---
_id: '66673'
abstract:
- lang: eng
  text: <jats:p>Investigating crack growth in sheet metal originating from clinched
    joints is a major part of predicting the service life of mechanically joined structures.
    Clinching allows different materials to be joined together. A key task in this
    context is to perform crack growth simulations in the vicinity of clinched joints
    considering different load and environmental conditions. This requires formulaic
    descriptions of the fatigue crack growth rate curves for the materials used. For
    this purpose, fatigue crack growth rate curves for different R-ratios and temperatures
    are determined experimentally. Generally, these fatigue crack growth rate curves
    can be described very well using a novel two-part exponential approach for the
    formulaic description of fatigue crack growth rate curves developed at Applied
    Mechanics of Paderborn University (FAM). In this case, three parameters are sufficient
    to describe the fatigue crack growth rate curves. For the material HCT590X, which
    is frequently used in clinched joints, it is shown as an example how the parameters
    vary with the R-ratio and the temperature. In addition, at high crack growth rates,
    a significant rise in the fatigue crack growth rate curve sometimes occurs at
    both low and high temperatures. To account for this feature, the two-part exponential
    approach can be expanded to include a third part.</jats:p>
article_number: '835'
author:
- first_name: Gunter
  full_name: Kullmer, Gunter
  id: '291'
  last_name: Kullmer
- first_name: Sven
  full_name: Krome, Sven
  id: '57245'
  last_name: Krome
- first_name: Deborah
  full_name: Weiß, Deborah
  id: '45673'
  last_name: Weiß
- first_name: Britta
  full_name: Schramm, Britta
  id: '4668'
  last_name: Schramm
- first_name: Richard
  full_name: Ostwald, Richard
  id: '106876'
  last_name: Ostwald
  orcid: 0000-0003-2147-8444
citation:
  ama: Kullmer G, Krome S, Weiß D, Schramm B, Ostwald R. Influence of the R-Ratio
    and the Temperature on the Coefficients of a Novel Exponential Approach for the
    Formulaic Description of Fatigue Crack Growth Rate Curves. <i>Metals</i>. 2026;16(8).
    doi:<a href="https://doi.org/10.3390/met16080835">10.3390/met16080835</a>
  apa: Kullmer, G., Krome, S., Weiß, D., Schramm, B., &#38; Ostwald, R. (2026). Influence
    of the R-Ratio and the Temperature on the Coefficients of a Novel Exponential
    Approach for the Formulaic Description of Fatigue Crack Growth Rate Curves. <i>Metals</i>,
    <i>16</i>(8), Article 835. <a href="https://doi.org/10.3390/met16080835">https://doi.org/10.3390/met16080835</a>
  bibtex: '@article{Kullmer_Krome_Weiß_Schramm_Ostwald_2026, title={Influence of the
    R-Ratio and the Temperature on the Coefficients of a Novel Exponential Approach
    for the Formulaic Description of Fatigue Crack Growth Rate Curves}, volume={16},
    DOI={<a href="https://doi.org/10.3390/met16080835">10.3390/met16080835</a>}, number={8835},
    journal={Metals}, publisher={MDPI AG}, author={Kullmer, Gunter and Krome, Sven
    and Weiß, Deborah and Schramm, Britta and Ostwald, Richard}, year={2026} }'
  chicago: Kullmer, Gunter, Sven Krome, Deborah Weiß, Britta Schramm, and Richard
    Ostwald. “Influence of the R-Ratio and the Temperature on the Coefficients of
    a Novel Exponential Approach for the Formulaic Description of Fatigue Crack Growth
    Rate Curves.” <i>Metals</i> 16, no. 8 (2026). <a href="https://doi.org/10.3390/met16080835">https://doi.org/10.3390/met16080835</a>.
  ieee: 'G. Kullmer, S. Krome, D. Weiß, B. Schramm, and R. Ostwald, “Influence of
    the R-Ratio and the Temperature on the Coefficients of a Novel Exponential Approach
    for the Formulaic Description of Fatigue Crack Growth Rate Curves,” <i>Metals</i>,
    vol. 16, no. 8, Art. no. 835, 2026, doi: <a href="https://doi.org/10.3390/met16080835">10.3390/met16080835</a>.'
  mla: Kullmer, Gunter, et al. “Influence of the R-Ratio and the Temperature on the
    Coefficients of a Novel Exponential Approach for the Formulaic Description of
    Fatigue Crack Growth Rate Curves.” <i>Metals</i>, vol. 16, no. 8, 835, MDPI AG,
    2026, doi:<a href="https://doi.org/10.3390/met16080835">10.3390/met16080835</a>.
  short: G. Kullmer, S. Krome, D. Weiß, B. Schramm, R. Ostwald, Metals 16 (2026).
date_created: 2026-08-06T10:14:38Z
date_updated: 2026-08-06T10:17:54Z
department:
- _id: '9'
- _id: '952'
- _id: '321'
doi: 10.3390/met16080835
intvolume: '        16'
issue: '8'
language:
- iso: eng
project:
- _id: '132'
  name: TRR 285 - Project Area B
- _id: '143'
  name: TRR 285 - Subproject B04
- _id: '130'
  name: 'TRR 285:  Methodenentwicklung zur mechanischen Fügbarkeit in wandlungsfähigen
    Prozessketten'
publication: Metals
publication_identifier:
  issn:
  - 2075-4701
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Influence of the R-Ratio and the Temperature on the Coefficients of a Novel
  Exponential Approach for the Formulaic Description of Fatigue Crack Growth Rate
  Curves
type: journal_article
user_id: '85414'
volume: 16
year: '2026'
...