The energy dissipation during fatigue crack growth in metallic materials

H. Quan; R. C. Alderliesten

doi:10.1016/j.engfracmech.2022.108567

The energy dissipation during fatigue crack growth in metallic materials

H. Quan^*, R. C. Alderliesten

^*Corresponding author for this work

Structural Integrity & Composites

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Abstract

An energy equation for fatigue crack growth was proposed. It equates the total external work per cycle (dW/dN) to the sum of plastic dissipation (dU_pl/dN), change in strain energy stored (dU_e/dN) and the energy dissipated in new crack surface formation (dU_a/dN). Fatigue crack growth experiment of 7075-T6 was used to derive the relation between fatigue crack growth rate (da/dN) and variables in this equation. The result shows dU_pl/dN and dU_e/dN are not straightforwardly related to da/dN. The dU_a/dN, whose value cannot be obtained sufficiently precise experimentally, can be the variable straightforwardly related to da/dN within the range of test.

Original language	English
Article number	108567
Number of pages	15
Journal	Engineering Fracture Mechanics
Volume	269
DOIs	https://doi.org/10.1016/j.engfracmech.2022.108567
Publication status	Published - 2022

Keywords

7075-T6
Energy dissipation
Fatigue crack growth

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10.1016/j.engfracmech.2022.108567

1-s2.0-S0013794422003022-mainFinal published version, 3.83 MBLicence: CC BY

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title = "The energy dissipation during fatigue crack growth in metallic materials",

abstract = "An energy equation for fatigue crack growth was proposed. It equates the total external work per cycle (dW/dN) to the sum of plastic dissipation (dUpl/dN), change in strain energy stored (dUe/dN) and the energy dissipated in new crack surface formation (dUa/dN). Fatigue crack growth experiment of 7075-T6 was used to derive the relation between fatigue crack growth rate (da/dN) and variables in this equation. The result shows dUpl/dN and dUe/dN are not straightforwardly related to da/dN. The dUa/dN, whose value cannot be obtained sufficiently precise experimentally, can be the variable straightforwardly related to da/dN within the range of test.",

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language = "English",

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T1 - The energy dissipation during fatigue crack growth in metallic materials

AU - Quan, H.

AU - Alderliesten, R. C.

PY - 2022

Y1 - 2022

N2 - An energy equation for fatigue crack growth was proposed. It equates the total external work per cycle (dW/dN) to the sum of plastic dissipation (dUpl/dN), change in strain energy stored (dUe/dN) and the energy dissipated in new crack surface formation (dUa/dN). Fatigue crack growth experiment of 7075-T6 was used to derive the relation between fatigue crack growth rate (da/dN) and variables in this equation. The result shows dUpl/dN and dUe/dN are not straightforwardly related to da/dN. The dUa/dN, whose value cannot be obtained sufficiently precise experimentally, can be the variable straightforwardly related to da/dN within the range of test.

AB - An energy equation for fatigue crack growth was proposed. It equates the total external work per cycle (dW/dN) to the sum of plastic dissipation (dUpl/dN), change in strain energy stored (dUe/dN) and the energy dissipated in new crack surface formation (dUa/dN). Fatigue crack growth experiment of 7075-T6 was used to derive the relation between fatigue crack growth rate (da/dN) and variables in this equation. The result shows dUpl/dN and dUe/dN are not straightforwardly related to da/dN. The dUa/dN, whose value cannot be obtained sufficiently precise experimentally, can be the variable straightforwardly related to da/dN within the range of test.

KW - 7075-T6

KW - Energy dissipation

KW - Fatigue crack growth

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DO - 10.1016/j.engfracmech.2022.108567

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VL - 269

JO - Engineering Fracture Mechanics

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The energy dissipation during fatigue crack growth in metallic materials

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