Strain gauges used in the mechanical testing of bones Part III: Strain analysis, graphic determination of the neutral axis

Injury ◽  
1999 ◽  
Vol 30 ◽  
pp. SA21-SA25 ◽  
Author(s):  
J. Cordey ◽  
E. Gautier
Keyword(s):  
Mechanical Testing ◽  
Strain Analysis ◽  
Neutral Axis ◽  
Strain Gauges ◽  
Graphic Determination

The application of moiré rotational mismatch techniques to strain analysis

1967 ◽  
Vol 2 (2) ◽  
pp. 99-108 ◽  
Author(s):  
A P Vafiadakis ◽  
J H Lamble
Keyword(s):  
Cast Iron ◽  
Strain Analysis ◽  
Tensile Tests ◽  
Strain Gauges ◽  
Parallel Lines ◽  
Axial Tensile ◽  
Rotational Mismatch ◽  
Moiré Techniques ◽  
Compressive Tests

Theoretical and technological aspects of moiré fringe techniques when applied to problems of strain analysis are discussed. An outline is given of the methods of determination of direct and shear strain distributions of elastic and plastic orders of magnitude from the formation of moiré patterns resulting from the superposition of two gratings of straight parallel lines. The rotational mismatch technique is discussed and shown to give strain directly. Reference is made to the use of master gratings, to the ‘photo-resist’ and ‘stripping film’ techniques for the reproduction of these gratings and to some of the photographic difficulties encountered. The advantages of the moiré techniques over conventional methods of strain evaluation employing extensometers, strain gauges and photoelastic materials are discussed and illustrated by results obtained during (1) uni-axial tensile tests on mild steel, brass and aluminium alloy, and (2) diametral compressive tests on cast iron discs.

DESTRUCTIVE METHODS FOR DETERMINING RESIDUAL STRESSES (review)

2021 ◽  
pp. 95-104
Author(s):  
A.D. Monakhov ◽  
◽  
N.O. Yakovlev ◽  
V.V. Avtaev ◽  
E.A. Kotova ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Residual Stresses ◽  
Speckle Interferometry ◽  
Image Correlation ◽  
Strain Gauges ◽  
Contact Method ◽  
Layer By Layer ◽  
Deep Hole ◽  
Destructive Methods

The paper presents an overview of methods for determining residual stresses. Methods such as splitting and segmentation, layer-by-layer removal, slitting (cutting, pliability), profiling, drilling holes (including a «deep» hole) are considered. The description of the methods for mea-suring the deformation used in the determination of residual stresses is given. The most common contact method using strain gauges, as well as non-contact methods: polarization-optical (photo-elasticity), optical speckle interferometry, digital image correlation.

Simulation of stress and strain analysis on a delimbing knife with replaceable cutting edge

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 3799-3808
Author(s):  
Ján Melicherčík ◽  
Jozef Krilek ◽  
Pavol Harvánek
Keyword(s):  
Finite Element Method ◽  
Stress Analysis ◽  
Cutting Force ◽  
Woody Plants ◽  
Strain Analysis ◽  
Cutting Edge ◽  
Stress And Strain ◽  
Cutting Knife ◽  
Basic Parameters

This study focused on stress and strain analysis of the cutting force of a branch knife with a replaceable cutting edge. The replaceable edge forms part of the delimbing head, which is applied to the arms of a mechanical harvester working in forestry. Basic parameters of the knife and head of the harvester with the basic calculations necessary to determine the number of knives based on input parameters, such as wood diameter, woody plants, and determination of the cutting force acting on the cutting knife, were examined. Based on the cutting force and the design of the special cutting knife, a stress analysis and a finite element method (FEM) was performed. This study confirmed the correctness of the selected material to produce the delimbing knife, which was designed using a replaceable cutting edge. The output of the stress analysis is reported.

scholarly journals Curable Area Substantiation of Self-Healing in Concrete Using Neutral Axis

2019 ◽  
Vol 9 (8) ◽  
pp. 1537 ◽  
Author(s):  
Choonghyun Kang ◽  
Taewan Kim
Keyword(s):  
Neutral Axis ◽  
The Self ◽  
Strain Gauges ◽  
Self Healing ◽  
Distinct Area ◽  
Before And After ◽  
Strength And Stiffness ◽  
Underlying Mechanisms ◽  
Healing Assessment ◽  
Physical Recovery

The self-healing nature of concrete has been proved in many studies using various methods. However, the underlying mechanisms and the distinct area of self-healing have not been identified in detail. This study focuses on the limits of the area of self-healing. A bending specimen with a notch is used herein, and its flexural strength and stiffness before and after healing are compared and used for self-healing assessment. In addition, the neutral axis of the specimen was measured using successive strain gauges attached to the crack propagation part. Although the strength and stiffness of the concrete recovered after self-healing, the change in the location of the neutral axis before and after healing was insignificant, which indicates that physical recovery did not occur for once-opened crack areas.

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