill yield+isotropic hardening+MMC damage vumat)

The model simulates transitional ductile to brittle fracture in steels using Rousselier s damage model for ductile fracture and the fracture stress (maximum principal stress) criterion for transganular cleavage.

abaqus子程序fric摩擦材料clough-duncan模型，二三维通用，已经验证(abaqus subroutine frictional material fric)

计算传热与流动的程序，用梯形网格来离散结构，通过迭代求解动量方程的压力场和速度场，再耦合能量方程来求解温度场。

sod激波管是经典的黎曼问题，计算流体力学基础问题之一。该例子使用一维结构网格，采用有限差分法，时间积分上应用三阶荣格库塔时间积分，求得激波管中密度，速度，压力的变化曲线。

说明：  berkeley加州大学SAP系列软件之SolidSAP，由Edward L.Wilson教授开发的三维结构源程序，功能强大，代码清晰，含学习手册。(SolidSAP, a three-dimensional structure source program developed by Professor Edward L. Wilson, is a software of the SAP series at the University of California, Berkeley. It has powerful functions, clear code and learning manual.)

UMAT in ABAQUS for Mazar s model of concrete damage

说明：  ABAQUS 损伤实例，非常实用的教程，适合于初学者。(ABAQUS. adj;lng;la jlah; jiang shang alhgln;glna;lg)

Code source of Finite Element Analysis with Error Estimators

利用双线性Z变换设计巴特沃斯和切比雪夫I型IIR数字滤波器，包括低通、高通、带通、带阻四种形式。使用者只需指定通带、阻带的边缘实际频率及相应的衰减，便可输出数字滤波器 的级联形式的各子系统分子、分母的系数，并输出其幅频和相频响(Bilinear Z transform design Butterworth and Chebyshev Type I IIR digital filters, including low pass, high pass, band pass, band stop four forms. Users simply specify the passband edge frequency stopband actual and corresponding attenuation subsystems can form molecular cascade output digital filter coefficients of the denominator, and the output of its magnitude and phase frequency response)