Characteristic Entities in PhotoStress Method

Frankovský, Peter; Trebuňa, František; Kostka, J.; Šimčák, František; Ostertag, Oskar; Papacz, Władysław

doi:10.12691/ajme-2-7-13

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…The difference between these values is 3.6%, which means that the experimental measurement was relatively precise. The works [ 20 , 21 , 22 , 23 , 24 ] emphasize that the use of an elasto-optical coating of the surface layer allows quantitative and qualitative analysis of the direction and magnitude of principal stresses and strains as a response to pressure loads on various structural components. Due to the versatility of this method, it can be used in many ways in various aspects of engineering projects, analysis of solutions to architectural structures, development of prosthetic implants, development of structural components of aircraft, machinery, etc.…”

Section: Methodology Of Stress and Strain Analysis Applied To Castingsmentioning

confidence: 99%

The Formation of the Strength of Castings including Stress and Strain Analysis

Maj

2024

Materials

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This article presents some views on the subject of self- or residual stresses, trying to clarify some erroneously seemingly ingrained formulations in the introduction, which are widely used in castings and their classification (thermal, shrinkage, and phase stresses). For example, the location of their occurrence is often not specified, nor in which cross sections (volumes) they balance. In thin bars there are uniaxial stresses and in thin plates, stresses in two orthogonal directions are considered, while in castings, which are always three-dimensional objects, stresses in all planes should be considered. Meanwhile, to make matters worse, the complexity of calculations and possible experiments is rapidly increasing from the 1-axis to the 3-axis condition. A detailed analysis is made of how tensile and compressive stresses are calculated as a function of casting wall thickness, taking into account heat flow between walls of different thicknesses. The article presents selected methods of stress and strain testing, with particular emphasis on elasto-optical testing.

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Section: Methodology Of Stress and Strain Analysis Applied To Castingsmentioning

confidence: 99%

The Formation of the Strength of Castings including Stress and Strain Analysis

Maj

2024

Materials

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“…Each row describes three strains acting on a plane that is aligned with one of the global coordinate axes. This data enables the three principal strain magnitudes to be determined (𝜀 𝒋 , 𝑗 = 1,2,3) in addition to their orientation [49,50]. This is done in Matlab by calculating the eigenvalues and eigenvectors respectively.…”

Section: Lattice Generation Based On Principal Strain Trajectoriesmentioning

confidence: 99%

Design concepts for generating optimised lattice structures aligned with strain trajectories

Daynes

Feih

et al. 2019

Computer Methods in Applied Mechanics and Engineering

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Additively manufactured lattice structures enable the realisation of light-weight, multifunctional, structures. For example, lattices can be used for high stiffness and buckling resistance in sandwich structures or as support material for additive manufacturing. Topology optimisation and additive manufacturing are two technologies that allow the design, optimisation and manufacture of complex lattice designs. In this work, a new lattice optimisation methodology is presented that tailors the size, shape and orientation of individual lattice trusses in threedimensional space by using principal strain fields obtained from topology optimisation. This new method of generating functionally graded lattices is shown both numerically and experimentally to be capable of generating lattice structures with greatly improved stiffness and strength when compared to lattice structures with a uniform lattice infill. Upper and lower relative density thresholds and minimum truss member sizes are included in the optimisation workflow to ensure that the optimised lattice designs are compatible with additive manufacturing process constraints. The functional grading method is also shown to be capable of generating conformal lattice structures in three dimensions, even for complex loading conditions and arbitrary volume boundaries.

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“…A reflection polariscope is used to monitor and measure the surface strains on the photoelastically coated test component for PhotoStress analysis. The number N is known as fringe order and illustrates the size of δ as shown in table 1 (Frankovský et al, 2014). Once the 𝛿 = 𝑁λ is known, the principal strain difference is found by:…”

Section: Introductionmentioning

confidence: 99%

Using the Photostress method to determine the residual stresses

Alzyod¹,

Ficzere

2022

IJEMS

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Strains and stresses in loaded and photoelastically coated structural members can be determined using the PhotoStress method. The quantitative values of variations in the principal strains (stresses) and their directions could be employed to get the strain or stress components field on the entire coated surface. In the PhotoStress experiment, isochromatic fringes give qualitative and quantitative information. It provides a source of information on the directions and magnitudes of principal strain and principal normal stress on the surface of photoelastic coated parts. This article reviews the principle of using PhotoStress analysis to measure the residual stress and provides the boundary condition of using this method.

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Characteristic Entities in PhotoStress Method

Cited by 3 publications

References 2 publications

The Formation of the Strength of Castings including Stress and Strain Analysis

The Formation of the Strength of Castings including Stress and Strain Analysis

Design concepts for generating optimised lattice structures aligned with strain trajectories

Using the Photostress method to determine the residual stresses

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