Publication detail

On the Mechanism of Factory-Roof Formation

POKLUDA, J. SLÁMEČKA, K. ŠANDERA, P.

Original Title

On the Mechanism of Factory-Roof Formation

Type

conference paper

Language

English

Original Abstract

The investigated factory-roof (F-R) patterns were produced by cyclic torsion loading of V-notched cylindrical specimens made of the high-strength low-alloy steel. A three-dimensional model of the F-R pattern was constructed by means of the stereophotogrammetry. This allowed us to recognize the geometrical proportions as well as to understand the basic geometrical rules of its formation. The theoretical analysis revealed that the F-R initiates by elementary mode I branches at the front of semi-elliptical surface cracks. The exact positions of such branches can be analytically determined in terms of the maximum synergy of mode II and mode III loadings. An increasing density of semi-elliptical cracks initiated on the surface results in the refinement and the size reduction of F-R patterns. This effect can, together with strong wear damage, explain the fact that the F-R patterns are usually not observed in the low-cycle fatigue region.

Keywords

factory roofs; fatigue; torsion; V-notch

Authors

POKLUDA, J.; SLÁMEČKA, K.; ŠANDERA, P.

RIV year

2009

Released

1. 10. 2009

Publisher

University of Parma

Location

Vicenza, Italy

ISBN

0000000000000

Book

Crack Paths

Pages from

155

Pages to

166

Pages count

12

BibTex

@inproceedings{BUT30037,
  author="Jaroslav {Pokluda} and Karel {Slámečka} and Pavel {Šandera}",
  title="On the Mechanism of Factory-Roof Formation",
  booktitle="Crack Paths",
  year="2009",
  pages="155--166",
  publisher="University of Parma",
  address="Vicenza, Italy",
  isbn="0000000000000"
}