The “Size‐effect” on the Fatigue and Fracture Properties of Thin Metallic Foils

Hadrboletz, A.; Khatibi, Golta; Weiß, B.

doi:10.1002/3527607420.ch72

Cited by 13 publications

(39 citation statements)

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“…This phenomenon has been interpreted at the light of brittle or quasi-brittle fracture models in [2][3][4][5], consistently with the smaller rupture strain and meaningful reduction of toughness exhibited by free-standing thin metal foils compared to the corresponding bulk materials [6,7]. However, fractographical examinations reported in [8] suggest that the material separation may be rather produced by necking, in other words, by a typical elastic-plastic phenomenon.…”

Section: Figure 1 Typical Composition and Functionality Of Beverage supporting

confidence: 56%

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Aluminum Laminates in Beverage Packaging: Models and Experiences

et al. 2015

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Aluminum laminates are among the main components of beverage packaging. These layered material systems are coupled to paperboard plies except in the cap opening area, where the human force limit sets a requirement on the material properties to allow open-ability and the mechanical characteristics are of particular interest. Experimental investigations have been carried out on this composite and on its components by either traditional or full-field measurement techniques. The interpretation of the collected data has been supported by the simulation of the performed tests considering either a homogenized material model or the individual laminate layers. However, different results may be recovered from similar samples due to physical factors like the material processing route and the embedded defectiveness. In turn, the conclusions may vary depending on the model assumptions. This contribution focuses on the physical effects and on the modeling of the large localized deformation induced by material singularities. This topic is discussed at the light of some experimental results.

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Section: Figure 1 Typical Composition and Functionality Of Beverage supporting

confidence: 56%

“…A paperboard ply (2 in the sketch) confers the main stiffness and strength to this material system, while a thin aluminum foil (4) prevents light and oxygen penetration and natural or artificial polymer layers (1,3,5,6) act as a barrier toward moisture and work as adhesives [1].…”

Section: Introductionmentioning

confidence: 99%

Aluminum Laminates in Beverage Packaging: Models and Experiences

et al. 2015

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“…In the literature accurate analyses on the actual process zone in welded joints under static loading have been reported by Lin et al (1999), who investigated the crack growth in a mis-matched single edge notched specimen under pure bending by means of a cohesive zone model. Under fatigue loading, the influence of plastic zone and plastic strain gradients were carefully analysed by Hadrboletz et al (2001) in order to explain crack growth features from material defects.…”

Section: Value Of the Materials Parameter R C For Steel Welded Structuresmentioning

confidence: 99%

Fatigue strength of steel and aluminium welded joints based on generalised stress intensity factors and local strain energy values

2005

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Weld bead geometry cannot, by its nature, be precisely defined. Parameters such as bead shape and toe radius vary from joint to joint even in well-controlled manufacturing operations. In the present paper the weld toe region is modelled as a sharp, zero radius, V-shaped notch and the intensity of asymptotic stress distributions obeying Williams' solution are quantified by means of the Notch Stress Intensity Factors (NSIFs). When the constancy of the angle included between weld flanks and main plates is assured and the angle is large enough to make mode II contribution non-singular, mode I NSIF can be directly used to summarise the fatigue strength of welded joints having very different geometry. By using a large amount of experimental data taken from the literature and related to a V-notch angle of 135 degrees, two NSIF-based bands are reported for steel and aluminium welded joints under a nominal load ratio about equal to zero. A third band is reported for steel welded joints with failures originated from the weld roots, where the lack of penetration zone is treated as a crack-like notch and units for NSIFs are the same as conventional SIF used in LEFM. Afterwards, in order to overcome the problem related to the variability of the V-notch opening angle, the synthesis is made by simply using a scalar quantity, i.e. the mean value of the strain energy averaged in the structural volume surrounding the notch tips. This energy is given in closed form on the basis of the relevant NSIFs for modes I and II and the radius R-c of the averaging zone is carefully identified with reference to conventional arc welding processes. Rc for welded joints made of steel and aluminium considered here is 0.28mm and 0.12mm, respectively Different values of Rc might characterise welded joints obtained from high-power processes, in particular from automated laser beam welding. The local-energy based criterion is applied to steel welded joints under prevailing mode I (with failures both at the weld root and toe) and to aluminium welded joints under mode I and mixed load modes (with mode II contribution prevailing on that ascribable to mode I). Surprising, the mean value of Delta W related to the two groups of welded materials was found practically coincident at 2 million cycles. More than 750 fatigue data have been considered in the analyses reported herein

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“…Thin sheet metals are employed as structural parts in automotive design [1,2], aerospace components [2] and more recently in micro systems [3,4]. This is attributed to their high strength, light weight, low cost and the ease of fabricating intricate sheet metal parts [2].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, stainless steel is being considered as a candidate material for biomedical implants [4]. In applications such as abrasion strips for helicopter rotor blades [6], circular cup casing for a micro vibration motor [7], buses, trains [5] and other micro or biomedical devices [3,4] the structural thin sheet components experience cyclically varying loads that subject them to fatigue.…”

Section: Introductionmentioning

confidence: 99%