Fatigue Hardening of CuZn Alloys

Lukáš, P.; Klesnil, M.

doi:10.1002/pssb.19670210233

Cited by 28 publications

(1 citation statement)

References 14 publications

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“…so-called "high cycle" area, its value does not exceed the value n = 0.23, and in the so-called "low cycle" area, the value n = 0.18 is below the breakpoint, the exponent value oscillates around n = 0.5 [12][13][14][15]. The same non-continuity was, as expected, confirmed also in the measurement of the energy absorbed in one loading cycle, depending on the stress amplitude (see Fig.…”

Section: Problem Analysismentioning

confidence: 99%

Cyclic anelasticity of metals

CHMELKO¹

2021

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The mechanics of a solid body is based on Hooke's law. The non-linearity of the stress-strain curve in cyclic loading begins at much lower stress values than at the static yield stress point. A sensitive measurement of hysteresis loops led to discovering the anelastic strain processes below the yield stress and also below the fatigue limit. In this paper, the anelasticity limit is defined -the limit between reversible and irreversible strains -which is in compliance with the fatigue damage cumulation.K e y w o r d s : anelasticity, cyclic strain, fatigue

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Section: Problem Analysismentioning

confidence: 99%

Cyclic anelasticity of metals

CHMELKO¹

2021

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Dislocations in α-Brass single crystals fatigued at low stress amplitude

Youssef

1970

Phys. Stat. Sol. (a)

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Dislocation substructures of push-pull low-stress-fatigued a-brasses of different zinc contents were studied by transmission electron microscopy of thin foils parallel and perpendicular to tJhe slip plane. The general tendency of dislocations in pure copper is to form band structures. This tendency decreases with increasing zinc content. In Cu-30% Zn the dislocation structures consist of pile-ups plus a limited number of stacking faults which are observed on (111) planes. Both short-range and long-range stress fields are responsible for fatigue-hardening. The contribution of long-range stress fields to the total hardening decreases with increasing zinc content. All dislocation structures and mechanical properties confirm the strong influence of the stacking fault energy in the course of fatigue-hardening. Versetzungs-Subst.rukturen von a-Messing mit verschiedencm Zinkgehalt wurden nach schwacher Gegentakt-Ermudungsbelastung mittels Transmissions-Elektronenmikroskopie an diinnen Schichten parallel und senkrecht zur Gleitebene nntersucht. Jm allgemeinon bilden die Versetznngen in reinem Kupfer Randerstrukturen. Diese Tendznz nimmt mit steigendem Zinkgehalt ab. In einer Cu-301', Zn-Legierung bestehen die Versetzungsstrukturen aus Anfstapelungen und eincr begrenzten Zahl von Stapelfehlern, die auf (111)-Ebenen beobachtet wurden. Sowohl kurzreichweitige als auch langrzichweitige Spannungsfefder sind fur die Ermudungsverfestigung vcrantwortlich. ner Beitrag der fangreichweitigen Spannungsfelder auf die Gesamtverfestigung nimmt mit steigendem Zinkgehalt ab. Alle Versetzungstrukturen und mechanischrn Eigenscha€ten bestiitigen den groOen EinfluO der Stapelfehlerenergie im Verlauf der Ermudungsverfestigung.

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Yield points during cyclic strain of a Cu–7.5% al alloy

Thompson

1974

Phys. Stat. Sol. (a)

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Constant strain amplitude cycling (Δϵp = 0.00275) of Cu–7.5% Al specimens causes development of a yield plateau after five cycles and an increasing yield drop thereafter. Several features are consistent with the known re‐loading yield point behavior of f.c.c. metals, such as a linear relation between yield drop and flow stress. The magnitude of the drop is time‐independent for times below 1000 s. It is suggested that the dislocation rearrangements responsible for the yield point might include dipole formation during unloading, a behavior consistent with the fatigue literature and other considerations.

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Fatigue Hardening of CuZn Alloys

Cited by 28 publications

References 14 publications

Cyclic anelasticity of metals

Cyclic anelasticity of metals

Dislocations in α-Brass single crystals fatigued at low stress amplitude

Yield points during cyclic strain of a Cu–7.5% al alloy

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