A review of using thermoelasticity for structural integrity assessment

Marșavina, Liviu; Tomlinson, R. A.

doi:10.3221/igf-esis.27.02

Cited by 3 publications

(4 citation statements)

References 15 publications

(32 reference statements)

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“…This kind of loading can be achieved in scenarios I and IV while the loafing exceeds 100 N. A sudden torsion failure is not likely to happened for daily routine loads up to 5 N·m. Fatigue fracture, on the other hand, may occur in all loading scenarios through crack propagation modes (opening, in-plane shear, or out-of-plane shear) [43], as we will describe in the following section.…”

Section: Resultsmentioning

confidence: 99%

Failure Analysis of a Humeral Shaft Locking Compression Plate—Surface Investigation and Simulation by Finite Element Method

et al. 2019

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A case study of a failed humeral shaft locking compression plate is presented, starting with a clinical case where failure occurred and an implant replacement was required. This study uses finite element method (FEM) in order to determine the failure modes for the clinical case. Four loading scenarios that simulate daily life activities were considered for determining the stress distribution in a humeral shaft locking compression plate (LCP). Referring to the simulation results, the failure analysis was performed on the explant. Using fracture surface investigation methods, stereomicroscopy and scanning electron microscopy (SEM), a mixed mode failure was determined. An initial fatigue failure occurred followed by a sudden failure of the plate implant as a consequence of patient’s fall. The fracture morphology was mostly masked by galling; the fractured components were in a sliding contact. Using information from simulations, the loading was inferred and correlated with fracture site and surface features.

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Section: Resultsmentioning

confidence: 99%

Failure Analysis of a Humeral Shaft Locking Compression Plate—Surface Investigation and Simulation by Finite Element Method

et al. 2019

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“…Fatigue failure can be also studied following the fracture mechanics analysis 45,46 . The fatigue limit, in our opinion, can be considered as the extreme border of the thermoelastic before the crack nucleation, well detected by the fracture mechanics.…”

Section: Introductionmentioning

confidence: 99%

Energetic analysis of fatigue hysteresis by thermographic and digital image correlation methodologies

Rosa

Savio

Giudice

et al. 2020

Fatigue Fract Eng Mat Struct

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A hysteresis cycle can define the variation in mechanical characteristics of fatigue life and failure response. Traditional analysis is performed using forcedisplacement signals derived from the testing equipment, but this approach is prone to large errors due to clearances and slips in the measuring chain. For this reason, the authors here propose a novel setup able to assess accurately the strain status of specimens by digital image correlation (DIC) and a procedure to calculate the hysteresis energy by thermographic analysis in order to measure the damping energy with precision. The results obtained by an experimental investigation on a common austenitic steel (AISI 304) highlight that the hysteresis areas defined by the DIC displacements, and those found by the testing machine outputs have substantial differences in value. The thermal variations and the areas of the hysteresis loops, both linked to the plastic energy, were also compared, showing a reliable correlation.

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“…are the matrix fundamental solutions of the homogeneous equation 26correspondingly decreasing and increasing in infinity. The algorithm of fundamental solutions  ( ) z Y derivation is described in [37], where the method of fundamental matrix equation is also indicated. According to this approach, the solution is searched as the contour integral [39,40] …”

Section: The Construction Of the Matrix Fundamental Solution System mentioning

confidence: 99%

“…The contact stresses concentrations between the plates and the layer was studied, as it can induce destruction of the engineering structure. The advances in the use of thermoelastic stress analysis for fracture mechanics assessment were reviewed in [37]. The development of techniques to determine stress intensity factor was presented, followed by the application of these techniques to fatigue crack growth.…”

Section: Introductionmentioning

confidence: 99%

An uncoupled thermoelasticity problem for a semi-infinite layer with regard of its proper weight

Fesenko

Vaysfeld²

2019

Frattura Ed Integrità Strutturale

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The exact solution of the uncoupled thermoelasticity problem for a semi-infinite elastic layer with regard to its proper weight was constructed. The originality of the proposed paper is based on reducing Lame equations to two jointly and one separately, solvable equations. It allows the application of integral transformations directly to the transformed equations of equilibrium and makes it possible to reduce the initial problem to a one-dimensional vector boundary problem. A special technique is given to calculate multiple integrals containing oscillating functions that appear during the inversion of the transforms. The character of the temperature and proper weight influence on the value of normal stress on the lateral face of the semi-infinite layer, the zone of tensile stress depending on the shapes of the distributed load section and the temperature and Poisson's ratio is established. The parameters of dimensionless mechanical load and temperature, when the separation of the side wall of the semi-infinite layer can be eliminated, were established. A study of the influence of the layer's proper weight on the stress emerging on the layer's edge is conducted. The constructed exact solution can be used as a model for solving a similar class of problems by numerical methods.

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A review of using thermoelasticity for structural integrity assessment

Cited by 3 publications

References 15 publications

Failure Analysis of a Humeral Shaft Locking Compression Plate—Surface Investigation and Simulation by Finite Element Method

Failure Analysis of a Humeral Shaft Locking Compression Plate—Surface Investigation and Simulation by Finite Element Method

Energetic analysis of fatigue hysteresis by thermographic and digital image correlation methodologies

An uncoupled thermoelasticity problem for a semi-infinite layer with regard of its proper weight

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