Moiré Fringes in Strain Analysis

The Commonwealth and International Library: Applied Mechanics Division

1st Edition - January 1, 1969
Author: Pericles S. Theocaris
Editor: J. Sved
Language: English
eBook ISBN:
9 7 8 - 1 - 4 8 3 1 - 3 6 0 6 - 6

Moiré Fringes in Strain Analysis provides a comprehensive description of the entire spectrum of techniques and methods using the moiré fringe phenomenon for the measurement of… Read more

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Moiré Fringes in Strain Analysis provides a comprehensive description of the entire spectrum of techniques and methods using the moiré fringe phenomenon for the measurement of strains in engineering structures and in deformed bodies. This book presents several examples of applications of each technique to particular metrological problems. Organized into 12 chapters, this book begins with an overview of the interference fringes between two beams of monochromatic light. This text then discusses the theory of moiré patterns developed by various types of gratings based on the indicial representation method. Other chapters consider the experimental and theoretical investigation of the properties of moiré fringes that was primarily confined to moiré fringes formed by the interference of two-line gratings. This book discusses as well the major requisite for the application of moiré methods in the field of strain analysis. The final chapter deals with the advantages of the moiré methods. This book is a valuable resource for engineers, students and researchers.

Preface

Chapter 1. General Theory

1.1. Introduction

1.2. Nature of the Moiré Phenomenon

1.3. Mathematical Analysis of Moiré Fringes

Chapter 2. Moiré Patterns Formed by Line Gratings

2.1. Indicial Representation of Moiré Patterns

2.2. Measurement of the Components of Strain

2.3. Measurement of Large Strains

2.4. The Linear Differential Moiré Method

2.5. Direct Tracing of Isoentatics

2.6. The Angular Disparity Moiré Method

2.7. The Grid-Analyzer Moiré Method

2.8. Fractional Moiré Fringes by the Light Intensity-Displacement Law

2.9. Fractional Moiré Fringes by Isodensitracing

Chapter I . Moiré Patterns Formed by Circular, Radial and Zone Gratings

3.1. Moiré Patterns Formed by the Superposition of Equispaced Concentric Circular Gratings

3.2. Moiré Patterns Formed by Combinations of Circular, Radial and Line Gratings

3.3. Moiré Patterns Formed by Radial Gratings

3.4. Moiré Patterns Formed by Zone Gratings and Equispaced Line Gratings

3.5. Determination of the Strain Components From Moiré Fringes

Chapter 4. Applications of Line Gratings to Two-dimensional Strain Measurement

4.1. The Equal-Pitch Moiré Method Applied to Strain Distribution of a Necked Tensile Sheet Specimen

4.2. The Linear Differential Moiré Method Applied to the Study of Stress-strain Curves of Metals

Chapter 5. Moiré Patterns Formed by Remote Gratings

5.1. Transmitted Image Moiré Patterns of Slope Contours of the Sum Of Principal Stresses

5.2. Multisource Moiré Patterns of Slope Contours of the Sum Of Principal Stresses

5.3. The Slit Source and Grating Moiré Method in Plane Stress Problems

5.4. Curvature Distributions Obtained by Frequency Modulated Amplitude Gratings

5.5. Moiré Patterns Formed by Inclined Gratings

Chapter 6. Surface Topology by Moiré Patterns

6.1. Isopachic Patterns by the Shadow Moiré Method

6.2. The Oblique Shadow Moiré Method for Measurement of Deflections in Plates

6.3. Ligtenberg's Photoreflective Moiré Method for Recording Slopes

6.4. The Photoreflective Moiré Method for the Evaluation of Principal Moment and Stress Directions

6.5. The Salet-Ikeda Moiré Method for the Determination of Partial Slopes in Flexed Plates

6.6. The Reflected Image Moiré Method for Recording Slope Contours in Flexed Plates

6.7. The Multisource and the Slit Source and Grating Methods for Recording Slope Contours in Plates

Chapter 7. Applications of Moiré Methods to Dynamic Problems

7.1. The Moiré Methods Applied to Vibration Problems

7.1.1. The Dispersion Method of Parallel Light Beam

7.1.2. The Reflected Image Moiré Method

7.1.3. Ligtenberg's Photoreflective Method Extended to Vibrations Of Membranes

7.2. The Moiré Methods Applied to Transient Strain Distributions

7.3. The Linear Differential Moiré Method Applied to Shock Wave Propagation

Chapter 8. The Moiré Methods Applied to Curved Surfaces

8.1. The Oblique Shadow Moiré Method for the Study of Curved Surfaces

8.2. The Reflected Image Moiré Method for the Study of Slope Contours in Shells

8.3. Hologrammetry Used for Recording Partial Slopes of Plates and Shells

Chapter 9. Moiré Extensometers

9.1. Wiemer's Moiré Extensometer

9.2. Crisp's Moiré Goniometer

9.3. Moiré Extensometers Based on Angular Disparities

9.3.1. Linge's Moiré Extensometer

9.3.2. Diruy's Moiré Extensometer

9.3.3. Vafiadakis' Moiré Extensometer

Chapter 10. Precision and Influence of Grating Defects

10.1. Precision

10.2. Influence of Grating Defects on Moiré Fringes

10.2.1. Influence of a Lateral Deformation of the Gratings

10.2.2. Influence of a Non-Coincidence of the Planes of Reference and Specimen Gratings

10.2.3. Influence of An Angular Displacement of the Reference Grating

10.2.4. Influence of Periodic Irregularities of Gratings

Chapter 11. Technological Information On Reproduction Techniques of Gratings

11.1. Production of Large Field Gratings

11.2. Reproduction of Gratings to Specimens

11.3. Photographic Equipment and Materials

Chapter 12. Evaluation of Moiré Methods

References

Author Index

Subject Index