Category Archives: Stress Analysis

Stress Analysis

Stress–strain analysis (or just stress analysis, for short) is an engineering discipline covering methods to determine the stresses and strains in materials and structures subjected to forces or loads.

2.6. Calculation of Elastic Constants

1 . Analysis of the Orthotropic Lamina 1.1. Introduction 1.2. Hooke’s Law 1.3. Relationships between elastic constants and Elasticity Matrix  1.4. Matrix of Elasticity   2. Classical theory of Laminates 2.1. Introduction 2.2. Basic Formulas 2.3. Laminate stiffener matrix 2.4. Calculation … Continue reading

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2.5. Thermal Stress

1 . Analysis of the Orthotropic Lamina 1.1. Introduction 1.2. Hooke’s Law 1.3. Relationships between elastic constants and Matrix of Elasticity 1.4. Matrix of Elasticity   2. Classical theory of Laminates 2.1. Introduction 2.2. Basic Formulas 2.3. Laminate stiffener matrix 2.4. … Continue reading

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2.4. Calculation of Stress and Strain

1 . Analysis of the Orthotropic Lamina 1.1. Introduction 1.2. Hooke’s Law 1.3. Relationships between elastic constants and Matrix of Elasticity 1.4. Matrix of elasticity   2. Classical theory of Laminates 2.1. Introduction 2.2. Basic Formulas 2.3. Laminate stiffener matrix 2.4. … Continue reading

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Contact simulation with MSC/Nastran

Linear Gap The linear GAP is the simpliest contact form used in Nastran simulations. Linear GAP can solve a large class of problems like hole bearing, heel-toe interaction, fitting contacts. Linear, therefore does not include frition, large displacements, and material … Continue reading

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Non linear Buckling with FEM approach

Buckling analysis assesses the stability characteristics of a structure. An accurate solution to a buckling problem requires more efforts than just following a numerical procedure, there are a number of factors to consider before a buckling solution can be accepted … Continue reading

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Buckling of an imperfection-sensitive cylindrical shell

Buckling of an imperfection-sensitive cylindrical shell (EXTRACTED FROM ABAQUS GUIDE) This example serves as a guide to performing a postbuckling analysis using Abaqus for an imperfection-sensitive structure. A structure is imperfection sensitive if small changes in an imperfection change the … Continue reading

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Nastran run in batch mode

Sometimes is necessary to perform several Nastran runs, and by running one by one could be necessary a lot of time. Hereafter are illustrated two methods to speed up these operations. There is an effective method to perform this operation … Continue reading

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Nastran launch commands

The Nastran solver is executed usually by command line like „nastran“. Generally it could be with different name,  due to the needs to specify the version of solver. The format nastran command is:   nastran2012  input_file  keyword1 = value1  keyword2 … Continue reading

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Random Vibration Analysis – Nastran SOL 111

Introduction Random vibration is motion which is non-deterministic, meaning that future behavior cannot be precisely predicted, and it is a characteristic of the input or excitation.  To specific a random vibration is usually is used the ASD (acceleration spectral density). … Continue reading

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Vibration Analysis – Nastran SOL 103

    General Overview There are many reasons to compute the natural frequencies and mode shapes of a structure.  One reason is to assess the dynamic interaction between a component and its supporting structure. For example for those parts nearby … Continue reading

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