Application of infrared thermography to study crack growth and fatigue life extension procedures

Jones, Rhys; Krishnapillai, Mukunthan; Cairns, Kenneth; Matthews, Neil

doi:10.1111/j.1460-2695.2010.01505.x

Cited by 38 publications

(15 citation statements)

References 46 publications

(107 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, improved fatigue properties are obtained if low porosity, high adhesion strength and enough surface compressive residual stresses characterize the coldsprayed coatings reducing the incoming of crack initiation especially at the coating-substrate interphases (Ref 10). Very limited experimental evidence has been presented in the literature on crack initiation and growth behavior of cold spray coatings; this lack of evidence does not allow conclusive results ( Ref 11,12). The present paper is aimed to present systematic results of crack repairing of Ni-based superalloys through cold spray.…”

Section: Introductionmentioning

confidence: 92%

Crack Initiation and Growth Behavior of Cold-Sprayed Ni Particles on IN718 Alloy

Cavaliere

Silvello

2017

J. of Materi Eng and Perform

View full text Add to dashboard Cite

Cold spray processing parameters, governing particle velocity and impact energy, are analyzed in the present paper for pure Ni sprayed on IN718 substrates. Finite element modeling (FEM) was used to calculate the particle impact velocity and temperature as a function of gas temperature and pressure and particle density and dimensions. Experimental evidence underlines the possibility of performing repairing through cold spray thanks to the good level of adhesion achievable by employing optimal combinations of materials and spray processing parameters. In the present paper, the potential repairing of cracked superalloys sheets, by employing cold spray technology, is presented. 30°surface V-notched IN718 panels have been repaired by using pure Ni cold-sprayed powders. The bending behavior of the repaired sheets was analyzed by FEM and mechanical testing in order to compare the properties with those belonging to the unrepaired panels. Simulations and mechanical results showed a reduction in the stress intensity factor, a modification of the crack initiation site and a crack retardation in the repaired structures if compared with the unrepaired ones. The K factor was quantified; the resistance of repaired panels was increased of more than eight times in the case of repairing with Ni cold spray particles. Geometrical and mechanical properties of the coating-substrate interfaces, such as adhesion strength and residual stresses influencing the coatings behavior, were largely analyzed.

show abstract

Section: Introductionmentioning

confidence: 92%

Crack Initiation and Growth Behavior of Cold-Sprayed Ni Particles on IN718 Alloy

Cavaliere

Silvello

2017

J. of Materi Eng and Perform

View full text Add to dashboard Cite

show abstract

“…The linking from multiple repairs in the Aloha, from (1) . non-contact method within a shorter period, and thus users can obtain stress maps immediately after the test (10) .…”

Section: Introductionmentioning

confidence: 99%

Additive metal solutions to aircraft skin corrosion

Matthews¹,

Jones²,

Peng³

et al. 2020

Aeronaut. j.

Self Cite

View full text Add to dashboard Cite

ABSTRACTThis paper focuses on the problem of skin corrosion on the upper wing surfaces of rib-stiffened aircraft. For maritime and military transport aircraft this often results in multiple co-located repairs. The common approach to corrosion damage in operational aircraft is to blend out the corrosion and rivet a mechanical doubler over the region. In particular this paper describes the results of a combined numerical and experimental investigation into the ability of the additive metal technology, Supersonic Particle Deposition (SPD), to restore the load-carrying capacity of rib-stiffened wing planks with simulated skin corrosion. The experimental results reveal that unrepaired skin corrosion can result in failure by yielding. The experimental results also reveal that SPD repairs to skin corrosion can restore the stress field in the structure, and can ensure that the load-carrying capability of the repaired structure is above proof load.

show abstract

“…The temperature increase of a metallic material undergoing a fatigue test is a manifestation of the thermal energy dissipation. Therefore, in the last decades; temperature has been used for the rapid estimation of fatigue limit in metallic materials and components [1][2][3][4] , the detection and propagation of damage in metal materials and composites in [5][6][7][8] and the investigation of fatigue life under constant amplitude [9][10][11] and block loading [12,13]. Nevertheless, since temperature depends on the mechanical and thermal boundary conditions, the specific heat energy per cycle, Q, was assumed as a fatigue damage indicator in [14], because it is expected to be a material property, similarly to the plastic strain hysteresis energy [15,16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of dissipated energy and temperature fields at severe notches of AISI 304L stainless steel specimens

Rigon

Ricotta

Meneghetti

2018

Frattura Ed Integrità Strutturale

View full text Add to dashboard Cite

In the last years, a large amount of fatigue test results from plain and bluntly notched specimens made of AISI 304L stainless steel were synthetized in a single scatter band by adopting the specific heat loss per cycle (Q) as a damage parameter. During a fatigue test, the Q parameter can be evaluated measuring the cooling gradient at a point of the specimens after having suddenly stopped the fatigue test. This measurement can be done by using thermocouples; however, due to the high stress concentration at the tip of severely notched components analysed in the present paper, an infrared camera achieving a much improved spatial resolution was adopted. A data processing technique is presented to investigate the heat energy distribution close to the notch tip of hot-rolled AISI 304L stainless steel specimens, having notch tip radii equal to 3, 1 and 0.5 mm and subjected to constant amplitude cyclic loads. A thermal finite element analysis was also performed by assigning heat generation in the appropriate region close to the notch tip. Then the numerical temperature values were compared with the experimental measurement.

show abstract

Application of infrared thermography to study crack growth and fatigue life extension procedures

Cited by 38 publications

References 46 publications

Crack Initiation and Growth Behavior of Cold-Sprayed Ni Particles on IN718 Alloy

Crack Initiation and Growth Behavior of Cold-Sprayed Ni Particles on IN718 Alloy

Additive metal solutions to aircraft skin corrosion

Analysis of dissipated energy and temperature fields at severe notches of AISI 304L stainless steel specimens

Contact Info

Product

Resources

About