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ABAQUS+UMAT+FORTRAN
ABAQUS中用户材料子程序UMAT的开发主要解决两方面的问题：本构模型的建立和积分算法的选择。
本文主要研究非线性材料的UMAT实现方法，并重点研究其迭代算法部分，目前，用户材料子程序UMAT的迭代算法主要是常刚度法，常刚度法的优点在于算法原理较简单，程序编写较方便，缺点是当遇到复杂非线性材料时，其迭代次数较多，收敛速度也较慢，在这个情况下，本文采取的是一种迭代次数较少且收敛速度较快的切线刚度法，具体就是采用FORTRAN语言编制了基于Von-Mises模型的接口程序,并采用切线刚度算法，通过与ABAQUS自带本构关系计算的结果相比较，验证其正确性。(This paper studies the user subroutine UMAT of ABAQUS development methods, the use of FORTRAN language isotropic hardening material model of the interface program, studied the effects of such material is extremely elastic-plastic constitutive relation method.
This article UMAT tightly around the secondary development of technology, the first principle of its interface detail, and then for the theory of nonlinear finite element incremental stiffness of the regular tangent stiffness method and the theory of algorithms to do an in-depth analysis of deduced a regular tangent stiffness and rigidity of the law of the specific expression of algorithm theory, and then the preparation of the two algorithms, respectively, of the UMAT program, and finally the establishment of a specific model checking, bringing with ABAQUS elasto-plastic constitutive relation of the calculated results compared to verify the correctness of the two.)
- 2020-12-05 21:59:24下载
- 积分：1
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01717763
说明： 这是简绍耦合矩阵的，为多通带的计算方法，可以方便的设计多通带微带滤波器，(This is Jane Shao coupling matrix for the multi-band calculation method, you can easily design multi-band microstrip filter)
- 2011-03-10 15:50:57下载
- 积分：1
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jifen
各种数值积分，龙贝格积分。反常积分。高斯积分。三重积分。(Various numerical integration Romberg integration. Improper integrals. Gaussian integral. Triple integral.)
- 2012-12-02 15:54:40下载
- 积分：1
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数值分析实验
数值分析实验1.明确插值多项式和分段插值多项式各自的优缺点；
编程实现拉格朗日插值算法，分析实验结果体会高次插值产生的龙格现象；(Experiments of numerical analysis 1. Define the advantages and disadvantages of interpolation polynomials and piecewise interpolation polynomials. The Lagrange interpolation algorithm is programmed, and the Runge phenomenon produced by high-order interpolation is analyzed.)
- 2019-04-30 22:30:36下载
- 积分：1
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CompDam_DGD
摩擦力是抵抗固體表面，流體層和材料元件相對滑動的相對運動的力。有幾種類型的摩擦：幹摩擦是一種與之相反的力(friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the)
- 2020-06-23 10:00:01下载
- 积分：1
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test_read_file
实现了对文档的数据读入，实现了文档的数据读入(The realization of the document data read into, The realization of the document data read into, )
- 2013-08-14 02:15:23下载
- 积分：1
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UMAT_Hashin3D_T-N
基于ABAQUS的hashin和Tong-Norrius准则的umat子程序(Umat subroutine based on the Hashin and Tong-Norrius guidelines of ABAQUS)
- 2020-10-26 23:00:00下载
- 积分：1
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pre-distortion
针对功放得到非线性失真，采用查表法预失真对功放的非线性进行补偿，仿真表明了补偿方式的有效性。(Obtained for nonlinear distortion amplifier, using the look-up table predistortion to compensate for non-linear power amplifier, simulation shows the effectiveness of compensation.)
- 2013-11-20 16:15:34下载
- 积分：1
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DisplayFFTResult
电弧炉对电网影响仿真软件，希望对大家有所帮助(EAF impact on the power grid simulation software, want to help everyone)
- 2021-04-26 18:08:45下载
- 积分：1
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dofft
说明： 用于对ADC采集正弦波后得到的数据进行FFT，计算得到ADC的动态性能参数(ADC DYNAMIC TEST(FFT))
- 2019-10-28 16:00:30下载
- 积分：1
